A wheel with a 20 in diameter has a circumference of 2π*(20 in) = 40π in.
For every 40π in traveled, a wheel makes one complete revolution, or turns an angle of 2π rad.
We need to convert from in to mi: there are 12 in to 1 ft, and 5280 ft to 1 mi, and so there are 12*5280 = 63,360 in to 1 mi.
We also need to convert h to min: there are 60 min to 1 h.
So we have an angular speed of
(45 mi/h) * ((2π)/(40π) rad/in) * (63,360 in/mi) * (1/60 h/min) = 2376 rad/min
As mentioned before, there are 2π rad to 1 rev, so
(2376 rad/min) * (1/(2π) rev/rad) ≈ 378.152 rev/min
(where rev/min is equivalent to rpm)
The practical rule would be, times that number, by the result of the first time you multiplied the first number. But, it would all depend by how much your're raising the number by.
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Answer:

Step-by-step explanation:
To find the slope of the two points (-9,-3) and (7, -7) w have to use the slope formula
can also be written as a decimal 
we get - 1/4 because -4 divided by -4 is 1 and -4 divided by 16 is -4
Answer:
The answer to the first question is 3*4/5*3
Step-by-step explanation:
When you cross multiply, this is the answer that you would get.