The measures of the angles of a triangle are in the ratio 2: 3: 4. in degrees, the measure of the largest angle of the triangle is

An architect is designing a water fountain for a park she uses the given function to model the water jet flowing from the fountain nozzles where h(x) gives the height of the water jugs in feet x feet from the starting point h(x)=-1/20x+x+15

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?