Simplify the expression sqrt21*(sqrt3+sqrt14)

Which expression is not a polynomial?

Part a: sam rented a boat at $225 for 2 days. if he rents the same boat for 5 days, he has to pay a total rent of $480. write an equation in the standard form to represent the total rent (y) that sam has to pay for renting the boat for x days. (4 points)

What is the equivalent fraction for the following fraction using 5 as the multiplier? 1/2