Your school librarian has asked your class for some on the purchase of some new bookcases with two shelves each. she has 300 new book she needs the shelve. 1/2 of the books are half an inch thick. 1/3 of them are 1/4 of an inch thick and the rest of them or 3/4 of an inch thick. her shelves are 30 inches long. how many bookcases should she buy?

b. would be the answer : )

step-by-step explanation:

step 1: add -16x to both sides.

16x−4y+−16x=64+−16x  

−4y=−16x+64

step 2: divide both sides by -4.

−4y /-4 = -16x + 64/-4

answer:   y=4x−16

hope i'm right

answer: 4  

the square root of 16 is 4. it is a very simple mathematic concept. a square root when a number multiplied by itself will result in a number. here, the number 16 comes when 4 is multiplied by 4. hence the square root of 16 is 4. you can always figure out a square root by the inverse operation of squaring.