Free ACT Modeling practice questionsEnhanced ACT, 2026 format
Build or interpret an equation that models a described situation, then use it to predict a value or explain what a number in the model means.
Answer each question, then read why the right answer is right and why the tempting one is wrong.
Question 1
A researcher plots the number of hours students slept before an exam (x) against their exam scores (y) and finds the line of best fit y = 6.5x + 41. One student slept 7 hours and scored 92. What is the difference between this student's actual score and the score predicted by the line?
Question 2
A tree was 6 feet tall when it was planted and 11 feet tall 4 years later. Assuming the tree grows at a constant rate, which of the following expressions gives the height of the tree, in feet, t years after it was planted?
Question 3
A car was bought for $24,000. Its value decreases by 15% of its value at the start of each year. To the nearest dollar, what is the value of the car 3 years after it was bought?
Want Modeling at your level, every day?
The app has hundreds more ACT questions, serves them at the difficulty you are ready for, and brings back the ones you miss until they stick. Start with a free diagnostic and a projected score range.