MAT250 Graded Exam 2 Questions and Answers 2023/2024 - Straighterline

MAT250 Graded Exam 2 Questions and Answers 2023/2024 - Straighterline. A man 6 feet tall is walking toward a building at the rate of 5 ft/ sec. If there is a light on the ground 50 ft from the building, how fast is the man’s shadow on the building growing shorter when he is 30 ft from the building? Select one: a. b. c. d. The correct answer is: Question 2 Correct 5.00 points out of 5.00 Question 3 Incorrect 0.00 points out of 5.00 Select one: a. 1 b. −1 c. −2 d. 0 The correct answer is: −1 Given cos (x + y) = sin x sin y, nd dy /dx by implicit differentiation. Select one: a. b. c. d. The correct answer is: Question 4 Correct 5.00 points out of 5.00 Question 5 Correct 5.00 points out of 5.00 Select one: a. b. c. d. The correct answer is: Select one: a. b. c. d. The correct answer is: Question 6 Incorrect 0.00 points out of 5.00 Question 7 Correct 5.00 points out of 5.00 A piece of wire 20 in. long is cut into two pieces, and each piece is bent into the shape of a square. What should the lengths of the two pieces be if the sum of the areas of the two squares is a minimum? Select one: a. 0 in. and 20 in. b. c. 5 in. and 15 in. d. 10 in. and 10 in. The correct answer is: 10 in. and 10 in. Select one: a. true b. false The correct answer is: true Question 8 Correct 5.00 points out of 5.00 Question 9 Correct 5.00 points out of 5.00 Compute the derivative of the function f (x) = (2x + 3) . Select one: a. 2 (2x + 3) b. 8x c. 2x + 3 d. 8x (2x + 3)