Evaluate the expression,
if x = 4, y = 9, and z = 7.
x(y + z - 32)

28

Step-by-step explanation:

4(9+7-3^)

28

Step-by-step explanation:

x(y + z - 3^2)

Let x=4  y=9 and z = 7

4(9 + 7 - 3^2)

Parentheses first

Exponents in the parentheses

4(9 + 7 - 9)

Add the terms in the parentheses

4(7)

Multiply

28

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations:

a. is correct