Suppose that the function f(x)=7x+2 represents the number of cars that drive by in x minutes. how many cars will drive by in 10 minutes
a) 27
b) 70
c)72
d) 90

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.