Mario is tracking the progress of his plant's growth. After 3 days the plant was 5 cm high. 9 days later the plant was 18.5 cm tall. What is the rate of growth of the plant?
How tall was the plant when Mario planted it?
How tall will the plant be after 20 days?
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1. The plant seems to be growing approximately 4.5 cm every 3 days.

2. around 0.5 cm.

3.  It should be 30.5 cm

   Step-by-step explanation:

1.  18.5 - 5 = 13.5

13.5 represents the amount of growth it had throughout those 9 days. To find  out the consistent, you would have to find out how many cm it grows every 3 days.

So you would divide 13.5 by 3.

13.5 / 3 = 4.5

2. Since we know how much it grows every 3 days, and it was 5 cm after 3 days of him having it you would subtract 4.5 from 5.

5 - 4.5 =0.5

3. we already know how tall it would be at 12 days, 18.5. And since we know how tall it will grow every 3 days, 4.5. You would add it until right before you get to 20.

Day 15: 23 cm

Day 18: 27.5 cm

Since we can't add 4.5 anymore, because give you the height at 21 days instead of 20.

Divide 4.5 by 3, since that's how many days it would take to grow.

4.5 / 3 = 1.5

1.5 represents how much it grows everyday. So multiply it by 2 and then add it to the 18th day.

1.5 * 2 = 3

27.5 + 3 = 30.5

That's it.

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