What is the solution to 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?

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

The triangles in the diagram are congruent. if mzf = 40°, mza = 80°, and mzg = 60°, what is mzb?