Answer:
Use the inflection points to set up intervals. Substitute a value into each interval to find where the curve is concave up or down.
The graph is concave up
A. -6/7
Because:
(2,6) (8,-1)
(x1,y1) (x2,y2)
x1 = 2. Y1=6. X2=8. Y2= -1.
Equation for slope is m = y2-y1
x2-x1
-1-6 = -7
8-2=6
Here is the answer to the question. Hope this helps!
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Given that sinA = y / r, where y is opposite, and r is hypotenuse,
sinA = DE / DF.