C. 2:3 because the original ratio is 12:18, but to complete this ratio you would need to simplify the ratio to 2:3.
12.
13.
16.
is already in simplest form.
X intercepts are where y=0
0=x^2+1x-42
0=(x-6)(x+7)
set to zero
x-6=0
x=6
x+7=0
x=-7
x intercepts are (-7,0) and (6,0)
y intercept is where x=0
y=0^2+0-42
y=-42
y intercept is (0,-42)
x intercepts at (-7,0) and (6,0)
y intercept at (0,-42)
I think it's 84.1 (degrees). Hope this helps you