If (3 + 453) (2-a)=-18-253 and the value of a

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

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)

Shirley spelled 12 of her 15 spelling words correctly on the test. what percentage did shirley get on the test?