A biased coin which has a probability of 0.8 of landing on heads is flipped three times. What is the probability that the coin will land on tails all three times?

The function f is defined by f(x) = 4x – 7.

Solve f(x) = 17

Find f^{-1}(x)

In the following diagram, the surface area of the sphere is equal to the surface area of the cylinder. Write an equation showing h in terms of r:

Dasha’s sack contains 5 red balls, 3 blue balls and 2 green balls. She takes two balls from the bag (without replacing them). What is the probability that both of the balls she picks are red?