# Questions Asked onDecember 15, 2010

1. ## chemistry HELP!

Solve an equilibrium problem (using an ICE table) to calculate the pH of each solution: a solution that is 0.170 M in HC2H3O2 and 0.105 M in KC2H3O2

asked by Lisa
2. ## Chemistry

a chemist needs to order Na2B4O7. One supplier offers it in an anhydrous (without water) form, while another offers it as a hydrated crystal, Na2B4O7*10H20. if the prices from the two suppliers are the same for a 500.0-g bottle, which one would supply more

asked by Anonymous
3. ## physics

20 kg , 30 cm diameter disk is spinning at 300 rpm. How much friction force must be applied to rim to bring the disk to a halt in 3.0s?

asked by Justin
4. ## chem

Consider the following unbalanced equation: C2H5OH(g) + O2(g) → CO2(g) + H2O(l) 1.55 g of ethanol reacts with 10.0 g of oxygen. What is the total volume of gas present (in L) after the reaction is complete, assuming the reaction takes place at 1.00 atm

asked by Bogdanam
5. ## Chemistry

What is the percent by mass of glucose in a solution containing 0.15 moles of glucose dissolved in 410g acetic acid? The molar mass of glucose is 180g/mol

asked by Lauren smith
6. ## physics

2. A heavy box is pulled across a wooden floor with a rope. The rope forms an angle of 60.0°with the floor. A tension of 80.0° N maintained on the rope. What are the horizontal and vertical components of the force?

asked by Anonymous
7. ## Physics

How long would it take a kettle with a 1kW heating element to heat 1 litre of water? Watts = Joules / second • Mass of 1 litre of water = 1kg • 1 kW = 1 k Joule / second or 1000 joules/ second • 1g of water needs 4.184J to raise the temperature by

asked by Paul
8. ## chemistry

Predict qualitatively whether the salts below dissolve to give solutions that are acidic, basic or neutral. what is the rule for figuring this out? a. KNO2 - basic b. Ng(NO3)2 - neutral c. NH4ClO2 - acidic d. NaHCO3 - basic

asked by Lisa
9. ## English

Seven brothers' families grew to more than one thousand people in 100 years. Does families need an apostrophe? The mens group made t-shirts for the children. would mens be 's or s' ?

asked by jill
10. ## chemistry

calculate the pH of a 1.94M solution of nitrous acid (HNO2 - ka = 4.5E-4).

asked by Tara
11. ## Physics

What would be the weight of a 1.0kg mass on the surface of Mars? The mass of Mars is 0.11 that of the earth, and its radius is 0.53 that of the earth.

asked by Universal Gravitation
12. ## chem

15.0 mL of 0.30 M sodium phosphate solution reacts with 20.0 mL of 0.22 M lead(II) nitrate solution. What is the concentration of phosphate ions left in solution after the reaction is complete? A) 0.0 M B) 0.045 M C) 0.13 M D) 0.060 M E) 0.12 M

asked by Bogdanam
13. ## Chem

Which of the following solutions would require the greatest volume of 1.0M NaOH for complete neturalization? a)10.0ml of 1.0M HCl b) " of 2.0 M H2S04 c) " of 3.0M H3P04 d) " of 4.0M H2C204 I don't understand what to do to solve it.

asked by Chels
14. ## Chemistry

Copper sulfate is a hydrated crystal with the formula CuSO4*5H20 and a deep blue color. when its heated, the crystals crumble and turn white. (a) propose an explanation for this change of color. (b) what would you do to restore the blue color?

asked by Anonymous

Lily went for 8 rides at the county fair. Some rides were on the merry-go-round, and the rest were on the pirate ship. The total cost of all rides was $6.30. Each pirate ship ride cost$0.60, and each merry-go-round cost $0.90. How many pirate ship did asked by Evelyn 16. ## Chemistry The gaseous product of a reaction is collected in a 25.0-L container at 27 C. The pressure in the container is 216 kPa, and the gas has a mass of 96.0 g. What is the molar mass of the gas? asked by Ashleigh 17. ## physics A friend throws a baseball horizontally. He releases it at a height of 2.0 m and it lands 21 m from his front foot, which is directly below the point at which he released the baseball. (a) How long was it in the air? (b) How fast did he throw it? asked by molly schwalje 18. ## physics A box is dropped from a spacecraft moving horizontally at 27.0 m/s at a distance of 155 m above the surface of a moon. The rate of freefall acceleration on this airless moon is 2.79 m/s2. (a) How long does it take for the box to reach the moon's surface? asked by kevin giordano 19. ## chem The heat of combustion of bituminous coal is 2.50 × 104 J/g. What quantity of the coal is required to produce the energy to convert 137.7 pounds of ice at 0.00°C to steam at 100.°C? specific heat (ice) = 2.10 J/g°C specific heat (water) = 4.18 J/g°C asked by Bogdanam 20. ## Chemistry (URGENT) A gas mixture with a total pressure of 770 contains each of the following gases at the indicated partial pressures: CO2 , 249mmHg ; , Ar 114mmHg ; and , O2 174mmHg . The mixture also contains helium gas. 1. What is the partial pressure of the helium gas? asked by Ashley 21. ## Math Cliff has some money he wants to invest for his retirement. He is offered two options: 1. 10%/a simple interest 2. 5%/a compounded annually Under what conditions should he choose the first option? asked by Emily 22. ## Chemistry For the reaction: 2H+(aq) + CO3-2(aq) --> CO2(g) + H2O(l) A. Calculate the deltaHºrxn for the reaction. Given deltaHºf for CO3-2(aq) = -677.1 kJ/mol. B. Using the above reaction, what would be the final temperature of a coffee cup calorimeter when 0.104 asked by Millie 23. ## chemistry Some hydrogen and iodine are mixed up at 229 degrees celsiusin a 1-L container. When equilibrium is established, the following concentrations are present: [HI]= 0.490M, [H2]=0.080M, and [I2]= 0.060M. If an additional 0.300 mol of HI is then added, what asked by jlh 24. ## Physics A merry-go-round is rotating at 4.775 revs/min with a 45 kg child on the outer edge. The radius is 2.0 m. The child moves to the centre of the merry go round. What is the final angular velocity of the merry go round. The moment of inertia of the asked by Jon 25. ## physics Derek the drunk driver drives his car off the road, onto a gravel strip next to the road. Derek does not have anti-lock brakes, so his wheels lock when he enters the gravel area, and the car slides to a halt. Derek's car is traveling at a speed of 20m/s asked by aok 26. ## geometry Write the converse, inverse, and contrapositive of the conditional statement. If an animal is a bird, then it has two eyes. asked by Kaylaa 27. ## physics Two boxes are seen to accelerate at the same rate when a force F is applied to the first and 5 F is applied the second. What is the mass ratio of the first box to the second? asked by jane 28. ## Math Cliff has some money he wants to invest for his retirement. He is offered two options: 1. 10%/a simple interest 2. 5%/a compounded annually asked by Emily 29. ## chemistry what is the total number of joules released when a 5.00 gram sample of water changes from liquid to gas at 100 degrees Celsius? asked by Help 30. ## Physics A ferris wheel, radius 5.0m, rotates once every 8.4 seconds. a) What is the centripetal acceleration of a 60kg person at the circumference? b) calculate the force of the seat on the person at the highest point. c) calculate the force of the seat on the asked by Jon 31. ## 11th grade Is this sentence punctuated correctly. My garden is full of water, because of yesterday's rain asked by Anonymous 32. ## chemistry How many moles of water, H2O, are present in 75.0 g H2O? asked by t 33. ## algebra A boat's crew rowed 13.5 miles downstream, with the current, in 1.5 hours. The return trip upstream against the current covered the same distance, but took 4.5 hours. Find the crew's rowing rate in still water and the rate of the current. asked by tiara 34. ## Physics A 1000kg space craft at 500m/s is on a collision course with a 400kg satellite travelling at 700m/s. Their paths are converging at a 45 degree angle. After the collision, they remain locked together. a) calculate their final speed b) calculate the quantity asked by Jon 35. ## math There are a total of 107 foreign language students in a high school where they offer only Spanish, French, and German. 42 take Spanish. 46 take French. 45 take German. 8 take Spanish and French but not German. 8 take Spanish and German but no French. 6 asked by Christy 36. ## 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 by christine 37. ## Math Suppose you are managing 25 employees, and you need to form three teams to work on three different projects. Assume that all employees will work on exactly one team. Also, each employee has the same qualifications/skills, so any employee can serve on any asked by David 38. ## Statistics In a survey of 1037 adults from the United States age 65 and over, 643 were concerned about getting the flu. Construct a 90% confidence interval for the population proportion. asked by Christina 39. ## Algebra 2 A man is planning to invest up to$22,000in bank X or bank Y or both. He wants to invest at least $2,000 but no more than$14,000 in bank X. Bank Y doesn't insure more than a $15,000 investment so he will not invest no more than that in bank Y. The intrest asked by Kelsie 40. ## math dara spent 25% of his money in one shop , he spent 33 1/3 of the remainder and had £6.80 left , how much had he at first asked by Graham 41. ## CHEMISTRY TITRATION Q The titration of 25.00mL of Ba(OH)2 solution with an aqueous solution of 0.500 M HCl reaches an end point when 30.20 mL of the HCl solution is added. Determine the concentration of M of the Ba(OH)2 solution. Soo 25.00mL=0.025L 30.20mL= 0.0302L moles= MxL asked by LISA 42. ## physics A cannon mounted on a pirate ship fires a cannonball at 125 m/s horizontally, at a height of 17.5 m above the ocean surface. Ignore air resistance. (a) How much time elapses until it splashes into the water? (b) How far from the ship does it land? asked by katerina C. 43. ## physics A box is dropped from a spacecraft moving horizontally at 27.0 m/s at a distance of 155 m above the surface of a moon. The rate of freefall acceleration on this airless moon is 2.79 m/s2. (a) How long does it take for the box to reach the moon's surface? asked by misha shrutt 44. ## 10th grade Describe the geography of Southern South America and how this geography influences economic activity? asked by kaitlyn 45. ## physics A car moving at 20m/s is sounding its horn as it approaches you. If the actual frequency of the horn is 283 Hz, what frequency will you hear at 25.0 degrees C? asked by Hannah 46. ## geology Apart from the composition of the rock itself, what climate do you imagine is more conducive to physical weathering? and Chemical weathering? I know physical weathering is from wind and water transporting the eroded rocks and particles. Chemical weathering asked by m 47. ## college Translate to an equation: r$2 roses and t $2.50 tulips total$30 graph the equation and use the graph to determie three different combinations of roses and tulips that total $30. asked by Kristie 48. ## math Find the area bounded by the parabola y^2=4x and the line y=2x-4. Use vertical representative rectangles (integrate with respect to x) and horizontal representative rectangles (integrate with respect to y). the answer is 9 square units ... i just need to asked by ashton 49. ## chemistry A researcher put 10.0 moles of N2O into a 2-L container at some temperature where it decomposes according to the following: N2O = 2N2+ O2. At equilibrium 2.20 moles of N2O remain. Calculate the Kc for the reaction. asked by Jessica 50. ## PHYSICS Two railroad cars, each of mass 7600KG and traveling 85KM/H in opposite directions, collide head-on and come to rest. How much thermal energy is produced in this collision? asked by HELP ASAP 51. ## Physics A 1000kg space craft at 500m/s is on a collision course with a 400kg satellite travelling at 700m/s. Their paths are converging at a 45 degree angle. After the collision, they remain locked together. a) calculate their final speed b) calculate the quantity asked by Jon 52. ## College Calc 1 Find the area bounded by the parabola y^2=4x and the line y=2x-4. Use vertical representative rectangles (integrate with respect to x) and horizontal representative rectangles (integrate with respect to y). the answer is 9 square units ... i just need to asked by Ashton 53. ## Chem What is the equilibrium constant expression for the predominant equilibrium in HPO4^2- (aq)? asked by Liz 54. ## chemistry A researcher put 10.0 moles of N2O into a 2-L container at some temperature where it decomposes according to the following: N2O = 2N2+ O2. At equilibrium 2.20 moles of N2O remain. Calculate the Kc for the reaction. asked by Jessica 55. ## science 2H2(g) + O2(g) = 2H2O (l) Calculate the volume of Hydrogen gas at STP required to produce an amount of energy equivalent to that produced by the combustion of a gallon of octane. The density of octane is 2.66 kg/gal, and its standard enthalpy of formation asked by alex 56. ## physics A 52 kg skier is at the top of a slope, as in the figure. At the initial point A, the skier is 17.7 m vertically above the final point B. The acceleration of gravity is 9.81 m/s2 . Find the difference in gravitational po- tential energy associated with the asked by carlos 57. ## Chem which of the following occurs when a sample of 0.1M HNO3 is tested? a) phenolphthalein turns pink b) bromthymol blue turns yellow c) Ca9s) reacts and produces CO2 (g) d) Na (s) reacts and rpoduces NO2 (g) asked by Liz 58. ## Help pls A box is dropped from a spacecraft moving horizontally at 27.0 m/s at a distance of 155 m above the surface of a moon. The rate of freefall acceleration on this airless moon is 2.79 m/s2. (a) How long does it take for the box to reach the moon's surface? asked by misha shrutt 59. ## government Describe two ways the federal bureaucracy helps to shape laws passed by Congress. asked by Anonymous 60. ## Language arts 7th grade how would you write a 2:2 Jane Schaeffer paragraph? asked by Sidney 61. ## 11th grade mr.reyes's geometry class built kites.of the 32 students in class, 87.5% of the kites flew.of the remaining kites, 75% of kites were unfinished.how many kites were finished but did not fly? asked by Anonymous 62. ## infinitives You have two choices, to stay or to go. to stay and to go are the infinitives they are used as adjectives? asked by michael 63. ## physics if you exert a force of 500 N to walk 4 m up a flight of stairs in 4 s, how much asked by tom 64. ## math My study group is lost on this one also.. Suppose you are managing 25 employees, and you need to form three teams to work on three different projects. Assume that all employees will work on exactly one team. Also, each employee has the same asked by Friends 65. ## physics A 1.5 kg otter starts from rest at the top of a muddy incline 87.1 cm long and slides down to the bottom in 0.60 s. What net external force acts on the otter along the incline? asked by jane 66. ## Science Where on a rollercoaster is potential energy the greatest? The least? Please help me, this is due tomorrow. I have a bunch of other questions along with this. I am such a procrasinator. >.< Thank you! -Pancake asked by The Official Pancake Queen 67. ## hypothesis statistic how a t Test can be employed in hypothesis testing by the use of directional vs. nondirectional hypotheses. Discuss types of research where using the t statistic may be an appropriate alternative to using a z-score. Respond to at least two of your fellow asked by smith 68. ## calculus The base of a certain solid is the triangle with vertices at (-10,5), (5,5), and the origin. Cross-sections perpendicular to the y-axis are squares. What is the volume of the solid? asked by Anonymous 69. ## physics A 1300 sports car accelerates from rest to 95KM/H in 7.0S .What is the average power delivered by the engine? asked by HELP 70. ## physics A 52 kg skier is at the top of a slope, as in the figure. At the initial point A, the skier is 17.7 m vertically above the final point B. The acceleration of gravity is 9.81 m/s2 . Find the difference in gravitational po- tential energy associated with the asked by carlos 71. ## World history During early civilizations why did most cities rise in river valleys? a.River valleys provided work to men who built dikes and canals b.People built cities on riverbanks for easy access to travel and trade c.city-state goverment centers were located in asked by alley 72. ## physics school question? A long jumper travels 8.95 meters during a jump. He moves at 10.8 m/s when starts his leap. At what angle from the horizontal must he have been moving when he started his jump? You may need the double-angle formula: 2 sin u cos u = sin asked by kevin giordano 73. ## Chemistry Determine how many milliliters of 0.448 M HClO4 will be required to neutralize 38.30 g Ca(OH)2 according to the reaction: 2HCl+Ca(ClO4)2+2H20 asked by Anonymous 74. ## physics A long jumper travels 8.95 meters during a jump. He moves at 10.8 m/s when starts his leap. At what angle from the horizontal must he have been moving when he started his jump? You may need the double-angle formula: 2 sin u cos u = sin (2u) asked by sue 75. ## science what properties of carbon explain its ability to form many macromolecules? asked by hannah 76. ## infinitives Last Friday, Sam went to high school to sign up for a class. to high school infinitive to sign up infin. Are they both adverb phrases answering where and why? asked by michael 77. ## Aims math [help please very appreciated] Solve fro x. 15x+4=21+2x asked by Amy 78. ## chemistry 110 Calculate the empirical formula of a compound containing 52.14% C, 13.12% H, and 34.73% O. I don't understand how they got the answer. please help asked by kim k 79. ## chemistry a buffer is made by mixing 0.1 moles of acetic acd a sodium acetate in 500 ml of solution. determine the pH of the buffer. (Ka for acetic acid - 1.8E-5) asked by Tara 80. ## 6th grade why Martin Luther King and Rosa Parks visit to Paterson NJ was important and why they need to be memorialized and celebrate to promote their memory and legacy. I have no idea what to write please asked by ym 81. ## AP Calculus True or False If f'(c)=0=f''(c)is less than 0, the f(c) is a local maximum. Justify your answer. asked by Smith 82. ## science what property of the materials used in computer chips makes them useful as switches that trun electricty on and off asked by yuku 83. ## science what type of readioactive decay results in uranium-238 becoming thorium-234? asked by yuku 84. ## calculus The base of a certain solid is the triangle with vertices at (-10,5), (5,5), and the origin. Cross-sections perpendicular to the y-axis are squares. What is the volume of the solid? asked by Anonymous 85. ## Chemistry Green Light has a frequency of about 6.00 * 10^14 s^-1. What is the energy of the green light? asked by Ashley 86. ## Chemistry Can the 5% approximation be used to determine the pH of the following solutions? How do I do this question? (A) 0.56 M hypochlorous acid - yes (B) 3.00 M nitrous acid - yes (C) 0.010 formic acid - no asked by LISA 87. ## 12th grade one type of probability used everyday is: a)experienced probability b)scientific probability c)frequency of occurence d)none of the above asked by david 88. ## physics A 52 kg skier is at the top of a slope, as in the figure. At the initial point A, the skier is 17.7 m vertically above the final point B. The acceleration of gravity is 9.81 m/s2 . Find the difference in gravitational po- tential energy associated with the asked by carlos 89. ## physics A 52 kg skier is at the top of a slope, as in the figure. At the initial point A, the skier is 17.7 m vertically above the final point B. The acceleration of gravity is 9.81 m/s2 . Find the difference in gravitational po- tential energy associated with the asked by carlos 90. ## Global Business 1250 words Prepare a financial overview for your global venture (Sugar / Mexico). Include a chart that represents the general budget for your global venture. Explain how your company deals with foreign exchange risk for your global operation. Identify asked by lila 91. ## 7th grade how do you find the range of a math problem if you have all even numbers? asked by jenny 92. ## math two runners jog around an oval path at constant rates, but in opposite directions. One runner completes a lap every 10 minutes, and the other does a lap every 12 minutes. How many minutes elapse between consecutive meetings of the runners?Express your asked by Shane 93. ## Chemistry A 16.48 g sample of potassium permanganate is dissolved in a 250.0 mL volumetric flask. A 125.1 mL sample of the potassium permanganate solution is added to 75.3 mL of 5.110 M hydrobromic acid in which 32.3 mL of ethanol has been dissolved (d = 0.7891 asked by Millie 94. ## 12th grade can anyone explain how to divide in algebra? I have this problem: (15x2-24+9)/(3x-3) I am not looking for someone to give me the answer straight out I just need to know how to get there. asked by trina 95. ## physics a girl lifts a 100 N load a height of 2.0 m in a time of 0.5 s. what power does the girl produce? asked by Anonymous 96. ## chem Determine whether Cd^2+ can be separated from Zn^2+ by bubbling H2S through a 0.3 M HCl solution that contains 0.005M Cd^2+ and 0.005 M Zn ^2+. Ksp for CdS is 8*10^-7. Ksp for ZnS is 3*10^-2 asked by coleman 97. ## Creative Writing I need helps with finding the mood for this: Your school needs more money for basic supplies. I kind of have to "beef" that sentence up to show the mood better, but I don't know how to do that. HELP?!?! asked by Gabbi 98. ## social studies In 1973, Congress enacted the endagered species Act (ESA) to protect plants and animals from extinction. Many methods are used for protection. Residential or commercial developments may be banned in an area that is set aside to protect animal or plant asked by esmeralda 99. ## math A woman throws a cricket ball upwards into the air. The ball leaves the womans hand at 1.8m above the ground at speed of 9.7. It rises and then falls back to the ground. Considering the energies involved calculate the speed at the point it hits the ground. asked by joleen 100. ## geometry Given Isosceles trapezoid ABCD. AB = 3x - 4 and CD = x + 12. Find AB. Isosceles trapezoid A B C D is drawn. 2 8 16 20 asked by cc 101. ## calculus what is the equation of the tangent line to the curve x^3 + 2y^2 + 3xy = 6 at the point (1,1)? asked by Sasha 102. ## English 1. You have to wait longer to meet him. 2. You have to stay longer to meet. 3. We can not meet yet. 4. We have to wait longer to meet. 5. It will take longer to meet. (Are they all grammatical? Are they similar in meanings?) asked by rfvv 103. ## math fractions how do you put 7/16, 5/8, and 3/4 in order from greatest to least asked by lexi 104. ## American History Hello I just got done with a homework assignment in American History and there is this one question that has been bugging me: Which of the following is true of the columbus legend? a. He was the only voyager who believed the Earth was round. b. He was the asked by Anthony 105. ## math im a 5th grader and im wondering what3121 is divided by 81 and what is 8921 divided by 59 asked by gia 106. ## psy325 For each of the following samples that were given an experimental treatment, test whether these samples represent populations that are different from the general population: (a) a sample of 10 with a mean of 44, (b) a sample of 1 with a mean of 48. The asked by smith 107. ## Chemistry I need a creative title for a lab report that deals with using dalton's partial pressure law in order to determine the amount of hydrogen gas that was collected over water. any ideas? asked by Jacob 108. ## Writing What can I write about? (holidays, History people,etc.) asked by Erin 109. ## analysis of variance which analysis of variance should be applied when an experiment has more than one independent variable. Discuss the assumptions and limitations of the analysis of variance in comparison with the t test including a discussion of post hoc tests asked by smith 110. ## chi-square test the assumptions for using a chi-square test. Research articles provide practical examples from the research to support your assumptions. Include a citation of one article you used for your research asked by smith 111. ## math Losing your bags during airline travel is not all that uncommon. Recently, an airline was cited for losing customers' baggage 8% of the time. A test is conducted by randomly selecting 20 customers for that airline and observing whether they had lost their asked by Ted 112. ## COM/155 Review pp. 517–520. Describe your experience with credit and credit cards in a brief paragraph using at least five adverbs and five adjectives in your description. Bold the adverbs and underline the adjectives Just wanted to know if this is correct or do asked by BRANDY 113. ## Chem A sample containing 1.2x10^-2 mol HCl is completely neutralized by 100.0mL of Sr(OH)2 what is the [Sr(OH)2]? asked by Anonymous 114. ## physics A 4.5 kg can of paint is sitting on top of a 0.8 meter high step ladder. How much work did you do to move the can of paint to the top of the ladder? asked by Josue 115. ## 7th grade What are the two vegetation types of Ethiopian Highlands? asked by Autumn 116. ## Life Sciene How would the cell theory be affected if scientists could make living cells from carbon, oxygen, and other elements found on earth. asked by Alyssa 117. ## math If O is 31 degrees and T is 121 degrees then what is the measure of angle A? asked by ronnie 118. ## Shurley English I am having a difficult time classifying this sentence: Did Clint's son change the damaged tire on their car? Please help! Thanks! asked by Caroline 119. ## other A cannon mounted on a pirate ship fires a cannonball at 125 m/s horizontally, at a height of 17.5 m above the ocean surface. Ignore air resistance. (a) How much time elapses until it splashes into the water? (b) How far from the ship does it land? asked by katerina C. 120. ## Science(Help NOW, Pls) how is solar energy used in space and for what purpose? asked by GirlSense 121. ## Science(Help NOW, Pls) wat elements make up water? pls help! i will be very happy if you do! :S asked by GirlSense 122. ## 3rd grade How do you classify this sentence? (Shurley English) Did Clint's son change the damaged tire on their car? asked by Caroline 123. ## math Six people are going to be seted in a row of 8 chairs. How many different ways may they be seated? asked by Tom 124. ## English another word for the word derived. pls help. thank you. :) asked by GirlSense 125. ## PSY 202 why is it important to considereach domain in the study of adult development? asked by Randy 126. ## Calculus What's the practical domain and range of this volume function: 4x^3-39x^2+93.5x asked by Allie 127. ## Science What are the bitoic and abiotic factors in a desert ecosystem? How do each of these interact with/affect each other? (be specific and detailed!) Please help me, I will be eternally greatful, haha. :) asked by The Official Pancake Queen 128. ## physics A projectile fired vertically up from a cannon rises 200 m before returning to the ground. If the same cannon were to fire the same projectile at an angle 45 degrees, then the maximum range would be m. asked by mc 129. ## algebra the solutions to the system of equations y= 2x and y =-x + 3 is a)2,1 b)(-1,2) c)2,-1) d)(1,2) asked by david 130. ## science Why is the acceleration the same between a tennis ball and a cannon ball? asked by Addison 131. ## physics The rings of a Saturn-like planet are composed of chunks of ice that orbit the planet. The inner radius of the rings is 78,000 km, while the outer radius is 190,000 km.The mass of this planet is 6.14 * 10^26 kg. asked by physss 132. ## Finance what is the major limitation of the current ratio as a measure of a firm's liquidity? How may this limitation be overcome? asked by Sandy 133. ## Finance What problems may be indicated by an average collection period that is substantially above or below the industry average? asked by Sandy 134. ## trigonometry solve: 2cosx-1=0 asked by ash 135. ## geometry Triangle ABC is an isosceles triangle, where angle B is the vertex angle. If BC = 10x-4 , AC= 2x+18 , and AB= 6x+32, find the value of x. asked by tim 136. ## Math A fence is built around 3 sides of a square piece of land. If the fence is 360ft long, what is the area of the land in square yards? asked by Anonymous 137. ## math -z-(z-6)=8 solve the equation asked by Daniel 138. ## 3rd grade Shurley English Please help classify each word in the following sentence: Put some cheese slices and bread on your plate. Thanks! asked by Caroline 139. ## Algebra 2 Rewrite the expression in simplest form. (-6x^2) (9x^3) Please help me with this ? Do we multiply ??? asked by Anonymous 140. ## chemistry fill in the missing symnbols in the following nuclear bombardment reactions a. 96 4 100 42Mo + 2He = 43 Tc+ ? b. 59 1 56 27Co+ 0n = 25+ ? c. 23 23 1 11Na+ ? = 12Mg+ 0n d. 209 210 1 83Bi+ ? = 84Po+ 0n e. 238 16 1 92U + 8O= ? + 5 0n TEACHER DID NOT EXPLAIN asked by coleman 141. ## algebra the solution to the system of equations y= 2x and y = -x + 3 is a)2,1 b)(-1,2) c)2,-1) d)(1,2) asked by david 142. ## geometry If m asked by sharlene 143. ## Human Service I have tried google, bing, search engines and this is a class question. I need to know the oldest faith based human services and what country they are located. Please some guidence thank you in advance asked by Mary 144. ## 5th math ms. sue please!explain to me one again i'm not getting it yet. 1/4+1/8= ? step by step please!! thank you.. asked by pat 145. ## math Solve 9-2(3x+1)>37 asked by Landon 146. ## college maths One and one-half cups of native blueberries have 232 calories. How many calories does one cup of native blueberries have? (Points: 5) 233.5 calories per cup 232 calories per cup 154.7 calories per cup 0.006 Calories per cup Not sre how to calclate this one asked by lisa 147. ## college algebra Compute x +y, given the linear system with T # 1 and with the ordered pair (x,y) as solution x + 2y=3 Tx + ( T+1)y = T + 2 asked by Mark 148. ## Language arts Figurative language asked by Bob 149. ## chemistry I am doing a boiling point problem and don't know the value of i for the equation delta T = i(kb)(m) solution contains 45.0g caffeine in 25.0 g benzene. asked by Tara 150. ## chemistry what volume of 0.250 M calcium chloride needs to be added to sodium phosphate to produce 35.0 g of calcium phosphate ? asked by jenna 151. ## Chemistry (URGENT) Calculate the molarity of the Co^2+ ion in each of the solutions 1-5. The new molarity is given by the molarity of the stock solution multiplied by the dilution factor. Solution: Co(NO3)2 Original molarity: 0.160 Dilution #1: none D#2: 12mL to 16mL D#3: asked by John 152. ## math A box contains two black balls and three gold balls. Two balls are randomly drawn in succession from the box. a. If there is no replacement, what is the probability that both balls are black? b. If there is replacement before the second draw, what is the asked by Jenni 153. ## chemistry the molar solubility of PbS, in a 0.150 M ammonium sulfide (NH4)2S solution is? The Ksp for PbS= 3.2E-28. asked by Tara 154. ## English 1. Keep your fingers crossed. (Why do you use this expression? When we wish somebody good luck, we keep our fingers crossed. Why do we do that? Do you have some reason for that?) asked by rfvv 155. ## english around how many percent of people think they don't need college degree to find a job asked by 000 156. ## math if there were 28 students 2 teachers and 12 invited guests and each pizza can only be divided in ten pieces.how many pizzas will they need to buy to get each person to get three pieces of pizza? asked by jacquelin 157. ## statistic how a t Test for a dependent variable can be of great value in applying a new approach to the treatment of aggressive behavior to a small group of students. Why would this t Test be preferred to using another test statistic? asked by smith 158. ## math How many possible coalitions are there for 24 shareholders? asked by Gloria 159. ## physics ehich of the following is an example of projectile motion? asked by cecilia 160. ## Chemistry!! Determine the pH of 0.100 M aqueous HCN to two decimal places, and determine the concentration of CN- at equlibrium to two singificant figures. Can you show me all the steps to this question? Please and thank you! asked by Jenni 161. ## english I need help really quick unscrambling this word!!! AAAATTTLIIRRONNME Its two words and its the name of a mall. the first words starts with I and the second starts with M. asked by nick 162. ## physics A 52 kg skier is at the top of a slope, as in the figure. At the initial point A, the skier is 17.7 m vertically above the final point B. The acceleration of gravity is 9.81 m/s2 . Find the difference in gravitational po- tential energy associated with the asked by carlos 163. ## 5th Explorig adding Fraction. 3/4+1/8=? 1/4+ 1/8= 7/8+3/4= please show me how to do this problem.. thanks! next find the sum of 2/5and5/10.____. asked by pat 164. ## PSY 202 Identify the benefits of life experiences for the adult student? Help!! asked by Angela 165. ## Science(Help NOW, Pls) organisms in which domain live in every environment? pls help, im stuck on this one. :S asked by GirlSense 166. ## Business Math Nic has a revolving dept store credit card account with rate 15%annually. Lastmonth balance on the account was$423.78. During the current month, he made purchases totalling $123.42 and made a payment of$100.00. The store uses the unpaid balance method.

asked by Marcy
167. ## physics

How much paraffin oil would be needed to heat the same volume of water? • Heat capacity of water = 4200 j kg-1 K-1 • Mass of 1 litre of water = 1kg • Heat value of paraffin = 45M J kg-1 • Density of paraffin = 800kg m -3 • 1 cubic centimetre

asked by Paul
168. ## math

Write the product 35/14 x 3/125 in scientific notation.

asked by anonymous
169. ## Chemistry

A 10.0 mL sample of 12.1 M hydrochloric acid is added to 90.0 mL of distilled water and added to a sealed 1.04 L reaction vessel containing 1.463 g of calcium hydrogencarbonate at 22.1ºC and 743 mmHg. What is the pressure of carbon dioxide gas?

asked by Millie
170. ## chemistry!

determine the pH of the following mixture. 50.0 mL of 0.0260 M Benzoic acid and 0.626 g of sodium benzoate (assume the final volume is 50.0 mL) please explain the steps

asked by Lori
171. ## physics

A projectile fired vertically up from a cannon rises 200 m before returning to the ground. If the same cannon were to fire the same projectile at an angle 45 degrees, then the maximum rangerange would be m.

asked by mc
172. ## Simplify alegebra 2

-5ã2(4ã2 - 3ã3)

asked by Gabrielle
173. ## math

Juan says, " when you put togetherunequal groups, you can only add. " is he correct

asked by ty
174. ## algebra

how would you solve the following by substitution? {4y-5x=9 {x-4y=11 PLZ HELP!!! THNX!

asked by Crystal
175. ## English

What are some main points of rising action in the Scarlet Ibis?

asked by Maya
176. ## fiance

How to Establish, Use, and Protect Your Credit located under your Week Four Electronic Reserve Readings. List one way to establish your credit and one way to protect your credit.

asked by shay
177. ## algebra 1

Find-x when x=- 7/51

asked by esther
178. ## math

-3.5- 4f=10-2.5f solve the equation

asked by Daniel
179. ## organic chemistry

What is the {\rm HCl} concentration if 54.2 mL of 0.100 M {\rm NaOH} is required to titrate a 30.0 mL sample of the acid?

asked by casey
180. ## Science(Help NOW, Pls)

when rock layers are pulled from opposite directions, one block tilts up, while the other block does what? answer pls, need help.

asked by GirlSense
181. ## science

How many molecules of stearic acid are present in 2.00 mL of a 0.25 mM solution of stearic acid?

asked by sammy
182. ## science

i am trying to figure out how to describe control and variables for an experiment that stores the energy from light and converts it into motion

asked by nicolle
183. ## math

Solve 9-2(3x+1)>37

asked by Landon
184. ## Math

-x^2+4x=-43 I forgot how to do this? Any help would be appreciated.

asked by Kayla
185. ## AP Calculus

A particle is moving around the unit circle (the circle of radius 1 centered at the origin). At the point (.6, .8) the particle has horizontal velocity dx/dt=3. what is its vertical velocity dy/dt at that point? a)-3.875 b0-3.75 c)-2.25 d03.75 e)3.875

asked by Jeff
186. ## BK

If the incline is 25 degrees and a box that is resting on the frictionless incline 50 kg, what is the box acceleration

asked by Lili
187. ## chemistry

for a given reaction, the activation ener

asked by Tara
188. ## grammar

How does one diagram " He helps build the house" "helps" is not a helping verb, but "build" is not an infinitive, or is it?

asked by johni
189. ## math

im a fourth grader asking if 13 feet, 6inches is greater than or less than 5 yards. please tell me the correct answer

asked by faith
190. ## English

It rains cats and dogs. It rains very hard. It rains very heavily. (Are they all the same? Why do we use 'cats and dogs'? Would you let me know the origin of the expression?)

asked by rfvv
191. ## English

1. The music ________ me sad. had, let, saw, helped, made (Which words can be put in the blank? Is it only 'made'? We can not use the other past tense verbs in the blank in the sentence?)

asked by rfvv
192. ## psy325

For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3

asked by smith
193. ## Science

How is solar energy used in space? (for what purpose?)

asked by The Official Pancake Queen
194. ## Chemistry

The four quantum numbers for the last electron placed in the orbitals of a certain element are: n=3 l=2 m of l=0 and m of s=-1/2. What is the element?

asked by Brittany
195. ## math

what are all the factors of 30?

asked by jacquelin
196. ## 9th grade

what is the point called where the lithosphere, hydrosphere and atmosphere overlap?

asked by tinkerbell
197. ## math

what is the greatest common factor of 6 and 12?

asked by jacquelin
198. ## Science

Which of earth's layers contains the most mass?

asked by The Official Pancake Queen

find the amount of money in a bank account given the following conditions. Initial deposit= $2000, annua rate= 5.5%, time= 4 years? asked by Lindsey 200. ## Math I have two unknown numbers x and y, and the sum of x and y(x+y) is 78 and the product is (x*y) is 896 asked by Alexander 201. ## Math Event Probability .37 .18 .13 .32 Dollar Payoff -2 0 6 3 1)Calculate the expected value to two decimal places 2) If the pay off is negative 2 do we win or lose$2?

asked by Christy
202. ## Christmas

Where can I find accurate information on Christmas?

asked by Erin
203. ## Science(URGENT)

How is solar energy used in space? (for what purpose?)

asked by The Official Pancake Queen
204. ## Math

9 1/8 - 2 5/8 can you explain to me how 9 becomes 8 something?

asked by Alyson
205. ## marketing mix

a firm's marketing mix decision areas would not include: A. Product B. Promotion C. Price D. People

asked by Anonymous
206. ## vocab

lead:fllow:_________:interest graceful:clumsy:enlivening;___________ happy:glad:confident:____________

asked by Brakenette
207. ## algbra 2

Rewrite the expression in equivalent simpler form square root 8/9

asked by Anonymous
208. ## calculus

Find the volume of the solid obtained by rotating the region bounded by the given curves about the line x=-3 y=x^2, x=y^2

asked by Anonymous
209. ## Music

dose anyone know who influenced black sabbath?

asked by Courtney
210. ## Chemistry!

Determine the pH of the following, giving your answers to two decimal places. I don't know how to do these problems =( a. 0.100 M ammonia b. 0.11 M oxalic acid. Assume that dissociation resulting from Ka2 is negligible relative to that from Ka1

asked by Jenni
211. ## math

What is the average of two real numbers is 17.5 and their product is 250

asked by Anonymous
212. ## Chemistry

Calculate the pH of a solution at the endpoint of a titration involving 25.00 mL of CH3COOH at unknown concentration, and 21.40 mL of 0.100 M NaOH

asked by Lisa
213. ## geometry

In rectangle ABCD line EF joins the midpoint of line AB and BC. Line BE equals 5, line BF equals 12, find line EF, line AC and perimeter of the rectangle.

asked by Amie
214. ## physics

A 52 kg skier is at the top of a slope, as in the figure. At the initial point A, the skier is 17.7 m vertically above the final point B. The acceleration of gravity is 9.81 m/s2 . Find the difference in gravitational po- tential energy associated with the

asked by carlos
215. ## ALgebra

x/3x^2 - x-3/3x^2+x-10

asked by Anonymous
216. ## Music

Did will smith write his own music?

asked by Sue
217. ## social studies

what is considered alexander the great most lasting achievment?

asked by alley
218. ## English

Thank you very much for your corrections. Here are some more sentences I'm not sure of. 1) Shopping list: how do you call ten one-litre bottles of sparkling water? a half-a-litre bottle of wine 2) I usually spread nut-cream on a slice of bread for (?)

asked by Franco
219. ## physics

An electron starts at rest. Gravity accelerates the electron in the negative y direction at 9.80 m/s2 while an electric field accelerates it in the positive x direction at 3.80×106 m/s2. Find its velocity 2.45 s after it starts to move.

asked by sue
220. ## math

forty-nine days is how many weeks? what are the factors of 12? forty books were put into eight equal stacks how many books were in each stck? how many years are in five centuries? what is the seventh mutiple of 6 then subtract 12 what is the differcecne?

asked by jojo
221. ## geometry

Write and solve an inequality to find the calues of x for which the area of the rectangle is greater than the are of the triangle

asked by Bob
222. ## algebra

Factor x2 - 100

asked by julia
223. ## maths

how do i make d the subject? L=4pisignCd^

asked by joleen
224. ## History Help Please!!!

Can you tie in a leaked U.S. document that referred to particular countries called the "Axis of Mischief" according to the Bolivarian Alternative for the Nations of Our America?

asked by Sam
225. ## Calculus

Find the volume of the solid obtained by rotating the region bounded by the curves about the line x=-3, y=x^2, x=y^2. I keep getting the wrong answer!! Please hellpp!! =(

asked by Anonymous
226. ## science

in the digstive system,what is the defenition or function of th Appendix?

asked by sofia
227. ## science

what is the reason why we can get Appendicittis even if we don't know what is the function of the appendix?

asked by sofia
228. ## bio

what is the sociobiology controbersy?

asked by Allie
229. ## social studies/writing

we have i pproject and i need to find some information on washhiington d.c. i need to find a hisstoric place in washington d.c that starts a d-z. (i am still working on them.)

asked by April
230. ## math

what percent of 60 is 57

asked by blask
231. ## college

The average and SD of a set of 50 scores are 30 and 7, respectively. If each of these scores is increased by 10, then which of the following is true for the new set of scores?

asked by Anonymous
232. ## calculus

Let R be the region in the first quadrant bounded by the graphs of y=e^-x, y=1/2x+1, and x=2. Then find the volume of the solid when R is revolved about each of the following lines... the x axis, y=-1, y=2, the y axis, x=-1, and x=3.

asked by Drew
233. ## bio

What is the grandmother effect in humans? what is the grandfather effect?

asked by Allie
234. ## chemistry

Explain in a written statement how you would make 200.0 mL of a [Cl-] = 0.172 M solution starting with CaCl2

asked by gordon
235. ## algebra

simplify (x+3)^2= 19

asked by Anonymous
236. ## geometry

what are the symmetry properties of a regular octahedron and a cube?

asked by m
237. ## Math

Solve for y. 12y+11=-32y

asked by anonymous
238. ## algebra

explain this expression to an equivalent standard form quadratic expression (x+5)(4x-3)

asked by Anonymous
239. ## Finance

What problems may be indicated by an inventory turnover ratio that is substantially above or below the industry average?

asked by Sandy
240. ## grammar

What is the verb and helping verb of this sentence. Mary was studying for the test.

asked by Jennifer
241. ## Finance

What factors limit the use of the fixed-asset turnover ratio in comparative analyses?

asked by Sandy
242. ## calculus

Find the dimensions of a right circular cone, that holds one liter and is made with a minimum amount of sheet metal. It is open on the top.

asked by Lin
243. ## Finance

Market Size for software (Google) •Identify/profile the customer you cater to. •Calculate the TAM (top down), SAM (bottoms up) and SOM.

asked by CT
244. ## english

I have to write an expository essay on Second Hand Lions. How would i do that?

asked by kay
245. ## spanish

need pictures about story on fian arroyo

asked by m0nique
246. ## physics

A cannon mounted on a pirate ship fires a cannonball at 125 m/s horizontally, at a height of 17.5 m above the ocean surface. Ignore air resistance. (a) How much time elapses until it splashes into the water? (b) How far from the ship does it land?

asked by matt chirl
247. ## physics

An electron starts at rest. Gravity accelerates the electron in the negative y direction at 9.80 m/s2 while an electric field accelerates it in the positive x direction at 3.80×106 m/s2. Find its velocity 2.45 s after it starts to move.

asked by sue
248. ## exams

is there a good breakfast to eat before exams? like, is there a special food like fiber which would help me stay alert and ready?

asked by Gabby
249. ## science

Using the formula for the speed of a shallow-water wave, C = square root (g x d), what is the speed of a wave when d = 10 meters. The value of g = 10 m/s2.

asked by paula
250. ## math

My friends & I have posted this question before but are still confused on the answer. We know the equation but the calculator part is confusing so If anyone who answers this could give an exact answer to 6 decimal places that would be great. Then we can go

asked by Friends
251. ## People

The last question for my survey: A girl and a boy love each other a lot. They always text each other: "I Love You" and stuff. The girl never has the guts to say "I Love You" to the boy in reality. What can she do to fix this? This is my last survey

asked by Dream Gurly
252. ## infinitives

Jim had no choice except to resign from the position. to resign - infinitive used as an adverb?

asked by michael
253. ## geography

Taken as a whole, what would you say is the single most pressing problem found in Latin America or South America? What possible solutions can you develop?

asked by kaitlyn
254. ## PSY 202

How can adults reject negative influences and benefit from positive ones in their current life?

asked by Angela
255. ## chemistry

using a universal ph paper to test the Ph of purple grape juice is unlikely to be successful why

asked by dylan
256. ## Mathematics

What is the slope of the line described by the equation 1 _____________________________-x+-y=5___ ________________________________3______ i hope someone understands this problem

asked by Kendra
257. ## maths

how arithmetic and geometric progression can be used to solve problems related to banking business?

asked by kulwa
258. ## calculus

There is a right triangle with x and y legs labeled B and A, respectively. B is increasing at a rate of 1 m/s and A is decreasing at a rate of 2 m/s. At what rate is the angle theta (located on the leg B) changing when A is 10m and B is 20m?

asked by Nimra
259. ## global

Does cultural diffusion unite or divide our world today?

asked by Anonymous
260. ## Mathematics

If a pentagon is dialated which of the folloeing characteristics change? 1.side lenght 2.area 3.the coordinates i think tis 2 & 3 but not sure.

asked by Kendra
261. ## Algebra 1

What are three ordered pairs that are a soultion to the equation 3x-1=-2?

asked by LE
262. ## chemistry

my moth balls froze at 54 degrees celsius, what kind are they?

asked by Ali
263. ## french

How would you say it would be necessary using the verb falloir?

asked by peter
264. ## history

Identify and define the two other items (in addition to supply-side economics) that were a part of Reagan’s economic agenda.

asked by pam
265. ## Intermediate Algebra

I have a 72% in this class, but I think I made an F on my final, what is my final grade? please help me!!!

asked by lacey
266. ## algebra

y = 1/2 x -3. what is the slope? a)-3 b)3 c)1 d)1/2

asked by rusty
267. ## math

if (2+2i)squared= a+bi, compute the value of a+b.

asked by Yolonda
268. ## Algebra

Make d the subject L=4ðCx(x is set off the line)d^2

asked by joleen
269. ## infinitives

Adena wants Sam to learn to change a tire. to learn -infinitive used as adj. to change - infinitive used as an adverb?

asked by michael
270. ## MATH

simplify |-7+2|-|-4|

asked by RICH
271. ## algebra

parallel lines never meet because they are a) far apart b)equidistant c)horizontal d)vertical

asked by rusty
272. ## French

Please check if this is right: Demain matin, je vais aller à la ferme. Je n’ai jamais visité une ferme avant. D’abord, je vais faire une randonnée à pied. Ensuite, je vais voir: un cochon, un lapin, un cheval, une vache, un ècureuil, et un oiseau,

asked by Gabby
273. ## algebra

corresponding sides mean: a)the measures are equal b)the side is in a similar location c)the sides are opposite d)one side is shorter than the other

asked by rusty
274. ## infinitives

It was too late for Sam to register for the course. to register - infinitive is it used as a noun b/c it comes after for Sam?

asked by michael
275. ## History

Explain “supply-side” economics or “Reaganomics.

asked by Anonymous
276. ## Toms River

If you have 23 kids in a class how many of them are 5ft 2ins or taller? And how many are shorter?

asked by Ashley
277. ## physics

How to do worksheet on projectiles and horizontally

asked by Anonymous
278. ## geometry

What is the distance from the origin to the point (14,11)?

asked by Ashley
279. ## math

when you put something in parenthesis like C(25,8) what does that mean or how do you solve it?

asked by David
280. ## 4th grade

Nick had 1 3/4 gallon of milk. How many pints of milk does Nick have.

asked by David
281. ## Math

9 - 4 3/7

asked by Alyson
282. ## fractions- 3rd grade

Name 2 fractions that are equivalent to 3 4th

asked by Eddie
283. ## Math

10 - 5 4/11

asked by Alyson
284. ## BIO

How are enzymes able to speed up chemical reactions? Be sure to include examples,

asked by luly