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Maths Week 1: the start of the relation ladder
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Maths Week 1: the start of the relation ladder

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# Week 9 - Graded Assignment 9 > **Course:** Jan 2026 - Mathematics I > Week 9 - Graded Assignment 9 > **Last Submitted:** You have last submitted on: 2026-04-17, 05:42 IST --- ## Introduction Suppose $f_1(x)= x^3$ and $f_2(x)=x$ denote the profits of Company A and Company B, respectively, throughout 1 year (the beg...

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Week 9 - Graded Assignment 9

Course: Jan 2026 - Mathematics I
Week 9 - Graded Assignment 9
Last Submitted: You have last submitted on: 2026-04-17, 05:42 IST

Introduction

Suppose f1(x)=x3f_1(x)= x^3 and f2(x)=xf_2(x)=x denote the profits of Company A and Company B, respectively, throughout 1 year (the beginning of the year is denoted by x=0x=0 and the ending denoted by x=1x=1). The predicted profits of Company A and Company B in the same year are given by the functions g1(x)=xg_1(x)=\sqrt{x} and g2(x)=exg_2(x)=e^x, respectively. The curves represented by the functions f1f_1 and g1g_1 are shown in Figure M2W3G2, and the curves represented by the functions f2f_2 and g2g_2 are shown in Figure M2W3G3.
Markdown Image
Suppose the area of the region bounded by the two curves (the original curve and the predicted curve) in the interval  [0,1][0,1]is defined to be the error in prediction.
 Using the information above, answer the following questions.

Question 1

Match the functions in Column A with the corresponding (signed) area between its graph and the interval [1,1][-1,1] on the X-axis in column B and the images of their graphs and the highlighted region corresponding to the area computed in Column C, given in Table M2W3G1.
Markdown Image
  • i) \rightarrow b) \rightarrow 1), iii) \rightarrow a) \rightarrow 2).
  • i) \rightarrow b) \rightarrow 3), ii) \rightarrow c) \rightarrow 1).
  • ii) \rightarrow c) \rightarrow 1), iii) \rightarrow a) \rightarrow 2).
  • i) \rightarrow b) \rightarrow 1), ii) \rightarrow c) \rightarrow 3), iii) \rightarrow a) \rightarrow 2).
Feedback/Explanation: i) \rightarrow b) \rightarrow 3), ii) \rightarrow c) \rightarrow 1).
ii) \rightarrow c) \rightarrow 1), iii) \rightarrow a) \rightarrow 2).
Accepted Answers:
i) \rightarrow b) \rightarrow 3), ii) \rightarrow c) \rightarrow 1).
ii) \rightarrow c) \rightarrow 1), iii) \rightarrow a) \rightarrow 2).

Question 2

A cylinder of radius xx and height 2h2h is to be inscribed in a sphere of radius RR centered at O as shown in Figure M2W3G1
                                      
Markdown Image
The volume of such a cylinder is given by V=2πx2hV=2\pi x^2 h and the surface area of the outer curved surface is given by S=4πxhS=4 \pi x h. Choose the set of correct options.
  • The cylinder has maximum volume amongst all cylinders which can be inscribed when h=Rh= R.
  • The cylinder has maximum volume amongst all cylinders which can be inscribed when h=3Rh= \sqrt{3}R.
  • The cylinder has maximum volume amongst all cylinders which can be inscribed when h=R3h= \frac{R}{\sqrt{3}}.
  • The cylinder has maximum surface area of its curved surface, amongst all cylinders which can be inscribed, when h=2Rh=2R.
  • The cylinder has maximum surface area of its curved surface, amongst all cylinders which can be inscribed, when h=R2h=\frac{R}{\sqrt{2}}.
  • The cylinder has maximum surface area of its curved surface, amongst all cylinders which can be inscribed, when h=2h=\sqrt{2}.
Status: Yes, the answer is correct. Score: Score: 1
Feedback/Explanation: The cylinder has maximum volume amongst all cylinders which can be inscribed when h=R3h= \frac{R}{\sqrt{3}}.
The cylinder has maximum surface area of its curved surface, amongst all cylinders which can be inscribed, when h=R2h=\frac{R}{\sqrt{2}}.
Accepted Answers:
The cylinder has maximum volume amongst all cylinders which can be inscribed when h=R3h= \frac{R}{\sqrt{3}}.
The cylinder has maximum surface area of its curved surface, amongst all cylinders which can be inscribed, when h=R2h=\frac{R}{\sqrt{2}}.

Question 3

Which of the curves in the following figures enclose a negative area on the XX axis in the interval [0,1][0,1]?
Markdown Image
  • Curve 1
  • Curve 2
  • Curve 3
  • Curve 4
Feedback/Explanation: Curve 2
Curve 4
Accepted Answers:
Curve 2
Curve 4

Question 4

What will the absolute difference between the minimum values of f2f_2 and g2g_2 in the interval [0,1][0,1] be?
Your Answer: 1
Status: Yes, the answer is correct. Score: Score: 1
Feedback/Explanation: (Type: Numeric) 1
Accepted Answers:
(Type: Numeric) 1

Question 5

Choose the correct options from the following.
  • The error in prediction for company A is 512\frac{5}{12}.
  • The error in prediction for company A is 1112\frac{11}{12}.
  • The error in prediction for company A is more than that for company B.
  • The error in prediction for company B is more than that for company A.
  • The error in prediction for Company A and Company B, cannot be compared using the given information.
Status: Yes, the answer is correct. Score: Score: 1
Feedback/Explanation: The error in prediction for company A is 512\frac{5}{12}.
The error in prediction for company B is more than that for company A.
Accepted Answers:
The error in prediction for company A is 512\frac{5}{12}.
The error in prediction for company B is more than that for company A.

Question 6

Let f(x)=x33x+14f(x)=x^3-3x+14. What is the local minimum value of ff attained at a critical point?
Your Answer: 12
Status: Yes, the answer is correct. Score: Score: 1
Feedback/Explanation: (Type: Numeric) 12
Accepted Answers:
(Type: Numeric) 12

Question 7

Let f(x)=28x2+12,0x6f(x) = 28x^{2} + \frac{1}{2}, \quad 0 \le x \le 6. The estimated area obtained by dividing the interval into 3 sub-intervals of equal length and using the left endpoints of the sub-intervals for the height of the rectangles is (in square units).
Your Answer: 1123
Status: Yes, the answer is correct. Score: Score: 1
Feedback/Explanation: (Type: Numeric) 1123
Accepted Answers:
(Type: Numeric) 1123

Question 8

Let
f(x)={5x+40x10x210<x20f(x)=\begin{cases} -5x+ 4 & 0 \leq x \leq 10 \\x^2 & 10< x \leq 20 \end{cases}
What is the global minimum of ff on [0,20][0,20]
Your Answer: -46
Status: Yes, the answer is correct. Score: Score: 1
Feedback/Explanation: (Type: Numeric) -46
Accepted Answers:
(Type: Numeric) -46

Question 9

If xy=62x-y=62, find the least value of 2xy2xy.
Your Answer: -1922
Status: Yes, the answer is correct. Score: Score: 1
Feedback/Explanation: (Type: Numeric) -1922
Accepted Answers:
(Type: Numeric) -1922

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