What is one interior angle of a regular dodecagon

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

Bring the fraction a/a-4 to a denominator of 16-a^2