Question 699282
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Nobody really cares if your Mom is yelling at you.  Just saying "I don't understand how to plug in the numbers" tells me that you simply haven't been paying attention in class and you haven't been reading your text book.  So quit wasting our time with the whiny dramatics and just post the <i>complete</i> question, what is giving you difficulty, and what you have tried so far.  For example, on this question, you say you have the equation.  So why didn't you post it?


Since you didn't give a length for a possible straight part of an oval track, I have to assume that the track is circular.  (You should have said so.  Having to guess makes me do extra work.  I shouldn't have to to extra work when I'm helping you for free.) You need to know the area of the track which is the area of a large circle with radius 200 feet plus the 20 foot width of the track - that is to say *[tex \LARGE r_1\ =\ 220] feet minus the area of the inner circle which is a circle with radius 200 feet, i.e. *[tex \LARGE r_2\ =\ 200]


The area of a circle is given by *[tex \LARGE A\ =\ \pi{r^2}]


So


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ A_{track}\ =\ A_{outer}\ -\ A_{inner}]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ A_{track}\ =\ \pi\left(r_1\right)^2\ -\ \pi\left(r_2\right)^2]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ A_{track}\ =\ \pi\left((r_1)^2\ -\ (r_2)^2\right)]


Take the value for *[tex \LARGE r_1] discussed above and put it in the indicated place.  Take the value of *[tex \LARGE r_2] discussed above and put it in the indicated place.  Replace *[tex \LARGE \pi] with 3.14.  Do the arithmetic.  Round to the nearest foot (your least precise input measurements are given to the nearest foot.)  Multiply the area of the track times $3.20.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
<font face="Math1" size="+2">Egw to Beta kai to Sigma</font>
My calculator said it, I believe it, that settles it
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