How do you divide two functions and then write the domain in interval or union of intervals

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.

A(1,1) b(-3,0) c(-4,-1) d(3,-2) drag it to correct position