# why does the equation x^2=-9 has no real solution why does the equation x^2 = 9 has two solutions

56,329 questions, page 297
1. ## English

Identify the sentence that is punctuated correctly. a) These products may not seem as exciting as they did in the past but maybe that's the time to do a little buying. b) Prior to Webster's complete two-volume edition he had compiled three shorter and

asked by Rebe on May 17, 2018
2. ## Math check 3

f(x) = 1/(x+7)+15/(x-8). Find all a for which f(a)=f(a+15). I understand this so far f(a)=f(a+15) 1/(7+a) + 15/(a-8) = 1/(a+22) + 15/(a+7) I have multiplied the LCD of (a-8)(a+7)(a+22)by both sides with no luck. This is a multiple choice question a.)

asked by Shawn on October 12, 2008
3. ## math

Write an equation to represent each situation: 1)Juanita has 102 beads to make n necklaces. Each necklace will have 17 beads. 2)Craig is c years old. His 12-year-old sister Kaitlin is 3 years younger than Craig. 3)Kim rented skates for h hours. The rantal

asked by Sam on February 25, 2015
4. ## Chemistry

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g

asked by Mandy on May 19, 2008
5. ## Chemistry

You need to prepare 1.000 L (in a volumetric flask) of 0.50 M phosphate buffer, pH 6.77. Use the Henderson Hasselbalch equation with a value of 6.64 for pK2 to calculate the quantities of K2HPO4 and KH2PO4 you need to add to the flask. What concentrations

asked by Anonymous on October 20, 2010
6. ## Maths, Physics, Resultant force

Hi all, I have been given component x- and y- for F1=(8.0*10^7N,7.0*10^7N) F2=(4.0*10^7N,-2.0*10^7N) for an object. Which following my textbooks have found the following vector components: F1+F2=(1.2*10^8N,5.0*10^7N) Now I want to find the distance from

asked by Anon on October 19, 2017
7. ## Chemistry

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g

asked by Mandy on May 19, 2008
8. ## CHEMISTRY

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g

asked by Mandy on May 19, 2008
9. ## Chemistry

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g

asked by Mandy on May 19, 2008
10. ## Chemistry

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g

asked by Mandy on May 19, 2008
11. ## Algebra 2

Abey Numkena is an interior designer. She has been asked to locate an oriental rug for a new corporate office. As a rule, the rug should cover 1/2 of the total floor area with a uniform width surrounding the rug. a. if the dimensions of the room are 12

asked by Ashley V on November 6, 2007
12. ## Maths, Physics, Resultant force

Hi all, I have been given component x- and y- for F1=(8.0*10^7N,7.0*10^7N) F2=(4.0*10^7N,-2.0*10^7N) for an object. Which following my textbooks have found the following vector components: F1+F2=(1.2*10^8N,5.0*10^7N) Now I want to find the distance from

asked by Anon on October 18, 2017
13. ## Chemistry

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g

asked by Mandy on May 19, 2008
14. ## CHEMISTRY

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g

asked by Mandy on May 19, 2008
15. ## Chemistry

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g

asked by Mandy on May 19, 2008
16. ## Chemistry

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g

asked by Mandy on May 19, 2008
17. ## CHEMISTRY

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g

asked by Mandy on May 19, 2008
18. ## Chemistry

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g

asked by Mandy on May 19, 2008
19. ## math;)

Apollo 8 orbited the moon in a circular orbit. Its average altitude was 185 km above the moon's surface. Create an equation to model the path of Apollo 8 using the center of the moon as the origin. Note that the radius of the moon 1,737 km. a.

asked by girly girl on December 1, 2017
20. ## math

un Lanes Bowling charges a fee of \$4 to use their shoes and \$6 for each game played. Salim wants to figure out how much it will cost him to bowl. Part 1: Write an equation representing this problem. Let x be the number of games bowled, and let y be the

asked by Madison on June 17, 2014
21. ## CHEMISTRY

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g

asked by Mandy on May 19, 2008
22. ## chemistry

Using the following equation 2C2H2 + 5O2 -> 4CO2 + 2H2O what volume of oxygen would be needed to react with 89.6L of C2H2 at a temp of 273 and a pressure of 101.3 kpa. I can't seem to figure out my first step. Using PV=NRT should I do initial and final

asked by danielle on February 3, 2016
23. ## chemistry

In an experiment a student allowed benzene C6H6+ TO REACT WITH EXCESS BROMINE BR2+ In an attempt to prepare bromobenzene C6H5Br. This reaction also produced as a by-product, dibromobenzene, C6H4Br2+ On the basis of the equation. What is the maximum amount

asked by Dolly on November 1, 2012
24. ## CHEMISTRY

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g

asked by Mandy on May 19, 2008
25. ## CHEMISTRY

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g

asked by Mandy on May 19, 2008
26. ## Chemistry

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g

asked by Mandy on May 19, 2008
27. ## Chemistry

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g

asked by Mandy on May 19, 2008
28. ## Chemistry

im a little confuse on this problem. "in the production of copper from ore containing copper(II) sulfide, the ore is first roasted to change it to the oxide according to the following equation: 2CuS + 2O2 --> 2CuO + 2CO2 [i already balanced it] A. If 100 g

asked by Mandy on May 19, 2008
29. ## Physics

A particle of charge +18.5C and mass 4.84 × 10-5 kg is released from rest in a region where there is a constant electric field of +578 N/C. What is the displacement of the particle after a time of 1.89 × 10-2 s? 1) F=Eq 2) a=F/m 3) d=vt+1/2at^2 1) F=

asked by Salah on February 7, 2015
30. ## science

How much work will be necessary for the band members to move the new 120 kilogram amplifier to the garage where they practice, if they were to slide the amplifier a distance of 35 meters on a frictionless surface at an acceleration of 2 meters/second? Show

asked by anonymous on November 4, 2009
31. ## Chemistry

Calculate the value of the solubility product (Ksp) for CdS given the following standard reduction potentials: CdS + 2e- --> Cd + S-2 E° = -1.21V Cd+2 + 2e- --> Cd E° = -0.402V --------------------------------------- CdS + Cd --> Cd + Cd+2 + S-2 E° =

asked by Andrew on March 30, 2009
32. ## Pre.Calc

You want to make an investment in a continuously compounding account over a period of ten years. What interest rate is required for your investment to double in that time period? Round the logarithm value to the nearest hundredth and the answer to the

asked by Julissa on March 14, 2015
33. ## math

1) If y=kx, where k is a constant, and y=128 when x=16, what is the value of y when x is increased by 25%? (I got 160?) 2) Aaron calculates using a certain foot and line spacing, that each page of a typed document contains at least 240 words and at most

asked by Aline on February 13, 2018
34. ## ap chemistry

home / study / questions and answers / science / chemistry / balance the following example of a heterogeneous ... Your question has been answered! Rate it below. Let us know if you got a helpful answer. . Question Balance the following example of a

asked by martika on September 29, 2015
35. ## MATH GRADE 10****

Scott, Arif, and Diane run a small delivery company. For thier business, they use licensed two-way radios with a 20 km range. Scott is at their office which they have marked as the origin on their map of the town. Arif is dropping off a package at (-8, 16)

asked by alyssa on December 25, 2009
36. ## chemistry HMWK help....... REPOST

you decide to have a BBQ in your backyard. you have 1Kg of pentane (C5H12) in the tank. What is the amount of carbon dioxide (in mass and mols) you will be contributing to the greenhouse gas effect by using up that 1Kg of pentane? plz.... need the answer

asked by tarkan on November 11, 2010
37. ## Chemistry

Hello, I need help with calculations for lab. I prepared excess NaOH and HCL solutions (unknown conc., ~0.1M). Then I standardized my NaOH solution by titrating known amounts of KHP (Potassium hydrogen phthalate)with it in the presence of phenolphthalein

asked by Pavel on September 20, 2009
38. ## chemistry

If you know that the mass concentration of a NaCl solution is 58.5 g/L, the molar concentration (mol/L) of the solution is ? can sum1 help me plz 1 mol of NaCl has a mass of what? 58.5 g NaCl x (1 mol NaCl/molar mass NaCl) = mols NaCl on 58.5 gg NaCl. Mols

asked by brett on June 13, 2006
39. ## chemistry

Assuming that the total volume does not change after 0.200 g of KCl is added to 1.0 L of a saturated aqueous solution of AgCl, calculate the number of moles of Ag+ ion in the solution after equilibrium has been reestablished. For AgCl, Ksp = 1.8 × 10¯10

asked by Stacy on November 16, 2011
40. ## Chem AP

A 0.505-g sample of a compound is dissolved in enough water to form 100.0 mL of solution. This solution has an osmotic pressure of 2.56 atm at 25°C. If each molecule of the solute dissociates into two particles (in this solvent), what is the molar mass of

asked by Me on February 2, 2014
41. ## Re chemistry

What are the concentrations in mass of the following solutions: a) a 200mL aqueous solution containing 4.26g sodium solfate. b) a 2.00 L aqueous solution containing 107.0g ammonium chloride NH4Cl. Plz can give me someone the answers for BOTH and the steps

asked by Tarkan on December 5, 2010
42. ## Chemistry

A solution was prepared by adding 15mL of 0.129 M KI, 5mL of 0.1 M Na2S2O3, 1mL of starch solution, and 15mL of 0.125 M (NH4)2S2O8. Calculate the concentration of (M) of I in the final mixture before the chemical reaction.

asked by Brian on October 3, 2008
43. ## chemistry

A stock solution containing Mn2+ ions was prepared by dissolving 1.168 g pure manganese metal in nitric acid and diluting to a final volume of 1.000 L. Calculate the concentration of the stock solution.

asked by rachel on August 9, 2012
44. ## chemistry

2. 50.0 mL of 1 M NaOH(aq) and 50.0 mL of 1 M HNO3(aq), both initially at 18.6°C, were mixed in a Styrofoam cup calorimeter. The temperature of the solution rose to 25.4°C. How much heat was released? Assume that the heat capacity and density of the

asked by owen on January 24, 2017
45. ## Chemistry

When 10.00 mL of 1.00 M HCl solution is mixed with 115 mL of 0.100 M NaOH solution in a constant-pressure calorimeter, the temperature rises from 22.45 °C to 23.25 °C. Calculate q for this reaction, assuming that the heat capacity of the calorimeter is

asked by Patricia on April 17, 2017
46. ## Chemistry

If 35.00 mL of 0.25 M NaOH(aq) is mixed w/ 20.00 mL of 0.400 M HClO4(aq), the result solution would be: So apparently the correct answer is BASIC, but I thought it would be neutral because the resulting solution would contain NaClO4 which has components of

asked by sea lively on July 30, 2018
47. ## Chemistry

H2C2O4 * 2H2O (s) is a primary standard substance. 2.3688 grams of oxalic acid dihydrate were completely neutralized by 42.56 milliliters of NaOH solution. Calculate the molar concentration of the NaOH solution.

asked by Cassie on March 26, 2011
48. ## Chemistry

A solution contains 0.0273 M HNO3, 0.0302 M HI, and 0.320 M formic acid, HCOOH. What is the pH? A solution contains 0.160 M Ba(OH)2 (strong base) and 0.360 M ammonia, NH3 (weak base). What is the pH? I'm really not sure how to do this. I tried and got .443

asked by Anonymous on March 2, 2013
49. ## Chemistry

consider 1.0 L of a solution which is 0.55 M HF and 0.2 M NaF (Ka for HF = 7.2 x 10-4). Calculate the pH after 0.10 mol of HCl has been added to the original solution. Assume no volume change on addition of HCl. Goes along with the last one i posted, i

asked by Chris on November 30, 2012
50. ## Chemistry

Stock solution A is prepared by dissolving 182 mg of ferrous ammonium sulfate in water and diluting to volume in a 500-mL volumetric flask. Calculate the concentration of iron, in ppm, in stock solution A.

asked by Anonymous on October 8, 2018
51. ## algebra

Solve the system of equations using the addition (elimination) method. If the answer is a unique solution, present it as an ordered pair: (x, y). If not, specify whether the answer is "no solution" or "infinitely many solutions" and state how you arrived

asked by Gail on March 24, 2009
52. ## chemistry

determine the solubility product of the slightly soluble salt calcium oxalate,cac2o4 by titrating 200cm^3 sample of a suturated solution of this salt with 0.00135mol dm^3 HCl solution.calculate Ksp?

asked by promise on August 6, 2012
53. ## Chemistry

Aqueous ammonia is typically sold by chemical supply houses as the saturated solution, which has a concentration of 14.5mol/L. What volume of NH3 at STP is required to prepare 100. mL of concentrated ammonia solution?

asked by Shashi on May 1, 2013
54. ## Chemistry

What is the pH, pOH, [H+] and [OH-] for a solution that contains 5.25 x 10^-3 moles of HCl dissolved in 3.25 L of water? I was gone the day my teacher explained this and I'm completely lost on what to do. An outline of steps needed to solve the problem

asked by Joey on May 8, 2015
55. ## Chemistry

If a solution containing 118.44 g of mercury(II) perchlorate is allowed to react completely with a solution containing 17.796 g of sodium sulfide, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain

asked by Noelle on April 1, 2014
56. ## Organic Chemistry

Cu++ forms a blue-green complex with tetraphenylporphin in a 1:1 ratio. Say you have 100 mL of a 2.0 x 10^-4 solution of the Tetraphenylporphin. Exactly what weight of CuCl2 must be added to the solution to insure complete complexation without any excess

asked by Jessica on December 9, 2014
57. ## chemistry

A 1.0 L sample of an aqueous solution contains .1 mol of NaCl and .1 mole of CaCl2. What is the minimum number of moles of AgNO3 that must be added to the solution in order to precipitate all of the Cl(1- charge) as AgCl?(assume that AgCl is insoluble.)

asked by corey on October 3, 2007
58. ## chemistry

2. 50.0 mL of 1 M NaOH(aq) and 50.0 mL of 1 M HNO3(aq), both initially at 18.6°C, were mixed in a Styrofoam cup calorimeter. The temperature of the solution rose to 25.4°C. How much heat was released? Assume that the heat capacity and density of the

asked by punch on January 24, 2017
59. ## chem

If a solution containing 88.445 g of mercury(II) perchlorate is allowed to react completely with a solution containing 13.180 g of sodium sulfide, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain

asked by qwaszx on February 1, 2016
60. ## Analytic Chemistry

At 25 °C, you conduct a titration of 15.00 mL of a 0.0260 M AgNO3 solution with a 0.0130 M NaI solution within the following cell: Saturated Calomel Electrode || Titration Solution | Ag (s) For the cell as written, what is the voltage after the addition

asked by Dasha on May 17, 2015
61. ## Re: PHYSICS

A stationary block explodes into two pieces L and R that slide across a frictionless floor and then into regions with friction, where they stop. Piece L, with a mass of 2.0 kg, encounters a coefficient of kinetic friction µL = 0.40 and slides to a stop in

asked by COFFEE on February 27, 2007
62. ## Macroeconomics

Please check my answers; stuck on a few questions on my homework. 1. In the long run, an increase in the supply of bank loans is matched by a __________ in the price level and the quantity of real loans is __________. A. rise; unchanged B. rise; increased

asked by Beth on April 5, 2015
63. ## Chemistry

Hello, I really don't understand how to find the grams of moles in some of these reactions. If someone could help I would appreciate it. 1) Balance the following chemical reaction and determine the number of moles of HI produced when 2.33 moles of H2(g)

asked by Anonymous on February 19, 2017
64. ## Chemistry

Neutralization reaction HCL(aq) + NaOH(aq) -> NaCl(s) + H2O(l) Use your results to determine the netball change of the neutralization reaction, in kJ/mol of NaOH, Write the thermochemical equation for the neutralization reaction. I'm not sure how to even

asked by Julie on March 9, 2015
65. ## math

A smart-phone is thrown upwards from the top of a 240-foot building with an initial velocity of 32 feet per second. The height h of the smart-phone after t seconds is given by the quadratic equation h=-16t^2+32t+240. When will the smart-phone hit the

asked by miguel on August 6, 2013
66. ## Chemistry

At 1100 K, Kp=0.25 for the following reaction. 2SO2(g) + O2(g) (reversible arrows) 2SO3(g) What is the value of K at this temperature? This is what I have so far: I did Kc=0.25(1100(0.0821))^-1 and got Kc=0.00276. That is incorrect. Why? What did I do

asked by Taasha on July 31, 2007
67. ## Math

A local gym charge nonmembers \$ 19 per hour to use the tennis courts. Members pay a yearly fee of \$300 and \$4 per hour for using the tennis courts. Write and solve an equation to find how many hours you must use the tennis courts to justify becoming a

asked by Ricky on January 7, 2008
68. ## AP Calculus.HELP!

Water runs into a conical tank with radius 5 and altitude 10 at a constant rate of 2 cu.ft. per min. How fast is the water rising in the tank at any instant? You want dh/dt, given dV/dt. so write an equation relating V to h. V= 1/3 Areatop*h, in this case

asked by Sarah on October 26, 2006
69. ## Chemistry Help Please!!!

For each of the reactions below give a balanced equation. 1)Methane (CH4) with chlorine to give chloroform (CHCL3)and hydrogen cloride. 2) Sodium Hydroxide with phosphoric acid. 3)sodium carbonate with sulfuric acid. 4) sodium sulfide with hydrochloric

asked by Kimberly on March 26, 2012
70. ## Algebra

you start a pet sitting service. you spend \$35 on advertising. You plan to change \$5 on a day to watch each pet. a) write an equation to relate your daily income y to the number of pets x you watch. b) how many days do you need to watch a pet to pay for

asked by Matt on June 16, 2011
71. ## Math

Polluted water flows into a pond. The concentration of pollutant in the pond at the t minutes is modelled by the equation c(t)= 9-90,000(1/10000+3t), where c is measured in kilograms per cubic metre. a) When will the concentration of pollutant in the pond

asked by Cindy on October 25, 2017
72. ## chemistry

Pentane (C5H12) and hexane (C6H14) form an ideal solution. At 25oC the vapor pressures of pentane and hexane are 511 and 150 torr, respectively. A solution is prepared by mixing 25 mL pentane (density, 0.63 g/mL) with 45 mL hexane (density, 0.66 g/mL).

asked by savanna on October 5, 2016
73. ## college chemistry

.361 g of a non-volatile solute is dissolved in 160.0 g of water. The solute does not react with water nor dissociate in solution. Assume that the resulting solution displays ideal Raoult's law behaviour. At 90 oC the vapour pressure of the solution is

asked by silver on February 18, 2011
74. ## Chemistry AP

At 20◦C the vapor pressure of pure methanol (CH3OH) is 89.0 torr and of pure water (H2O) is 17.5 torr. A solution of methanol and water has a total vapor pressure of 35.5 torr at 20◦C. Calculate the mole fraction of methanol in this solution. Assume

asked by Ethan on March 3, 2015
75. ## physics

The question is: a horizontal force of magnitude 22.0 N is applied to a 2.86 kg book as the book slides a distance d = 0.73 m up a frictionless ramp at angle θ = 30°. The book begins with zero kinetic energy. What is its speed at the end of the

asked by mary on June 7, 2009
76. ## mary

The question is: a horizontal force of magnitude 22.0 N is applied to a 2.86 kg book as the book slides a distance d = 0.73 m up a frictionless ramp at angle θ = 30°. The book begins with zero kinetic energy. What is its speed at the end of the

asked by physics on June 7, 2009
77. ## Chemistry

26.0246 g of sodium carbonate is dissolved in water and the solution volume adjusted to 250.0 ml in a volumetric flask. A 25.00 ml sample of an unknown hydrochloric acid solution required 32.06 ml of the sodium carbonate solution for complete reaction.

asked by Blaine on September 9, 2015
78. ## calculus please help me

Let f(x)=9sinx/2sinx+4cosx. Then 'f(x)= ((2sinx+4cosx)(9cosx)-(9sinx)(2cosx-4sinx))/(2sinx+4cosx)^2. The equation of the tangent line to y=f(x) at a=2 can be written in the form y=mx+b where m= 9and b= ______.?????

asked by Leslie on May 7, 2008
79. ## Math

It takes Lin 1 hour to drive 62 miles,2 hours to drive 130 miles,and 3 hours to drive 195 miles. Write an equation for the relationship.Tell what the variables represent

asked by Sakhya on April 8, 2019
80. ## Calculus

Points (–1, 6) and (–3, 2) are endpoints of the diameter of a circle. (a) What is the exact length of the diameter? (Simplify as much as possible) Answer: ________ (b) What is the center of the circle? Answer: ____________ (c) What is the equation of

asked by Brian on March 10, 2012
81. ## michelle

An object moving vertically is at the given heights at the specified times. Find the position equation s = at2 + v0t + s0 for the object given the following conditions. • At t = 1 seconds, s = 48 feet • At t = 2 seconds, s = 64 feet • At t = 3

asked by Anonymous on November 30, 2016
82. ## Math

Rebecca buy some scarves that cost five dollars each and two purses that cost 12 each The cost Rebecca’s total purchase is \$39 which equation can be used to find in the number of scarves that Rebecca buys A. 5+24n=39 B.5+24=39 C. (24+5)n=39 D.24•5+n=39

asked by Meowwww on January 14, 2019
83. ## Math

Rebecca buy some scarves that cost five dollars each and two purses that cost 12 each The cost Rebecca’s total purchase is \$39 which equation can be used to find in the number of scarves that Rebecca buys A. 5+24n=39 B.5n+24=39 C. (24+5)n=39

asked by Meowwww on January 14, 2019
84. ## Algebra-Graphing Linear Equation

Y

asked by G on March 8, 2008
85. ## Math

In a middle school computer club, 3/8 of the members are girls. Of the girls in the club, 2/5 are 6 graders. Write and solve an equation to find the fraction of the members of the club that are 6 grade girls

asked by Tom on May 4, 2017
86. ## Calculus

consider the function y = 2sinx a) determine dy/dx b) calculate the exact value of x for which the slope of the tangent to the graph is √2 in the interval [0, pie] c) determine the equation of the tangent in part (b). d) determine the y-intercept of the

asked by Sarah Berkley Adamson on June 21, 2012
87. ## math

a newborn infant usually tripples its birthday weight by its first birthday. baby carter weighed 28 pounds on his first birthday. if this were tripple his birth weight (b), which equation below could be used to determine his birth weight? 1)b/3=28 2)b-3=28

asked by Anonymous on May 10, 2010
88. ## Algebra

the table shows the height of a plant as it grows. which equation in point-slope form gives the plant's height at any time? Time)months) 2 4 6 8 Plant height (cm) 18 36 54 72 a.y+18=9(x+2) b.y-18=9x+2 c.y-18=9(x-2) d.the relationship is nonlinear

asked by Mary Anne on December 1, 2015
89. ## Math

A new born infant usually triples its birth weight by its first birthday.Baby carter weighted 28 pounds on his first birthday. If this were triple his birth weight (b), which equation below could be used to determine his birth weight? (1) b/3=28 No sure

asked by Mydogbear on May 6, 2017
90. ## Algebra II

Solve the following word problem using a linear equation: John has been recently looking at his phone bill. It costs \$2.65 for a 4 minute call and \$4.75 for a 10 minute call. How much will it cost John for a 30 minute call?

asked by Danielle on September 13, 2008
91. ## Math

Use differentials (or equivalently, a linear approximation) to approximate sin(27 degrees) as follows: Let f(x) = sin(x) and find the equation of the tangent line to f(x) at a nice point near 27 degrees. Then use this to approximate sin(27 degrees).

asked by Anonymous on December 12, 2014
92. ## calculus

hi we have been given a graph and we need to fing its equation. the graph is logistic. we are asked to take any six points on it and then apply appropriate log to get a straight line. i don't know how to get that straight line? i just know for exponential

asked by thoung on June 11, 2009
93. ## Calculus

Consider the equation: x^2 - 2xy + 4y^2 = 64 Write an expression of the slope of the curve at any point. (y^p)= y prime My work 2x - 2(xy^p + y) + 8yy^p = 0 2x -2xy^p - 2y + 8yy^p = 0 -2xy^p + 8yy^p = 2y -2x factored out y^p and then divided to get (2y -

asked by Anonymous on October 29, 2008
94. ## math

parallel and perpendicular lines Determine an equation of each of the following lines . *the line perpendicular to y-4=0 and passing through the point (-1,6) ** the line perpendicular to 3x-12y+16=0 and having the same y-intercept as the line 14x-13y-52=0

asked by mota on January 8, 2008
95. ## math,help.algebra

I am stuck form this point i need help. the problem states: A ball is thrown upward from the roof of a building 100 m tall with an initial velocity of 20 m/s. Use this information for exercises 35 to 38. Science and medicine. When will the ball reach a

asked by jasmine20 on April 4, 2007
96. ## Physics

Another Question---- A ball of clay of mass m travels with a velocity v in a path tangent to a disk of radius R and mass M. The clay collides with the disk tangentially to its outer rim (a totally inelastic collision) and the clay and disk begin to spin

asked by bobby on August 3, 2007
97. ## Physics/Statistics

We're actually learning propigation of error in my chem class, but it seems to be used equally as much in Physics/Stats. My teacher showed us two methods of doing it: REAL Method (Addition/Subtraction): square root[(error absolute 1)^2 + (error absolute

asked by Amiga on September 14, 2006
98. ## physics

A rocket has a per-ignition mass of 1100kgs-1 producing a thrust of 10000N. How long after ignition of the fuel will the rocket lift off? also explain how is it possible for a rocket to accelerate in space. (i cant work it outt. i know it involves the

asked by beavis on February 15, 2012
99. ## Science

Equation for the reaction which took place: Hydrochloric acid + calcium carbonate -> calcium chloride + carbon dioxide + water When the reaction stopped the total mass had decreased from 102.5g to 101.4g. some water had evaporated from the beaker what else

asked by afghandon on June 29, 2014
100. ## Chemistry

6 FeCl2(aq) + K2Cr2O7(aq) + 14 HCl(aq) ==> 6 FeCl3(aq) + 2 CrCl3(aq) + 2 KCl(aq) + 7 H2O(l) How many milliliters of 0.0750 M K2Cr2O7(aq) will react with 0.038 mol of FeCl2(aq)? I used the equation Molarity=Mole/Volume and divided my answer by 1000 to get

asked by Cassie on February 6, 2014