Masha answered 84% of the questions
in a test correctly. She answered 126 of the questions correctly.
Work out the total number of questions
in the test.

Ashley takes two cubes out of a bag,
without replacement. There are 5 red,
3 blue and 2 green cubes. What is the probability that he picks two red cubes?

If f(x) = 4x – 7, then solve f(x) = 17

Find f^-1(x)

The surface area of the cylinder is equal
to the surface area of the sphere. Express h in terms of r.