For question 6, begin by doing $\displaystyle 18.50 \times 5 = 92.50$ (that's how much it would cost for 5 gig tickets separately). Since the batch of 5 costs $80.00, they will save $\displaystyle 92.50-80.00=12.50$.

I'd go for option D for question 8...

Question 9... So the problem here is $\displaystyle \frac{9}{6}=\frac{8}{x}$ (it's easier to see it in tiered fractions. First, I'd multiply up by the 6 to acquire...

$\displaystyle 9=\frac{8\times 6}{x}=\frac{48}{x}$

...and then multiply up by the $\displaystyle x$ to get...

$\displaystyle 9x=48$

Then finally dividing through by 9 gives $\displaystyle x=\frac{48}{9}=5\frac{1}{3}$.