What's the answer for 0.2(x+50)-6=0.4(3x+20)

What is the range of this function? all real numbers such that y ≤ 40 all real numbers such that y ≥ 0 all real numbers such that 0 ≤ y ≤ 40 all real numbers such that 37.75 ≤ y ≤ 40

Classify the following triangle check all that apply

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)