In a class, every student knows French or German (or both). 15 students know French, and 17 students know German.
2 answers:
You might be interested in
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