Question

Please answer this question

Answer 1

I think it is correct

Hope it may help you.

Answer 2

Step-by-step explanation:

$(a) \: \: \: 8z + 2(z - 2) \\ z = 2 \\ \: \: \: \: \: 8(2) + 2(2 - 2) \\ 16 + 2(0) \\ = 16 + 0 \\ = \underline{ \underline{ 16}} \\ \\ (b) \: \: \: 30\% \: \: of \: \: P \: \: is \: \: 9 \\ \: \: \: 30\% \times P = 9 \\ \frac{30}{100} \times P = 9 \\ \: \: 30P = 9 \times 100 \\ 30P = 900 \\ P = \frac{900}{30} \\ P = \underline{ \underline{30}}$