Is 36,and 64 a perfect square why or why

36 is perfect square because 36 = 6*6
64 is perfect square  because 64 = 8*8

They are both perfect squares because their roots are whole numbers

6 x 6 = 36

8 x 8 = 64

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post