Question

Don't go by my answers pls

Answer 1

Answer:

19)  ( $\frac{-2}{5}$)^2 = $\frac{4}{25}$

20) -$9^{2}$ = -81

21)  $2^{4}$ = 16

Step-by-step explanation:

The only wrong ones are

19)  ( $\frac{-2}{5}$)^2 = $\frac{4}{25}$

20) -$9^{2}$ = -81 ... negative is not inside a parenthesis that's why it is still negative

21) you can add another way is $2^{4}$ = 16

Everything else looks good.  Great job!