SOLUTION: The cost of hiring a taxi is given by the formula C = 2.25d + 15 where d is the distance travelled in kilometres. (a) Find the cost of travelling 20km (b). a trip costs a pa

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Question 1204232: The cost of hiring a taxi is given by the formula C = 2.25d + 15 where d is the distance travelled in kilometres.
(a) Find the cost of travelling 20km

(b). a trip costs a passenger $87. How far did the passenger travel?
Found 2 solutions by ikleyn, math_tutor2020:
Answer by ikleyn(53763) About Me  (Show Source):
You can put this solution on YOUR website!
.
The cost of hiring a taxi is given by the formula C = 2.25d + 15 where d is the distance travelled in kilometres.
(a) Find the cost of travelling 20km
(b) a trip costs a passenger $87. How far did the passenger travel?
~~~~~~~~~~~~~~~~~ 

(a)  Substitute d = 20 kilometers into the formula.

     Get  for the cost  C = 2.25*20 + 15  dollars.

     Complete calculations on your own.



(b)  Substitute C = 87 dollars into the formula.

     Get an equation  2.25d + 15 = 87.

     From the equation, find d.

You got all necessary instructions from me.

Boldly go forward and complete the rest.



Answer by math_tutor2020(3835) About Me  (Show Source):
You can put this solution on YOUR website!

Answers:
(a) $60
(b) 32 km


Work Shown
(a)
C = 2.25*d + 15
C = 2.25*20 + 15
C = 60

(b)
C = 2.25*d + 15
87 = 2.25*d + 15
87-15 = 2.25*d
72 = 2.25*d
d = 72/(2.25)
d = 32