Answer:
-18
Step-by-step explanation:
Google tbh
Notice the graph, the domain is just the horizontal area "used up" over the x-axis, so, the graph goees from
![\bf -\cfrac{5x}{2}\quad to\quad \cfrac{5x}{2}\implies domain\implies \left[-\cfrac{5x}{2}\ ,\ \cfrac{5x}{2}\right]](https://tex.z-dn.net/?f=%5Cbf%20-%5Ccfrac%7B5x%7D%7B2%7D%5Cquad%20to%5Cquad%20%5Ccfrac%7B5x%7D%7B2%7D%5Cimplies%20domain%5Cimplies%20%5Cleft%5B-%5Ccfrac%7B5x%7D%7B2%7D%5C%20%2C%5C%20%20%20%5Ccfrac%7B5x%7D%7B2%7D%5Cright%5D)
the range is just, the vertical area "used up" over the y-axis, so, the graph goes to 2 and down to -2, thus
∠A must be 2*22=44 because it is made up of two times y.
A triangle's corners should add up to 180, so B and C together are 180-44=136. Divide 136 equally between B and C due to symmetry, leaves 136/2 = 68° for C