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Concept explainers
Exercises 57 and 58 refer to the chapter opener on page 83 Humphrey the hero deduced from the rid- die that there are twin trolls who take shifts guarding the magicaldoors One of them tells only truths, the other only lies When the troll standing guard sees Humphrey, he says
‘If truly Truthful Troll I be then go thou east and be thou free "
Humphrey needs to decide which troll he is addressing, call him by name, and tell him which door he would like opened
There are two things Humphrey must get right the name of the troll and the proper door if he misidentifies the troll, no door will be opened if he correctly names the troll and
picks the wrong door, ne will be confined to the dungeon behind it
57 3Because the troll either always lies or always tells the truth Humphrey knows that
1 if the troll is Truthful Troll then the conditional statement he uttered is true and
2 if the conditional statement he uttered is true, then he is Truthful Troll
Let p represent ‘the troll is Truthful Troll* and let q represent ‘the door to the east leads to freedom " Express the statements in (1) and (2) in symbolic form58 The conjunction of the answers from Exercise 57 is a biconditional that must be true
a Build a truth table for this biconditional.
b Use the fact that it must be true to solve Humphrey's riddle
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Chapter 3 Solutions
Mathematical Ideas (13th Edition) - Standalone book
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- Find all the values of 1-i.arrow_forward1. e² = 1+i. 2. cos z=3+ 4i Determine all complex numbers z such thatarrow_forward08:34 ◄ Classroom 07:59 Probs. 5-32/33 D ا. 89 5-34. Determine the horizontal and vertical components of reaction at the pin A and the normal force at the smooth peg B on the member. A 0,4 m 0.4 m Prob. 5-34 F=600 N fr th ar 0. 163586 5-37. The wooden plank resting between the buildings deflects slightly when it supports the 50-kg boy. This deflection causes a triangular distribution of load at its ends. having maximum intensities of w, and wg. Determine w and wg. each measured in N/m. when the boy is standing 3 m from one end as shown. Neglect the mass of the plank. 0.45 m 3 marrow_forward
- Chapter 4 Quiz 2 As always, show your work. 1) FindΘgivencscΘ=1.045. 2) Find Θ given sec Θ = 4.213. 3) Find Θ given cot Θ = 0.579. Solve the following three right triangles. B 21.0 34.6° ca 52.5 4)c 26° 5) A b 6) B 84.0 a 42° barrow_forwardLet f be a function whose graph consists of 5 line segments and a semicircle as shown in the figure below. Let g(x) = √ƒƒ(t) dt . 0 3 2 -2 2 4 5 6 7 8 9 10 11 12 13 14 15 1. g(0) = 2. g(2) = 3. g(4) = 4. g(6) = 5. g'(3) = 6. g'(13)=arrow_forwardThe expression 3 | (3+1/+1) of the following integrals? A Ов E + + + + 18 3+1+1 3++1 3++1 (A) √2×14 dx x+1 (C) 1½-½√ √ ² ( 14 ) d x (B) √31dx (D) So 3+x -dx is a Riemann sum approximation of which 5 (E) 1½√√3dx 2x+1arrow_forward
- Examine the Variables: Carefully review and note the names of all variables in the dataset. Examples of these variables include: Mileage (mpg) Number of Cylinders (cyl) Displacement (disp) Horsepower (hp) Research: Google to understand these variables. Statistical Analysis: Select mpg variable, and perform the following statistical tests. Once you are done with these tests using mpg variable, repeat the same with hp Mean Median First Quartile (Q1) Second Quartile (Q2) Third Quartile (Q3) Fourth Quartile (Q4) 10th Percentile 70th Percentile Skewness Kurtosis Document Your Results: In RStudio: Before running each statistical test, provide a heading in the format shown at the bottom. “# Mean of mileage – Your name’s command” In Microsoft Word: Once you've completed all tests, take a screenshot of your results in RStudio and paste it into a Microsoft Word document. Make sure that snapshots are very clear. You will need multiple snapshots. Also transfer these results to the…arrow_forwardQ4*) (make sure you first understand question P5) Discuss the extremisation of the integral I = = √(2(y + 2) ³y' + (x − 7)) c You may find point (iv) in § 3.5 relevant. dx.arrow_forwardQ6*) Describe the plane paths of light in the two-dimensional media in which the light velocities are given respectively by (a) c = a/y, (b) c = a/√y, where a > 0, y > 0.arrow_forward
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