The first, second and third term of the proportion are 42,36,35 find the forth term

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

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.

What is the value of f(x) = 2.2 for f(-2)?