c - one is -4 due to that when y=0 the x coordinate shows -4, the other is when 4-x^2=0, and the square root of 4 is 2
d - x intercepts
e - it's 4 due to that 4 is shown where x=0 on the graph
f - y intercept
g - Since x>0, we do 4-x^2. x=1, and 1^2=1, so 4-1=3. 1 is x and 3 is f(x), or y, so the coordinates are (1,3)
h - Since it's <0, -1+4=3, and since 3 is the output the coordinates are (-1,3)
i - Since -3 <0, we do -3+4=1
