Evaluate the expression for the given value of x.

2x + 3 for x = 4
−5x + 7 for x = −2
1.5x − 3.5 for x = 9
0.3x + 9.7 for x = −2

-3/4 x + 10 for x = −4

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?