Perimeter, Area, Volume

20. Marcos programs his calculator to evaluate a linear function, but he doesn't say what the function is. When 5 is entered, the calculator displays the value 2. When 15 is entered, the calculator displays the value 6. Which of the following expressions explains what the calculator will display when any number, n, is entered?

2017 December(A10) Math Question 20

21. On Friday, the temperature at 8:00 a.m. was 49°F and rose at a constant rate of °F per hour until noon. A cold front passed through at noon, and the temperature then fell at a constant rate of 1°F per hour. The temperature first fell below 49°F between:

2017 December(A10) Math Question 21

55. Which of the following is equivalent to the sum of any 3 consecutive odd integers, x, y, and z, such that x < y < z ?

Perimeter, Area, VolumeACT math questions

2017 December(A10) Math Question 20

2017 December(A10) Math Question 21