x^2+9x+20
-9+-√(9)^2-4(20)/2
-9+1/2 , -9-1/2
-8/2 , -10/2
-4,-5
Answer:
(x+4)(x+5)
Step-by-step explanation:
Let's factor x2+9x+20
x2+9x+20
The middle number is 9 and the last number is 20.
Factoring means we want something like
(x+_)(x+_)
Which numbers go in the blanks?
We need two numbers that...
Addd together to get 9
multiply together to get 20
Can you think of the two numbers? hmmmmmm :D
Try 4 and 5:
4+5 = 9
4*5 = 20
Fill in the blanks in
(x+_)(x+_)
with 4 and 5 to g.et...
(x+4)(x+5)
Hope this helps :D
Angela wants to use a one-sample zzz interval to estimate what proportion of employees at her large corporation are satisfied with their benefits. She plans on using a confidence level of 90\%90%90, percent, and she wants her margin of error to be no more than \pm 5\%±5%plus minus, 5, percent.
Answer:
Step-by-step explanation:
It's 271 on Khan Academy
The sample space size that Angela wants to use for the employees who are satisfied with their benefits is. 271
What is margin of error?In statistics, the margin of error is the level of inaccuracy in the findings of surveys using random samples. Less reliance on survey or poll results is indicated by higher statistical margins of error.
Given that,
[tex]\^p[/tex] = 0.5
1 - [tex]\^p[/tex] = 1 - 0.5= 0.5
margin of error = E = 5% = 0.05
At 90% confidence level
= 1 - 0.90 = 0.10
0.10/2 =0.05
Z/2 = 1.645 ( Using z table )
Sample size = n = (Z/2 / E)² x (1 - [tex]\^p[/tex])²
= (1.645 / 0.05)² * 0.5 x 0.5
=270.6
Sample size = 271
The required sample size is 271.
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Which scatterplot shows a nonlinear association?
Answer:
B
Step-by-step explanation:
B shows a parabola, which is a quadratic equation, not a linear one.
The association between two numerical variables measured for the same individuals is displayed in a scatterplot. One variable's values are displayed on the horizontal axis, and the other variable's values are displayed on the vertical axis. On the graph, each individual in the data is represented by a point.
What is scatter plot?A scatter plot is a type of plot or mathematical diagram using Cartesian coordinates to display values for typically two variables for a set of data. If the points are coded, one additional variable can be displayed.
here, we have,
we know that,
The relationship between two economic phenomena, such as employment and output, inflation and retail sales, and taxes and economic growth, can be visually illustrated using scatter plots.
Spread Plots. Points on a scatter (XY) plot depict how two sets of data relate to one another. Each dot in this illustration represents a person's weight in relation to their height. (The information is displayed as "Cartesian (x, y) Coordinates")
Display a connection between the data and a trend. Display all data points, including outliers, minimum, and maximum values. can draw attention to relationships. the sample size and exact data values are retained.
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HELPPME PLEASE ASAP i will give brainliest
Answer:
don't know but I think these is the answer =
17
Step-by-step explanation:
90 - 73 = 17
Please help really struggling..... Need the grade and just answer the question and not for just the points, no links!!!! Marking brainliest!!!!!
Answer:254.47 I think
Step-by-step explanation:
please help due pretty soon
Answer:
C. y - 1 = 5( x - 8)
Step-by-step explanation:
Since line is passing through (8, 1) and has a slope 5.
So, the equation of line in point slope form is given as:
y - 1 = 5( x - 8)
Answer: C
Step-by-step explanation:
What is the vertex for the parabola shown?
A) (1.2)
B) (2,1)
C) (0.1.5)
D) (-1,3)
Answer:
the answer is B
Step-by-step explanation: Its B because the vertex is in the middle
Describe in your own words how graphing equations can help find the
solution to a system of equations?
Answer:
i think that if u can please redo this question it might help
Sara and Dan left a 20% tip after having dinner at a restaurant. The amount of the tip was $5. Sara's dinner cost $15. Which equation can you use to find x, the cost of Dan's dinner?
Answer:
c
Step-by-step explanation:
Factorise this pleasee
x2− 7x
Step-by-step explanation:
take X common
x2-x7
X(2-7)
X(-5) Answer
It may helps
Answer:
x(x - 7)Step-by-step explanation:
x² - 7x = x*x - 7*x =x(x - 7)determine the total surface area.
Answer:
it should be 288
Step-by-step explanation:
LOOK AT THE PIC BELOW
Answer:
B. 200 cubic feet
Step-by-step explanation:
There are two prisms: the triangular prism and the rectangular prism
first lets start with the triangular one:
remember that for a right triangular prism (this one), the area is 1/2 x base x height x length
another way to think about it is to find the area of the triangle and then multiply that by the thickness
The base is 4 feet and the height is the same as the rectangular prism, which is 5
and the length is 4 ft (same as rectangular prism)
so 1/2 x 4 x 5 x 4 is 40
next lets do the rectangular prism
remember the volume is length x width x height
8 x 4 x 5 = 160
now we simply add the volume of the two prisms
40 + 160 = 200
and there's you're answer :)
hope that helps!
Answer:
Step-by-step explanation:
Area of triangular face = 0.5×4×5 = 10 ft²
Volume of triangular prism = 10×4 = 40 ft³
Volume of rectangular prism = 8×4×5 = 160 ft³
Total volume = 40+160 = 200 ft³
Samuel is a teacher and takes home 75 papers to grade over the weekend. He can grade at a rate of 7 papers per hour. How many papers would Samuel have remaining to grade after working for 8 hours?
Answer: 19
Step-by-step explanation:
75 papers need to be marked
He grades 7 papers per hour
To find out how many paper he graded in 8 hours:
7 x 8
(7 is the number of papers graded in an hour)
(8 is the number of hours)
7 x 8 = 56
(56 is the number of papers he graded in 8 hours)
Now, there was a total of 75.
To find the remaining number of test sheets:
75 - 56
(75 is the total number of papers)
(56 is the number of papers graded)
75 - 56 = 19
Therefore, there are 19 papers remaining to grade.
7.) *
1 point
Does (0, 0) make the equation y
2x true?
Answer:
yes (0,0) does make the equation y
2x true?
Step-by-step explanation:
just trust me i wasnt
able to provide an example sorry but please give me 5 stars and name me brainliest
10 and
In acute triangle ABC, side b = 12, side c =
mLA = 42. Find side a.
Answer:
20
Step-by-step explanation:
I'm not completely sure, however.
12+10 = 22
42-22 = 20
ANSWER ASAP PLEASEEE
Brenda took one of her friends out to lunch. The lunches cost $70 and she paid 10% sales tax. If Brenda left a 10% tip on the $70, how much in total did she pay?
Answer: $84
Steps:
70 * 10%
70 * 0.10 = $7 sales tax
70 * 10%
70 * 0.10 = $7 tip
$70 lunch cost + $7 sales tax + $7 tip = $84
what is the mean of this data set 8 +16 +10+21 +6 +13+8 +26
i got the last one wrong , pls give me the right answer i need atleast a 75%
A bus and a car both drive 145 miles from town A to town B. The bus drives 8 miles per hour faster than the car. If it takes the car 2 hours and 54 minutes to arrive, how long does it take for the bus to arrive?
Answer: 2.5 hours
Step-by-step explanation:
Given
Distance between A to B town is [tex]d=145\ miles[/tex]
Bus speed is 9 miles per hour faster than car
time taken by car is 2 hours and 54 minutes i.e.
[tex]t=2+\dfrac{54}{60}=2+0.9=2.9\ hr[/tex]
Speed of car is v
[tex]\Rightarrow v=\dfrac{d}{t}=\dfrac{145}{2.9}=50\ mph[/tex]
Speed of bus is [tex]v+8=50+8=58\ mph[/tex]
time taken by bus is t'
[tex]\Rightarrow t'=\dfrac{d}{v+8}=\dfrac{145}{58}=2.5\ hr\\\\\\\Rightarrow t'=2\ hr\ \text{and}\ 30\ \text{minutes}[/tex]
Drew's car weighs 1,344 kilograms. His car weighs 7 times as much as his motorcycle. How many grams does his motorcycle weigh? Note: 1 kilogram = 1000 grams
Answer:
192,000 grams
Step-by-step explanation:
turn 1,344 kilograms to grams, which gives u 1344000 grams
divide 1344000 by 7 and you get 192,000 grams. Hope this helped :)
Expand and simplify 4(2p+7)+6(8q-2)
Answer:
8 p + 48 q + 16
Step-by-step explanation:
NEED HELP ! PLEASE HELP ASAP !
Answer:
distance between points is 5.6568...
when you round it will be 5.7
answer is 5.7
Step-by-step explanation:
find the distance between two points using distance formula
The difference of place values of 5's in 65512 is ?
Answer:
6 (5000, thousandths place) (500, hundreds place) 12
If I'm incorrect someone correct me, but overall hope this helps!
The difference of place values of 5's in, 65512 is 4500.
What is place value?Each digit value in a number is obtained as the place value.
The given number is , 65512
The 5 on the first place denotes the value 5000. While the 5 on the first place denotes the value 500.
The difference of place values of 5's in, 65512 is found as;
x=5000-500
x=4500
Hence,the difference of place values of 5's in, 65512 is 4500.
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WILL GIVE BRAINLIEST NEED ASAP
The following system of equations has exactly one (x, y) pair for its solution.
4x + 6y= 24
2x+y=8
If we add the two equations in the original system, we have 6x + 7y= 32.
Explain why the same (x, y) pair is also a solution to this equation. Use math and be
specific in your explanation!
The question is asking me choose all of the numbers that are unit fractions, and here are my options, 14 <16 14 <16 510<36 510<36 12>13 1 half is greater than 1 third 48>26 4 eighths is greater than 2 sixths 35>45
Answer:
[tex](d)[/tex] [tex]\frac{4}{8}>\frac{2}{6}[/tex]
Step-by-step explanation:
Given
[tex]\frac{1}{4} <\frac{1}{6}[/tex]
[tex]\frac{5}{10}<\frac{3}{6}[/tex]
[tex]\frac{1}{2}>\frac{1}{3}[/tex]
[tex]\frac{4}{8}>\frac{2}{6}[/tex]
[tex]\frac{3}{5}>\frac{4}{5}[/tex]
Required
Select the unit fractions
If we are to go by what a unit fraction means: it means that the numerator of the fraction must be 1 and must be written as a single fraction i.e. [tex]\frac{1}{2}[/tex] and not as an inequality i.e. [tex]\frac{3}{5}>\frac{4}{5}[/tex]
Given the format of the question, what is required of the question is to select all correct inequality.
[tex](a)[/tex] [tex]\frac{1}{4} <\frac{1}{6}[/tex]
Convert to decimals
[tex]0.25 < 0.167[/tex] ---- This is not true because [tex]0.25 > 0.167[/tex]
[tex](b)[/tex] [tex]\frac{5}{10}<\frac{3}{6}[/tex]
Convert to decimals
[tex]0.5 < 0.5[/tex] ---- This is not true because [tex]0.5 = 0.5[/tex]
[tex](c)[/tex] [tex]\frac{1}{2}>\frac{1}{3}[/tex]
Convert to decimals
[tex]0.5 > 0.33[/tex] ---- This is true
[tex](d)[/tex] [tex]\frac{4}{8}>\frac{2}{6}[/tex]
Convert to decimals
[tex]0.5 > 0.33[/tex] ---- This is true
[tex](e)[/tex] [tex]\frac{3}{5}>\frac{4}{5}[/tex]
[tex]0.6 > 0.8[/tex] --- This is not true because [tex]0.6 < 0.8[/tex]
So: the true inequality is:
[tex](d)[/tex] [tex]\frac{4}{8}>\frac{2}{6}[/tex]
Crystal's soccer team won 14 of the 20 games they played last season. What percent of games played did they win?
Answer:
70%
Step-by-step explanation:
hooe this helps plz follow ❤❤
The temperature at 5:30 A.M. was recorded as 7 degrees below zero on the Fahrenheit scale. Write the temperature using a signed number
Answer:
mhhm yea this is very questioned questioned
Step-by-step explanation:
yea mhm
Can someone plz help me on this plz
The width of a rectangle is 7 feet and the diagonal legnth of the rectangle is 11 feet. Which measurement is closest to the length of this rectangle in feet?
Answer:
8.49 feet
Step-by-step explanation:
Characteristics of a rectangle
A rectangle is a quadrilateral It has two parallel sides the diagonals of a rectangle bisect each other and they are equal in lengthOne diagonal of a rectangle divides a rectangle into two right angled triangles. Thus, the length of the rectangle can be determined using the Pythagoras theorem
The Pythagoras theorem : a² + b² = c²
where a = length = ?
b = width = 7
c = diagonal = 11
7² + a² = 11²
49² + a² = 121²
a² = 121 - 49
a² = 72
calculate the square root of 72
a = 8.49 feet
Answer:
8.49 feet
Step-by-step explanation:
Which of the following statements best describes the data?
Answer:
Carlos accounts for more than 25% of the total strikeouts
Step-by-step explanation: Carlos scored 13 points so divide 13 by 37 to get the score Carlos makes up of the 6 people
13/37 = 0.35 or 35%
(The total number of points for all 6 people is 37)
How many arms do a 6 starfish have?
So 30 is the answer
Hope this helps