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.