Kirana buys boxes of crackers that each has the same cost x. She represents the cost of 2 boxes of cheese​ crackers, 4 boxes of poppy seed​ crackers, and 4 boxes of plain crackers using the expression 2x+4x+4x. What equivalent expression can represent the​ cost? A. 11x
B. (2+4)4x
C. 2•4•4•x
D. 10x

Fractions can be added and subtracted only if they're fractions. a. like b. proper c. improper d. unlike

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

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?