Solve using the quadratic formula. Show all work. Write each solution in simplest form. No decimals.

Which expression is the factorization of x^2+10+21

How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid in order to get a 40% solution of acid?

Of of at a : $6, $8, $7, $6, $5, $7, $5, $7, $6, $28, $30 is?ato .ato .ato .ato .