Solve
(2/a+6)+(10/a+9)=(8+5)/(a^2+15a+54)

Arestaurant needs to buy thirty-seven new plates. if each box has five plates in it, how many boxes will they need to buy?

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

Bring the fraction a/a-4 to a denominator of 16-a^2