Question

A hummingbird beats its wings 600 times a minute while flying. If it drinks nectar from a flower, it beats its wings an

additional 120 times per flower. If the hummingbird drinks from 4 flowers, what expression could be used to determine
how many times the hummingbird beats its wings?
(A) 600x + 480, where x is the number of minutes of flying
(B) 600x + 480x, where x is the number of minutes of flying
(C) 600x + 120x + 480, where x is the number of flowers
(D) 600 + 120x, where x is the number of flowers
(E) 600 + 480x, where x is the number of flowers

Answer 1

A

Explanation:

the only variable in this scenario is the number of minutes flying. we don't know this, so we have to keep it variable.

but we do know the extra wing-beats for the 4 flowers it visits : 4 × 120 = 480

this we have to add to the variable part.

so,

600x + 480 is the correct answer.

Answer 2

A

Explanation:

A is the only one correct.

It beats already 600 per minute: x. So 600x.

Also since they did 4 flowers, 4*120 is 480 so 600x+480.