What is the difference between the sum of 1/2 and 10 and the product of 1/2 and 10?

Which of the following parabolas opens down?

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?

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