Answer:
12
Step-by-step 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 : [tex]1.50d + 3[/tex]
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, [tex]21=1.50d + 3[/tex]
[tex]21-3=1.50d [/tex]
[tex]18=1.50d [/tex]
[tex]\frac{18}{1.50}=d [/tex]
[tex]12=d [/tex]
Thus the value of d is 12 .
