Answer:
Below in bold.
Step-by-step explanation:
He is running at 40/5 = 8 feet per second.
This is 8 * 3600 feet per hour as there are 3600 seconds in an hour.
In miles this is 8*3600 / 5280 miles ( there is 5280 feet in a mile.
So it is 28800/5289
= 5.45 miles per hour.
12 x 40 = 480 feet per minute.
480 x 60 = 28800 feet per hour.
28800/5280 = 5.45 miles per hour.
Hope that helps.Thank you!!!
approximately 41.67%
12
x^2 - a
If a is a perfect square we could factor
x^2 - b^2 = (x-b)(x+b)
So a cannot be 36,49,81 since they are perfect squares
a must be 12
