NEED HELP WITH SCREENSHOTS 17, 19, 20, 21, AND 22. ALL INFO NEEDED ARE IN SCREENSHOTS. PLEASE NUMBER ThEM AS I HAVE! THANK YOU!!!!

17 Find the intervals on which the graph of f is concave upward, the intervals on which the graph of f is concave downward, and the inflection points. F(x) = x14 + 3x2 For what interval(s) of x is the graph of f concave upward? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. (Type your answer in interval notation. Type an exact answer. Use a comma to separate answers as needed.) O B. The graph is never concave upward. For what interval(s) of x is the graph of f concave downward? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. Type your answer in interval notation. Type an exact answer. Use a comma to separate answers as needed.) O B. The graph is never concave downward. Determine the x coordinates of any inflection points of the graph of f(x). Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. (Type an exact answer. Use a comma to separate answers as needed.) O B. There are no inflection points. Click to select and enter your answer(s). Next19 An outboard motor has an initial price of $1,470. Aservice oonlract costs $200 for the rst year and increases $130 per year thereafter. The total cost of the outboard motor (in dollars) after n years is given by C(n) = 1,470 + 180" + 30n2, where n z 1. Complete parts (A) through (C). (A) Write an expression for the average cost per year. 5(n), for n years. @F (B) Graph the average cost function found in part (A). Choose the correct graph below. Oh CE 00 y/'\\ y l 4,50 8/ 4,50 51 C? x\" \\J n n 0 20 O 20 (C) When is the average cost per year minimum? (This time is frequently referred to as the replacement time for this piece of equipment.) The average cost per year is minimum after years' Click to select your answer(s). Find the absolute maximum and minimum, if either exists, for f(x) = x2 - 2x + 7. Select the correct choice below and, if necessary, ll in the answer boxes to complete your choice. 0 A. The absolute minimum is atx= O B. There is no absolute minimum, Select the correct choice below and, if necessary, ll in the answer boxes to complete your choice. 0 A. The absolute maximum is atx= O B. There is no absolute maximum. Click to select and enter your answer(s). 21 Afenoe is to be built to enclose a rectangular area of 450 square feet. The fence along three sides is to be made of material that costs $6 per foot. The material for the fourth side costs $18 per foot. Find the dimensions of the rectangle that will allow for the most eoonomical fence to be built. The short side is '1 ft and the long side is [I fL Enter your answer in each of the answer boxes. Find the equation of the cunle that passes through (2,3) if its slope is given by the following equation. 22 Enter your answer in the answer box