Anthony knows that the average test score in the population is 85. Anthony believes that studying every night for a week leading up to a test improves test scores. To test this, he asks a random sample of 61 people to study every night for a week leading up to the test. His sample scores an average of 89 with a standard deviation of 15. Does studying every night for a week leading up to a test significantly improve test scores

step-by-step explanation:

659

hello from mrbilldoesmath!

answer:   x (x+6)^2, choice b

discussion:

factor x out of the equation:

x^3 + 12x^2 + 36x = x (x^2 + 12x + 36).

note that 6+6 = 12 and 6*6 = 36 so the above factors into:

x (x+6)^2

which is choice b

you,

mrb

b. 18

step-by-step explanation:

so the equation for this is:

ab^2=ac⋅ad

ab being the top length of 6 and ac being the length of 2 and ad being the length of x. let's plug into the equation:

6^2 = 2x

now lets just solve for x:

36 = 2x

18 = x

i hope that !