Chapter 1.3, Problem 71E

Early Monday morning, the temperature in the lecture hall has fallen to 40°F, the same as the temperature outside. At 7:00 A.M., the janitor turns on the furnace with the thermostat set at 72°F. The time constant for the building is = 3 hr and that for the building along with its heating system is 1 K A.M.? When will the temperature inside the hall reach 71°F? 1 = 1 hr. Assuming that the outside temperature remains constant, what will be the temperature inside the lecture hall at 8:30 2 At 8:30 A.M., the temperature inside the lecture hall will be about (Round to the nearest tenth as needed.) 1°F.

Find the maximum volume of a rectangular box whose surface area is 1500 cm² and whose total edge length is 200 cm. cm³

Find the minimum cost of a rectangular box of volume 120 cm³ whose top and bottom cost 6 cents per cm² and whose sides cost 5 cents per cm². Round your answer to nearest whole number cents. Cost = cents.

Find the absolute extrema of the function f(x, y) = x² + y² - 3x-3y+3 on the domain defined by x² + y² <9. Round answers to 3 decimals or more. Absolute Maximum: Absolute Minimum:

Find the maximum and minimum values of the function f(x, y) = e² subject to ï³ + y³ = 128 Please show your answers to at least 4 decimal places. Enter DNE if the value does not exist. Maximum value:

A chemical manufacturing plant can produce x units of chemical Z given p units of chemical P and 7 units of chemical R, where: z = 140p0.6,0.4 Chemical P costs $300 a unit and chemical R costs $1,500 a unit. The company wants to produce as many units of chemical Z as possible with a total budget of $187,500. A) How many units each chemical (P and R) should be "purchased" to maximize production of chemical Z subject to the budgetary constraint? Units of chemical P, p = Units of chemical R, r = B) What is the maximum number of units of chemical Z under the given budgetary conditions? (Round your answer to the nearest whole unit.) Max production, z= units

A firm manufactures a commodity at two different factories, Factory X and Factory Y. The total cost (in dollars) of manufacturing depends on the quantities, and y produced at each factory, respectively, and is expressed by the joint cost function: C(x, y) = x² + xy +4y²+400 A) If the company's objective is to produce 1,900 units per month while minimizing the total monthly cost of production, how many units should be produced at each factory? (Round your answer to whole units, i.e. no decimal places.) To minimize costs, the company should produce: units at Factory X and units at Factory Y B) For this combination of units, their minimal costs will be enter any commas in your answer.) Question Help: Video dollars. (Do not

use Lagrange multipliers to solve

Suppose a Cobb-Douglas Production function is given by the following: P(L,K)=80L0.75 K-0.25 where L is units of labor, K is units of capital, and P(L, K) is total units that can be produced with this labor/capital combination. Suppose each unit of labor costs $400 and each unit of capital costs $1,600. Further suppose a total of $384,000 is available to be invested in labor and capital (combined). A) How many units of labor and capital should be "purchased" to maximize production subject to your budgetary constraint? Units of labor, L = Units of capital, K = B) What is the maximum number of units of production under the given budgetary conditions? (Round your answer to the nearest whole unit.) Max production = units