2r-6+5r=3-r+7
7r-6=10-r
7r+r=10+6
8r=16
r=16/8
r=2
Answer:
9 blue marbles
Step-by-step explanation:
12 divided by 4 = 3
3x3=9
The area is 40 because you do 12 times two then eight times two then add the awnsers
Answer:
Protractor
Step-by-step explanation:
You use a ruler to draw a straight line.
You use a protractor to draw an angle.