Find TanB in the trig equation

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.

Ade and abc are similar. which best explains why the slope of the line between points a and d is the same as the slope between points a and b?

Which of the following is the best first step in solving the equation below? 4+2㏒³x=17