Given the universal set U

The vet charges $45 for an office visit and $10 for each vaccination your dog needs. write an eaquation

How to do this , and can some one explain

An isosceles trapezoid with a perimeter of 42 inches. each of the congruent non parallel sides is 5 inches long, and the trapezoid is 3 inches tall. how long are the two parallel sides? a. 10 in, 22 in b. 16 in, 16 in c. 10 in, 16 in d. 12 in, 20 in