<span>subtract 2 from the number of sides, and multiply the difference by 180</span>
Answer:4\left(1-4r\right)+5\left(r-7\right)=-11r-31
Step-by-step explanation:
If you would like to know the average rate in miles per hour, you can calculate this using the following steps:
420 miles ... 210 minutes
x miles = ? ... 1 hour = 60 minutes
420 * 60 = 210 * x
x = 420 * 60 / 210
x = 120 miles
The correct result would be 120 miles per hour.