Question

A laboratory buys one pound of carbon graphite and 3 pounds of magnetite powder, which costs a total of $9.30. They spend $21.20 on 4 pounds of carbon graphite powder and 2 punds of magnetite powder. In the equations below, c represents the cost per pound of carbon graphite powder, and m represents the cost per pound of magnetite powder. c+3m= $9.30
4c+ 2m =$21.20
What is the cost per pound of carbon graphite powder?
A.) $1.60
B.) $3.20
C.) $4.50
D.) $6.10

Answer 1

Please help :/

Answer 2

Also I'm confuser on A mural is planned on a 12-inch by 18 in rectangular peice of paper. A tree drawn on the paper is 7 inches tall. The finished mural is 8 feet by 12 feet. WHat is the height of the tree on the finished mural, in inches?

Answer 3

confused*

Answer 4

Oh thanks (: