Which of the following is an equation of a circle in

the $x y$ -plane with center $(0,4)$ and a radius with

endpoint $\left(\frac{4}{3}, 5\right) ?$

$$\begin{array}{l}{\text { A) } x^{2}+(y-4)^{2}=\frac{25}{9}} \\ {\text { B) } x^{2}+(y+4)^{2}=\frac{25}{9}} \\ {\text { C) } x^{2}+(y-4)^{2}=\frac{5}{3}} \\ {\text { D) } x^{2}+(y+4)^{2}=\frac{3}{5}}\end{array}$$

## Discussion

## Video Transcript

And so for this one, we want to know how many times after it was dropped was the ball at a height of two feet, so we won't know at a height of two feet. Well, two feet is here. We can draw this line all the way across and see how many times the ball across that two line point. It's kind of like if you were taking like, a little ribbon and you had it at two feet and you see how many times the ball crosses that as it goes up, down and up and down, up and down. Well, for here, across this once, twice, three times so you know it's gonna be C three times.

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