Select all the intervals where f(x)= −x^3 + 3x^2 + 1 is only decreasing:

2 < x < ∞

1 < x < 5

-∞ < x < ∞

0 < x < 2

-∞ < x < 1

-∞ < x < 0

5 < x < ∞

2 < x < ∞ is the only interval on which f(x) is only decreasing.

Step-by-step explanation:

The graph of f(x) shows that the only interval on which f(x) is increasing is on the interval (0, 2).

The only interval listed which contains no values between 0 and 2 is the interval 2 < x < ∞.

7 weeks

step-by-step explanation:

convert each fraction to the least common multiple of 20, so 3/4 = 15/20 & 1/10 = 2/20, then divide 15 by 2 and you get a little over 7, so the food will last 7 weeks.