Answer:
ummm I think this is obvious
Step-by-step explanation:
2 circles in each group, shade in one group of 2.
I think it is 57 I just subtracted the two numbers
B. 361/4
you get: x^2-19x+361/4=(x-19/2)^2
From symmetry of sin(x) about pi/2, we know that sin(x)=sin(pi-x).
Therefore
sin(x)+sin(pi-x)=sin(x)+sin(x)=2sin(x).
