F(x)=x^2+9x+27 graphing form

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?

Petes dog weighed 30 pounds it then lost 16% of it's weight how much did pete lose