A circle has a radius of 6x⁹y⁵ cm. The area of a circle can be found using What is the area of this circle in square centimeters

Me i’m stuck on all these questions besides the two bottom ones

Which angle of rotation is an angle of rotational symmetry for all figures?

An object is accelerating at a constant rate. its velocity in feet per second as a function of time in seconds can be modeled by the linear function v(t) = 2.5t. what does the dependent variable represent for this function? a) acceleration b) distance c) slope d) velocity