True or false the difference between consecutive perfect square numbers is always odd

Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)

Ateacher has $80 to buy workbooks. each work book cost $3. if she buys as many workbooks as possible, how much money does she have leftover? a) $2 b) $4 c) $6 d) $8

Select the sequences that are geometric.