I NEED HELP ANSWERING THESE QUESTIONS FIRST ANSWER GET BRAINLIEST!

3 - b=12

4- b=14.1

Step-by-step explanation:

Area of the bookshelf=864 square inches

the book shelf is a rectangular prism

if we have height=4b, width=3b, length=b

then the area=length * width

A=(l*w)*2 ( we have 2 shelves)

864=(b*3b)*2

864=6b²

b²=864/6=144

b=√144= 12 inches

4- to cover the sides :

(height * length)*2   ( we have 2 sides)

(4b*b)×2=1600

8b²=1600

b²=1600/8=200

b=√200=14.1

Question #3:  b = 12 in

Question #4:  b = 14.1 in

Step-by-step explanation:

Please see in the image attached the actual proportions that the furniture manufacturer uses to build the furniture in question:

Height = 4 b

Width = 3 b

Depth = b

So for question #3, given that the customer wants a total surface of the shaded shelves to be 864

we can write that one wants twice the area of each rectangle of width 3 b and depth b to total 864:

Question # 4:

The total lateral surface to be covered by the silk is 1600 , therefore if we consider the surface of each lateral plank as:

Area of each lateral plank :

Then twice these is:

So we can solve for be requesting that these total surface equal the amount of silk:

which rounded to the nearest tenth of an inch gives:

your answer is 228

step-by-step explanation:

add the top and bottom bases together, then divide them by 2, then multiply by the height.

answer is the third choice:

3x^5+4x^4+x^3+2x^2-10x-7=0

step-by-step explanation: