8 + 4a I need an answer pronto this was the one part of math I was taught the least.
a=1/2

Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 seconds

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

How can you tell when x and y are not directly proportional?