Answer:
A, B, C, and G
Explanation:
f(0)=75 is true because that's the y-intercept
f(30)=100 is true
f(20)=175 is true
f(0)=0 is not true because we already identified f(0) as 75
f(x)=100 when x=20 is not true because we already identified f(20) as 175
f(10)<f(5) is not true because looking at the graph, f(10)>f(5)
f(10)=f(15) is true because the graph is constant between the two points