Answer:
MARIA=14
ROBERT=7
Step-by-step explanation:
<u>Now</u>
MARIA=X+7
ROBERT=X
<u>In 2 years</u>
MARIA=X+7+2=X+9
ROBERT=X+2
<u>3 years a</u>go
MARIA=X+7-3=X+4
ROBERT=X-3
<u>EQUATION</u>
X+9=4(X-3)
X+9=4x-12
X-X+9=4x-x-12
9=3x-12
3x=21
X=7
MARIA=7+7=14
I loved doing these! anyway, the answer in order would be..
2x +2
6x +6
20x +4
20x +30
4x +8
12x +6
9x
5x +15
8x +12
24x +12
and 42x +18
Your welcome ;)