Problem-Solving and Data AnalysisEasyMeaning of a constant in a draining model
Problem-Solving and Data Analysis practice question
The equation y = 40 − 2x models the number of litres y of water left in a tank x hours after it starts draining. What does the number 40 represent?
- A. The number of litres in the tank when draining starts.Correct
- B. The number of hours until the tank is empty.
- C. The number of litres drained each hour.
- D. The number of litres left after 2 hours.
Answer: A. The number of litres in the tank when draining starts.
At x = 0, y = 40.
Why the other answers are wrong
- B. The number of hours until the tank is empty.
- The tank empties after 20 hours.
- C. The number of litres drained each hour.
- 2 litres drain each hour.
- D. The number of litres left after 2 hours.
- After 2 hours, 36 litres are left.
More Problem-Solving and Data Analysis questions
- Easy
What is 40% of 150? - Easy
A class has 25 students, and 60% of them play a sport. How many students play a sport? - Easy
A runner covers 3 kilometers. Given that 1 kilometer equals 1000 meters, how many meters is this? - Easy
What is the range of the number of hours worked by these 6 volunteers? - Easy
A shirt has a price of $24.00. A sales tax of 8% of the price is added to the price. What is the total cost, i… - Easy
If one of these 80 students is selected at random, what is the probability that the student chose Music?
Not affiliated with the College Board. SAT is a trademark of the College Board.