Find the percent of change. original: 80, new: 64

Combine the information in the problem and the chart using the average balance method to solve the problem.

Frank has a devised a formula for his catering business that calculates the number of meatballs he needs to prepare. the formula is m=4a+2c, where c=number of children; m=number of meatballs; a=number of adults. how many meatballs are required for a party of 10 adults and 5 children?

In a rectangle klmn, km = 6x + 16 and ln = 49. find the value of x