Expressions + equations 1. 10 less than a number

2. The quotient of a number and 15 is 40

3. The quotient of a number and 3 is 11

4. a number subtract 3

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.