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Dana buys a plant that is 4 inches tall. After one week the plant is 7 inches tall. After a second week the plant is 10 inches tall. At this rate, how tall will the plant be after the fifth week?

a
22 inches tall
b
3 inches tall
c
14 inches tall
d
19 inches tall

1 Answer

6 votes

Answer:

We know that the plant grows by 3 inches each week (7 inches - 4 inches = 3 inches, and 10 inches - 7 inches = 3 inches). Therefore, after 5 weeks, the plant will be 4 inches + (3 inches × 5) = 19 inches tall.

Explanation:

- The plant is 4 inches tall when Dana buys it.

- After one week, the plant grows by 3 inches to reach a height of 7 inches.

- After a second week, the plant grows by another 3 inches to reach a height of 10 inches.

- So, the plant grows by 3 inches each week.

- After 3 weeks, the plant will be 10 inches + 3 inches = 13 inches tall.

- After 4 weeks, the plant will be 13 inches + 3 inches = 16 inches tall.

- After 5 weeks, the plant will be 16 inches + 3 inches = 19 inches tall.

Therefore, the correct answer is d) 19 inches tall.

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