The directions to knit a blanket say to buy an extra 15% of yarn to account for error. Chloe needs 7.5 yards of yarn to make the blanket. How much yarn should she buy? PLEASEEE HELP !!!

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.

Elena and her husband marc both drive to work. elena's car has a current mileage (total distance driven) of 15,000 and she drives 23,000 miles more each year. marc's car has a current mileage of 46,000 and he drives 9,000 miles more each year. will the mileages for the two cars ever be equal? explain.

5x−4≥12 or 12x+5≤−4 can you with this problem