Start with

We observe that both fractions are not defined if
. So, we will assume
.
We multiply both numerator and denominator of the first fraction by 3 and we sum the two fractions:

We multiply both sides by
:

We move everything to one side and solve the quadratic equation:

We check the solution:

which is true
Y=k/x
2.5=k/6
k=15
wheny x=4, y=15/4
y=3.75
Q= 9 D=3 N=5 those are the answers
Volume = pi * radius^2 * height
= 3.14 * 5^2 * 13
= 3.14 * 25 * 13
= 1020.5
I think one of the answers would be 9.82