A company makes concrete bricks that are shaped like rectangular prisms. each brick is 5 inches long, 4inches wide, and 2 inches tall. how much concrete will they need for to make 1600 bricks?

Step-by-step explanation:

l = 5 inches

b = 4 inches

h = 2 inches

Volume of a brick = lbh

= 5* 4 * 2

= 40 cubic inches

Concrete needed to make 1600 bricks = 1600 * 40

                                                                 =  64000 cubic inches

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: