# Which value of r represents data with a strong negative linear correlation between two variables? 1) -1.07 2) -0.89 3) -0.14 4) 0.92

26,129 questions, page 54
1. ## Math

identify the center and radius of the circle with the equation (x+5)^2+(y-2)^2=9 A. this equation represents a circle with center (5,-2) and a radius of 3 units B. This equation represents a circle with center (-5,2) and a radius of 3 units C. this

asked by Kathryn on May 21, 2014
2. ## physics

how much output I can get if a coil having 100000 turns moves pass a strong 3000 gauss neodymium magnet only once a time?

asked by vikram on September 4, 2016
3. ## physics

How strong an electric field is needed to accelerate electrons in a TV tube from rest to one-tenth the speed of light in a distance of 4.9 cm ?

asked by Debra on June 15, 2011
4. ## English

is this a strong thesis statement? A safe and effective method, vaccines protect children and those around them from harmful diseases and illnesses.

asked by Sara123 on February 9, 2019
5. ## chemistry

What is the difference between the two strong acids, nitric and hydrochloric acid, when they behave as the oxidised forms in a reduction half-equation?

asked by alex on May 6, 2013
6. ## Chemistry

Which one of the following salts is obtained by the reation of a weak acid with a strong base. MgCl2 NH4F LiClO4 NaCl K2SO3

asked by LT on April 14, 2008
7. ## chem

Calculate the hydrogen ion concentration of a 3.55×10-4 M solution of the strong base KOH. Round your answer to 3 significant digits.

asked by kathy on April 17, 2010
8. ## Chemistry

Which of the following systems could act as a buffer? A. HCl/Cl- B. NaOH/OH- C. HSO4-/SO4-2 D. H3O+/OH- E. All of the above my guess is C because A and B are too strong, but I am unsure of D. Can someone explain how to think through this?

asked by Trixie on March 14, 2010
9. ## chemistry

What is the pOH of a 0.032 M Ca(OH)2 (strong base) solution? i solved it by doing 14=-log (0.064) 14-1.19= 12.81 but the right answer is 1.19, why? i thought the OH in the problem meant i had to use 14?

asked by jessie on December 11, 2010
10. ## English

I'm writing an easy about my hero. I need s strong into sentence with a a action work. So carving have "Taylor swift has impacted my life..''

asked by EnglishLove on March 9, 2011
11. ## Chemistry

The following soluble salts are strong electrolytes. For each, write a balanced equation for their dissociation in water. NaBr BaBr2 Li3PO4

asked by Katie on August 2, 2016
12. ## computer science

in mobile phone network how many times as strong would a signal be expected to be at 200 m from a base station, compare with at 600 m? is it 81 or 9 or 3 or 0.3 or 0.1 or 0.01

asked by Jo on April 6, 2011
13. ## Math

What is the sum of all the integers between - (negative) square root of 9 and square root of 15 (Not negative 9s square root)

asked by Emma on October 14, 2015
14. ## Chemistry 12

9. According to Arrhenius, which of the following groups contain: i)only acids ii)only bases a. NaOH, H2CO3, KCl b. MgCl2, H2SO4, HCl c. HNO3, HCl, H3PO4 d. Mg(OH)2, AgBr, HF e. KOH, NH4OH, Ba(OH)2 10. Enough water is added to 100 g of sodium hydroxide in

asked by Kavitha on May 22, 2011
15. ## Chemistry

I have no idea where to even start with this problem on my pre-lab! For part of the experiment, you will need to prepare 100 mL of 0.025 M CH3CO2H, starting from commercial "glacial" acetic acid, which has a concentration of 17.4 M. This is best done by

asked by Jen on October 10, 2011
16. ## com sci

A rational number is the form of a/b, where a and b are integers with b != 0. Develop and test a class for processing rational numbers. The class should have a numerator data member and a denominator data member. It should read an display all rational

asked by Dan on November 12, 2012
17. ## pre-calc

area of a rectangular region: a farmer wishes to create two rectangular regions bordering a river, by three fences perpendicular to the river and one connecting them. suppose that x represents the length of each of the three parallel pieces of fencing. she

asked by steph on November 10, 2011
18. ## Physics

A conical pendulum is formed by attaching a ball of mass m to a string of length L, then allowing the ball to move in a horizontal circle of radius r. 1. Find an expression for the tension T in the string. (Express your answer in terms of the variables L,

asked by Anonymous on October 10, 2012
19. ## Science

I need to observe and identify variables and I'm in 6th grade!!! Help, this work is killing me....It's scenario 1-4 and I have Mr Jones plz help plz

asked by Destiny on August 31, 2012
20. ## math

Addition and subtraction are examples of what are best called ____ a. variables b. terms c. equations d. operations I believe the answer is is B terms

asked by Jackie on October 7, 2008
21. ## Algebra 2

simplify each expression. rationalize all denominators. assume that all variables are positive (1-sqrt(3x))/(sqrt(6x)) Please show work!!!!

asked by maria on February 9, 2015
22. ## physics

discuss the relationship of the following variables with the centripetal force: a.)radius of revolution b.)mass of the object c.)speed of revolution.

asked by zianna on September 18, 2012
23. ## inverse functions

1-3cos=sin squared You need to define the variables, such as x, y etc. If you are trying to solve 1 - 3 cos x = sin^2 x for whatever x is, then you are not talking about an inverse function.

asked by fiza on February 26, 2007
24. ## Science

For my science (biology) coursework i am doing an experiment involving photosynthesis- the cabomba experiment. I need to know 1- the variables that are controlled and why 2- what equipment is used and why PLEASE HELP... THANK YOU

asked by Hifza on November 29, 2014
25. ## math

simplify these expressions as fractions: (26/27) + (35/4) (26/27) x (35/4) (3x/2y^2) x (2yx/x^2) and what are the restrictions of x, y? (3x^y/zw) + (tx^2y^3w^4/z) and what are the restrictions for he variables x, y, z, t, w to make the expression well

asked by kelly on January 28, 2009
26. ## Math

Simplify. All variables represent nonzero real numbers. The power of a power rule -5y4(y5)2 15y7(y2)3

asked by Anonymous on April 12, 2010
27. ## Algebra

Express in mathematical form using two variables(x,y) the sum of the numerator and the denominator of a fraction is greater by 1 than thrice the numerator

asked by XYZ on February 5, 2016
28. ## financial statistics

Can you construct a pair of random variables such that Var(X)=Var(Y)=1 and Cov(X,Y)=2?

asked by clarkson on September 21, 2011
29. ## CHEMISTRY

LABLE THE VARIABLES IN THE EQUATION BELOW WITH THE CORRECT UNITS RATE=k(a)(b) UNITS M-2S-1, M, M.S-1, M-1S-1, S-1, M.S WHAT IS K WHAT IS A WHAT IS B

asked by LENNON on September 8, 2014
30. ## math (calculus)

when figuring intergrals, how do you apply change of variables? IT depends on what you mean by "figuring".

asked by arshdeep on November 27, 2006
31. ## Algebra

|3a 2z 5m| |2k 5 6| I am trying this one but am totally lost. You gave the answer to one earlier. If I am in need of the value of the variables z Is this answer z=2

asked by mike on December 17, 2009

I need someone to explain how to solve equations with two variables and tell me what the formula or equation is? Please help and explain. Thank you!

asked by saranghae12 on March 1, 2012

Use implicit diff. to find dy/dx of each of the following. In the following x,y and (a) are all variables. Show step by step please! Thank you! 1) y^2 = x^2+a^2 2) y^2+ay = x^2+ax+a^2

asked by Josh on March 16, 2014
34. ## Calculus

So I have a function of two variables f(x,y)=y^x. where is this function continuous? I'm thinking that the only restriction that applies is y>0

asked by Sammie on September 26, 2009
35. ## probability

find an example for random variables X,X',Y,Y' with the following characteristics: a)X and X' have the same distribution b)X+Y and X'+Y' have the same distribution c)Y and Y' do not have the same ditribution

asked by sanaz on January 10, 2013
36. ## Rate Constants

I'm really stuck with this one. Here's the rate law and the data that is needed. I appreciate any help Rate= k[I2]X{[H+]Y[CH3COCH3]Z Trial Volume of 0.0010 M I2 Volume of 0.050 M HCl Volume of 1.0 M acetone Volume of water Temperature (degrees C) Reaction

asked by Amy on February 12, 2013
37. ## Angular acceleration

A flywheel of 480 mm diameter is accelerated with an angular velocity of 0.4 rad/s^-2 from rest by an electric motor until it is rotating at 400 revs/minute. Calculate: a) the time of acceleration b) the linear speed of the rim of the flywheel My answer

asked by Jim (BIGEYE) on January 21, 2007
38. ## microsoft excell 2007

when working with predefined formulas in excel,what category contains the boolean functions? (a)math and trig (b)recently used (c)logical (d)auto sum my answer is c debbie needs to print her table.which of the following is not an excel print program?

asked by susue on April 11, 2012
39. ## Biology

You are testing the injection of a new chemical on mice to see if it can shrink tumors. To properly administer the chemical, it must be dissolved in water with ascorbic acid (vitamin C) and injected into the middle of a tumor. As a positive control, you

asked by Jenny on August 19, 2014
40. ## science( chem)

Calculate the molar solubility of Mg(OH)2 in water I know Mg(OH)2=> Mg2+ + 2OH- 2H2O=> H3O+ + OH- Ksp= [Mg2+][OH]2 Kw= [H30+][OH-] Mass balance [Mg2+]=2[OH] So.. [OH-]=2[Mg2+]+ [H3O+] Charge balance is where I get kind of confused I know that the positive

asked by christina on July 20, 2007
41. ## math

Fair Race Portfolio Template: Functions Instructions: Follow the instructions provided in the lesson. Use this template to record your work and answers. Please submit this template to the dropbox along with any other evidence you would like to provide for

asked by help on February 17, 2017
42. ## Algebra 1A

I need some help with collecting data to graph how fast others can say the tongue twister (The sunshade sheltered Sarah from the sunshine). I need help with making a table of the data. I am uncetain if each person is to say the tongue twister once and I

asked by Brionne on January 12, 2008
43. ## maths

a car depreciates at rate of 10%per year. the car cost £20000 new. (a) explain why the car wont be worth £16000 after 2 years (b) show that the car will be worth £16200 after 2 years and find the value of the car after 3 years (c) describe the type of

asked by maryam on February 8, 2016
44. ## math

Scenario: Regression equations are created by modeling data, such as the following: Sales = (Cost Per Item × Number of Items) – Constant Charges In this equation, constant charges may be rent, salaries, or other fixed costs. This includes anything that

asked by sharon on May 5, 2011
45. ## MATH,statistics

At a recent scotch-tasting party, 20 faculty members and their (opposite sex) spouses were guzzling it back pretty well. One person quite correctly noticed that the women seemed to be drinking more than the men. If the mean number of drinks had by the men

asked by Tanya on November 2, 2012
46. ## Communications 220

Create a thesis for your research paper. How do you plan on supporting your thesis with compelling arguments and coutner arguments? This is what I have so far. Please let me know if I need to further explain how I will support the arguments and if the

asked by Amanda on May 24, 2010
47. ## physics

What can we conclude from the attractive nature of the force between a positively charged rod and an object? 1. The object has no net charge. 2. Cannot be determined. 3. The object does not have an appreciable negative charge. 4. The object does not have

asked by Anonymous on February 20, 2010
48. ## algebra 1

A research scientist measures the outside temperature, in degrees Fahrenheit, at various times throughout a 24-hour period and records her findings in the graph below. In this real-world function, the hours represent the input values, and the temperature

asked by Crissy on November 17, 2015
49. ## Physics

an automobile tire has a radius of 0.350M, and its center forward with a liner speed of v=13.0m/s. (a) Determine the angular speed of the wheel. (Assume that there is no slipping of the surfaces in contact during the rolling motion.) (b) Relative to the

asked by CJ on March 14, 2007
50. ## Math

You want to determine the average number of songs people keep on their MP3 players. You want to collect data from a random sample of at least 300. Which of these would be the most valid method of collecting data? a. Survey students coming in and out of

asked by Anonymous on May 20, 2014
51. ## Science

Uranium-238 is less stable than oxygen-16. What accounts for this difference? (A) Uranium is a solid, while oxygen is a gas. (B) Unlike oxygen-16, uranium-238 has a nucleus in which repulsive electric forces surpass the strong nuclear forces. (C) Oxygen-16

asked by AJ on November 20, 2013
52. ## LA....help!!!????

Someone from connections academy 7th grade gifted and talented LA??!!! help! check answers, dunno whether to send in or not!! 1. Which of the following statements about "3BCB: Three" by Clay Bennett is NOT true? (1 point) the cartoonist is concerned about

asked by TTR+S<3 on January 7, 2014
53. ## French-Mme SraJMcGin

Bonjour, I just want to make absolutely sure that I now properly understand this: I know how to use negation in a simple sentence. No problem. I still am a bit shaky on sentences with two verbs; if I understood you correctly, then when a negative sentence

asked by Anonymous on April 25, 2008
54. ## maths

A truck rolls down a hill subject to acceleration due to gravity and resistance (including air resistance, rolling friction, etc) and the distance si (metres) travelled after ti seconds is observed. Classical mechanics predicts that the distance travelled

55. ## ap biology

Molecules that result from this bond do not dissociate in water because its atoms are not charged and, therefore, not attracted to the negative or positive ends of the water molecule. H-bond ionic bond nonpolar covalent bond polar covalent bond I am

asked by HEY on August 17, 2007
56. ## science(HELP)

WHAT IS THE INDEPENDENT AND DEPENDENT VARIABLES BASED ON THIS QUESTION: DOES HUMIDITY AFFECT HAIR IN THE SAME WAY WHETER IT IS LONG, SHORT,STRAIGHT, CURLY, COLORED, OF PERMED? I REALLY NEED SOME HELP I'M SO CONFUSED AND FRUSTRATED!!!!!!!!!!!!!!

asked by SIMP( secret important person) on October 4, 2009
57. ## physics

Using conservation of energy, find the speed v_b of the block at the bottom of the ramp. Express your answer in terms of some or all the variables m, v, and h and any appropriate constants. I would think it would be square root of v^2+2gh but its telling

asked by Mrs G on March 3, 2012
58. ## Math

If a substance has a half life of 600 seconds. If a scientist begins with an initial amount of 1kg complete the following problems: create an exponential equation using proper variables?

asked by Cali on May 11, 2016
59. ## Economics

Its difficult to meet the requirements of ceteris paribus when studying a relationship between unemployment and inflation. Is this true or false??? True; When studying the relationship between unemployment and inflation, one must look at empirical,

asked by Dave on June 4, 2007
60. ## statistic

This data shows the final exam scores of 10 randomly selected students and the number of hours they studied for an exam. (hours, scores) (3, 65), (5, 80), (2, 60), (8, 88), (2, 66), (4, 78), (4, 85), (5, 90), (6, 80), (3, 71) Find the equation of the

asked by maria on September 17, 2011
61. ## MATH HELP

I posted this yesterday and no one bothered to check it, therefore Im posting it again, please check it this time. The south edmonton pet shop has several parrots and dogs for sale. There are a total of 24 heads and 82 legs in the display cages. A) Write a

asked by Anonymous on January 11, 2011
62. ## Science

1.How is science & society related? i have no idea what the answer to this question is 2. What is a scientist's usual next step if data supports a hypothesis? can you tell me if i'm right?... i think that they either published or the experiment is

asked by Leslie on August 21, 2006
63. ## Finance

Using Monte Carlo simulation, calculate the price of a 1-year European option to give up 100 ounces of silver in exchange for 1 ounce of gold. The current prices of gold and silver are \$380 and \$4, respectively; the risk-free interest rate is 10% per

asked by Justin on April 25, 2011
64. ## Algebra

For parts (a)–(c) use the following equation: y = 2/(x + 6). (a) Find the ordered pair that represents a solution to the equation when the value of x is 0. 0 , (b) Find the ordered pair that represents a solution to the equation when the value of y is 4.

asked by Autumn on September 7, 2008
65. ## English

17. For most academic writing, the types of evidence preferred include A. a combination of assertions and first-hand experiences. B. personal observations and opinions. C. facts, statistics, and expert testimony. D. general statements and quotations by

asked by Ariel on February 6, 2018
66. ## Biology - Evolution

In one sentence each, describe a) one positive effect of direct artificial selection b) one negative effect of direct artificial selection c) one negative effect of indirect artificial selection

asked by Sara on December 28, 2011
67. ## motion analysis

5. (a) Using the information below estimate the time required to analyse the data collected using the two motion analysis systems when there are 10 markers on the subject and the data is collected for 100 frames. Cinematography system 2 seconds per marker

asked by arzam on December 30, 2013
68. ## motion analysis

5. (a) Using the information below estimate the time required to analyse the data collected using the two motion analysis systems when there are 10 markers on the subject and the data is collected for 100 frames. Cinematography system 2 seconds per marker

asked by arzam on December 29, 2013
69. ## math

An airline’s weekly flight data showed a 98% probability of being on time. If this airline has 15,000 flights in a year, how many flights would you predict to arrive on time? Explain whether you can use the data to predict whether a specific flight with

asked by Sid on March 8, 2016
70. ## algebra

y=3(x+5)(x-2) I'm suppose to simplify right? There is no way to solve for the variables. y=3(x+5)(x-2) use the distributive property y=3x+15(x-2) y=3x+15x-30 y=18x-30 thanks for your help but the book says the answer is y =3xsquared + 9x-30 how did they

asked by lajeana golden on June 6, 2007
71. ## physics

If the zero level is a distance 2h/3 above the floor, what is the potential energy U of the block on the floor? Express your answer in terms of some or all the variables m, v, and h and any appropriate constants.

asked by Mrs G on March 3, 2012
72. ## Algebra/math

simplify the expression. Assume that all variables represent positive numbers. (36^-2y^4)-1/2(xy^1/2) I can't get the answer to this I just don't know how to answer this problem. Can anyone help? Thank You! Ashley

asked by Ashley on September 26, 2008
73. ## Statistics

A test for independence is applied to a contingency table with 3 rows and 5 columns for two nominal variables. The degrees of freedom for this test will be: A) 20 B) 12 C) 8 D) 15

asked by Stuart on March 15, 2009
74. ## MARKETING

am not sure how to answer this question that's y am posting this question here. what variables would you used for identiify ing market segment?? is it about behavioural, demographic, geographic!!??

75. ## Algebra

Need help trying to solve this question. Using the variables x and y determine the two equations you would need to solve for the maximum area to enclose a patio given 28 feet of fencing.

asked by Ebony on February 17, 2017
76. ## Algebra

Solve the formula for the given variable. Assume all variables represent nonnegative numbers. A=6s^2, for s A. A/6 B. SQRT A/6 C. -SQRT A/6 D. Not given I believe the anser is B, but not 100% sure

asked by Jen on November 22, 2009
77. ## Physics

Why is it desirable to use monochromatic light when studying polarization by reflection? It is desirable to reduce the number of variables in the experiment. It is not absolutely necessary.

asked by Caleb on April 18, 2007
78. ## algebra

I must solve the equation using elimination. I have have only 1 Variable on the left side of the equal sign. ( Elimination is most convenient when the variables are lined up ) 2x-4y=14 4y-x=-3

asked by K A Y S H A on December 9, 2014
79. ## Statistics

A test for independence is applied to a contingency table with 3 rows and 5 columns for two nominal variables. The degrees of freedom for this test will be

asked by Joe on May 12, 2009
80. ## Chem help asap

A 890 mL NaCl solution is diluted to a volume of 1.15 and a concentration of 8.00 . What was the initial concentration? How do I go about this? M1V1=M2V2? and if it is how do I replace the variables?

asked by Whitney on November 14, 2012
81. ## math

A function is given by, f(x,y) = x^4 - y^2 - 2x^2 + 2y - 7 Using the second derivative test for functions of two variables, classify the points (0,1) and (-1,1) as local maximum, local minimum or inconclusive.

asked by enigma on September 26, 2012
82. ## algebra

Sorry i hit submit to quick. my question is that i have to determine the relationship of these and express them using variables input output 12 16 16 19 20 22 24 25 26 26.5 I relize that the last one is .5 more then 1,2,3 and 4 not sure how to express

asked by cole on August 28, 2007
83. ## College Stats

Suppose that two random variables X1 and X2 have a bivariate normal distribution, and Var(X1) = Var(X2). Show that the sum X1+X2 and the difference X1− X2 are independent.

asked by Sophia on January 24, 2017
84. ## Economics

If the market price falls below \$4.50, the firm will earn A. positive economic profits in the short run. B. negative economic profits in the short run but remain in business. C. negative economic profits in the short run and shut down. D. zero economic

asked by Bob on November 29, 2011
85. ## statistics

In the old days, we could buy 8 inch floppies for our computers on which to store our favorite programs and data. But, the manufacturing ability was not that good back then and 1% of these 8 inch floppies sold had a bad sector or two on them which made

asked by chandler on July 10, 2014
86. ## Chemistry

Ammonium nitrate, NH4NO3, is used in “cold packs”. Which statement best describes why the products are favored, when the solid is mixed with water? NH4NO3(s) → NH4+ (aq) + NO3- (aq) A) Heat is transferred to the surroundings to lower the temperature

asked by Bear on October 6, 2016
87. ## English

Can you check if my explanation is weak, moderate or strong? Tell me why is it weak, moderate or strong. If it's weak, what can I do to improve my explanation? -- Point 2: In addition, the Nurse intimidates the patients to show how powerful she is and that

asked by Anonymous on December 2, 2007
88. ## Algebra

One month, a music site observed that 60% of the people who downloaded songs from its site downloaded Q Sam's latest single. The equation below represents this information, where x represents the total number of people who downloaded songs from the site

asked by Aelia Trainer on September 7, 2017
89. ## Biology

Read Scientific Inquiry, Controlled Experiments Then and Now, pages 6-7 of your textbook. Start by observing the living species around you. Ever wonder why a pollinator is attracted to a particular flower, or what would happen to predator species if a

asked by Tammy on June 12, 2009
90. ## Biology

Read Scientific Inquiry, Controlled Experiments Then and Now, pages 6-7 of your textbook. Start by observing the living species around you. Ever wonder why a pollinator is attracted to a particular flower, or what would happen to predator species if a

asked by Samantha on August 30, 2009
91. ## Calculus

Determine whether the integral is divergent or convergent. If it is convergent, evaluate it and enter that value as your answer. If it diverges to infinity, state your answer as "INF" (without the quotation marks). If it diverges to negative infinity,

asked by Hannah on October 22, 2010
92. ## Biology

Okay so if i have two enzyme catalyzed reactions: 1) delta g of the ES = -22kJ/mol 2) delta g od the ES = 42 kJ/mol Is this first reaction going to have a higher reaction rate because the of the negative delta g, because doesnt a negative delta g give you

asked by Cindy on January 26, 2013
93. ## math

which of the following correlation demonstrate a casual relationship? 1 the distance student live from school and the time it takes each to walk there. 2 the amount of money received for allowance and the number of DVD's purchased. 3 the number of hours

asked by Anonymous on May 9, 2009
94. ## Physics

I know this is long but can someone just explain it to me? Please? Don't have to give the answer, I'm just confused :( 1. An experiment was devised to investigate the effects on the temperature of a cup of hot tea when lemon juice is added at different

asked by Martha on June 3, 2014
95. ## economics

You are planning to estimate a short-run production function for your firm, and you have collected the following data on labor usage and output: Labor usage Output 3 1 7 2 9 3 11 5 17 8 17 10 20 15 24 18 26 22 28 21 30 23 Does a cubic equation appear to be

asked by natalie on August 18, 2008
96. ## economics

You are planning to estimate a short-run production function for your firm, and you have collected the following data on labor usage and output: Labor usage Output 3 1 7 2 9 3 11 5 17 8 17 10 20 15 24 18 26 22 28 21 30 23 Does a cubic equation appear to be

asked by natalie on August 18, 2008
97. ## Managerial ECON

You are planning to estimate a short- run production function for your firm, and you have collected the following data on labor usage (L) and output (Q): Labor usage Output 3 1 7 2 9 3 11 5 17 8 17 10 20 15 24 18 26 22 28 21 30 23 a. Does a cubic equation

asked by lost on November 6, 2011
98. ## Statistics

A study on the amount of dye needed to get the best color for a certain type of fabric was conducted. The following data give the photometer readings for the color density of the fabric when the amount of dye used was 1% of the weight of the fabric. 13.2

asked by Lance on April 30, 2012
99. ## physics

a steel rod when measured with a zinc scale both being at 25 degree Celsius appear to be one meter long.if the zinc scale is correct at 0 degree Celsius, what is the actual length of the rod at 0 degree Celsius? [linear expansivity of steel=12*10^-6

asked by sanjeet on November 21, 2010
100. ## math

Suppose that a market research company finds that at a price of p = \$30, they would sell x = 36 tiles each month. If they lower the price to p = \$15, then more people would purchase the tile, and they can expect to sell x = 41 tiles in a month’s time.

asked by jean on July 31, 2011