For this question, you would simply plug in a 2 wherever you see an x and plug in a 6 wherever you see a y. Then you simplify the expression.
3(2) + 8(6) - 7
6 + 48 - 7
47
Hope this helps!
In order to find miles per hour we must first change the time given to us (57.1 seconds) into hours. We will do this by first changing the seconds to minutes:
57.1 seconds / 60 = .952 minutes
Now we can change our minutes to hours:
.952 minutes / 60= .016 hours
Now to find miles per hour we divide the miles by our time:
1 mile / .016 hours = 63.04 mph
I hope this help you