Intermediate Algebra
posted by Raul on .
The average cab ride cost per mile(x) is given by f(x)=2x+3.50, where x is miles and f(x) is money.
A. Find the cost of a 5 mile ride.
B. Find the cost of a 3/4 mile ride.
C. How many miles can you go in $50?

A.
x = 5
f ( 5 ) = 2 * 5 + 3.50 = 10 + 3.50 = 13.50 $
B.
x = 3 / 4
f ( 3 / 4 ) = 2 * 3 / 4 + 3.50 = 6 / 4 + 3.50 = 6 / 4 + 7 / 2 = 6 / 4 + 14 / 4 = 20 / 4 = 5 $
C.
f ( x ) = 50
50 = 2 x + 3.5
50  3. 5 = 2 x
46 . 5 = 2 x Divide both sides by 2
46.5 / 2 = x
23.25 = x
x = 23.25 miles = 23 1 / 4 miles