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Crank
4 years ago
10

Please help will give brainliest

Mathematics
2 answers:
Alex777 [14]4 years ago
6 0
So, the questions is 4b * (√7b)^2

= 4b * (√7b) * (√7b)

= 4b * (7b)

= 28b^2

Hope this helps.

If you have any questions, please put them in the comment section below.
Katyanochek1 [597]4 years ago
3 0
Square root to the power of 2 will disappear, so:

-> 4b x (sqroot (7b))^2

= 4b x 7b
= 28b^2
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The mean time it takes to walk to the bus stop is 8 minutes (with a standard deviation of 2 minutes) and the mean time it takes
11111nata11111 [884]
(a) Average time to get to school
Average time (minutes) = Summation of the two means = mean time to walk to bus stop + mean time for the bust to get to school = 8+20 = 28 minutes

(b) Standard deviation of the whole trip to school
Standard deviation for the whole trip = Sqrt (Summation of variances)

Variance = Standard deviation ^2
Therefore,
Standard deviation for the whole trip = Sqrt (2^2+4^2) = Sqrt (20) = 4.47 minutes

(c) Probability that it will take more than 30 minutes to get to school
P(x>30) = 1-P(x=30)
Z(x=30) = (mean-30)/SD = (28-30)/4.47 ≈ -0.45
Now, P(x=30) = P(Z=-0.45) = 0.3264
Therefore,
P(X>30) = 1-P(X=30) = 1-0.3264 = 0.6736 = 67.36%

With actual average time to walk to the bus stop being 10 minutes;

(d) Average time to get to school
Actual average time to get to school = 10+20 = 30 minutes

(e) Standard deviation to get to school
Actual standard deviation = Previous standard deviation = 4.47 minutes. This is due to the fact that there are no changes with individual standard deviations.

(f) Probability that it will take more than 30 minutes to get to school
Z(x=30) = (mean - 30)/Sd = (30-30)/4.47 = 0/4.47 = 0

From Z table, P(x=30) = 0.5
And therefore, P(x>30) = 1- P(X=30) = 1- P(Z=0.0) = 1-0.5 = 0.5 = 50%
8 0
3 years ago
Pls welp will give brainliest to whoever answers correctly first
Sholpan [36]

There are 12 squares in each 4 x 3 grid.

25% of 12 = 3

This means that there should be 3 shaded squares in the grid.

Your answer is B. because it has 3 shaded squares.

7 0
3 years ago
Read 2 more answers
HELP ON THESE 2 QUESTIONSS PLSSSS
GaryK [48]

Answer:

1) the third equation  or X/2=2.0

2)  20 bucks

Step-by-step explanation:

for number 1 just plug in the x hi 4 and try to solve it

2) just calculate unit rate by 120/6=20

6 0
3 years ago
Find the product.<br>3(m+ n)<br>3m+n<br>3m + 3n<br>3mn​
Fynjy0 [20]
You have to expand the expression so that it becomes
3m+3n
7 0
3 years ago
A, B, and C are the vertices of one triangle. D, E, and F are the vertices of another triangle. m∠A = 50, m∠B = 10, m∠E = 40, m∠
adell [148]
The fourth one seems like its the right one 
3 0
3 years ago
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