Seven times a number is the same as 12 more than 3 times the number. Find the number.

A20? -foot ladder is placed against a vertical wall of a? building, with the bottom of the ladder standing on level ground 19 feet from the base of the building. how high up the wall does the ladder? reach?

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

What is the value of x in the following equation. -x ^3/2 = -27