What is the coefficient in the expression y/8+15?

Suzanne began a trip with 18 1/2 gallons of gas in the gas tank of her car if she hughes 17 3/4 gallons on the trip how many gallons does she have left once she finish the trip

To factor 4x2-25, you can first rewrite the expression as:

What number should be added by both sides of the equation to complete the the square? x^2-10x=7