Question

A park ranger uses two drones to observe wildlife. After letting the drones hover at the same height for a while, she decreases the height of the first drone by 38
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feet in order to take pictures. She also decreases the height of the second drone, but only by 20% of the decrease in height of the first drone.
Which THREE methods could be used to find the change in height, in feet, of the second drone?
A
Multiply −38
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by 15.
B
Multiply −38.75 by 0.2.
C
Multiply −38 by 0.2. Then add 0.75.
D
Multiply −3834 by 110. Then multiply by 12.
E
Multiply −38 by 15. Then multiply −34 by 15. Add the products.

Answer 1

The answer to the question Which THREE methods could be used to find the change in height, in feet, of the second drone is B Multiply −38.75 by 0.2

Since the first drone decreases a height of 38 ³/₄ feet, since this is a decrease, its change in height is h =  -38 ³/₄ feet = -38.75 feet. (The value is negative because it is a decrease in height).

Also, the second drone decreases by 20 % the decrease in height of the first drone, we have that the decrease in height of the second drone, h' = h × 20 % = -38.75 × 0.2

So, to find the change in height of the second drone we multiply -38.75 by 0.2.

So, the answer to the question Which THREE methods could be used to find the change in height, in feet, of the second drone is B Multiply −38.75 by 0.2

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