Answer:
a,b
Step-by-step explanation:
Step-by-step explanation:
Inflection points are where a function changes concavity (the second derivative changes signs). At x = 4, f"(x) goes from negative to positive, so that's an inflection point. However, at x = 8, we don't know if f"(x) changes signs or not. So we can't say that that's an inflection point.
The answer is A
B and D are not answer as they show50-x=50
so x have to be 15 or 5 in A and C
but in C x=5 but 2×x+50 is nt equal to 70
so it is A