If the function w(x) = f(x) - 7 how can the graph of the function w(x) be obtained from the graph of f(x) ?

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(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.

Does the point (1, sqrt 7) lie on circle shown.