When a cube with sides numbered one through six is roll one time what is the probability of rolling a four or greater?

Prove that the sum of two consecutive exponents of the number 5 is divisible by 30.if two consecutive exponents are 5n and 5n + 1, then their sum can be written as 30.

Segment an is an altitude of right δabc with a right angle at a. if ab = 2, squared 5 in and nc = 1 in, find bn, an, ac.

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x