The graph of

is shown in the graph below.
The graph is of ∩-shape when the constant

of the quadratic equation

is negative
We know that he is 6 songs away from 100.
The question is: How many songs away from 100 is he? Well, 6, of course!
(An interger is just any number that doesn't have decimals. ...-2, -1, 0, 1, 2, 3...etc.)
The anwser is 19 remainder 4
PR : RC = PQ : AC
so,
PQ = 2.8 inches
Hope this helps
All real numbers is the answer