You have to use a proportion.
3.5/18= 1.5/x
3.5x=27
x= 7.7 cm
Assuming they mean the fraction is 24/30 the answer is 0.8 (24÷30 is the equation to use)
The answer is 6. you just count the boxes in between the two points
A = P(1+r/n)^<span>(nt)
A = 32,000(1+0.03/4)^28
A = 39,446.78 ...........this is your answer</span>