Find the area of a circle with a circumference of 50.24units

What are the soultion(s) to the quadratic equation 40- x^2=0

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.

Equation for the calculation double 2 and then add 5