Help r Wlllred 3mm. (wlred smilh@snhu edu) r Lagout mdoms 5.3.1.th - as... 7 MATJAOVJZLWW ZZEWZ Frecalclllus Module Two 271 Discussion SerfaceArea 2-1 Discussion: Surface Area Remaining Time Unlimited Module Two Discussion v ' Module Two Discussion Question: Solve the problem below. For your initial post in Brightspace. copy the description of your cylinder in the box below and then enter your solution to all three parts (parts a, b. and c) of the problem. To copy the description of your cylinder. highlighting and using "copy" from here in Mobius and then using \"paste" into Brightspace should work. Hint: This is similar to Question 63 in Section 5.7 of our textbook. We covered this section in "l 4 Reading and Participation Activities: Inverses and Radical Functions" in Module One. You can check seine of your answers to parts b and c to make sure that you are on the right track. The height of the cylinder is 6 inches. We'll be analyzing the surface area of a round cylinder - in other words, the amount of material needed to \"make a can\". A cylinder (round can) has a circular base and a circular top with vertical sides in between. Let r be the radius of the top of the can and let h be the height. The surface area of the cylinder. A. is A : 27r'r'2 + 2wh (two circles, one for the top and one for the bottom plus a rolled up rectangle for the sides). r_ = radius 0.. Areas = I r5 h : "Bight ~. - \"'6' = \"'2'\" r, _ 7 _ . Circumference 21ft Part .1: Assume that the height of your cylinder is 6 inches. Consider A as a function of 7'. so we can write that as A (7') : 2 7r7'2 + 12 rrr'. What is the domain of A (1')? In other words. for which values of 7' is A (1') dened? Part b: Continue to assume that the height of your cylinder is 6 inches. Write the radius 7' as a function of A. This is the inverse function to A (7'), i.e., to turn A as a function of 7' into r as a function of A. MA): @BD Hints: - To calculate an inverse function. you need to solve for 1'. Here. you would start with A = 2 #72 + 12 7r7'. This equation is the same as 2 71'7'2 + 12 7r?" 7 A = 0 which is a quadratic equation in the variable 7. and you can solve that using the quadratic formula. You Will want to keep A as a variable when you plug the values into the quadratic formula 3 7:31 in Mobius, in text mode you can type in (3*pi+l)/(x+l). There is more infonnation in the Introduction to Mobius unit. - If you want to type in Part c: If the surface area is 225 square inches. then what is the radius 7"? In other words, evaluate 7' (225). Round your answer to 2 decimal places Hint: To compute a nLuneric square root such as \\/ 17.3, you could - Use a spreadsheet such as Microsoft Excel or OpenOffice Calc and type in :sqrt(l7.3) - Use a browser to connect to the Internet and type in sqrt( 173) into a search eld - Use a calculator The radius is \ umber inches if the surface area is 225 square inches. How Did | Do? Try Another Quit & Save Previous Unit llem Next Unil Item