The algebraic expression for 30 more than b

Treetops is selling shirts. Each adult shirt costs $20 and each child shirt costs $15. Write an algebraic expression to represent the total cost if x adults and y children buy shirts?

The length of a rectangle is 7 times the width. If the width is represented by z, then write an algebraic expression that describes the length.

The​ height, h, increased by 19 inches

Cassie and Conner are selling peaches. yesterday, Cassie sold 22 peaches. Connor sold p more peaches than Cassie. Write an algebraic expression to represent how many peaches Conner sold.