The expression 2+√3 over 2-√3 is equivalent to a: 11√3 b: 7-4√3 c: 7+4√3 d: 7+4√3/7

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.

Candy lives in the center of town. her friend darlene lives 28 miles to the east and her friend dana lives 21 miles north. approximately how far do dana and darline live apart ?

Abcd is a square. what is the measure of angle bac