Of the four religions, which one did not exist in arabia before muhammad?

Which of the following was probably the most difficult challenge facing construction of the railroad?

Which of the following was a major effect of paul's conversion to christianity? christianity became the official religion of the roman empire. the teachings of christianity were banned by pontius pilate. christians began to debate whether jesus was resurrected or not. the teachings of christianity were spread to non-jews called gentiles.

If f(x) = 3x + 2 and g(x) = 2x - 2. what is (f - g)(x)?