Answer:
The correct option is A
A) -2x + 60 < 6
Explanation:
We know that a paper airplane is thrown at a height of 60 feet.
We can consider 60 feet as the maximum height
Then the paper airplane decends at at rate of 2 feet/seconds
Which means that:
In 1 second, it decends 2 feet
In 2 seconds, it decends 4 feet
In 3 seconds, it decends 6 feet
As the descending of plane is always 2 time the time, we can write the function for descending as
Descended height (feet) = 2x
As the plane is descending continuously, we can find the height at each seconds. For that, we'll have to subtract the descended height from the maximum height.
New height (feet) = Max height - descended height = 60 - 2x
This will give us the New height at any time 't'
Given the condition in question, we have to find the equation for which the New height becomes less than 6, so the equation becomes:
60 - 2x < 6
or rearrange
-2x + 60 < 6