13. ALGEBRA If 20 and 2D are supplementary, and the measure of 2D is 45°, what is the measure of 20?

For how answer my question this will be the last question can you answer in math subject

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

What is the location of point g, which partitions the directed line segment from d to f into a 5: 4 ratio? –1 0 2 3