Eleven diminished by 5 times a number is the same as 4 times the number increased by 20.

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

This is so hard and it’s for a test

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.