Book Maths Puzzle Percentage

FIND THE INTERGER....
YOU HAVE A TEST AND YOU MISS 9 QUESTIONS AND MADE 89%
HOW MANY QUESTIONS WERE ON THE TEST

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Book Other Question

How to divide by Binomials? I need a tecnique on how to solve?
The problem is 2x^2-3x-5 divided by x-3
Thanks Here is the math problem: 3/4p (8-6p + 12x^3) And I know the answer is this: 6p-9/2 + 9p^4, but where did we get the 9/2 and 9p^4 from? I'm confused.