The answer is D (n+5)-6=10
Make two equations. Then solve. Let t and b represent the numbers of pages in the Tax Code and Bible, respectively.
t - b = 18,528 . . . . . tax code exceeds Bible by 18,528 pages
t + b = 21,472 . . . . .together, they total 21,472 pages
Add the two equations.
2t = 40,000
t = 20,000
The number of pages in the tax code is 20,000.
We know that
By linearity of the definite integral,
Presumably, you're aware that
for any two numbers a and b, so the last integral is simply 6.
From the known integrals, we also know
so