Y=3x-2
y=3(4)-2
y=12-2
y=10
I hope this helps.
It is 2.56 because per pound equals the amount
If you want to know how fast the professional runner is going, you need to multiply 3 1/3 by 1 1/4 since the professional is 1 1/4 times faster. So, your answer is 4 1/6.