Francis heard that a car stereo system was on sale for 30% off. If the sale price was 57.75, what was the original price of the stereo?
Answers
We can calculate it with a direct rule of 3. As it has a 30% off, the remaining price is the 70% and we want to know how much 100% is.
We use the formula of the direct rule of 3 to give us
x = 82.5
The original price of the stereo was $82.50!
Answer:
$82.50
Step-by-step explanation:
82.5 times 0.7 = 57.75
doing 57.75 + 30% wouldn't work, so you have to increase the number (original price) being discounted until you get 57.75
also, the '0.7' is 70% which also means '30% off' because you took 30% away from the original price that was 100%
math calculator saves the day? dont use paper or it would take a long time (unless it was a test or teacher said no)
Related Questions
Please help I have no idea
Answers
help a sister out with a polynomial and quadratic functions question
Answers
Answer:
when you multiply the exponents, you add the numbers
so it'll now be y^5
Write the following inequality in s
19x + y ≤ -11
Write your answer with y first, fo
fractions, and improper fractions
Answers
The inequality in slope intercept form is –y≥19x+11
What is slope intercept?
Slope intercept form is defined as the graph of linear equation y=mx+b where m and b as the y-intercept.
What is inequality?
Inequality is an equation that is used to show the non equal comparison of two or more numbers and variables.
Given inequality is 19x+y≤-11
To solve this inequality in y form, we will subtract 19x from both side, we get
y≤-11-19x
Now, we will take minus sign common,
-y≥19x+11
Hence, the required answer.
To know more about inequality and slope intercept form, visit:
https://brainly.com/question/16914953
https://brainly.com/question/306928
#SPJ9
Create a hand drawn sketch of the quadratic function: h(x)= -2x^2 +5x-8To earn full credit be sure to identify the vertex, the axis of symmetry and all intercepts. Include all work, calculations and steps needed (as described in this lesson) to create the graph.Let your teacher know if you have any questions on how to upload or share your written work.
Answers
Hello!
We have the function below:
[tex]h\mleft(x\mright)=-2x^2+5x-8[/tex]The first step is to identify the coefficients a, b and c:
• a = -2
,• b = 5
,• c = -8
Just by analyzing these coefficients, we can say that the concavity of the parabola will be facing downwards because the coefficient a is negative
1st step: using the quadratic formula, we will find the interceptions in the x-axis. Look:[tex]x=\frac{-b\pm\sqrt[]{b^2-4\cdot a\cdot c}}{2\cdot a}[/tex]As we know the coefficients, let's replace them in the formula:
[tex]\begin{gathered} x=\frac{-5\pm\sqrt[]{5^2-4\cdot(-2)\cdot(-8)}}{2\cdot(-2)} \\ \\ x=\frac{-5\pm\sqrt[]{25^{}-64}}{-4}=\frac{-5\pm\sqrt[]{-39}}{-4}= \end{gathered}[/tex]Obs: as we obtained a negative square root, we can stop this step here. It means that
2nd step: let's identify the maximum point of it:[tex]\begin{gathered} x_V=\frac{-b}{2\cdot a}=\frac{-5}{2\cdot(-2)}=\frac{-5}{-4}=1.25 \\ \\ y_V=-\frac{b^2-4\cdot a\cdot c}{4\cdot a}=-\frac{5^2-4\cdot(-2)\cdot(-8)}{4\cdot(-2)}=-\frac{-39}{-8}=-4.875 \end{gathered}[/tex]So, the vertex is at the point (x, y) = (1.25, -4.875).
The axis of symmetry is x = 5/4 or also x = 1.25.
Look at the graph below:
Note: if you solve this function when x = 0, you will obtain one interception in the y-axis, look:
[tex]\begin{gathered} h\mleft(x\mright)=-2x^2+5x-8 \\ h\mleft(0\mright)=-2\cdot0^2+5\cdot0-8 \\ h(0)=0+0-8 \\ h(0)=-8 \end{gathered}[/tex]So, the y-intercept is at (x, y) = (0, -8) as you can see at the graph.
If the area of a rectangular sign is approximately 4260 ft. and the width is approximately 60 feet what is the height of the sign
Answers
Answer:
The height is 71 feet.
Step-by-step explanation:
[tex]60h = 4260[/tex]
[tex]h = 71[/tex]
If the area of a rectangular sign is approximately 4260 square feet and the width of the sign is approximately 60 feet then, the height of the sign is approximately 71 feet.
To find the height of the given rectangular sign, let's put the given values in the formula for finding the area of a rectangle i.e.,
Area of rectangle = Height x Width
4260 = Height x 60
Solve the equation for the area of a rectangle where
Height (H) = Area of rectangle/Width
Height (H) = 4260/60
Height of the sign = 71 feet
Learn more about area of rectangle here:
https://brainly.com/question/20551643
Graph the equation y= −4x −3
Answers
Answer: See attached.
Step-by-step explanation:
We can look at the values given in the equation to graph it.
➜ The -3 shows the line will intercept the y-axis at -3.
➜ The equation has a slope of -4, so for everyone right we move four down.
Question 1 Describe the error in writing an equation of the line that passes through the point (3, 4) and is parallel to the line y = 2x+1. Responses The x- and y-coordinates are substituted for the wrong variables. The , x, - and , y, -coordinates are substituted for the wrong variables. The y-intercept b should be solved for instead of the slope m. The , y-intercept b should be solved for instead of the slope m, . To find m, standard form must be used instead of slope-intercept form. To find , m, standard form must be used instead of slope-intercept form. Once the new slope is found, the new y-intercept must also be found. Once the new slope is found, the new , y, -intercept must also be found. Question 2 Correct the error. The line y = is parallel to the line y = 2x+1 and passes through the point (3,4).
Answers
An error in writing an equation of the line is to use 1 as the y intercept, or to use the negative inverse of the slope which gives you a perpendicular line, not a parallel line
How to write a Line in slope Intercept form?
For a line to be parallel, it means that the line must have the same slope, but a different y-intercept because If it has the same y intercept, it means that it is the same line.
Now, we are told that the line passes through the point (3, 4) and is parallel to the line y = 2x +1. Thus;
The slope; m = 2
The coefficient of the x term, when the equation is solved for y is;
y = mx + c is the standard equation in slope intercept form with c as the y intercept
Plug in the coordinate point to solve for c;
4 = 2(3) + c
c = 4 - 6
c = -2
Thus, we conclude that the parallel line through the given point is gotten as; y = 2x - 2
Read more about Slope Intercept form at; https://brainly.com/question/1884491
#SPJ1
maths question to purely maths tutor
Answers
answer is here
some drawing:
cool
∉343
[tex]\sqrt[422\sin 242]{e}2424\begin{cases}x=24 \\ y=24242f(x)=\begin{cases}4242 \\ 4242 \\ 424224\lim _{n\to\infty}2424244224\end{cases}\end{cases}[/tex]Answer: Need a math question
Step-by-step explanation: x3+y3+z3= ?
12.03 km = _________ m ______ cm
Answers
1km = 1000 m
12.03 km = 12.03 x 1000
12.03 km = 12030 m
1km = 100000 m
12.03 km = 12.03 x 100000
12.03 km = 1203000 cm
Which of the following statements is true?
A. The diagonals of a quadrilateral are always congruent.
B. The diagonals of a parallelogram always bisect each other.
C. The diagonals of a rectangle are always perpendicular to each other.
D. The diagonals of a rhombus are always congruent and perpendicular to each other.
Answers
Solutions are in next segment
Explanation:
1. B. All four angles are congruent. (90).
2. A. Bisect.
3. B. 20.( 360/n =360/18).
4.C. all four sides are congruent.
Scale Word Problems (L1)
Oct 09, 9:51:30 AM
Watch help video
A scale drawing of a rectangur park had a scale of 1 cm = 100 m.
4.1 cm
Answer:
11.9 cm-
What is the actual area of the park in meters squared?
m²
Submit Answer
Answers
The actual area of the park when a scale drawing of the park had a scale of 1 cm = 100 m is 4879m².
How to calculate the area?From the information, the scale drawing of a rectangur park had a scale of 1 cm = 100 m.
It should be noted that the dimensions are given as 4.1 cm and 11.9cm. The area of the scale will be:
= 4.1 × 11.9
= 48.79cm²
Therefore, the actual area of the park will be:
= 48.79 × 100
= 4879m²
Learn more about area on:
brainly.com/question/25292087
#SPJ1
I need help solving this
Answers
Solution:
Given:
[tex]108,105,102,...,15[/tex]This is an arithmetic sequence because it has a common difference.
From the nth term of an arithmetic sequence,
[tex]\begin{gathered} a_n=a+(n-1)d \\ a=108 \\ d=105-108=102-105=-3 \\ a_n=15 \\ \\ Hence,\text{ the number of terms in the sequence is;} \\ 15=108+(n-1)-3 \\ 15-108=-3(n-1) \\ -93=-3(n-1) \\ \frac{-93}{-3}=n-1 \\ 31=n-1 \\ 31+1=n \\ 32=n \\ n=32 \end{gathered}[/tex]The sum of an arithmetic sequence is given by;
[tex]\begin{gathered} S_n=\frac{n}{2}(a+l) \\ \\ where: \\ first\text{ term, }a=108 \\ last\text{ term, }l=15 \\ n=32 \\ \\ Hence, \\ S_n=\frac{32}{2}(108+15) \\ S_n=16(123) \\ S_n=16\times123 \\ S_n=1968 \end{gathered}[/tex]herefore, the sum oft the sequence is 1968
A linear function passes through the points (-3.14) and (2,-1). What is the rate of change of the function?
Responses
-13
−17/3
-3
−3/17
Answers
The rate of change of the linear function is the third option that is -3.
It is given in the question that the linear function passes through the points (-3,14) and (2,-1).
We have to find the rate of change of the function.
We know that,
The rate of change of a linear function is the slope of the function.
Slope of a line
The slope of a straight line between two points says (x1,y1) and (x2,y2) can be easily determined by finding the difference between the coordinates of the points. The slope is usually represented by the letter ‘m’.
Hence, slope of a line that passes through the points (-3,14) and (2,-1) is
(-1-14)/(2-(-3)) = -15/5 = -3.
To learn more about rate of change, here:-
https://brainly.com/question/12786410
#SPJ1
Find the surface area of the sphere.r= 4 cmFormulas for SpheresS.A. = 4tr2v = frer S.A. = [?] cm2Round to the nearest tenth.Enter
Answers
The radius of sphere is r = 4 cm.
Substitute the value in the formula to determine the surface area of sphere.
[tex]\begin{gathered} SA=4\pi\cdot(4)^2 \\ =64\pi \\ =201.061 \\ \approx201.1 \end{gathered}[/tex]So answer is S.A = 201.1
A 14 (3/4) inch board is cut from a 34 (1/4) inch board. The saw cut takes (3/8) inch. How much of the 34 (1/4) inch board is left after cutting
(Type an integer, fraction, or mixed)
Answers
Integer - 19 (1/8)inch board would be left after cutting from 34(1/4) inch board
What is an Integer ?
Zero, a positive natural number, or a negative integer denoted by a minus sign are all examples of integers. The inverse additives of the equivalent positive numbers are the negative numbers. When expressed in mathematical terms,
34 (1/4) inch board = 137/4 ----(1)
Cut piece = 14 3/4 = 59/4 ----(2)
saw cut 3/8 = 3/8 --------(3)
To calculate the board which is left after cutting will be
= 137 / 4 - 59 / 4 - 3/8
= 137 - 59 / 4 - 3 / 8
= 39 / 2 - 3 / 8
= 312 - 6 / 8
= 306 / 16
= 153 / 8
or, = 19 (1/8)inch
Hence, 19(1/8)inch board will be left after cutting
To learn more about Integers click on the link
https://brainly.com/question/17695139
#SPJ9
A set of 25 two digit numbers are listed below 10,17,19.22,24,28,32,39,42,44,44,46,51,54,57,60,64,66,71,74,77,79,84,93,97,98
How can I get what is the probability of the sum of the number's digits is odd?
Answers
The probability that the sum of the number's digit is odd is 1/5.
What is the probability?
Probability is used to determine how likely it is that a random event would happen.
An odd number is a number that is not perfectly divisible by 2. Examples of odd numbers include 1, 3, 5.
Sum of the number's digits:
1 + 0 = 1 (odd number)
1 + 7 = 8
1 + 9 = 10
2 + 2 = 4
2 + 4 = 6
2 + 8 = 10
3 + 2 = 5 (odd number)
3+ 9 = 12
4 + 2 = 6
4+ 4 = 8
4 + 4 = 8
4 + 6 = 10
5 + 1 = 6
5 + 4 = 9 (odd number)
5 + 7 = 12
6 + 0 = 6
6 + 4 = 10
6 + 6 = 12
7 + 1 = 8
7 + 4 = 11 (odd number)
7 + 7 = 14
7 + 9 = 16
8 + 4 = 12
9 + 3 = 12
9 + 7 = 16
9 + 8 = 17 (odd number)
The probability that the sum of the digits is odd = number of odd digits / total number
5 / 25 = 1/5
To learn more about probability, please check: https://brainly.com/question/13234031
#SPJ1
polynomial degree 3 root of multiplicity 2 at x=1 root of multiplicity 1 at x=-2 y-intercept is y =-1.6
Answers
By using the definition of a polynomial in product form is described by y = - 0.8 · (x - 1)² · (x + 2)
How to determine a least degree polynomial
According to algebra, polynomials are products of binomials of the form x - r, where r is a root of the polynomial. The product form of polynomials is described by the following formula:
p(x) = a · Π (x - r), for i = {1, 2, 3, n}, where n is the grade of the polynomial and a is the lead coefficient.
If we know that y(0) = - 1.6, r₁ = r₂ = 1 and r₃ = - 2, then the equation of the polynomial is:
- 1.6 = a · (0 - 1)² · (0 + 2)
- 1.6 = a · (- 1)² · 2
- 1.6 = 2 · a
a = - 0.8
To learn more on polynomials of least degree: https://brainly.com/question/26854036
#SPJ1
which of the given values are in the interval (-3,1]?
Answers
The values coming in the interval (-3,1] are -2, -1, 0, and 1.
What is defined as the term interval notations?An interval is represented on a number line using interval notation. In all other sayings, it is a method of writing real number line subsets. An interval is made up of numbers that fall between two specific data set.Intervals can be categorized according to the numbers in the set.Interval Open: The endpoints of a inequality are not included in this type of interval.Interval Closure; The endpoints of a inequality are included in this type of interval.Interval with Half-Open Doors: This interval contains only one of inequality's endpoints.The given interval notation is;
(-3,1], it is the case of half open half close.
-3 comes with the open interval, it means its value will not be included in the interval.
1 is with the closed interval, it means its value will be included in the interval.
Thus, the values lying between the interval (-3, 1] are -2, -1, 0, and 1.
To know more about the interval notations, here
https://brainly.com/question/16768997
#SPJ10
Which pair of complex numbers has a real-number product?
Answers
The product of (1 + 3i)(1 – 3i) is a real number.
What is a complex number?Complex Numbers in Math. Complex numbers are the numbers that are expressed in the form of a+ib where, a, b are real numbers and 'i' is an imaginary number called “iota”. The value of i = (√-1). For example, 2+3i is a complex number, where 2 is a real number (Re) and 3i is an imaginary number (Im).
We know that,
[tex]i^{2} = -1[/tex]
case A) [tex](1+3i)(6i)[/tex]
applying distributive property
[tex]6i+18i^{2}[/tex]
[tex]6i-18[/tex]
This is not a real number.
case B) (1+3i) (2-3i)
applying distributive property
[tex]2-3i+6i-9i^{2}[/tex]
[tex]11+3i[/tex]
This is also not a real number.
case C) [tex](1+3i) (1-3i)[/tex]
applying difference of square
[tex]1-9i^{2}[/tex]
1+9 = 10
This is a real number.
case D) [tex](1+3i) (3i)[/tex]
applying distributive property
[tex]3i+9i^{2}[/tex]
[tex]3i-9[/tex]
This is not a real number.
Hence, The product of (1 + 3i)(1 – 3i) is a real number
To learn more about complex number from the given link:
https://brainly.com/question/1401604
#SPJ9
Which of the following IS a function?
Answers
A function connects an input to an output. It is analogous to a machine with an input and an output. And the output is somehow related to the input.
Option c is Example for the function.
Is all relation a function?The relationship depicts the connection between INPUT and OUTPUT. A function, on the other hand, is a relation that produces one OUTPUT for each given INPUT. It should be noted that all functions are relations, but not all relations are functions.A function has at least two variables: one for output and one or more for input. An equation expresses the equality of two expressions and can include any number of variables (none, one, or more). A function is frequently expressed as an equation, but not every equation is a function.
To learn more about : function.
Ref : https://brainly.com/question/20384115
#SPJ13
I’m confused on this and don’t know what to do
Answers
Answer:29
Step-by-step explanation:
3(3)^3+2(4)-6
3(9)+8-6
27+8-6
27+2
29
At a factory, there are 40 new cars produced every 8 hours. How many cars can be produced in a 40-hour week?
Answers
Answer:
200
Step-by-step explanation:
Multiplying by 5, we get 200 cars can be produced in 40 hours.
Zeke learned that he could make another
$2,000 a year if he became fluent in Spanish.
If he intends to learn the language and work another 10 years at that job, how much is learning Spanish worth to him?
Answers
If Zeke learned that he could earn another $2000 a year if he become fluent in Spanish and he intended to learn the language and work another 10 years at that job, then the amount is learning Spanish worth to him is $20000
The extra amount he could make if he learn Spanish = $2000
The number of years he works = 10 years
To find the extra amount, we have to use multiplication
The extra amount he could make if he learn Spanish = The extra amount he could make if he learn Spanish × The number of years he works
Substitute the values in the equation
= 2000×10
Multiply it
= $20000
Hence, if Zeke learned that he could make another $2000 a year if he become fluent in Spanish and he intended to learn the language and work another 10 years at that job, then the amount is learning Spanish worth to him is $20000
Learn more about multiplication here
brainly.com/question/14667283
#SPJ1
PLS ANSWER THIS MATH PROBLEM!!
Answers
Answer:
See picture
Step-by-step explanation:
I opened a grocery account at my bank with $150. Every week thereafter, I withdraw $55 from the account to pay for groceries.
If x is the number of weeks I've had the account, then y is the amount in the account.
Find an equation of a line in the form y = mx + b that describes my grocery account balance.
y=
Answers
If he opened a grocery account at my bank with $150 and every week thereafter he withdraw $55 from the account to pay for groceries, then the equation of the line in the form y = mx+b that describes the grocery account balance is y = -55x+150
The balance in the bank account = $150
The amount he withdraw from the account for groceries = $55
Consider the number of week he had the account as x
y is the amount in the account
Then the equation will be
y = 150-55x
Rearrange the term and make the equation in the form y = mx+b
y = -55x+150
Hence, If he opened a grocery account at my bank with $150 and every week thereafter he withdraw $55 from the account to pay for groceries, then the equation of the line in the form y = mx+b that describes the grocery account balance is y = -55x+150
Learn more about equation of the line here
brainly.com/question/21511618
#SPJ1
Find domain and range
Answers
D={-2, -1, 0, 2}
R={-2, -1, 2, 3}
I attached a photo to answer you question. Hope this helps!
Two numbers are respectively twenty percent and ten percent more than a third number. How
much percent is the first number more than the second?
Answers
The first number is 8.33 percent more than the second number.
Let m be the first number, n be the second number and p be the third number.
Two numbers are respectively twenty percent and ten percent more than a third number.
m = (100 + 20)% of p
m = 120 percent of p
m = 120 % of p
m = (120 / 100) × p
m = 1.2 p
And the second number would be,
n = (100 + 10)% of p
n = 110 percent of p
n = (110 / 100) × p
n = 1.1 p
We need to find by how much number the first number more than the second.
Consider the difference,
1.2 p - 1.1p = 0.1 p
So the required percentage noting but the difference is what percent of the first number.
(0.1 p / 1.2 p) × 100 = 8.33%
Therefore, the first number is 8.33 percent more than the second number.
Learn more about the percentage here:
https://brainly.com/question/16797504
#SPJ1
Simplify fully 24a^2 + 8a
Answers
Answer:
8a(3a + 1)
Step-by-step explanation:
24a² + 8a
8a(3a + 1)
I hope this helps!
What is the rule for the pattern 1, 4, 7, 10,...?
A) Add 10
B) Multiply by 4
C) Add 3
D) Subtract 3
Answers
Answer:
C
Step-by-step explanation:
1+3=4
4+3=7
7+3=10
Wheras if you try to multiply by 4 it works on the first one, but 4×4=16 not 7. If you add 10 to 1 you get 11, which is not the next number. And if you subtract 1-3=-2, which is on the wrong side of 0.
Hope this helps
In a 30-60-90 triangle, how many sides do you need to know in order to determine the remaining sides?
A. 1
B. 2
C. 0
D. 3
Answers
Answer:
Step-by-step explanation:
d