Which of the following polynomial equations are valid identities?
a. (a + b)(2a + 1) = a(2a + 2b +1)
b. (n+2)2 – n2 = 4(n+1)

only a?
only b?
both?
neither?

and explain why

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.

What is the total area of the figure?