book Maths Puzzle Numerical Ability

I need to simplify this:

10X+4+X-9

Read Solution (Total 0)

book Other Question

I can not for the life of me remember how to do this. I have tried numerous ways and still have not come to the correct answer.

2x to the 4-3x to the 3+x+1 is divided by 2x to the 2+x+1 What is the circumference of a circle if the radius is 64pi?