How do i finish this problem? i keep getting stumped here

Evaluate the expression for the given value of the variable. | ? 4 b ? 8 | + ? ? ? 1 ? b 2 ? ? + 2 b 3 -4b-8+-1-b2+2b3 ; b = ? 2 b=-2

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with

Extra points! find the missing dimension! need asap