Answer:
The radius of the Ferris wheel is 
Step-by-step explanation:
we know that
The circumference of a circle is equal to

we have

substitute

Solve for r

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Answer:
Step-by-step explanation:
Given Curve passes through 
Also the slope of the curve at every point p is twice the Y-coordinate of p
Let the coordinate of p be
Therefore


Integrating both sides


Substituting values



I wasn't sure how to order things, so I decided to write directly on top of your screenshots. Have a look at the three attachments. Two of which are correct. There is one incorrect answer though you're fairly close.