AlgebraEasy–MediumEvaluating a cost function
Algebra practice question
A taxi charges a $12 base fare plus $2 per kilometre. What is the fare, in dollars, for a 9-kilometre trip?
Answer: 30
12 + 2 × 9 = 12 + 18 = 30.
Common wrong answers
- If you answered 18
- 18 is the distance charge alone, without the base fare.
- If you answered 23
- 23 adds the base fare, the rate, and the distance (12 + 2 + 9) instead of multiplying rate by distance.
- If you answered 126
- 126 multiplies (12 + 2) by 9, adding the base fare into the per-kilometre rate.
More Algebra questions
- Easy–Medium
A line passes through the points (0, 3) and (2, 7). What is the slope of the line? - Easy–Medium
A gym charges a $25 one-time signup fee plus $15 per month. Which equation gives the total cost C, in dollars,… - Easy–Medium
If 5(x − 2) = 3x + 4, what is the value of x? - Easy–Medium
A taxi charges a $3.50 base fare plus $2.25 per mile. If a ride costs $19.25 total, how many miles was the rid… - Easy–Medium
The equation of a line is 3x + 2y = 12. What is the y-coordinate of the point where the line crosses the y-axi… - Easy–Medium
A line in the xy-plane passes through the points (1, 5) and (4, 11). What is the y-intercept of the line?
Not affiliated with the College Board. SAT is a trademark of the College Board.