# Christine

Popular questions and responses by Christine
1. ## maths

Starting from one oasis, a camel walks 25km in a direction 30 degrees south of west and then walks 30km toward the north to a second oasis. What distance separates the two oases?

asked on June 6, 2011
2. ## Physics!

The following four forces act on 4.00 kg object: F1 = 300 N east F2 = 700 N north F3 = 500 N west F4 = 600 N south What is the acceleration of the object?

asked on November 1, 2011
3. ## Chemistry

Write a balanced equation for the combustion of gaseous ethane (C2H6) a minority component of natural gas, in which it combines with gaseous oxygen to form gaseous carbon dioxide and gaseous water.

asked on November 6, 2012
4. ## balanced equation

? MnO4– + ?H+ + ?C2O42– --> ?Mn2+ + ?H2O + ?CO2 what's the balanced equation? correct coefficients? is it 1MnO4- + 2H+ + 1C2O42- --> 1Mn2+ + 1H20 + 2CO2 ? c2042..? are you missing parenthesis somewhere? oh i see, no i believe this is correct: MnO4- +

asked on April 29, 2007
5. ## KISWAHILI

Eleza maana ya misemo ifuatwayo a)giza la ukata..... b)meza mate machungu

asked on April 21, 2019
6. ## chem--please help me check my answer!!

write an ionic and net ionic equation for the following reaction between Fe3+ and NH4OH. Please check my answer!! Thank you. My answer is: ionic: Fe3+(aq) + NH4OH--> Fe(OH)3 + NH4+ net ionic: Fe3+ +OH- -->Fe(OH)3

asked on October 25, 2010
7. ## math

Electrical system are governed by Ohm's law, which states that V = IR, where V=voltate, I=current, and R=resistance. If the current in an electrical system is decreasing at a rate of 9 A/s while the voltage remains constant at 14 V, at what rate is the

asked on May 2, 2010
8. ## calculus

can you please help me solve this problem if dy/dx=ycosx and y=3 when x=0, then y=

asked on March 20, 2011
9. ## Trig

A Ferris wheel is 40 meters in diameter and boarded from a platform that is 4 meters above the ground. The six o'clock position on the Ferris wheel is level with the loading platform. The wheel completes 1 full revolution in 2 minutes. How many minutes of

asked on February 13, 2013
10. ## Language Arts

Which of the following citations from The Watsons Go to Birmingham---1963 illustrates how the setting affects Byron? A. The way Byron kept his head down and was smiling and saying “Yes, ma’am” this and “No, ma’am” that, it looked like he had

asked on January 20, 2016
11. ## math

A 154-lb person burns 420 calories per hour riding an exercise bicycle at a rate of 15 mi/h. Write a function rule to represent the total calories burned over time by that person. Explain how the information in the problem relates to the function. Thank

asked on December 8, 2012
12. ## Chemistry

what is the difference between a basic bunsen burner and the tirrll burner

asked on September 24, 2010
13. ## chemistry

Write a net ionic equation for the reaction of the aqueous species ammonia and hydrofluoric acid. I don't think mine is coming out right- I don't know how NH3 reacts with other species, because I end up getting hydrogen as both an anion and a cation in the

asked on April 29, 2007
14. ## Chemistry

Write the dissociation equation for iron(II) ammonium sulfate hexahydrate in water . Fe(NH4)2(SO4)2 * 6H2O --> __?________ I know dissociate means to take apart so for example; NaCl would look like Na^+ + Cl^- And another one like: Fe2(SO4)3 would look

asked on October 4, 2015
15. ## physcial science

What are the wavelength limits of the audible range of the sound spectrum? (Use the speed of sound in air. The speed of sound in air is 344 m/s. The audible range of the sound spectrum contains frequencies as low as 30 Hz and as high as 25 kHz.)

asked on June 23, 2015
16. ## Chemistry

Which type of intermolecular forces would be expected in a sample of F2 gas? a. London forces, dipole interactions, and ionic interactions b. dipole interactions c. London forces d. London forces and dipole interactions I believe C is the correct answer.

asked on June 13, 2018
17. ## Chemistry

Suppose you have two solutions to titrate with NaOH: (a) 10 ml of.1M HCL (b) 10 ml of .1M CH3COOH would you expect either of the solutions to require different volumes of NaOH in order to reach an end point? Explain

asked on December 9, 2011
18. ## Physics

A 1000-kg car is driving toward the north along a straight road at a speed of 20.0 m/s. The driver applies the brakes and the car comes to a rest in a distance of 140 m. What is the constant force applied to the car to bring it to rest?

asked on November 1, 2011
19. ## Chemistry

Write a balanced equation for the incomplete combustion of gaseous pentane (C5H12) which combines gaseous oxygen to form carbon dioxide, gaseous water and carbon monoxide.

asked on November 6, 2012
20. ## Chemistry - Rate Determining Step

The rate law for the reaction 2NO (g) + Cl2 (g) -> 2NOCl (g) is given by rate = k[NO][Cl2] A mechanism involving the following steps has been proposed for the reaction: NO (g) + Cl2 (g) -> NOCl2 (g) NOCl2 (g) + NO (g) -> 2NOCl (g) If this mechanism is

asked on February 6, 2007
21. ## Math

Find the radius of a sphere with a volume of 1,767.1 m (3 cubed) would I use the formula V=4/3*pie*radius (3 cubed)

asked on October 29, 2014
22. ## 5th grade Math

A recipe call for the following ingredients: 3c flour 1/2t salt 3/4c sugar 4c fruit 2T butter To make 2/3 of the recipe, how much of each ingredient should you use. Question, should I multiply of divide by 2/3?

asked on September 20, 2014
23. ## Chemistry Need Help

How many grams of baking soda, NaHCO3, are needed to react with 125 mL of stomach acid having an HCl concentration of 0.05984 M? The reaction is NaHCO3(aq) + HCl(aq) → NaCl(aq) + CO2(g) + H2O(l). Do I need to chenage mL to L first? I'm really stuck with

asked on March 1, 2015
24. ## chem

a 6.54 g sample consisting of a mixture of silver nitrate and sodium nitrate is dissolved in water. this mixture then reacts with barium chloride to for 3.50 g of silver chloride. calculate the percent by mass of silver nitrate in the first mixture

asked on December 14, 2010
25. ## Physics

The gravitational potential difference between the surface of a planet and a point P, 10 m above the surface, is 8.0 J kg-1. Assuming a uniform field, what is the value of the gravitational field strength in the region between the planet’s surface and

asked on January 19, 2011
26. ## Chemistry

What is the solubility of PbI2 in 0.4 M KI given the solubility constant of PbI2 is 7.1 x 10-9 a. 3.5 x 10-3 M b. 1.2 x 10-3 M c. 4.4 x 10-8 M Ksp = 7.1 x 10-9 Ksp = x * (2 * 0.4) (7.1 * 10-9)/.8 = x 8.8 x 10-9 = x ------ But this is not one of the

asked on June 13, 2018
27. ## physics

1.) A small sphere of charge 2.4 μC experience a force of 0.36 N when a second sphere of unknown charge is placed 5.5 cm from it. What is the charge of the second sphere? 2.) Two identically charged sphere placed 12 cm apart have an electric force of0.28

asked on March 20, 2011
28. ## Math

The dimensions of a gift box are consecutive positive integers such that the height is the least integer and the length is the greatest integer. If the height is increased by 1 cm, the width is increased by 2 cm, and the length is increased by 3 cm, then a

asked on June 7, 2009
29. ## Chemistry

The density of water at 30*C is 0.9956g/mL. If the specific gravity of acetic acid is 1.040 at 30*C, what is the density of acetic acid at 30*C?

asked on February 23, 2015
30. ## Biochemistry

An enzyme-catalyzed reaction was carried out in a 0.2M �Tris� buffer, pH 7.8. As a result of the reaction, 0.03 mole/liter of H+ was produced. (pKa of Tris =8.1) (a) What was the ratio of Tris+ (conjugate acid) / Triso (Conjugate base) at the start of

asked on June 26, 2016
31. ## Math

The Wildcats basketball team scored 18 points in the first half of the game. All the points came from either 2 or 3 point baskets. If a total of 8 shots were made ( some two pointers and some three points), how many of each type of shot were made?

asked on September 3, 2015
32. ## Physics

Two balls undergo inelastic collision. The y-momentum after the collision is 98 kilogram meters/second, and the x-momentum after the collision is 100 kilogram meters/second. What is the magnitude of the resultant momentum after the collision?

asked on June 15, 2012
33. ## phys

A long distance swimmer is able to swim through still water at 4km/hr. She wishes to swim from Port Angeles, WA due north to Victoria, B.C., a distance of 50km. An ocean current flows through the Strait of Juan de !@#\$%^&a from west to east at 3km/hr. In

asked on October 19, 2008
34. ## essay edit

Can someone look over this? I've been working on wordiness, sentence structure, and repetition. Tangled and its Hidden Critique of Rapunzel Peeking at the mere surface of the film Tangled (2010) directed by Nathan Greno and Brian Howard, most would presume

asked on November 2, 2014
35. ## math

there are 12 men on a basketball team, and in a game 5 of them play at any one time. if the game is 1 hr long and if each man plays exactly the same amount of time how many minutes does each man play? a) 10 b) 12 c) 24 d) 25 e) 30 b) 12 NO. Its d) 25. With

asked on June 29, 2005
36. ## 7th grade

What is the definition of the word "hamebells" from the book "The Red Pony" by Steinbeck. I have searched all dictionary sources I could and can't seem to find out anythin on it. Is it, perhaps, a slang word for something else?

asked on September 9, 2009
37. ## math

A cup of brewed tea has 54 milligrams less caffeine than a cup of brewed coffee. If a cup of tea has 66 milligrams of caffeine, how much caffeine is in a cup of coffee?

asked on October 14, 2013
38. ## statistics

Using the 68-95-99.7rule. Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities: a. percentage of scores less than 100 b. relative frequency of

asked on May 10, 2010
39. ## Statistics

A student is taking a multiple-choice exam with 16 questions. Each question has five alternatives. If the student guesses on 12 of the questions, what is the probability she will guess at least 8 correct? Assume all of the alternatives are equally likely

asked on May 14, 2008
40. ## Chemistry

In the chemical reaction where N2O4(g) is converted to 2NO2(g), if 0.5 M N2O4 and 0.15 M NO2 are present in the vessel, is the reaction at equilibrium? If not, which direction would the reaction proceed? (Kc = 4.4 × 10-3) N2O4(g) 2NO2(g) a. No, Q = 4.5

asked on June 13, 2018
41. ## Physics Problem

The portion of string between the bridge and upper end of the fingerboard (the part of the string that is free to vibrate) of a certain musical instrument is 60.0 cm long [.6m] and has a mass of 2.23 g [.00223kg]. The string sounds an A4 note (440 Hz) when

asked on November 19, 2007
42. ## Physics

Planet Jupiter revolves around the Sunin 12 years (3.79 X 10^8 sec. What is its mean distance from center of Sun? mass of sun is 1.99 x 10^30 kg.

asked on June 17, 2012
43. ## equilibrium concentration

A standard solution of FeSCN2+ is prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN. The equilibrium concentration of FeSCN2+ ([FeSCN2+]std) for this standard solution is assumed to be ? M. Wouldn't that be 0.002 x 1/11 = ??

asked on April 4, 2007
44. ## Physics(class) /Math (problem)

Moe earns 15% more than her husband Joe. Together they make 78000 per year. What is Joe’s annual salary? Answer to two significant figures. My answer was \$31000, but the program doesn't seem to want to take it. Did I do something wrong?

asked on October 3, 2012
45. ## physics

A 70.0 kg climber is supported in the "chimney" by the friction forces exerted on his shoes and back. The static coefficients of friction between his shoes and the wall, and between his back and the wall, are 0.760 and 0.610, respectively. What is the

asked on October 26, 2009
46. ## physcial science

Picnickers see a lightning flash and hear the resulting thunder 7.9 s later. If the storm is traveling at a rate of 20. km/h, how long, in minutes, do the picnickers have before the storm arrives at their location?

asked on June 23, 2015
47. ## Chemistry

a dose of asprin of 5.0mg per kilogram of body weight has been perscribed to reduce the fever of an infant weighing 8.0 pounds one pound is 453.59g what is the number of milligrams of asprin that should be administered

asked on September 29, 2010
48. ## High School Math

Write an equation for the sentence below. Then solve the equation. Thirteen multiplied by h is one hundred and four. A. 13h = 104; 91 B. 104h = 13; mc011-1.jpg C. mc011-2.jpg; 1,352 D. 13h = 104; 8 I chose A and it;s not right could it be D

asked on October 3, 2012
49. ## chem 2

what is the mass of F in grams in 24.6 grams of SnF2? Convert 24.6 g SnF2 to mols SnF2. Convert mols SnF2 to mols F atoms. Convert mols F atoms to grams F atoms. 24.6 g SnF2*(1 mol SnF2/molar mass SnF2)*(2 mols F/1 mol SnF2)*(atomic mass F/1 mol F Atoms) =

asked on July 16, 2007
50. ## chemistry

equilibrium pressure at 731 K for the reaction H2+I2-2HI initially the mixture contains 0.08592 each of H2 and I2 and 1.0atm.what is the pressure of HI at equilibrium?

asked on July 10, 2012
51. ## math

If a and b are positive integers and their product is 3 times their sum, what is the value of 1/a + 1/b? Given that ab = 3(a + b). From this, ab/3 = a + b. Dividing through by ab yields 1/a + 1/b = 1/3.

asked on June 30, 2005
52. ## statistics

assume that a set of test scores is normally distributed with a mean of 100 and a standard devaiton of 20. Use the 68-95-99.7 rule to find the following quantities: a. percentage of scores greater than 120

asked on May 16, 2010
53. ## Physics

Skier A of mass 71kg slides down a slope and makes a completely inelastic collision with Skier B, who is stationary, and has a mass of 55kg.Immediately after the collision both skiers have a speed of 5.8m/s. a)Find the speed of skier A immediately before

asked on October 25, 2015
54. ## Chemistry

student perform 2 melting point determinations on a crystalline product. In one determination, the tube contained a sample 1 - 2 mm in height, and the melting point was 141 - 142 ¢ªC. In the second determination, the sample hight was 4 - 5 mm and the

asked on September 1, 2009
55. ## s.s

Did the Constitution resolve the weaknesses in the Articles of Confederation?

asked on December 4, 2008
56. ## Economics

Four roommates are planning to spend the weekend in their dorm room watching old movies, and they are debating how many to watch. Here is their willingness to pay for each film: Orson Alfred Woody Ingmar Frist film 7 5 3 2 Second film 6 4 2 1 Third film 5

asked on September 30, 2006
57. ## Physics

A block weighing 6.8 N requires a force of 2.5 N to push it along at constant velocity. What is the coeﬃcient of friction for the surface? A weight W is now placed on the block and 4.6 N is needed to push them both at constant velocity. What is the

asked on January 8, 2011
58. ## physics

A uniform metre rule of mass 120g is pivoted at 60cm Mark.At what point should a mass of 50g be suspended for it to balance horizontally

asked on March 14, 2020
59. ## Chemistry

Which of the following gases would be most likely to experience ideal behavior at high pressures? a. F2 b. Ne c. C2H6 I think the answer is Ne. But I want to make certain. Thanks

asked on June 13, 2018
60. ## PHYSICS

A ball is dropped onto the floor from a height of 20m. It rebounds to a height of 15m. If the ball was in contact with the floor for 0.01sec what was its average acceleration during the contact take g=10m/s

asked on May 28, 2016
61. ## Chemistry (Help!)

Reaction: 1/2N2 + 3/2H2 --> NH3 Delta H = -46Kj/mol 1) Find delta H n(NH3)formed=5 mol. M(NH3=8.5g) 2) Find delta H a)3 mol H2 + 3 mol N2 b) 3 mol H2 + 0.5 mol N2 M NH3 = 17 g/mol ???

asked on September 24, 2016
62. ## physics

the following point charges are placed on the x-axis: +2.0μC at x=20cm,-3.0μC at x=30cm and -4.0μC at x=40cm. What is the potential at x=0?

asked on November 19, 2015
63. ## Physics

A fisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. It takes 2.90 s for the boat to travel from its highest point to its lowest, a total distance of 0.640 m. The fisherman sees that the wave

asked on November 20, 2007
64. ## PHYSICS

a mass of 3kg rests on smooth horizontal table connected by a light string passion over a smooth pulley at the edge of the table to another mass of 2kg hanging vertically. when the system is released from rest with what acceleration do the masses move and

asked on June 21, 2016
65. ## Chemistry

You have the following acids and their conjugate bases available: Acetic Acid: CH 3COOH/CH3COO-; Ka = 1.8 × 10-5 Carbonic Acid: H2CO3/HCO3-; Ka = 4.2 × 10-7 Hydrofluoric acid: HF/F-; Ka = 7.2 × 10-4 Which of these acid/conjugate base pairs would be the

asked on June 13, 2018
66. ## Finance

Ngata Corp. issued 19-year bonds 2 years ago at a coupon rate of 9.6 percent. The bonds make semiannual payments. If these bonds currently sell for 107 percent of par value, what is the YTM?

asked on December 1, 2016
67. ## math

using two fair dice, what is the probability of rolling a sum that exceeds 4?

asked on March 12, 2012
68. ## Algebra 2 Honors

Find the exact value by using an appropriate sum or difference identity. cos(165) degrees

asked on June 6, 2010
69. ## Chemistry

Write the dissociation equation for iron(II) ammonium sulfate hexahydrate in water . Fe(NH4)2(SO4)2 * 6H2O --> __?________ I know dissociate means to take apart so for example; NaCl would look like Na^+ + Cl^- And another one like: Fe2(SO4)3 would look

asked on October 4, 2015
70. ## Chemistry

Given the following acid dissociation constants, which acid has the strongest conjugate base? a. HCN Ka = 6.2 x 10-10 b. HOCl Ka = 3.0 x 10-8 c. HIO3 Ka = 0.17 I believe the answer is HCN it has the lowest Ka and is the weakest acid.

asked on June 13, 2018
71. ## physics

A descending elevator of mass 670 kg is uniformly decelerated to rest over a distance of6 m by a cable in which the tension is 8683 N.The acceleration due to gravity is 9.8 m/s2.Calculate the speed vi of the elevator at the beginning of the 6 m descent.

asked on October 6, 2010
72. ## oxidation

In the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water, the oxidizing agent is... ? Fe(II) ==> Fe(III) H2O2 ==> H2O. Fe goes from +2 to +3, that is a loss of electrons, so it is oxidized (by definition,

asked on April 19, 2007
73. ## Algebra 2 Honors

Find all solutions if 0 degrees is less than or equal to x and x is less than 360 degrees. 2 sin^2(x)+ sin(x)=1

asked on June 6, 2010
74. ## Chemistry

If K > 1 at 25°C and 1 atm of pressure, then which statement is true about the reaction's equilibrium? a. There is always more reactant than product at equilibrium under all conditions. b. There is more product than reactant at equilibrium at these

asked on June 13, 2018
75. ## physics

shuffleboard disk is accelerated at a constant rate from rest to a speed of 6.0 m/s over a 1.5 m distance by a player using a cue. At this point the disk loses contact with the cue and slows at a constant rate of 3.5 m/s2 until it stops. (a) How much time

asked on September 25, 2012
76. ## chem

I have a few questions. 1. write the net ionic equation for a precipitate when solutions of magnesium nitrate and potassium hydroxide form. When I did this equation out, both products were soluble. Am I doing this wrong? 2. A 50.00 mL sample of .0250 M

asked on October 19, 2006
77. ## government

what is the separation of powers between the legislative and the executive branch regarding the budget.

asked on May 12, 2017
78. ## PHYSICS

A stone is dropped from the top of a cliff and one second latter a second stone is thrown vertically downward with a velocity of 20m/s. How far below the top of the cliff will the stone overtake the first?

asked on May 29, 2016
79. ## maths

the angle of elevation of a top of a tree from point P on horizontal ground is 30 degrees.Fromanother point Q 8 METRES FROM THE BASEof the tree,the angle of elevation of the top of the tree is 48 degrees. a)calculate to one decimal place the height of the

asked on April 21, 2019
80. ## PHYSICS

A 70 kg student traveling in a car with a constant velocity has a kinetic energy of 1.4 104 J. What is the speedometer reading of the car in km/h?

asked on February 20, 2011
81. ## Stats

A car insurance company has determined that 7% of all drivers were involved in a car accident last year. The company randomly selects 200 drivers. Compute the mean and standard devistion of the random variable, x, the number of drivers involved in

asked on November 5, 2010
82. ## Physics

A motorcycle rider plans to make a jump off a ramp. If he leaves the ramp with a speed of 38.0m/s and has a speed of 36.3m/s at the top of his trajectory, determine his max height above the end of the ramp. Ignore friction and air resistance. i got 6.45m

asked on October 25, 2015
83. ## math

a telephone pole is supported by two cables attached to points on the pole 15 ft above ground and to points on the level ground 8 ft from the foot of the pole. what is the total length of the two cables

asked on October 13, 2014
84. ## Chemistry

Using the information below, which answer lists the salts in order of increasing solubility? PbSO4 Ksp = 1.6 x 10^-8 PbS Ksp = 8 x 10^-28 PbI2 Ksp = 7.1 x 10^-9 PbCl2 Ksp = 1.6 x 10^-5 a. PbS < PbI2 < PbSO4 < PbCl2 b. PbI2 < PbCl2 < PbS < PbSO4 c. PbCl2 <

asked on June 13, 2018
85. ## chemistry

A balloon is filled with hydrogen gas. reaction is Fe(s) + H2SO4(aq) ----> FeSO4(aq) + H2(g). The volume of the ballon was 4800 m cubed and the loss of hydrogen gas during filling was estimated at 20.% What mass of iron splints and 98% by mass H2SO4 were

asked on April 6, 2017
86. ## algebra

What is the width of a rectangle with a perimeter of 70 feet if its length is 1 foot? 2 feet? L.feet? perimeter = 2(length + width) If perimeter = 70 then 35= length + width Now substitute 1,2,and L and solve for width. how do you find the L. feet? L is

asked on September 12, 2006
87. ## Science:Biology

What are some unusual characteristics of food webs in agroecosystems?

asked on January 5, 2016
88. ## chem

When an electric discharge is passed through boron trichloride a new compound is formed. what is its simplest formula if on analysis it is shown to contain .0878 g of chlorine and .0131 g of boron?

asked on December 15, 2010
89. ## Chemistry

The percentage composition of chlorine, by mass, in the compound K2PtCl4 is

asked on August 18, 2010
90. ## chemestry

What is the energy of the photon emitted when the electron in a hydrogen atom drops from energy level E5 to energy level E2?

asked on July 12, 2014
91. ## physics

A piano is being moved into a concert hall up a 15m ramp that has a final height of 1.5m. To help with the weight, a rope has been tied between the piano and a counterweight through two pulleys. One at the top of the ramp and the other off the edge of the

asked on December 20, 2012
92. ## Physics

A mass is stretched 4cm from equilibrium position of a spring. If the displacement is doubled, what can be concluded about the restoring force? A. It halved. B. Same C. Increased by 4 D. Decreased by 4

asked on June 17, 2012
93. ## calculus help please

A piece of wire 14 m long is cut into two pieces. One piece is bent into a square and the other is bent into an equilateral triangle. (a) How much wire should be used for the square in order to maximize the total area? = 14 m (b) How much wire should be

asked on April 15, 2014
94. ## Science

What processes must a stone undergo if it is to be made ready for use in jewelry?

asked on October 21, 2007
95. ## CHEMISTRY HELP

Reaction: 1/2N2 + 3/2H2 --> NH3 Delta H = -46Kj/mol 1) Find delta H n(NH3)formed=5 mol. M(NH3=8.5g) 2) Find delta H a)3 mol H2 + 3 mol N2 b) 3 mol H2 + 0.5 mol N2 M NH3 = 17 g/mol ???

asked on September 24, 2016
96. ## Accounting1 - ethical issue

Discount Hardware Wishes to expand its business and has borrowed \$200,000 from the Toronto Dominion Bank. As a condition for making this loan, the bank required discount hardware to maintain a current ratio of atleast 1.50 and a debt ratio of no more than

asked on August 1, 2007
97. ## PHYSICS

A player kicks a ball at an angle of 37degree with the horizontal and with an initial speed of of 48ft/s. A second player standing at a distance of 100ft from the first in the direction of the kick starts running to meet the ball at the instant it is

asked on May 28, 2016
98. ## 4th grade

need help with edhelperku puzzle

asked on November 4, 2009
99. ## Chemistry

Three unknown solutions were prepared by pipetting 15.00 mL of an unknown nickel solution into a 200.00 mL volumetric flask and diluting to the mark. Then three samples were prepared from this dilute unknown solution by pipetting 5.00 mL of the dilute

asked on January 14, 2018
100. ## Math

A) A rectangle has perimeter 64 cm and area 23 cm^2. Solve the following system of equations to find the rectangle's dimensions. length=23/width length + width = 32 B) Solve the system of equations x^2+y^2=1 xy=0.5

asked on June 7, 2009

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