What is the exact circumference of the circle?

2π cm
4π cm
8π cm
16π cm

circle with center d and diameter of 8 cm labeled.

Suppose that x and y are both differentiable functions of t and are related by the given equation. use implicit differentiation with respect to t to determine startfraction dy over dt endfraction in terms of x, y, and startfraction dx over dt endfraction .

What is the value of y? round to the nearest tenth

What could explain what happened when the time was equal to 120 minutes