# Complex numbers Questions and Answers

Algebra

Complex numbersSimplify assuming that M N and Kare n x n invertible matrices MK T NMT 1 1 5KTN 1 1

Algebra

Complex numbersStudy the following scenario Stanley has a job that pays 45 000 a year that requires he work 45 hours a week How much money is Stanley paid per week O 3700 O 450 937 50

Algebra

Complex numbersIn a certain year Congress began debating a new health care bill A poll of 1000 Americans at the time indicated that 422 opposed the bill 280 favored the bi and 298 were not sure Based on these results assume you ask a randomly selected American this question Express your answers as exact decimals Part 0 2 Part 1 of 2 a What is the probability that a randomly selected American was in favor of the bill The probability that a randomly selected American was in favor of the bill was Part 1 2 Part 2 of 2 b What is the probability that a randomly selected American was not in support of the bill mbr selected American was not in support of the bill was X

Algebra

Complex numbersHow many different ID cards can be made if there are three digits on a card and no digit can be used more than once What if digits can be repeated Part 1 of 2 There are Part 2 of 2 different ID cards that can be made if no digit can be used more than once X

Algebra

Complex numbersIn my Tae Kwon Do class there a black belt four red belts one blue belt two green belts and four yellow belts If the sensei selects a student at random to lead the warm up find the probability as a reduced fraction that the person is Part 0 3 Part 1 of 3 a Either a green belt or a yellow belt The probability that the student is either a green belt or a yellow belt is DO

Algebra

Complex numbersHow many ways are there to select three math help websites from a list that contains twelve different websites There are ways to select the three math help websites X S

Algebra

Complex numbers24 Show how you can determine an equation for the logarithmic function graphed below

Algebra

Complex numbersMr Frank and a few other teachers played in an 18 hole golf tournament The scores are listed below 88 92 58 126 68 74 84 92 104 Find the range and mode O Range 74 and Mode 88 O Range 45 and Mode 98 Range 104 and Mode 92 Range 68 and Mode 92

Algebra

Complex numbersVI Solid or Broken 6 5 4 Yes or No 3 2 6 5 4 3 N W 2 1 1 2 3 4 5 6 y axis 1 2 3 4 5 6 x axis

Algebra

Complex numbersSolve the system of equations by graphing 1 y x 4 3 9 7 A Solve the system of equations using substitution x 2y 6 2x 3y 8 Check anoller203 18ena Jin 8 y x 2 ni sullaupent 2y 3x 2 elve jo Galing berubnd nev 5 S 6 3x y 1 x 2y 5 Check

Algebra

Complex numbersSolve the system of equations by graphing 1 y 3x 4 9 7 1 y x 1 Solve the system of equations using substitution x 2y 6 3x y 1 x 2y 5 2x 3y 8 Check enolisi p3 1Benin 8 y x 2 couleupent be 2y 3x 2 10 010 TYSV Check

Algebra

Complex numbersO about 400 about 500 about 450 For the scatterplot shown below what y value would you expect to be paired with x 9 200 700 6 00 500 400 300 200 100 5 6 7 8 9 10 11 12 13 14 15 16 age

Algebra

Complex numbersThe table represents the function w y which gives the weight of a cow in pounds for y years after it is born a What is the average rate of change of a cow between when it is born and when it is 6 years old b Explain what the average rate of change means in this situation y years old 0 2 4 6 w y weight lbs 60 510 1 000 1 150

Algebra

Complex numbersSolve the System Give answer as x y z 3x 4y 5z 6x 4y 2z 12x 4y 1z 4 No solution Infinite number of solutions

Algebra

Complex numbers1 Evaluate the following integrals 8x 3 a 5 marks 4x2 3x 6 dx b 5 marks e x cos 3xdx c 5 marks sin x cos dx

Algebra

Complex numbersThe two way frequency table contains data about how students access Computer 28 Mobile device 46 Column totals 74 64 O 55 Traditional Online Row totals O 32 33 Splen 62 64 126 What is the joint relative frequency of students who use a mobile device in an online class 90 110 200

Algebra

Complex numbersThe entire graph of the function g is shown in the figure below Write the domain and range of g as intervals or unions of intervals 5 domain range w 0 0 2 5 34 2 2 3 5 2 0 0 0 0 0 0 0 0 8 OUD

Algebra

Complex numbersthe Ex 6 3 You are given the Quadratic Relation in Standard Form You must fin by factoring Exact answer for each x intercept Find the AOS vertex and y intercept as taught Show all your work in a neat and well organized manner Graph a Quadratic Relation by its x intercepts y intercept vertex and AOS Make a sketch It is not necessary to put a scale on each axis You must indicate the co ordinates of each feature as taught Continue your work on next page Not necessary to reflect any point y x 8x 20 Factor fully Find the x intercepts the AOS and the vertex on this side of the sheet 6 marks

Algebra

Complex numbers17 Ms Sanders invested in a stock During the first year the value of the stock tripled The next year the value of the stock decreased by 600 Write an expression that can be used to represent the value of her stock at the end of the second year Be sure to indicate what the variable in your expression represents U Font Family Y AA A FE Y E

Algebra

Complex numbersor each scenario below choose the graph that gives the best representation a Lashonda begins her jogging workout by running faster and faster for about a minute Once she hits a comfortable pace she runs at that pace for several minutes Then she gradually slows down to a stop over the next few minutes Speed 0 Distance from the Nest Time 0 Speed Time 0 Distance from the Nest 0 O y Time Speed Time 0 b A bird of prey leaves the nest to go hunting It flies for several miles away from the nest before stopping to eat After eating it continues flying away from the nest for several more miles looking for more food Distance from the Nest 0 Time y x Time Speed X 0 Distance from the Nest 0 Time y S Time

Algebra

Complex numbersA cookie company uses one cup of sugar for every 25 cookies it makes Let S represent the total number of cups of sugar used and let N represent the number of cookies made Write a equation relating S to N and then graph your equation using the axes below Equation 6 5 w N S 0 0 X 0 0 X 3

Algebra

Complex numbers6 13 d reflection in the line y x Question 25 1 point 4 Listen All asymptotes to the function f x csc z occur when a sinz 0 b cosz 1 Oc cos z 0 i 1

Algebra

Complex numbersIt is an odd function Question 29 1 point Listen Evaluate the following statement as true or false In f x sin z d if d 0 the function f z sin z moves down and if d 0 f x sin z moves up a True b False

Algebra

Complex numbers14 If the base of a triangle is 6a 2 and its height is 13a represent the area of the triangle NOTE A bh

Algebra

Complex numbersQuestion 38 1 point Listen The function f x a sin x contains the point A 1 The function is a f x sin x b f x sin x Oc f x 2 sin x d f x 2 sin x

Algebra

Complex numbersListen One cycle of a sine function begins at x period of the function a Not enough information Ob 2 3 Od 5 d 3 and ends at x What is the

Algebra

Complex numbers40 Listen A ferris wheel at an amusement park completes one revolution every 40 seconds The cars can reach the maximum of 5 metres above the ground and a minimum of 1 metre above the ground The height h in meters above the ground can be modelled using a sinusodial function What is the radius of the ferris wheel a 4 meters Ob 5 meters Oc 2 5 meters d 2 meters

Algebra

Complex numbersAre you ready for more On October 16 1843 while walking across the Broom Bridge in Dublin Ireland Sir William Rowan Hamilton came up with an idea for numbers that would work sort of like complex numbers Instead of just the number i and its opposite i squaring to give 1 he imagined three numbers i j and k each with an opposite that squared to give 1 The way these numbers multiplied with each other was very interesting i times j would give k j times k would give i and k times i would give j But the multiplication he imagined did not have a commutative property When those numbers were multiplied in the opposite order they d give the opposite number So j times i would give k k times j would give i and i times k would give j A quaternion is a number that can be written in the form a bi cj dk where a b c and d are real numbers Let w 2 3i jand z 2i 3k Write each given expression in the form a bi cj dk 1 w z 2 Wz

Algebra

Complex numbersDetermine the function that best represents the following graph 2 30 2 A 1 2 pdf A N 1 2 O a f 2 2 cos z 1 Ob f 2 2 sin z 3 Oc f x 2 cos z 3 3221

Algebra

Complex numbersUse the following information to answer Questions 11 12 The Moondance Riding Academy held its annual horse show for 3 days The total amount collected in entry fees for the 3 days was 1 450 The amount collected in dollars is shown for each of the 3 days in the bar graph below Entry fees collected S 600 500 400 300 200 100 Day 2 11 Approximately what percent of the money collected from entry fees over the 3 days was collected on Day 2 A 29 B 34 C 38 D 66 E 90 Day 1 H 577 J 1 450 K 4 350 Day 3 12 The mean amount collected per day during the 3 day period is what to the nearest dollar F 300 G 483 13 For all n 3n 5 A 6n 15n 10 B 6n 30n 25 C 9n 6n 10 D 9n 15n 25 E 9n 30n 25 1 DO YOUR

Algebra

Complex numbersQuestion 14 1 point 4 Listen The maximum height of water near a tidal power station in New Brunswick is 6 4 metres at 4 30 am and the minimum height is 3 6 m 6 2 hours later Which function can be used to model this relation Oa H t 6 4 cos 2x 4 Ob H t 1 4 cos 2 24 5 Oc H t 12 4 cos 2 4 5 Od H t 1 4 cos 5 5 12

Algebra

Complex numbersListen For the function f x 2 cos 3x 1 the phase shift is Oa units to the right Ob units to the left Oc units to the right d 3 units to the right

Algebra

Complex numbersAs Drake s OVO private jet approaches its horizontal distance from the airport is 22 miles when his altitude is 2 2 miles To the nearest degree what is the 1 1 Sin 0 15 1 angle of depression of Drake s plane Using the diagram 22 write an equation and solve A bike ramp has an elevation of 15 If the height is 22 feet what is the length of the ramp Create a diagram write an equation and solve Round to the nearest foot 19 22 x0 43 S 8 2 3 LEVEL tan 1 tan 0 2 5 202 8 88 9 22

Algebra

Complex numbers5 points Let P denote the vector space of all polynomials in the variable of degree less than or equal to 2 Let C 1 1 x 1 3x x be an ordered basis for P2 a Write 4 x x as a linear combination of elements from the basis C 1 b Let g c denote the coordinate representation of q relative to the basis C Find the coordinate vector representation for 4 x x relative to the basis C Your answer should be a vector of the general form 1 2 3 4 x x c 4 x x 1 x 1 3x x

Algebra

Complex numbersA 253 ft tower is located on the side of a mountain that is inclined 25 to the horizontal A guy wire is to be attached to the top of the tower and anchored at a point 64 ft downhill from the base of the tower Find the shortest length of wire needed NOTE The picture is NOT drawn to scale length of guy wire 25 ft 64 ft 253 ft

Algebra

Complex numbersThe weekly sales of Honolulu Red Oranges is given by q 814 22p Calculate the price elasticity of demand when the price is 32 per orange yes 32 per oranget Interpret your answer The demand is going down by Also calculate the price that gives a maximum weekly revenue Find this maximum revenue per 1 increase in price at that price level

Algebra

Complex numbersMy friend Kathy just bought a home borrow ing 160 000 at a fixed 6 6 interest rate com pounded monthly for 20 years What monthly payment does she make If she decides to sell the house after making exactly 24 monthly pay ments what is the unpaid balance

Algebra

Complex numbersLet sin A sin 2A 3 with A in QIV and find 5 Preview TIP your answer as a number like 5 3 2 2172 Enter

Algebra

Complex numbersLong Term Investments This exercise is based on the following table which lists interest rates on long term investments based on 10 year government bonds in several countries in 2014 Country U S Yield Japan Germany Australia 2 5 0 5 1 0 3 5 Brazil 4 2 If the Interest on a long term U S Investment is compounded continuously how long will it take the value of an investment to double Give the answer correct to two decimal places yr

Algebra

Complex numbersSimplify each expression and eliminate any negative exponent s a x y 1 b a b 3 4 a4 3 c 3 3y 3