cientists have found that the relationship between plant height and the distance between rows for a certain plant can be modeled using a quadratic function, where h(d) is the plant height and d is the listance between rows. Their data are shown in the table. Distance Between Plant Height Rows (cm) (cm) 4. 29.3 8 23.0 16 21.7 24 15.3 32 16.0 40 20.7 Which describes a key feature of h(d)? O A The maximum plant heights occur when plants are spaced between 15.3 and 16.0 cm apart. The maximum plant heights occur when plants are spaced between 24 and 32 cm apart.

A company that conducts bus tours found that when the price was $9.00 per person, theaverage number of customers was 1000 per week. When the company reduced the price to $7.00per person, the average number of customers increased to 1500 per week. Assuming that thedemand function is linear, what price should be charged to obtain the greatest weekly revenue?Revenue is price times number sold. Also find this maximum revenue.

A family plan  for a cell phone has a monthly price of $75 plus $10.99 for each additional family member added beyond the primary account holder. The linear function to model the monthly cost C(x) in ($) of a family for x additional family members added is C(x)=

Answer: A carpenter wants to make a rectangular bookcase like the one shown here. It should have a horizontal top, bottom, and middle shelf, and vertical back and two sides. The depth of the bookcase must be 1 ft, and its total volume must be 12 ft. a. Express the total surface area of the bookcase as a function of its height. Answer: b. What height and width of the bookcase will minimize its total surface area?