Find the unknown term in each proportion.

1/3 = ?/12

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad

Find the solution of this system of equations -7x+y=-20 9x-3y=36