Jack got a grade of 80% on his first quiz and 92% on his second quiz. What grade(s) would he need to get on his third quiz to have an average of at least 87%? Write the inequality and solve.

Solve for x by completing the square. 2x^2-4x+7=0

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .