Make r the subject of t = 6r^2 + 6

First step, divide 6 from both sides.

t/6=r^2+1

second step, subtract 1 from both sides

t/6 -1=r^2

Now take the square root of each side.

Done!

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70