Answer:
Step-by-step explanation:
There is no solution
Answer: There is no such value of X.
If you get this wrong, im sorry but im sure that its the right answer.
See explanation below
a. f(x) is increasing at (-∞, 1] and [7, ∞) because f'(x) is positive at those intervals.
b. f(x) is concave up at [4, ∞) because the slope of f'(x) or f''(x) is positive.
