# Show that the equation 3x^2 - x^3 + 3 = 0 can be rearranged to give: x = 3 + 3 ---- x^2 x^3 = Divide by ? = x = 3 + 3 ---- x^2 Using Xn+1 = 3

62,835 questions, page 522
1. ## statistics

MBA604 Statistics Assignment 1 Part 1 1) (5 pts) An electronics company is about to launch a new product. If the serial number for each piece produced has the following format: LLNNN where L stands for any letter in the English alphabet and N is a number

asked by austin on July 12, 2013
2. ## Orientalism

List two to three characteristics of Orientalism We've had many questions about Orientalism in the last year, but many of us don't really know what it means. Please post a definition of Orientalism, and we'll try to help you find its characteristics. These

asked by Anonymous on May 16, 2007
3. ## Physics

Light is incident on a glass-air interface from the glass side (n=1.5), and researchers want to use the evanescent field on the air side (n=1.0) to excite the molecules adhered to the surface. It is desired that the evanescent field extend a distance δ =

asked by Vanda on October 9, 2011
4. ## Physics

A certain lightbulb has a tungsten filament with a resistance of 28 Ω when cold and 144 Ω when hot. If the equation R = R0 [1 + α ∆T ] can be used over the large temperature range involved here, find the temperature of the fila- ment when it is hot.

asked by Aj on October 31, 2012
5. ## Chemistry --really need help!

I am really struggling with these problems!! A reaction mixture that consisted of 0.20 mol N2 and 0.20 mol H2 was introduced into a 25.0 L reactor and heated. At equilibrium, 5.0% of the nitrogen gas has reacted. What is the value of the equilibrium

asked by Angelica on February 19, 2010
6. ## Physics

Two baseballs, each with a mass of 0.157 kg, are separated by a distance of 379 m in outer space, far from any other objects. If the balls are released from rest, what speed do they have when their separation has decreased to 173 m? Ignore the

asked by Stella on April 28, 2012
7. ## Chemistry

If the initial concentration of NH3(g) is 4.643 mol/L, calculate the % of NH3(g) left over after the reaction reaches equilibrium according to the balanced equation. The value of Kc at 773.0 K is 16.70. The initial concentration of the reaction products is

asked by j on December 3, 2011
8. ## Algebra

A type of plant is introduced into an ecosystem and quickly begins to take over. A scientist counts the number of plants after m months and develops the equation p(m)=19.3(1.089) raised to m, to model the situation. Most recently, the scientist counted 138

asked by Lina on September 23, 2015
9. ## Chemistry

Ammonia is produced when Nitrogen gas reacts with Hydrogen gas, as shown by the equation below: N2 + 3H2 --> 2NH3 If the percentage yield is 90%, what would be your experimental yield of NH3 if 145.8g of N2 react? 2) 2Mg + O2 --> 2MgO A) If 50g of Mg

asked by Mark on May 21, 2014
10. ## chem sorry the last one did not have the question

A sample of PCl5 weighing 2.69 grams is placed in a 1.000 liter flask and vaporized completely at 250 o C. The final pressure observed at this temperature is 1.000 atmospheres. Note that some, but not all of the PCl5 decomposes according to the equation:

asked by laura on December 6, 2011
11. ## chem

A sample of PCl5 weighing 2.69 grams is placed in a 1.000 liter flask and vaporized completely at 250 o C. The final pressure observed at this temperature is 1.000 atmospheres. Note that some, but not all of the PCl5 decomposes according to the equation:

asked by laura on December 5, 2011
12. ## Algebra

How do you find the function to a problem quickly? For example: A tennis club holds a doubles tournament every spring. This year the club has 40 teams involved. At the end of each round half of the teams are eliminated. How many rounds must be played to

asked by Renee on March 10, 2010
13. ## Chem

using the properties of sodium cyanide , deduce the type of bonding that holds this compound together, explaining how you arrived at your conclusions. write a balances equation for the reaction that occurs when sodium cyanide dissolves in water. Any help

asked by Kirsty on March 6, 2007
14. ## pre-calculus

I have absolutely no idea even where to start. Please help! The carnival has come to town with a ferris wheel that has a radius of 30 feet. People get on when passenger compartments are at the lowest, 2 feet off the ground. The wheel makes a full

asked by dave on July 1, 2017
15. ## Math

Find the volume of the solid generated by revolving the region bounded by y=x+(x/4), the x-axis, and the lines x=1 and x=3 about the y-axis. I've drawn the graph and I understand which part is being rotated, but I'm having trouble setting up the equation.

asked by Eliana on April 30, 2015
16. ## Math

This is also another problem that I'm having trouble on. A motorboat can maintain a constant speed of 16 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 20 minutes; the return trip takes 15 minutes. What is the

asked by amy on September 16, 2010

A type of plant is introduced into an ecosystem and quickly begins to take over. A scientist counts the number of plants after m months and develops the equation mc010-1.jpg to model the situation. Most recently, the scientist counted 138 plants. Assuming

asked by Anonymous on June 24, 2015
18. ## Chemistry

Ammonia is produced when Nitrogen gas reacts with Hydrogen gas, as shown by the equation below: N2 + 3H2 --> 2NH3 If the percentage yield is 90%, what would be your experimental yield of NH3 if 145.8g of N2 react? 2) 2Mg + O2 --> 2MgO A) If 50g of Mg

asked by Mark on May 21, 2014
19. ## Chemistry

I have this problem: How much heat energy is required to raise the temperature of 0.365kg of copper from 23.0 ∘C to 60.0 ∘C? The specific heat of copper is 0.0920 cal/(g⋅∘C). I did the equation using formula Heat= mass x change in temperature x

asked by mysterychicken on January 29, 2014
20. ## exponential and logarithmic graphs question

hi, i desperately need help solving this question: Find the values of A and k if the general equation of the graph shown is y=Ae^kx where the graph goes through the points (-1,-4) and (-2,-10) do i solve it using simultaneous equations? because i have

asked by elle on March 21, 2007
21. ## Biochemistry

1. MES (2-(N-Morpholino)ethanesulfonic acid) is a common buffer used in biochemistry labs to stabilize proteins. The pKa for MES is 6.09. a. What is the pH of 1 liter of a 200 mM MES aqueous solution? Clue: you will need to solve a quadratic equation. (2.5

asked by Peter on January 29, 2012
22. ## Chemistry- test for presence of sulphate

I have a solution of Fe2(SO4)3, i.e. iron(III) sulphate solution. To test for the presence of the sulphate anion, nitric acid & barium nitrate were added. A white precipitate was obtained. Please help to check if the following equation is correct for the

asked by june on January 18, 2009
23. ## Discipline and Guidance

Two children are fightining over the blue marker. According to constructivist discipline, what is the best approach for the caregiver in this situation? A. Take the blue marker from both children and tell them to clean up their work,since they cannot get

asked by Melody on January 11, 2007
24. ## language help !

DAD: Where’s the water now? MOM: As high as the car’s wheels. DAD: We’d better go. MOM: We can’t. The car’s dead. DAD: What? MOM: The water is up to the engine; it won’t start. TINA: Oh, no! MARK: What can we do? DAD: I don’t know. (He looks

asked by kelsey on May 20, 2014
25. ## Muslim and Arab Americans

that is 4 questions that I have here is 1. Ho are your table answers similar? How are they different? Do either tables list descriptors in the Both Groups category? Describe. From either or both tables, name one or two descriptor(s) that you think

asked by Letitia on January 14, 2007
26. ## Math

23. Lois built a rectangular flower bed. She used four boards for the border of the flower bed. Two of the boards were 4 feet long. The other boards were 8 feet long. a. What was the area of the flower bed using these boards? b. She decided to cut each

asked by maryanne on November 6, 2016
27. ## Education

Hello, I have to make a flyer for my early childhood education program, to promote healthy pregnancies. Does anyone know how to go about making a flyer? I need a catchy title. I know what to put in the flyer just need a good title and how to make the

asked by clark on September 2, 2006
28. ## can somebody help me with this

College enrollments in the United States are projected to increase from 1995 to 2005 for public and private schools. The models below give the total projected college enrollments in thousands, where x=0 represents the first year 1995. Public College: f(x)

asked by johnathan on August 28, 2005
29. ## Math Quadratic Equations . URGENT!!!!

A toy rocket is launched form a 3m platform, at 8.2m/s. The height of the rocket is modelled by the equation h=-4.9t^2+8.1t+3 where h is the height, in metres, above the ground and t is the time, in seconds. After how many seconds will the rocket rise to a

asked by Rose on November 20, 2016
30. ## Algebra 1

The population of a city increases by 4,000 people each year. In 2025 the population is projected to be 450,000 people,. What is the equation that gives the city's population p ( in thousands of people) x years after 2010?

asked by Steve on December 4, 2014
31. ## Math

Alex's distance form home is represented by the equation D= -0.5t +300 D represents his distance from home and t represents time in minutes How long will it take Alex to reach a distance of 182 km from home

asked by Sally on June 9, 2014
32. ## Calculus

Find the specific solution of the differential equation dy/dx = 4y/x^2 with condition y(−4) = e. y equals negative 1 minus 4 divided by x y equals negative 1 times e raised to the 1 over x power y equals e raised to the negative 4 over x power None of

asked by nan on March 10, 2016
33. ## Intergated chemistry/physics

The Lamborghini Diablo sports car can accelerate from 0 kilometers/hour to 99.2 kilometers/hour in 4.0 seconds. What is the acceleration of this car in kilometers/hour^2. (hint: you must convert 4.0 seconds before putting it into the equation.)

asked by Laura on October 3, 2012
34. ## calculus

A cylindrical drum with an open top is to be constructed using 1 m^2 of aluminum a)write and equation for the volume of the drum in terms of radius b)what radius gives the direct maximum value? c)What is the maximum volume if the radius can be a maximum of

asked by lotus on April 11, 2015
35. ## Math

Rae runds a mile 20 times. Her average time is 5.2 mins. She wants to drop her slowest time 5.8 mins and find the ew average. Write and equation to find are her new average running time

asked by Abby on November 15, 2010

A toy rocket is launched form a 3m platform, at 8.2m/s. The height of the rocket is modelled by the equation h=-4.0t^2+8.1t+3 where h is the height, in metres, above the ground and t is the time, in seconds. After how many seconds will the rocket rise to a

asked by Rose on November 20, 2016
37. ## Chemistry

Please tell me which Gas Law equation to use to figure out this problem... A helium balloon at 25°C, 1 atm, has a volume of 2.88 L. Additional helium is pumped into the balloon. It now contains 1.20 g of He and its new volume is 7.20 L. How many moles of

asked by Pam on March 23, 2013

A toy rocket is launched form a 3m platform, at 8.2m/s. The height of the rocket is modelled by the equation h=-4.0t^2+8.1t+3 where h is the height, in metres, above the ground and t is the time, in seconds. After how many seconds will the rocket rise to a

asked by Rachel on November 20, 2016
39. ## trig

A population of wolves in a country is represented by the equation p(t)=80(0.98)^t, where t is the number of years since 1998. Predict the number of wolves in the population in the year 2008. how many years will it take for the population of wolves to

asked by Anonymous on February 26, 2013
40. ## algebra 1

A chemist has one solution containing 30% insecticide and another solution containing 50% insecticide. How much of each solution should the chemist mix to get 200 L of a 42% insecticide? My teacher explained how to set up the problem: 3x+5y=84 x+y=200 what

asked by ben on December 4, 2014
41. ## Math

Mrs. Jones and Mr. Graham had the same amount of money at first. After Mrs. Jones bought a computer that cost \$2,055, she had 1/4 as much money as Mr. Graham. How much money did Mr. Graham have? I know that x = y in equation 1. I know that x-2055 = .25G

asked by Suh on November 16, 2016
42. ## English

Thank you for your help however I think you misunderstood me. In the sentence “Pediatric Residency Program” continued that the health insurance covers the pediatrician and his family. The part in quotations is the title of the source and I left it in

asked by Idk on March 2, 2018

I have presentation on Purchasing candels and i want to make sure what am presenting is right. Please tell me what i have is right or wrong. Thanks! 1) Identify 3 main tasks/responsibilities of purchasing: Personnel and comparing assistance nedded. 1) Get

asked by Dancer on October 30, 2011
44. ## CALCULUS

9. Suppose an experimental population of amoeba increases according to the law of exponential growth. There were 100 amoeba after the second day of the experiment and 300 amoeba after the fourth day. Approximately how many amoeba were in the original

asked by Anonymous on May 29, 2012
45. ## physics

White light strikes a grating with 1300 lines/cm at normal incidence. How many complete visible spectra will be formed on either side of the central maximum? (Take the range of visible wavelengths to be 400 - 700 nm.) I used the equation d sintheta = m

asked by jay on August 20, 2007
46. ## Axia Math 117

I am of need of HELP. I am working on the word problems for AXIA math 117 and I do not understand the first problem. I have listed the information below. I have tried many times and I have not figured this out. My assignment is due tomorrow and I am

asked by Ann on August 6, 2010
47. ## Physics

Suppose we have a test tube with two substances of diffferent densitites inside. We want to use a centrifuge with a rotational radius of .2m to separate them. if we want to achieve a centripetal acceleration of 1000g, how fast does it have to spin/ (what

asked by Nicole on March 21, 2011
48. ## Algebra

A profit, P(X), for a certain item is a function relating the income from sales,S(X), and the cost of the item,C(X), The function is stated by the equation shown, where x is the number of items sold. P(X) = S(X) - C(X) When S(X) = 0.5x and C(X) = 10 +

asked by Nicolas on April 22, 2015
49. ## math

Ellen works for a high-speed rail company that wants to develop a new rail line. Ellen’s project is to find a train that is the second fastest in the world. The Shinkansen Bullet Train in Japan is reported to go as fast as 320 kilometers per hour. The

asked by Kayla on January 2, 2014
50. ## Language Art

3.)Why does the author organize "The Season's Curmudgeon Sees the light "as she does?(1 Points) A.)To contrast fall weddings & song with spring weddings & song B.)To contrast reading with gardening C.)To show how her feelings about spring have changed

asked by YRN DJ on November 20, 2015
51. ## Science

My physical science class is doing an experiment on the mass of pennies. I hypothesized that newer pennies would have less mass because cheaper materials are being used. I found that before 1982, pennies were made from 95% copper/5% zinc, and after 1982

asked by Beth on September 8, 2007
52. ## Chemistry

A reaction between gaseous sulfur dioxide and oxygen gas to produce gaseous sulfur trioxide takes place at 600◦C. At that temperature, the concentration of SO2 is found to be 1.14 mol/L, the concentration of O2 is 1.39 mol/L, and the concentration of SO3

asked by Olivia on April 23, 2016
53. ## math

the lions gate bridge in vancuver BC, is a suspension bridge that spans 1516m. Large cables are attached to the tops of the towers, 50m above the road. the road is suspended from the large cables with small vertical cables, the smallest one being 2m. find

asked by Navroz on April 18, 2010
54. ## Chemistry

We are given that the solubility product of platinum (II) sulfide is 9.9x10^-74 We are told to write a balanced equation for dissolving platinum (II) sulfide. I put : PtS(S) Pt^2+(aq) + S^2-(aq) and then we had to write the Ksp expression: Ksp=[Pt^2+][S2-]

asked by Kellie on May 3, 2017
55. ## Physics/Math

After flying for 15 min in a wind blowing 42 km/h at an angle of 30° south of east, an airplane pilot is over a town that is 50 km due north of the starting point. What is the speed of the airplane relative to the air? This is a vector equation. I would

asked by winterWX on February 3, 2007
56. ## Algebra

You provide the manager with a quadratic equation that models the expected number of ticket sales for each day x. (x = 1 is the day tickets go on sale). Tickets = -0.6x2 + 12x + 11 . Describe what happens to the ticket sales as time passes. My question is

asked by Samatha on January 25, 2012
57. ## inermediate algebra

A box with no top is to be made by cutting a 2-inch square from each corner of a square sheet of metal. After bending up the sides, the volume of the box is to be 220 cubic inches. Find The the length of a side of the square sheet of the metal that should

asked by tino on November 24, 2012

I need to find the order of a reaction with respect to the reactants. I set up my equation like this: 5.33e-2 M / 2.66e-2M = 1.03e-2 / 1.93e-3 I did the concentrations equal to the rates. I am just not sure what the units for rate should be. 2.00 = 5.33^m

asked by Hannah on February 28, 2012
59. ## Maths

John spends 380 dollars to buy the following two items sugar and salt, the amount is 100 bags, a bag of sugar is 2 dollars, a bag of salt is 5 dollars, how much did John bought each of it? I dunno how to write the equation and helps pls

asked by Jones on July 27, 2015
60. ## math

A rule of thumb used by car dealers is that the trade-in value of a car decreases by 30% each year. That is, the value at the end of any year is 70% of its value at the beginning of the year A.Suppose that you own a car whose trade-in value is presently

asked by kaylarae on April 7, 2010
61. ## algebra

Plumber chargers \$60 an hour. Plumber B chargers \$40 to visit your home plus \$55 for each hour. for hop many hours will the total cost for each plumber be the same? how much will that cost be? Define your variables: Write a system of equations: solve the

asked by kasidy on February 1, 2017
62. ## Algebra

The representative tells you that floor plan #1 sells for \$175,000 and floor plan #2 sells for \$200,000. She also mentions that all the available houses combined are worth \$7,200,000. Write an equation that illustrates this situation. Use the same

asked by Cathy on January 9, 2011
63. ## chemistry

Making the simplistic assumption that the dissolved NaCl(s) does not affect the volume of the solvent water, determine the constants m and b in the equation Molarity = m⋅density + b that relates the NaCl molarity to the NaCl(aq) density. Take the density

asked by Anonymous on May 28, 2013
64. ## Calc

Consider the surface xyz = 20. A. Find the unit normal vector to the surface at the point (1, 4, 5) with positive first coordinate. B. Find the equation of the tangent plane to the surface at the given point. Express your answer in the form ax + by + cz +

asked by Mike on October 10, 2007
65. ## Math

Im stuck plz help If a salesperson earns an annual salary of \$ 45,000 plus a 5.5 % commission on his sales,then the equation y = _______________ will express his annual earnings in relation tohis sales x. (a) \$45,000+0.055x (b)\$45,000 −0.055x (c) 0.055x

66. ## chemistry

A 0.2528 g sample of a mixture containing sodium carbonate and sand requires 12.32 mL of 0.2409 M HCl(aq). Assuming that the sand does not react with the HCl(aq), what percentage of the mixture is sodium carbonate? Balanced equation: Na2CO3(s) + 2 HCl(aq)

asked by Jordin on October 5, 2010
67. ## chemistry

Sodium peroxide reacts vigorously with water to produce sodium hydroxide and oxygen. The unbalanced equation is Na2O2(s) + H2O(ℓ) −! NaOH(aq) + O2(g) What mass of O2 is produced when 24 g of Na2O2 react? What mass of water is needed to react completely

asked by Linda on May 1, 2015
68. ## Chemistry

Iron metal is produced from the ore iron(III) oxide by reacting the ore with gaseous carbon monoxide at high tempature to produce liquid iron metal and gaseous carbon dioxide. How do you balanced this equation for this reaction?

asked by Nathan on November 19, 2011
69. ## maths

how do i solve this equation? there is another answer other than 0, but i am not sure how to get it. 5x^2 + 7x =0 factor the term: x(5x+7)=0 Either term can be zero. You found the x=0, what value of x makes 5x+7 zero? Factor it to this form: x (5x + 7) = 0

asked by minerva on January 12, 2007
70. ## Algebra

Joe Spout left a campsite on a trip down the river in a canoes, traveling at 6km/h. Four hours later, Joe's father set out after him in a motorboat. The motorboat traveled at 30km/h. How far had Joe traveled down the river when his father overtook him? How

asked by Deja on March 1, 2016
71. ## chemistry

The decomposition of N2O5 proceeds according to the following equation 2 N2O5(g) → 4 NO2(g) + O2(g). The rate constant, k, for the reaction at 298 K is 2.20 x 10-3 min-1. If a reaction is set up in a vessel at 298 K, with an initial concentration of

asked by anonymous on May 15, 2014
72. ## Chemistry

Write the balanced chemical equation for reaction the following chemical reaction ozone gas , O3 , reacts with 2,3,4,5-tetramethylheptane, CH3-CH(CH3)-CH(CH3)-CH(CH3)-CH(CH3)-CH2-CH3 , to produce carbon dioxide gas, CO2 , and water vapor, H2O

asked by Ashley on April 18, 2013
73. ## Chemistry..

A chemical engineer calculated that 15.0 mol H2 was needed to react with excess N2 to prepare 10.0 mol NH3. But the actual yield is 60.0% . Write a balanced chemical equation for the reaction. Is the amount of H2 needed to make 10.0 mol NH3 more than, the

asked by Anonymous on January 2, 2013
74. ## chemistry

iron 3 oxide reacts with carbon monoxide according to the following equation: fe2O3+3Co-->2Fe+3Co2 a) how many moles of ions are produced when one mole of iron 3 oxide reacts b) calculate the volume of carbondioxide produced when one mole of iron 3

asked by honeybee on September 6, 2010
75. ## math

The height of a ball that was batted into the air at 150 feet per second is a function of t, the time in seconds after the ball was hit. The height is determined by subtracting 15 times the square of t from 150 times t. Which equation can be used to find t

asked by Anonymous on January 22, 2012
76. ## Algebra 1 (Reiny)

I'm sorry but I'm confused about the steps you took in the part of the equation that you began to solve for me. Maria has 8 cups of a fruit punch that consists of 25% orange juice and 75% apple juice. She wants to make a drink that is 40% orange juice. How

asked by Victoria on June 3, 2014
77. ## Math - repost

The angles of elevation θ and ϕ to an airplane are being continuously monitored at two observation points A and B, respectively, which are 5 miles apart, and the airplane is east of both points in the same vertical plane. (Assume that point B is east of

asked by anonymous on March 17, 2019
78. ## Algebra

when the price for admission to a sporting event was \$100 per ticket, 50000 people attended the event. When the price increased to \$108, the attendance decreased to 45000 people. Which linear equation represents the attendance (d) in terms of the admission

asked by G-Money on April 6, 2016
79. ## chemistry

Silver chloride was formed when 10.10g of silver trioxonitrate(v) reacts with 14.10g of sodium chloride to form 9.58g of sodium trioxonitrate(v),write out the balance equation

asked by Esther on January 31, 2016
80. ## Chemistry

50.0 mL of a 0.20 mol/L HCl reacts with 60.0 mL of 0.15 mol/L NaOH. What is the pH of the final solution? I tried writing out the equation: HCl + NaOH = Cl + NaH2O Now, I am not sure of NaH2O is the right product or not.. However, I am still confused on

asked by Chachu on December 8, 2014
81. ## physics....

Suppose that the inside length of a microwave oven is 30 cm. If the length of a microwave oven is one half of the wavelength of microwaves used by the oven, find the frequency of the microwaves used in the oven. What is the equation that relates the three

asked by kennedy on June 13, 2012
82. ## chemistry

How do you write a redox reaction in an acidic environment for this? Cu^+2 + I- => CuI + I2 I understand that you get these equations for redox, but how do you put them in an acidic environment when there are no oxygens in the equation? 2I- => I2 + 1

asked by CHEMISTRY on January 30, 2011
83. ## Chemistry

Calculate the volume (in mL) of 9.0M H2SO4 that you would need to convert 0.070 moles of KAl(OH)4 to K2SO4 and Al2(SO4)3 according to the following equation: 2 KAl(OH)4 + 4 H2SO4->K2SO4 + Al2(SO4)3 + 8 H2O

asked by Cynthia on February 29, 2012
84. ## algebra

Tell whether equation represents direct variation. If so, identify the constant of variation 1. Y=8x Ans: yes, it represents direct variation because its in the form Y=kx. Constant of variation: 8 2. Y=2x+1 3. 3x+y=6 Please help, not too sure if I am

asked by **LB** on January 4, 2013
85. ## Algebra

Shark wireless charges 2 cents per text with a \$25 monthly fee while Nova cellular charges 4 cents per text with a \$15 monthly fee. Create a linear equation.

asked by Db on September 19, 2016
86. ## Little River

Jack and Jill invented a Trivia game in which a player can score 0,6 or 11 points on each turn.each player must take at least one turn.write an equation for a total score of 45 points in the game.

asked by Jeff on May 22, 2011
87. ## College Algebra

A ferris wheel has a diameter of 320 feet and the bottom of the Ferris wheel is 9 feet above the ground. Find the equation of the wheel if the origin is placed on the ground directly below the center of the wheel.

asked by Tyana on October 12, 2011
88. ## math

a ferris wheel has the diameter of 240 feet and the bottom of the ferris wheel is 9 feet above the ground. find the equation of the wheel if the origin is placed on the ground directly below the center of the wheel

asked by sn on October 5, 2011
89. ## algebra

A laboratory assistant is asked to mix a 30% alcohol solution with 21 liters of an 80% alcohol solution to make a 60% alcohol solution. How many liters of the 30% alcohol solution should be used? need help do not understand this question how would i set

asked by elementary and intermediate algebra on March 8, 2015
90. ## Differential Equations, Matrices

Using the matrix [cosx -sinx] [sinx cosx] rotate the parabola y=3x^2+2 by 45 degrees. State the equation of the rotated parabola and then state the coordinates of the rotated vertex and the points (-1, 5) and (1, 5)

asked by Anne on February 15, 2014
91. ## Math Help

The length of an object in feet is equal to 3 times its length in yards. The length of a waterslide is 48 feet. Write and solve a multiplication equation to find the length of the waterslide in yards.

asked by Anna on January 30, 2012
92. ## Math

1. Write the equation rule and find the twentieth term in the sequence: 1/2,2/3, 3/4, 4/5... My answer: The rule is x/x+1. The twentieth term in the sequence is 20/21. Please check my answer and tell me if it's correct or incorrect. I'm confused. Thanks.

93. ## math

if you walk for m minutes, the number c of calories used is proportional to the time you walk. if 30 caloris are used when you walk for 12 minutes, write an equation of variation and find the number of calories used when you walk for an hour

asked by rozzell on September 25, 2011
94. ## Chemistry

A ground state hydrogen atom absorbs a photon of light having a wavelength of 93.03 nm. It then gives off a photon having a wavelength of 1005 nm. What is the final state of the hydrogen atom? What is the equation to solve this?

asked by Emma on April 7, 2016
95. ## pre-algebra

a woman jogging at 6 mph passes a man biking the in opposite direction at 12 mph. If they maintain there speed, how far from each other will they be 10 minutes after passing? I tried 12 divided by 10 + 6 divided by 10 = 1.8 but I am not sure if that answer

asked by mason on September 8, 2006
96. ## Maths

Solve this equation fo rx in the interval 0

asked by Edward on April 11, 2007
97. ## Chemistry (Dr.Bob222)

The half-life of P-32 is 14 days. How long after a sample is delivered can a laboratory wait to use a sample in an experiment if they need at least 10 percent of the original radioactivity? I need help on how to set up this problem. What is the general

asked by K on November 7, 2013
98. ## Math HELP FAST PLEASE

liz earns a weekly salary of \$459 and \$20 per hour for each overtime hour she works. this week her total pay including salary and overtime pay was \$559. write an equation to represent this situation. how many hours of overtime did liz work?

asked by Anon on November 9, 2011
99. ## math

Help me write the step by step for the use of linear equation from the following: A vehicle that gets 30 MPG will cost you \$903 less to fuel each year than one that gets 20 MPG (assuming 15,000 miles of driving annually and a fuel cost of \$3.61). Over a

asked by PJ on April 13, 2013
100. ## calculus

Consider a plane curve which is described in polar coordinates (r, @) by r = g(@) for @ for all [a,b] (@ representing theta). Starting from the known expression for the length of a plane curve in Cartesian coordinates and the equation x = rcos@, y = rsin@,

asked by mark on September 22, 2008