hello!~
i know exactly what your talking about! i just took the test on ed and if you also are or just looking for the answer the answers are..
the second one, the third one, and the fifth one!
have a nice day everyone!!~
Answer:
a is the _amplitude_(Length of the blades)_
The vertical shift, k, is the _Mill shaft height_


Step-by-step explanation:
In this problem the amplitude of the sinusoidal function is given by the length of the blades.

The mill is 40 feet above the ground, therefore the function must be displaced 40 units up on the y axis. So:

We know that the blades have an angular velocity w = 3 rotations per minute.
One rotation = 
1 minute = 60 sec.
So:


Finally:
a is the _amplitude_(Length of the blades)_
The vertical shift, k, is the _Mill shaft height_


Since the distance in between each plate is 90ft. We know from home to 1st is 90ft. To get to 2nd from first is also 90ft. So 90 + 90 is 180ft.
Now this question is weird because it could be asking how far would a baseball player would have to run to get to 1st then 2nd
Or
Could be asking the distance from Home to 2nd without going to 1st. So just a straight line from home to 2nd.
If that’s the case we need to use the Pythagorean theorem
Our setup would be 90^2 + 90^2 = c^2
Adding A and B will get us 16200. Now we need to divide to get to the other side. But C is squared. So we need to Square root 16200. Which is 127.28ft.