Question

I need help with all these questions as I don't know what to do with any of them.

Answer 1

$\begin{gathered} 8x-y^2-3 \\ =8(\frac{1}{4})-(3)^2-3\text{ } \\ =2-9-3 \\ =2-12 \\ =-10 \end{gathered}$

answer: 4) -10