-3x + 3 < 6 <em>subtract 3 from both sides</em>
-3x < 3 <em>change the signs</em>
3x > -3 <em>divide both sides by 3</em>
<h2>x > -1</h2>
His average speed is 40mph you get your answer by dividing 80 by 2, or or you could do what is half of 80 which is 40. So Mr.Campbell average speed is 40mph
Answer:
1) When r = 2, M = 20.
2) When M = 540, r = 6.
Step-by-step explanation:
M is a directly proportional to r cubed
This means that the equation for M has the following format:

In which a is a multiplier.
When r=4 M=160.
We use this to find a. So





So

1) work out the value of M when r=2

When r = 2, M = 20.
2) work out the value of r when M=540




![r = \sqrt[3]{216}](https://tex.z-dn.net/?f=r%20%3D%20%5Csqrt%5B3%5D%7B216%7D)

When M = 540, r = 6.