Hi I need help On his Multiple Choice questions Try)- and not get it wrong or I cant Complete My Maths Work. The Question itself is on the Image attached Below: thanks!

Answer:
a) Option A is correct.
b) Option B is correct.
Step-by-step explanation:
[tex]a) \: \: 5 \times a \\ = 5a[/tex]
[tex]b) \: \: b \times b \\ = {b}^{2} [/tex]