Find the selling price of each item: costs of an oil change is $18.00 and the markup is 70%

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles. i'm desperate.

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

Jane’s favorite fruit punch consists of pear, pineapple, and plum juices in the ratio 5: 2: 3. chapter reference how much punch can she make if she has only 6 cups of plum juice?