Please help me with these problems

Find the surface area of each prism below.

walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.

76%

step-by-step explanation:

24% are dogs and the remaining is 76% because 100-24=76

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify