Simplify this expression: 7a/14(a+b)

Fiona races bmx around a circular dirt course. if the radius of the course is 70 meters, what is the total distance fiona covers in two laps of the race? a. about 30,772 meters b. about 15,386 meters c. about 879.2 meters d. about 439.6 meters e. about 219.8 meters23 points hurry

You decide instead to take the train there. the train will take 135 minutes. convert this into hours and minutes.

Brainlest answer can you find the area and circumference of a circle given the radius or diameter? if its yes or no explain why