A math teacher keeps her wall-sized graph paper in a box shaped like a triangular prism. The triangular face of the prism has a
1 answer:
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Here is the equation: 
⇒
You need to get "x" by itself so minus 3 from each side
⇒ 
⇒ 
Divide 8 by 2
÷ 
x=4
So each 4 is equivalent to 4
Lets check:
⇒ 
⇒ 
So that means that Marcus practiced the piano for 4 hours and Donnel practiced for 7
You need to get "x" by itself so minus 3 from each side
Divide 8 by 2
x=4
So each 4 is equivalent to 4
Lets check:
So that means that Marcus practiced the piano for 4 hours and Donnel practiced for 7