you can put both sides of the equation to the 4th power
![( \sqrt[4]{d - 15}) ^{4} = (2)^{4}](https://tex.z-dn.net/?f=%28%20%5Csqrt%5B4%5D%7Bd%20-%2015%7D%29%20%5E%7B4%7D%20%20%20%3D%20%282%29%5E%7B4%7D%20)


Solution:
we are given that
she wants to track to have a circumference of 150 feet.
we have been asked to find
what does the radius of the track need to be?
As we know that

Substitute the values we get

Hence radius=23.863 feet.
Step-by-step explanation:
<h3>I will be there at the same time I don't have a car so I can get my hands on your hips and I hope you have a great day and I will be<u> there</u><u> at</u><u> the</u><u> same</u><u> time</u><u> I</u><u> don't</u><u> have</u><u> a</u></h3>
Divide the seats filled by the total amount of seats of the classroom.

Multiply this result by 100 to find the percentage.

The classroom has
70% of the seats filled.