Acombination of numbers and operations is called a

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.

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a

Find all the angles that satisfy the equation cos(θ)=32