Answer:
D. 2
Step-by-step explanation:
The rate of change is also considered the slope in graph form.
In the first chart every time the t-value goes up twice the c-value goes up four times.
The same can be said for the graph on the bottom.
I am a little confused about the question you are trying to ask. It is an isosceles triangle because it has two sides of equal length.
The other angle would be...
180-2(55)=70 degrees