Help :(
how do I do this?

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?