exam Maths Puzzle Numerical Ability

Can someone help me:Solve the inequality

A number divided by 2 is at most 10

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exam Other Question

The directions say, "Simplify each expression." How do you solve the problem r^3t^-7/t^5

I tried dividing the "t"s first. (I though you have to do like terms.) Thanks!
Please help me with this one problem! It does not come from a textbook - it comes from a worksheet.

Problem: This function is one-to-one. Find F^-1.

f(x) = 9x/3-x

I rea