Let a, β, y be the three interior angles of any triangle, and try to prove that cos(a+β+y) = -1.
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I dont know do your self

Step-by-step explanation:

I dont know do your self

I dont know do your self

10 b/c 5*2 =10

step-by-step explanation:

look at the picture.

y-intercept for the function on a picture is 4 → point (0, 4).

y-intercept for the function

is for x = 0. substitute:

y-intercept is 8 → point (0, 8).