Question

A cab company calculates cab fares using the expression 1.50d + 3, where d is the distance traveled in miles. If a passenger has to pay a $21 fare for a ride, which number from the set {9, 12, 15, 18} is the value of d?

Answer 1

12

Explanation:

Answer 2

12

Explanation:

Given : A cab company calculates cab fares using the expression 1.50d + 3, where d is the distance traveled in miles.

To Find: If a passenger has to pay a $21 fare for a ride, which number from the set {9, 12, 15, 18} is the value of d?

Solution:

Cab fare Expression :
`1.50d + 3`

Where d is the distance traveled in miles.

Now we are given that a passenger has to pay a $21 fare for a ride

So,
`21=1.50d + 3`

`21-3=1.50d`

`18=1.50d`

`(18)/(1.50)=d`

`12=d`

Thus the value of d is 12 .