Given that the triangles shown below are similar, what is the value of x?

What basic trigonometric identity would you use to verify that csc x sec x cot x = csc^(2)x

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.

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup