Could you solve the questions please? THANK YOU SO MUCH!!!

1|]. [12 Points] PRACTICE ANOTHER Suppose that the total number of units produced by a worker in t hours of an Bihour shift can be modeled by the production function PU). pm : 151 + 6t2 , t3 (a) Find the number of hours before production is maximized. (b) Find the number of hours before the rate of production is maximized. That is, find the point of diminishing returns. Need Help? 11 . [l3 Points] The figure below shows the daily sales volume 5 as a function of time t since an ad campaign began. S A f (D (a) which ofA, B, and C is the point of inflection for the graph? 0 A O B O C 0 none of these 11. [l3 Points] The figure below shows the daily sales volume 5 as a function of time t since an ad campaign began. S A f (D (a) which ofA, B, and C is the point of inflection for the graph? 0 A O B O C 0 none of these (b) On which side of c is dZS/dtz > 0 .3 0 right side O left side 0 neither (c) Does the rate of change of sales volume attain its minimum at (.7 0 Yes. S"(t) changes from negative to positive at C. 0 Yes. S"(t) changes from positive to negative at C. O No. 5"(t) changes from negative to positive at C. O No. S"(r) changes from positive to negative at C. Need Help? _ concave down (Enter your answer usrng Interval notation.) point of inflection (Enter your answers as a commaeseparated list.) X: (h) f'KX) concave up (Enter your answer using interval notation.) concave down (Enter your answer using interval notation.) p0int(s) of inflection (Enter your answers as a commaeseparated list.) X: (C) f\"(X) concave up (Enter your answer using interval notation.) concave down (Enter your answer using interval notation.) p0int(s) of inflection (Enter your answers as a commaeseparated list.) Need Help? 12. [-19 Points] PRACTICE ANOTHER A graph is given. Tell where x) is concave up, where it is concave down, and where it has points of inflection on the interval 76