Without a calculator, solve
2.25 x 13.3

Figure abcd is a parallelogram. if point c lies on the line x = 2, what is the y-value of point c

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

How is working backward similar to solving an equation?