Fitness programme

This task is about algebraic expressions to describe patterns.
illustration: woman doing exercise
Lia began a keep-fit exercise programme. In the first week, she exercised for 20 minutes daily.
Every week after that she added an extra 5 minutes of exercise time. In the second week she exercised for 25 minutes daily; for the third week for 30 minutes, and so on.

Question 2Change answer

a)  How many minutes exercise would she be doing in the 6th week?
 minutes per day

Question 2Change answer

b)  How many minutes will she be exercising daily in the 12th week?
 minutes per day

Question

c)  Which of these expressions describes how many minutes she would be exercising after x weeks?

    • 20x

    • 15 + x

    • 15 + 5x

    • 20 + 5x

    • 25x

Question 2Change answer

d)  Explain why this exercise programme would be impossible to do over a long time.