Which types of lines match these equations y=4x 3x+2y=10

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g

Need solving this 2nd limit problem.