Is 2x + 5 a factor of 12x4 + 30x3 + 8x2 + 4x - 40? Explain your reasoning

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?

Which of the following is not a subset of {1,2,3}?

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?