Question

The expression 1.5t + 20 predicts the height in centimeters of a plant t days from today. What is the predicted height of the plant 5 days from today?

Answer 1

1.5 times 5= 7.5
Therefore, 7.5 + 20 = 27.5
The predicted height will be 27.5 centimeters after 5 days.

Answer 2

Given: The expression 1.5t + 20 predicts the height in centimeters of a plant t days from today.

To find: Predicted height of the plant 5 days from today

Solution: Here, the expression which predicts the growth rate is : 1.5t + 20.

Here, t stands for the number of days that have gone by.

For example: After 1 day, t = 1. Height will be calculated as:

1.5 t + 20

Putting t= 1 here,we get height after 1 day as:

1.5 × 1 + 20

= 1.5+20

= 21.5 cm

Similarly after 5 days, t is equal to 5. For finding the height of the plant after 5 days, we simply put t=5 in the expression.

Height of the plant after 5 days

= 1.5 × 5 + 20 cm

= 7.5+20 cm

= 27.5 cm

Therefore, the height of the plant after 5 days is 27.5 cm.