If you have $30 and the ratio is 3:7, what does the 7 represent?

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

Quadrilateral abcd in the figure below represents a scaled-down model of a walkway around a historic site. quadrilateral efgh represents the actual walkway. abcd is similar to efgh. what is the total length, in feet of the actual walkway?

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.