Day 1 Day 2 Day 3 Day 4 Day 5
17 21 25 29 33
The table shows how the number of sit-ups Marla does each day has changed over time. At this rate, how many sit-ups will she do on Day 12? Explain your steps in solving this problem.
To determine how many sit-ups Marla will do on Day 12, we first need to identify the pattern of increase in the number of sit-ups she does each day.
From Day 1 to Day 2, there is an increase of 4 sit-ups.
From Day 2 to Day 3, there is an increase of 4 sit-ups.
From Day 3 to Day 4, there is an increase of 4 sit-ups.
From Day 4 to Day 5, there is an increase of 4 sit-ups.
This shows that there is a consistent increase of 4 sit-ups each day.
To find out how many sit-ups Marla will do on Day 12, we can calculate the difference between Day 1 and Day 12:
Day 12 is 7 days after Day 5.
7 days x 4 sit-ups/day = 28 sit-ups
To find the total number of sit-ups on Day 12, we add the 28 sit-ups to the number of sit-ups on Day 5:
33 sit-ups on Day 5 + 28 sit-ups = 61 sit-ups on Day 12
Therefore, Marla will do 61 sit-ups on Day 12.