Answer:
12
Step-by-step explanation:
Alicia has 3 sisters.
Connor has twice as many sisters.
Twice means "two times".
Connor has 2×3, that is 6 sisters.
Carly has twice (two times) as many sisters as Connor.
Carly has 2×6, or 12 sisters.
Students were trying to use the sample standard deviation formula for the given
data: (8,1,3,0,3). Determine what they did wrong for each case and calculate the
correct value.
S=
Σ(x − x)2
n-1
The sample standard deviation formula is
square root {(Σ(X - mean)²) / (N - 1)}
What the student did wrong?
The square root sign was not included in their calculation
The correct value of the sample standard deviation is = 3.08
What is standard deviation?Standard deviation shows the by how much the values differs from the mean.
How to calculate the sample standard deviationThe calculation is done by forming the table and calculating the required variables as below:
X (X - mean)²
8 25
1 4
3 0
0 9
3 0
ΣX = 15
mean = ΣX/N = 15/5 = 3
Σ(X - mean)² = 38
Σ(X - mean)² / (N-1)
= 38 / 4
= 9.5
Sample standard deviation = √9.5
= 3.08
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Solve for b, then solve for each angle in the triangle
We know that the sum of the interior angles of a triangle equals 180, then,in this case we have the following equation:
[tex]b+2b+(b+16)=180[/tex]then, solving for b, we get:
[tex]\begin{gathered} b+2b+(b+16)=180 \\ \Rightarrow4b+16=180 \\ \Rightarrow4b=180-16=164 \\ \Rightarrow b=\frac{164}{4}=41 \\ b=41 \end{gathered}[/tex]now that we have that b = 41, we can find the measure of each angle:
[tex]\begin{gathered} b=41 \\ 2b=2(41)=82 \\ b+16=41+16=57 \end{gathered}[/tex]determine the inverse function of f(x) = x² + x - 6, x> - 1/2, if it exists. Then, state its domain and range.
Since the domain is restricted to one side of the axis of symmetry of the full graph of f(x), an inverse does exist.
Letting [tex]f(x)=y[/tex],
[tex]x=y^2 +y-6\\\\x=\left(y+\frac{1}{2} \right)^2 -\frac{25}{4}\\\\x+\frac{25}{4}=\left(y+\frac{1}{2} \right)^2[/tex]
Since the domain is restricted to the right hand side of the axis of symmetry, and since the range of the inverse is the same as the domain of the original function, we take the positive square root.
[tex]\sqrt{x+\frac{25}{4}}=y+\frac{1}{2}\\\\y=f^{-1}(x)=\sqrt{x+\frac{25}{4}}-\frac{1}{2}[/tex]
The domain of the inverse is the range of the original function, which is [tex]\left[-\frac{25}{4}, \infty \right)[/tex].
The range of the inverse is the domain of the original function, which is [tex]\left[-\frac{1}{2}, \infty)[/tex],
Write the equation of the line in point-slope form that has a slope of 2/3 and a y-intercept of (0,-2)
y-2= 2/3 (x-0)
y-0= 2/3 (x-2)
y-0=2/3 (x+2)
y+2=2/3 (x-0)
Answer:
y + 2 = 2/3(x - 0)
Step-by-step explanation:
The general form of an equation of line with slope m, passing through point (x1, y1) is:
y - y1 = m(x - x1)
substituting values:
y - (-2) = 2/3(x - 0)
simplify
y + 2 = 2/3(x - 0)
Answer:
where
m(Gradient or slope) =2/3
y1=-2
x1=0
choose the correct description of the graph of the compound inequality1: A number line with an open circle on 0 shading to the left and a closed circle on 2 shading to the right2: A number line with a closed circle on 0, shading to the left, and an open circle on 2 shading to the right3: A number line with a closed circle on 2, and shading in between 4: A number line with an open circle on 2, and shading in between
Answer:
Step-by-step explanation:
HELPPPPPPPPP PLEASEEEEEEEEEE
-6 x 1.5 ______ 50 ÷ (-8) which is greater
Answer: The answer is that 50 ÷ (-8) is greater
Answer:
-6 x 1.5 < 50 ÷ (-8)
-6 x 1.5 = -9
50 / -8 = -6.25
50 divided by -8 is greater than -6 times 1.5p
Step-by-step Explanation:
=D
how do you start square roots in mathmaticals?
Answer:
a square root is basically any number multiplied by itself to get another number. there are 2 types, perfect and non perfect, perfect is when the number being multiplied by itself is an a whole number, while the non perfect is when the number that is being multiplied by itself is a decimal or fraction
Step-by-step explanation:
if EB=7, find the value of CD
Both lines AB and CD are secant lines beacuse in two points they are touching the circunference. There is a Theorem which says the following
[tex]PB\cdot PA=PD\cdot PC[/tex]Since the distance from the center of the circle to each secant line is the same (5 units), we could assume that the both secant lines are similar. saying:
[tex]PB=PD;\text{ }PA=PC\Rightarrow AB=CD[/tex]Then the lenght of CD is:
[tex]CD=2\cdot EB=2(7)=14[/tex]Find the sum of the first 9 terms of the following sequence. Round to the nearesthundredth if necessary.40,-16,32/5
SOLUTION
The following sequence is a geometric series and we have been provided with the formula
[tex]S_n=\frac{a_1-a^{}_1r^n}{1-r}[/tex]Here a1 is the first term = 40,
r is the common ratio = -0.4 (to get r, divide the second term by the first term)
n = number of terms = 9. Now let's solve
[tex]\begin{gathered} S_n=\frac{a_1-a^{}_1r^n}{1-r} \\ \\ S_9=\frac{40_{}-40\times(-0.4)^9}{1-(-0.4)} \\ \\ S_9=\frac{40_{}-(-0.0105)^{}}{1+0.4} \\ \\ S_9=\frac{40_{}+0.0105^{}}{1+0.4} \\ \\ S_9=\frac{40.0105^{}}{1.4} \\ \\ S_9=28.5789 \end{gathered}[/tex]The sum to the nearest hundredth becomes = 28.58
PLEASE HURRY
What is the value of the expression −34 − 17 − (−22)?
Answer:
-29
Step-by-step explanation:
subtracting the negative 22 from the -17 made it positive until you subtract the 34 which made it -29
How do I solve this, and how do I know if I need to add or subtract at the beginning
Let's solve the system of equations using elimination:
4x + 5y = 14
-4x -2y = -8
First, we need to get rid of one variable.
Sometimes we multiply them by some factors to have the same number on one variable, but in this case, we can subtract the x variable
4x +5y =14
-4x-2y = -8
----------------------
4x-4x =0, 5y -2y = 3y and 14-8=6
------------------------------
0+3y = 6
Solve the equation for y
Divide by 3 into both sides
3y/3 = 6/3
y = 2
Then, replace this variable on one equation, whichever you want:
4x + 5y = 14
4x +5(2) = 14
4x +10 = 14
and solve the equation for x
4x +10 = 14
Subtract 10 on both sides
4x +10-10 = 14-10
4x = 4
Divide by 4 into both sides
4x/4 = 4/4
x = 1
You can replace both variables to confirm the results:
4x +5y =14
4(1) +5(2) = 14
4 +10 = 14
14 = 14
---------------------------------
-4x -2y = -8
-4(1) -2(2) = -8
-4-4 = -8
-8 = -8
The result is correct, so my ordered pair is (x,y) = (1,2)
I need help trying to find side c and to see if my other answers are correct?
we have that
B=5 degrees
C=125 degrees
b=200 units
step 1
Find out the measure of angle A
Remember that
the sum of the interior angles in any triangle must be equal to 180 degrees
so
A+B+C=180
substitute given values
A+5+125=180
A=180-130
A=50 degrees
step 2
Applying the law of sines
[tex]\frac{\sin A}{a}=\frac{\sin B}{b}=\frac{\sin C}{c}[/tex]Find out the value of a
[tex]\frac{\sin A}{a}=\frac{\sin B}{b}[/tex]substitute given values
[tex]\frac{\sin 50^o}{a}=\frac{\sin 5^o}{200}[/tex]solve for a
[tex]a=\frac{200\cdot\sin 50^o}{\sin 5^o}[/tex]a=1,757.9 units
step 3
Find out the value of c
[tex]\frac{\sin B}{b}=\frac{\sin C}{c}[/tex]substitute given values
[tex]\frac{\sin 5^o}{200}=\frac{\sin 125^o}{c}[/tex][tex]c=\frac{200\cdot\sin 125^o}{\sin 5^o}[/tex]c=1,879.7 unitsWhich expression is equivalent to (-3t - x) - (5y - 8x)?
What’s the correct answer answer asap for brainlist
Answer:
the answer is C..........
A bell rings every 20 minutes. A horn blows every 30 minutes. If Htel Htel heard the two sounds at 8:00AM, at what time will be hear the sounds together again.
Answer:
Htel Htel will hear the sounds again at 9:00 AM
A rectangular auditorium seats 1749 people the number of seats in each row exceed the number of rows by 20 find the number of seats in each row
Let x = the number of seats
Let y = the number of rows.
Since the auditorium is rectangular and it has 1,749 people, then we can say that:
[tex]x\times y=1749[/tex]Then, if the number of seats "x" exceeds the number of rows "y" by 20, then we can say that:
[tex]\begin{gathered} seat=row+20 \\ x=y+20 \end{gathered}[/tex]Now we have two equations. To solve for x, let's use the substitution method.
1. Rewrite the equation 2 x = y + 20 into y = x - 20.
2. Replace the value of "y" in equation 1 by x - 20.
[tex]\begin{gathered} xy=1749 \\ x(x-20)=1749 \end{gathered}[/tex]2. Multiply x and x - 20.
[tex]x^2-20x=1749[/tex]3. Transfer the constant term 1749 on the left side of the equation. When transferring over the equal sign, the operation will change. From +1749, it becomes -1749.
[tex]x^2-20x-1749=0[/tex]4. To solve this quadratic equation, let's find the factors of -1749 that sums to -20.
a. 3 and -583 = -580
b. 11 and -159 = -148
c. 33 and -53 = -20
As we can see above, the factors of -1749 that sums to -20 are 33 and -53. Hence, the quadratic equation above can be factored to:
[tex](x+33)(x-53)=0[/tex]5. Equate each factor to zero and solve for x.
[tex]\begin{gathered} x+33=0 \\ x=-33 \end{gathered}[/tex][tex]\begin{gathered} x-53=0 \\ x=53 \end{gathered}[/tex]Since the value of x cannot be negative, then the value of x is 53.
Therefore, the number of seats in each row is 53. In addition, there are 33 rows in the auditorium.
Compute the complement rate where the trade discount rate is 15%.
The Complement rate where Trade discount rate is 15% = 100 - 15 = 85%.
Thanks
If (-1, y) is a solution to the equation y = x + 5, determine the value of y.
HELP I WILL MARK BRAINLIEST
Answer:
4
Step-by-step explanation:
The solution to the equation means that the coordinate satisfy the equation. Given that the equation is y= x +5, we know the relationship between the y-coordinate (y) and the x-coordinate (-1) of the point.
y= x +5
Substitute the coordinates into the equation:
When x= -1, y= y,
y= -1 +5
y= 4
Thus, the value of y is 4.
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An expresion is shown. - 2 3 /4 + 3 2/3 What is the value of the expression?
,By following these steps, we can find the value of this expression:
[tex]-2\times\frac{3}{4}+3\times\frac{2}{3}[/tex]first we multiply both -2 and 3 by their corresponding fractions, we do this by just multiplying the numbers with the numerator of the fraction, like this:
[tex]\frac{-2\times3}{4}+\frac{3\times2}{3}=\frac{-6}{4}+\frac{6}{3}=-\frac{6}{4}+\frac{6}{3}[/tex]Now simplify the fractions:
[tex]-\frac{6}{4}+\frac{6}{3}=-\frac{3}{2}+2[/tex]To sum fractions, we have to make sure that the denominators are the same, this is not the case, we can make their denominators the same by dividing and multiplying the two by two, like this:
[tex]-\frac{3}{2}+2=-\frac{3}{2}+\frac{2\times2}{2}=-\frac{3}{2}+\frac{4}{2}[/tex]Now, we just have to sum up the numerators, like this:
[tex]-\frac{3}{2}+\frac{4}{2}=\frac{-3+4}{2}=\frac{1}{2}[/tex]Then, the value of this expression is:
[tex]\frac{1}{2}[/tex]A food company sells its corn flakes in two different sizes: the regular box and the family value box. For the family value box, the length of the box has been increased by 30%, the height has been increased by 25%, and the width remains the same.By what percentage does the volume of the box increase from the regular box to the value box? Round your answer to the nearest percent.
Hay, this is the solution:
Length of the box = increased 30%
Height = Increased 25%
Width = Remains the same
Volume of the value box = 1.3 * 1.25 * 1
Volume of the value box = 1.625
Volume of the regular box = 1 * 1 * 1
Volume of the regular box = 1
Percentage of increase = 1.625/1 - 1
Percentage of increase = 0.625
Percentage of increase = 62.5 = 63% (Rounded to the nearest p
Answer the questions below.
Mr. Cumme has 8 3/4 yards of material for her class. he needs to use 1/3 of the material to make an example. How many yards of material will he need to make the example?
Given:
Mr. Cumme has 8 3/4 yards of material for her class.
he needs to use 1/3 of the material to make an example.
To find the number of yards of material that he will need, we will multiply 1/3 by 8 3/4 to get the answer.
[tex]\frac{1}{3}\times8\frac{3}{4}=\frac{1}{3}\times\frac{35}{4}=\frac{35}{12}=2\frac{11}{12}[/tex]So, the answer will be 2 11/12 yards.
Michael bought 1/2 pound of Swiss cheese. He used 1/4 pound for
a sandwich. How much was left?
Answer:
1/4
Step-by-step explanation:
1/2 - 1/4 = 2/4 - 2/4 = 1/4
DUE IN 30 MINUTES PLEASE HELP!!!!
WITH WORK PLEASE
1. Write a piecewise defined rule from a graph
2. Write three equations and show all your steps to get full credit
For the given question,
The coordinates of the three lines are given with the end points.
Part a: The slope piece wise rule for defined graph is-
[2, 1) - as (1 - 1) is at the open interval.[1,5] - both ends with closed interval.[5,8] - both ends with the closed interval.Part b: calculate the three equations-
First find the slope for the three given lines;
slope (blue line);
coordinates - (0, -4) and (1, -1)
m = (-1 + 4)/(-1 - 0)
m = -3
Equation of line;
y + 4 = -3(x -0)
y = -3x - 4
slope (red line);
coordinates - (1, 4) and (5, 8)
m = (8 - 4)/(5 - 1)
m = 4/4
m = 1
Equation of line;
y - 4 = 1(x - 1)
y = x + 3
slope (green line);
coordinates - (5, 8) and (8, 8)
m = (8 - 8)/(8 - 5)
m = 0
Equation of line;
y - 8 = 0(x - 5)
y = 8
Thus, the three equation of line are found.
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For the data in the table, does y vary directly with x? If it does, write an equation for the direct variation.A. yes; y=2xB. yes; y=3xC. yes; y=4xD. no; y does not vary directly with x.
We are given a table with values of "x" and associated values of "y". Let's remember that direct variation implies that each value of "y" will be related with its corresponding value of "x" according to the following relationship:
[tex]y=kx[/tex]Where "k" is the constant of proportionality. If the table shown has direct variation the same constant should apply for each value. Let's take the first value of the table, that is, x = 3 and y = 6. Substituting we get:
[tex]6=k(3)[/tex]Dividing both sides by 3 we get:
[tex]\frac{6}{3}=k[/tex]Solving the operations:
[tex]2=k[/tex]Now we substitute in the relationship:
[tex]y=2x[/tex]Now, for the second value of "x", that is x = 6:
[tex]\begin{gathered} y=2(6) \\ y=12 \end{gathered}[/tex]Since we did not get the corresponding value of "y" in the table, this means that the constant of proportionality doesn't work for this value, and therefore, "y" does not vary directly with "x".
The triangle is translated. B' is the translated position of B.
Draw the new triangle, then verify that they are congruent with the distance formula.
The new triangle A'B'C' shown in the attached graph has the coordinates of B' are (2, 8), A' are (1, 6), and C' (4, 6).
What are congruent triangles?Two triangles are said to be congruent if their corresponding sides and angles are equal.
The given triangle ABC shown in the graph has:
The coordinates of B are (-7, 6),
The coordinates of A are (-8,4),
The coordinates of C are (-5, 4)
If B' is the translated position of B.
The new triangle A'B'C' shown in the attached graph has:
The coordinates of B' are (2, 8)
The coordinates of A' are (1, 6)
The coordinates of C' are (4, 6)
Length of AB = A'B' = √5
Length of BC = B'C' = 2√2
Length of CA = C'A' = 3
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Complete the table given the following function:
f(x) = −2x^2 + 1
Answer:
if f(-4) = -31
then
f(-2) = -7
f(0) = 1
f(1) = -1
f(3) = -17
Step-by-step explanation:
You have to replace the x of the f(x) equation with said number in the left column. Then plug it into your calculator and your golden :]
f(x) = -2x²+1
= -2(-4)²+1
= -32+1
= -31x = -2f(x) = -2x²+1
= -2(-2)²+1
= -2(4)+1
= -8+1
= -7x = 0f(x) = -2x²+1
= -2(0)²+1
= -2(0)+1
= 0+1
= 1x = 1f(x) = -2x²+1
= -2(1)²+1
= -2(1)+1
= -2+1
= -1x = 3f(x) = -2x²+1
= -2(3)²+1
= -2(9)+1
= -18+1
= -17The time to complete a standardized exam is approximately normal with a mean of 70 minutes and a standard
deviation of 10 minutes. How much time should be given to complete the exam so that 80% of the students will complete the exam in the time given?
(A) 61.6 minutes
(B) 78.4 minutes
(C) 79.8 minutes
(D) 80.4 minutes
which set could not represent the lengths of the slides of a triangle?
hello
to solve this question, we asume it's a right angled triangle and we use pythagorean theorem
pythagorean thorem states that the square of the longest side which is the hypothenus of a triangles is equal to the sum of the square of the two other sides which are the opposite and adjacent
according to pythagorean
[tex]x^2=y^2+z^2[/tex]now we go through the options
from the first option (3, 4, 5)
the longest side here is 5
let's check if this is true
[tex]\begin{gathered} x^2=y^2+z^2 \\ 5^2=4^2+3^2 \\ 25=16+9 \\ 25=25 \end{gathered}[/tex]option 1 is represents a triangle
let's check option 2
(2, 5, 9)
longest side = 9
[tex]\begin{gathered} 9^2=2^2+5^2 \\ 81=4+25 \\ 81\ne29 \end{gathered}[/tex]option 2 does not represents a triangle and it's the right option here