What is the coefficient of x^5 y^5 in the expression of (x+y)^10

Agreeting card company can produce a box of cards for $7.50. if the initial investment by the company was $50,000, how many boxes of cards must be produced before the average cost per box falls to $10.50?

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.

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.