Simplify each expression by combing like terms -12+3y-9

What is the product of the radical expression. (7-2square root) (8+2 square root)

Eliza wants to make $10,000 from her investments. she finds an investment account that earns 4.5% interest. she decides to deposit $2,500 into an account. how much money will be in her account after 14 years?

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9