day 1: 17
day 2: 21
day 3: 25
day 4: 29
day 5: 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 find out how many sit-ups Marla will do on Day 12, we first need to determine the pattern in the increase of sit-ups 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.
We can see that there is a consistent increase of 4 sit-ups each day. Therefore, to find out how many sit-ups she will do on Day 12, we can calculate:
Day 12: 17 + (12-1) * 4
= 17 + 44
= 61
Therefore, Marla will do 61 sit-ups on Day 12.