Parallel lines share the same slope. Thus, every line in the form y=(1/2)x+n will be parallel, where n is some constant.
Where is this triangle you speak of
According to the theory
b^2 = (13)^2 - (7)^2
b^2 = 169 - 49 = 120
b= root(120)
b= 10.95 cm
You do 9/10. Which here it only fits once. So this is 1 1/10. The other one fits 3 times. So its 3 1/10.
If you want the subtraction also done its 1 4/10.
Answer is B, the graph increases by about 0.28 per year
