Questions Asked on
May 3, 2013

  1. Chemistry

    Determine the solubility of a sodium sulfate, Na2SO4, in grams per 100g of water, if 0.94 g of Na2SO4 is dissolved in 20 g of water to make a saturated solution.

    asked by Alex
  2. Math

    19. Point A(4, 2) is translated according to the rule (x, y) (x + 1, y – 5) and then reflected across the y-axis. a) In which quadrant of the coordinate plane is point A located? b) What are the coordinates of translated point A’? In which quadrant of

    asked by Somebody
  3. physics

    A grindstone in the shape of a solid disk with diameter 0.520 and a mass of = 50.0 is rotating at = 860 . You press an ax against the rim with a normal force of = 250 (Figure 1) , and the grindstone comes to rest in 7.40 . Find the coefficient of friction

    asked by amy
  4. Math

    Elliot finished studying at 4:45 p.m. He spent 30 minutes reading a social studies chapter. he spent 45 minutes on his math homework. At what time did Elliot begin studying?

    asked by Quan
  5. math

    A regular hexagonal pyramid whose base perimeter is 60cm has an altitude of 30cm. The volume of the pyramid is??

    asked by Jeric
  6. chemistry

    A chemistry experiment needed 12.45 grams of chemical to produce one liter of a gas. If Zoe wanted 24 liters of gas, how many kilograms of the chemical will she need?

    asked by damien
  7. physics

    A wheel rotates without friction about a stationary horizontal axis at the center of the wheel. A constant tangential force equal to 83.N is applied to the rim of the wheel. The wheel has radius 0.110m . Starting from rest, the wheel has an angular speed

    asked by amy
  8. Chemistry

    Zinc has three major and two minor isotopes. For this problem, assume that the only isotopes of zinc are the major ones, zinc-64, zinc-66, and zinc-68. The atomic mass of zinc-64 is 63.9291 Da, that of zinc-66 is 65.9260 Da, and that of zinc-68 is 67.9248

    asked by Jess
  9. Calc BC

    Let f be the function defined by f(x)=(4x-8)/(x^2+5x-14) write an equation of the lien normal to the graph of f at x=1 how?

    asked by Lynn
  10. math

    A ladder 10 m long rests on horizontal ground and leans against a vertical wall. The foot of the ladder is pulled away from the wall at 2 m/s. How fast is the top sliding down the wall when the foot of the ladder is 6m from the wall?

    asked by Grant
  11. Statistics

    For questions 1-5, write the null and alternative hypothesis. 1. Does the water temperature have an effect on the number of people in the pool? 2. Does the weather have an effect on the number of people at the beach? 3. A fitness center is running a

    asked by Cam
  12. Algebra 2

    2. The lengths of boats in a harbor, in feet, are listed below. 17, 16, 56, 50, 14, 30 12, 33, 82, 16, 10, 52 25, 25, 19, 75, 24, 12 30, 12, 20, 38, 26, 36 33, 24, 18, 26, 40, 40 a. Make a frequency table for the data set. Use 5–14 as the first class

    asked by Michelle
  13. Chem.. stoichiometry

    How many grams of H2 would be formed if 34 grams of carbon reacted with an unlimited amount of H2O? The reaction is: C + H2O → CO + H2 Is this equation balanced?

    asked by Jenna Woodruff
  14. Chemistry Help

    How many moles of ammonia are produced when 2.5 moles of nitrogen are reacted with hydrogen?

    asked by Timofey
  15. Algebra 2

    Can In 5 + log2 10 be written as a single logarithm? Explain.

    asked by Bubble
  16. Math

    Problem Solving Work Backward The temperature was 16 degree Celsius when Becky returned home at 6 p.m. The temperature was 4 degree Celsius warmer at 3 p.m. than it was at 6 p.m. It was 3 degree Celsius warmer at 12 noon than it was at 3 p.m. What was the

    asked by Quan
  17. Physics

    As a fish jumps vertically out of the water, assume that only two significant forces act on it: an upward force F exerted by the tail fin and the downward force due to gravity. A record Chinook salmon has a length of 1.50 m and a mass of 53.5 kg. If this

    asked by Abdullahi A.
  18. Statistics

    1. A study of 40 people found that they could do on the average15 pull ups with a standard deviation of .6. Find the 99% confidence interval for the mean of the population. 2. A study of 50 pizza delivery workers found that they could make 6 deliveries per

    asked by Cam
  19. Chemistry II

    Calculate the pH at the equivalence point in the titration of 50ml of 0.20 M methylamine (Kb=4.3*10^-4) with a 0.40 M HCL solution.

    asked by Katie
  20. Physics (ASAP)

    Please, I need help with this problem A cue stick applies an average force of 66 N to a stationary 0.17 kg cue ball for 0.0012 s. What is the magnitude of the impulse on the cue ball? Thank you

    asked by Kathy
  21. music

    The _______ style is an attempt to revive the approach used by composers in the latter half of the eighteenth century. A. New Baroque B. Neo-classical C. Post-modern D. Pre-romantic

    asked by vee
  22. Statistics

    The Education Testing Service conducted a study to investigate differences between the scores of males and females on the SAT. The study identified a random sample of 562 females and 852 males that had achieved the same high score on the math portion of

    asked by Kate
  23. WorldHistory

    How was the structure of the Church like that of the feudal system? Feudalism is based on three things: fief, fealty, and faith. Translation: land, loyalty, religion. So basically the Church was a very important part of feudal society because it owned tons

    asked by _
  24. chemistry

    A nitric acid solution containing 71.0% by mass of the acid has a density of 1.42g/ml how many grams of nitric acid are present in 1.0L of this solution

    asked by cheryl
  25. Chemistry

    How many moles of P4O10 are produced when we react 8 moles of phosphorous with oxygen? I know the answer is: 4 mol P produces 1 mol P4O10 8 mol P produces 2 mol P4O10. Or, 1 mol P4O10 x (8 mol P / 4 mol P) = 2 mol P4O10. but, what is the balanced equation?

    asked by Timofey
  26. maths

    Two vertical poles, 3m and 7m long are on the same straight line with a point P on the ground. The shorter pole is 20m from P and the longer pole. The angle of elevation of the top T of the longer pole from the top R of the shorter one is 30degree,

    asked by Derrick
  27. ENGLISH

    Which one of the following sentences contains a predicate adjective? A. I brought my lunch for the first time this year. B. We scanned the distant shore for signs of life. C. What does this hard lesson teach you? D. The teacher appeared angry when Dave

    asked by NANA
  28. Math help please

    Do the data in the table represent a linear function? If so, write a rule for the function. x: –3 –2 –1 0 1 y: 1 –2 –5 –8 –11 yes; y = –3x – 8 yes; y = 1/3x – 8 yes; y = 1/3x + 8 yes; y = 3x + 8

    asked by Delilah
  29. AP Chemistry Help!!

    How many moles of P4O10 are produced when we react 8 moles of phosphorous with oxygen? I know the answer is: 4 mol P produces 1 mol P4O10 8 mol P produces 2 mol P4O10. Or, 1 mol P4O10 x (8 mol P / 4 mol P) = 2 mol P4O10. but, what is the balanced equation?

    asked by Timofey
  30. physics

    A stone is dropped into a well, and the sound of the splash is heard in 7.7 seconds, if the velocity of sound be 343 m/s, find depth of the well.

    asked by SHAHBAZ
  31. Elements of Calculus

    I cant seem to figure this one out, please help. A company is manufacturing kayaks and can sell all that it manufactures. The revenue (in dollars) is given by R=750-(X^2/30) where the production output in 1 day is x kayaks. If production is increasing at 3

    asked by HELP PLEASE
  32. algebra

    A certain office can purchase a photocopier for $5600 with a maintenance fee of $15 a month. On the other hand, they can rent the photocopier for $95 a month (including maintenance). If they purchase the photocopier, each copy would cost 3¢; if they rent,

    asked by Maho
  33. physics

    A pair of fuzzy dice are hanging by a string in my car from the rear-view mirror. I hit the gas pedal, and while I accelerate the fuzzy dice no longer hang straight down, but instead make an angle θ of 15 degrees with respect to the vertical. How fast am

    asked by ayan
  34. math

    the energy bar kyle is eating has 37 grams of carbohydrates.how many calories are from carbohydrates in the energy bar

    asked by sade
  35. math

    find the amount due on a $300 invoice received on june 3 and paid on june 11 if the sales terms are 3/15, n/30

    asked by Ashley
  36. physics

    find the %error in the measurement of refractive index of glass. the values was 1.54,1.53,1.44,1.54,1.56& 1.45.

    asked by vijana
  37. Physics

    A mechanic pushes a 2.60 103-kg car from rest to a speed of v, doing 5,000 J of work in the process. During this time, the car moves 21.0 m. Neglecting friction between car and road, find each of the following. (a) the speed v? (b) the horizontal force

    asked by Abdul A.
  38. algebra 1 help

    simplifying square roots 1) find volume of this prism? v=bwh b=√12" w=√6" h=√8" 2)simplify: √576 3)simplify: √400 4)simplify: √256 5)simplify: √(1/4)

    asked by anonymous
  39. Physics

    A horizontal force of 150 N is used to push a 32.5-kg packing crate a distance of 4.95 m on a rough horizontal surface. If the crate moves at constant speed, find each of the following. (a) the work done by the 150-N force? (b) the coefficient of kinetic

    asked by Abdul A.
  40. chem plz help :(

    A sample of helium gas occupies a 10 cubic meter container at STP (273 K, 1 atm). What will the approximate volume become when the pressure is 1.5 atm and the temperature is 32 oC?

    asked by nene
  41. WorldHistory

    Check? What were a peasants obligations to the lord of the manor? The peasant's obligations to the Lord of the Manor were based mostly on farming work. The peasant would work large proportions of their day on the land of their Lord, the rest of their day

    asked by _
  42. Math

    In the diagram below, AB is parallel to DE . AB =20 inches ,DE=12 inches, and BC=15 inches. what is the of DC?

    asked by Fahmida
  43. life orientation

    identify and describe three environmental health hazards that cause ill health,crises and or disasters within south africa and globally

    asked by dimakatso
  44. physics

    Two trains face each other on adjacent tracks. They are initially at rest, and their front ends are 36 m apart. The train on the left accelerates rightward at 1.11 m/s2. The train on the right accelerates leftward at 1.17 m/s2. How far does the train on

    asked by Anonymous
  45. Physics

    The distance between two telephone poles is 58.0 m. When a 1.00-kg bird lands on the telephone wire midway between the poles, the wire sags 0.240 m. Draw a free-body diagram of the bird. (Do this on paper. Your instructor may ask you to turn in this work.)

    asked by Abdullahi A.
  46. Elements of Calculus

    A company is manufacturing kayaks and can sell all that it manufactures. The revenue (in dollars) is given by R=750-(X^2/30) where the production output in 1 day is x kayaks. If production is increasing at 3 kayaks per day when production is 40 kayaks per

    asked by Tim
  47. Sociology

    8 complete sentences, compare and contrast the kinship and marriage system of the Kaluli and the Minangkabau.

    asked by Anonymous
  48. Physics 1

    A steel wire in a piano has a length of 0.5000 m and a mass of 3.800 10-3 kg. To what tension must this wire be stretched in order that the fundamental vibration correspond to middle C (fC = 261.6 Hz on the chromatic musical scale)?

    asked by Emily
  49. MATH

    if $250.00 IS INVESTED AT 6% COMPOUNDED MONTHLY WHAT IS THE AMOUNT AFTER 8YEARS

    asked by marie
  50. Chem

    Tt is found that an average volume of 24.25 ml of approximately 0.1 M NaOH is required to reach an endpoint in a titration with 25.00ml of 0.09917 M HCl solution. What is the NaOH concentration? Make sure to give answer to four significant figures.

    asked by Abenaa
  51. math

    The train slows down uniformly from a speed of 50m/s to a speed of 10m/s in a time of 20sec,During the next 30sec,it accelerates uniformly to a speed of u metres/sec.calculate the retardation from t=0 to t=20?

    asked by Meggy lep
  52. physics

    2. Determine the theoretical yield of aspirin if you started with 2.500 grams of salicylic acid?

    asked by Anonymous
  53. Chemistry 104

    The reaction of hydrogen peroxide, sulfuric acid and lead results in the production of lead sulfate in an acidic aqueous solution. Write the balanced equation for this reaction.

    asked by Sophie
  54. algebra

    A 15 cubic-foot aquarium is advertised as 2 feet tall and 3 feet wide. How deep is it?

    asked by Anonymous
  55. Science

    What is the written equation for the oxidation reaction of hydrogen chloride 4hcl+o2=2cl2+2h2o

    asked by Anonymous
  56. physics

    Rotating blade (body force in axial loading) blade is fixed to a rigid rotor of radius R spinning at ω rad/sec around the vertical z-axis. Neglect the effects of gravity. Calculate the peak stress in the blade: σmaxn Calculate the blade elongation: δ

    asked by rka
  57. math

    It is known that the number of people who enter a bank during a time interval of t minutes is a Poisson random variable with the parameter t. The bank opens at 8am and you arrive at the bank at uniformly random time between 8am and 9am. Let X be the

    asked by hao
  58. Dwamena Akenten SHS

    A pole 25m long is placed against a vertical wall such that its lower end is 7m from the foot of the wall on the same horizontal ground. If the upper end of the pole is push down by 2m, calculate correct to 2 significant figure: 1) how much further away

    asked by Derrick
  59. Chemistry 104

    Calculate Eo (reduction potential) for the following balanced reaction. NiO2 + 2H2O + 2Fe(OH)2 Ni(OH)2 + 2Fe(OH)3

    asked by Sophie
  60. math

    Which angle measure less than or equal to 360° is equivalent to an angle of .1`7`ª`$.?

    asked by Anonymous
  61. Chemistry PLEASE HELP!

    Manganese dioxide reacts with bromide ions to form manganese ions and bromate ions in an acidic aqueous solution. Write the balanced equation for this reaction. Select one: a. Br- + MnO2 + 3H2O Mn2+ + BrO3- + 2H3O+ b. Br- + 3MnO2 + 6H3O+ 3Mn2+ + 9H2O +

    asked by Sophie
  62. math

    what is the ratio 7.5 to 3.25 in lowest term?

    asked by faith
  63. science

    A solid sphere of radius r is gently placed on rough horizontal ground with an initial angular speed and no linear velocity if the coefficient of friction is find the time when the slipping stops in addition state the linear velocity and angular velocity

    asked by Prashant Sartale
  64. maths

    how many meters less than 1 over 2 km is 380 m?

    asked by lilly
  65. fin/375

    Suppose you start a business that has a soft opening and sells half of the expected product in the first quarter. You notice towards the end of the quarter that sales pick up near what was expected. How much working capital might you need to budget ahead

    asked by at
  66. WorldHistory

    Check? What are the three ways that civilization in western Europe declined after the Roman Empire fell? Answer: 1. All government stopped and didn't exist after the fall of Rome. The society fell apart . 2. Because of no government there was no army for

    asked by _<3
  67. Economics

    Explain the economic logic behind OPEC's decision to reduce output

    asked by Anikie
  68. Statistics

    In planning a study of the birth weights of babies whose mothers did not see a doctor while pregnant, a researcher writes the hypotheses as H0: x̄ = 2250 grams versus H1: x̄ < 2250 grams. What is wrong with this?

    asked by Abenaa
  69. maths

    f(x) is a polynomial with integer coefficients and degree at most 10. There are N distinct integer values for which f(n)=2, and M distinct integer values for which f(m)=−2. What is the maximum possible value of NM?

    asked by jfchfrhrc
  70. CHEM

    How many liters of O2 will react with 100 liters of H2 according to the gas phase reaction: O2 + 2H2 ------2H2O

    asked by MICHELLE
  71. Math help please

    I need to explain how to write a function rule from the table below and also write a function rule for this table: x: 2 4 6 y: 1 0 –1 How do you do this?

    asked by Delilah
  72. physics

    you are standing on roof of a building you have one stone and a stopwatch with you.how can you find height of the building

    asked by gaurav
  73. math

    You are interested in purchasing a wide-screen television set at Target. On this type of TV, the ratio of screen width to screen height is 16 to 9. If a certain model you are considering has a screen width of 48 inches, what is the height of the screen (in

    asked by Anonymous
  74. Chemistry 104 PLEASE HELP ME!!

    Calculate Eo (reduction potential) for the following balanced reaction. NiO2 + 2H2O + 2Fe(OH)2 Ni(OH)2 + 2Fe(OH)3

    asked by Sophie
  75. physics

    if a car goes twice as fast will the breaking distance also double

    asked by Anonymous
  76. Phy. Sci.

    What are the forces on two charges of +0.43 C and +1.4 C, respectively, if they are separated by a distance of 3.7 m?

    asked by Bob
  77. math

    A box contains blue and white ribbons. If five ribbons are choosen at random, how many ways can at least 1 blue ribbon be selected?

    asked by marlene
  78. MATH

    a purse contains $1.35 in quarters nickels and dimes There are 3 times as many dimes as quarters and 3 more nickels than quarters. find the number of each coin

    asked by JAYLA
  79. WorldHistory

    What were two inventions from Asia that changed the technology of warfare in western Europe? The leather saddle and stirrups

    asked by _
  80. physics

    What would be the final temperature when 125g of 25 degrees Celcius water is mixed with 85g of 45 Degrees Celcius water? ( hint: Equate the heat gained by the cool water with the heat lost by the warm water.)

    asked by Maddie
  81. Science

    How can weather observations be used to discover the effect of a mountain range on the pattern of precipitation?

    asked by Perry
  82. applied math

    A boat is located at a random location uniformly distributed inside of the circular pool of radius 1 mile. The boat is tied by a rope to a pole located directly at the center of the pool. A bird lands on the rope at the uniformly random location. If X is

    asked by hsuan
  83. Physics

    A 69-kg base runner begins his slide into second base when he is moving at a speed of 3.7 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical

    asked by Abdul A.
  84. math

    Show that for random variables X, Y and Z we have E[E[E[x|y]|z]] = E[X]:

    asked by hsuan
  85. math

    You are driving a car and the speed is an exponentialy distributed random variable with mean 50 (in miles per hour). The speed limit is 60 miles per hour, and if your speed is x > 60 miles per hour, the probability you are stopped by the police is 1 -

    asked by hsuan
  86. statistics

    400 draws are made at random with replacement from 5 tickets that are marked -2, -1, 0, 1, and 2 respectively. Find the expected value of: 1. the number of times positive numbers appear 2. the sum of all the numbers drawn 3. the sum of the positive numbers

    asked by AmmanJordan
  87. CHEMISRTY

    How many liters of H2O will form when excess O2 reacts with 100 liters of H2 according to the gas phase reaction:

    asked by KRISTY
  88. Financial Accounting

    Calculate accounts receivable turnover ratio. Calculate accounts receivable turnover ratio. Selected information from Mystic Corporation’s balance sheet at December 31, 2010 and income statement for the year ended December 31, 2010 is as follows: Cash

    asked by Anonymous
  89. Math

    Given S =(a,b,c) , T =(b,c,d) and W = (a,d) Find S x T x W

    asked by Pug
  90. Math Calculus

    The function f is given by the formula f(x)=6x^3+17x^2+4x+21/x+3 when x

    asked by URGENT
  91. Physics...NEED HELP

    Physics help. what are the steps to solving the following problems? Attack on the ice fortress! A comic book villain has taken shelter in an ice fortress in an attempt to hide from the Avengers. Apparently, though, only the Hulk and some guy with a cannon

    asked by Greg
  92. SAS Code For Goldfeld

    Can someone check my code and tell me what I am doing wrong? My regressions are not changing so i think my code must be wrong. data foodus; input y x n; cards; 15.998 62.476 1. 16.652 82.304 5. 21.741 74.679 3. 7.431 39.151 3. 10.481 64.724 5. 13.548

    asked by Robocop
  93. math

    show that 1-sin x/cosx + cosx/1-sin x = 2 sec x

    asked by tanya
  94. Microbiology

    How can lab practices and safety precautions help reduce hazards in a lab setting? How do you handle blood cultures and pathogenic strains in a lab to minimize contamination?

    asked by Sara
  95. Life orientation

    Describe the life style disease/behavior and explain factors that contribute to the disease.

    asked by Rebecca
  96. grammar

    5. Identify which of the two sentences below contains a verb agreement error. Then, explain how to correct the problem a. The serious look in that young girl’s eyes worry me. b. Some people know more about their favorite TV characters than they do about

    asked by Shorty
  97. Math (Algebra)

    How many distinct rational numbers can be expressed in the form a/b, where a and b are integers such that 1 ≤ a < b ≤10?

    asked by Arnau
  98. Math (Algebra)

    You are trying to distribute 566 ice creams and 183 cookies evenly to all of the students in a class. But you end up having 5 ice creams left and 4 cookies short. What is the maximum number of students in the class?

    asked by Arnau
  99. math

    Month J F M A M J J A S O N D TOTAL 0 0 0 0 1 21 27 16 12 2 0 0 The chart above represents the monthly rainfall in inches in Calcutta in a certain year. Calculate and explain the significance of the following measures based on this data.

    asked by Jenny
  100. Life oriantation

    What is the recommendations on how to address hiv/aids

    asked by Mulalo
  101. music

    What is music called when it is written in 2 or more chords played simultaneously?

    asked by vee
  102. Algebra

    Solving equations simultaneously: .7*x+.30*y=33.1 (x*y)/(.7*y+.30*x) = 3.66 I get stuck after I get 51.972=45.2y-.42y^2 I know the answers are supposed to be x=2.6 and y=104

    asked by Katelyn
  103. substance

    10-15 lines critically discuss 5 ways in which the human problem impacts on the community

    asked by gloria
  104. Algebra 1

    Using the same formula and the accompanying figure, deduce a formula for the altitude, h, of an equilateral triangle in terms of its side, c. really need help don't know what it means by "accompanying figure" because there's nothing "accompanying" it!! :/

    asked by Need Help NOW!!!
  105. prob

    Consider the triangle with vertices (0; 0), (1; 0) and (0; 1). Let Z be a uniform random variable in the interval [0; 1]. Draw a vertical line that intersects the x axis at Z. This line divides the triangle in two pieces. Select a point (X; Y ) uniformly

    asked by hsuan
  106. Statistics

    One of your friends is comparing yeast fermentation rates when yeast is grown in a solution containing glucose (G) and when grown in a solution containing starch (S). The friend starts with no expectations about which feeding medium will give higher yields

    asked by Abenaa
  107. science

    In trying to lift a heavy stone into a moving truck, a worker utilizes rope, a rug, and two long planks of wood. Identify what forces are at work in making it too hard for the worker to just lift the stone up on his back.

    asked by Jenny
  108. math

    It is known that the number of people who enter a bank during a time interval of t minutes is a Poisson random variable with the parameter t. The bank opens at 8am and you arrive at the bank at uniformly random time between 8am and 9am. Let X be the

    asked by hsuan
  109. Algebra

    Solve for x. Round to the nearest hundredth. ln x = − 4/9 x =

    asked by Tanya
  110. Algebra

    Write the logarithm in expanded form. log2(y^5)

    asked by Tanya
  111. probablity

    You are off to soccer and love being a goalkeeper, but that depends who is the coach today : - with coach Ahmed the probablity of being a goalkeeper is 0.5 -with coach Usman the probability of being a goalkeeper is 0.3 Ahmed is coach more often.About 6 out

    asked by arzam
  112. life orintation

    10 ways in which the environmental hazard can impact negatively on air pollution

    asked by lerato
  113. math

    Submit the two equations that represent the cost of going to the gym based on if we join or do not join. Identify the number of times a person would go and have the costs of the 2 plans be the same.

    asked by bryant
  114. WorldHistory

    Check? What are the three ways that civilization in western Europe declined after the Roman Empire fell? Answer: 1. Decline of centralized government-Barbarian invasions of Britain, Gaul, Italy and parts of the Eastern Roman Empire led local populations to

    asked by _<3
  115. math

    Some books give the following rule of thumb for finding the standard deviation of a normally distributed variable: s= range/6. Explain why this rule works.

    asked by Moyer
  116. WorldHistory

    3.What were two inventions from Asia that changed the technology of warfare in western Europe? So, it should be gunpowder and flame thrower?

    asked by _<3
  117. Physics (ASAP PLEASE)

    Please, help me answer this question. Two balls are moving in the same direction. Ball A has half the mass of ball B, and is moving at twice its speed. (a) Which ball has the greater momentum? (b) Which ball has greater kinetic energy? Thank you

    asked by Kathy
  118. Calculus

    Use Newton’s method to approximate the root of x^2 + 4x + 2 = 0 between x = -4 and x = -3 .

    asked by Grant
  119. physics

    if the angle between the incident ray and reflected ay is 120 degrees, what is the angle of reflectio?

    asked by Anonymous
  120. Algebra

    Solving equations simultaneously: .7*x+.30*y=33.1 (x*y)/(.7*y+.30*x) = 3.66 I get stuck after I get 51.972=45.2y-.42y^2 I know the answers are supposed to be x=2.6 and y=104

    asked by Katelyn
  121. Calculus

    Given the function f (x) = 3cos x for the interval 0 < x < 2 sketch the graph of the function

    asked by Grant
  122. math

    A Cold Stone Creamery ice cream shop sells sundaes for $3.60 and banana splits for $4.25. The shop sells four times as many sundaes as banana splits. If total sales amounted to $3,730 last weekend, how many banana splits were sold?

    asked by Shea Collins
  123. social studies

    The _____ implements legislation.

    asked by ammooorr
  124. Math (Algebra)

    How many distinct rational numbers can be expressed in the form a/b, where a and b are integers such that 1 ≤ a < b ≤10?

    asked by Bob
  125. algebra.. HELP ME!!!

    How many pairs of integers (x,y) satisfy the conditions y=3x−1, 6x−2y=2 and 0≤x≤25?

    asked by fudgee
  126. precalculus

    Find an equation for the parabola that has its vertex at the origin and directrix x=-9. If your answer is in the form x^2=Ay, then input here: A= if your answer is in the form y^2=Ax, then input here: A= .

    asked by dylan
  127. college agebra

    (3xsquared-2x-1)(xsquared+x+5)

    asked by jessica
  128. calculus

    The function f is given by the formula f(x)=6x^3+17x^2+4x+21/x+3 when x

    asked by Unknown
  129. calculus

    Given the function f (x) = 3cos x for the interval 0 < x < 2pi, determine the concavity of the function, between the critical values

    asked by Grant
  130. statistics

    A firm having 4000 employees took a random sample of 25 in order to estimate their average annual state tax payment with 99% confidence. If the results were X = $640 and s = $20, what is the best interval estimation?

    asked by Kate
  131. Physics (ASAP)

    Please I need help. I don't know how to do this problem without the SPEED VALUE. A sport utility vehicle is travelling at a speed of v m/s. If its momentum has a magnitude of 32,800 kg·m/s, what is the SUV's mass? _______ kg Thank you.

    asked by Kathy
  132. math

    Find the general solution of cos2x + 3 sin x =2

    asked by tanya
  133. maths

    If the product of two positive integers is 363, and the least common multiple of them is 33, what is the sum of the two positive integers?

    asked by ianian
  134. CHEM

    FIND NO OF ELECTRONS IN IMOLE OF CH4

    asked by Anonymous
  135. math

    Twenty-three coins are tossed; in how many ways can you have at least two tails?

    asked by marlene
  136. Algebra

    Solve for x. Round to the nearest hundredth. ln(x) = -1.8 x =

    asked by Tanya
  137. maths

    The monthly standing charge for a electrical company is €12.50 plus a cost of €0.16 per unit of electricity used. A customers monthly bill was €156.18. Determine how many units of electricity the customer used in that month.

    asked by james
  138. physics

    In trying to lift a heavy stone into a moving truck, a worker utilizes rope, a rug, and two long planks of wood. Identify what forces are at work in making it too hard for the worker to just lift the stone up on his back.

    asked by mary
  139. math

    776÷ (1/4 + 1/5)

    asked by Larry
  140. math

    To square 75, one can multiply (70)(80) and add 25 to that product. Can someone explain how this would work, without calculating?

    asked by Jenny
  141. life orientation

    Waya in which hiv/aids problem impacts onthe community

    asked by meshack
  142. computers

    why is payroll for employees and human resources listed as a co-number 11 business priority

    asked by Tiffany
  143. english 4

    Which statement best summarizes the political and social atmosphere of 18th century Great Britain.

    asked by lola
  144. Calculus help please!

    Find the Antiderivative of 3/(3x+5) with steps

    asked by Jordan
  145. psychology

    To gain acceptance, ahypothesis must be: a. suggested by a credible authority. b. kept secret until the research is completed. c. imaginative and appealing. d. backed by empirical evidence. i choose the answer d is that correct. ASsp

    asked by kaye
  146. Math

    Sales tax an item that cost $3.00 + tax rate is 6%

    asked by Pete
  147. chemistry

    What volume (in liters) of 0.96 M KOH solution should be added to a 0.090 L solution containing 9.9 g of glutamic acid hydrochloride (Glu, FW=183.59; pKa1=2.23, pKa2 =4.42, pKa3=9.95) to get to pH 10.20?

    asked by shanonn
  148. math

    To square 75, one can multiply (70)(80) and add 25 to that product. Can someone explain how this would work, without calculating?

    asked by Jenny
  149. earth science

    Why do deciduous trees lose their leaves in the fall?

    asked by mary
  150. maths

    You are off to soccer and love being a goalkeeper, but that depends who is the coach today : - with coach Ahmed the probablity of being a goalkeeper is 0.5 -with coach Usman the probability of being a goalkeeper is 0.3 Ahmed is coach more often.About 6 out

    asked by arzam
  151. Life orientation

    Discuss in a paragraph of 150 words ways in which one can take responsibility to prove safe and health living environment

    asked by shanny
  152. math

    You are driving a car and the speed is an exponentialy distributed random variable with mean 50 (in miles per hour). The speed limit is 60 miles per hour, and if your speed is x > 60 miles per hour, the probability you are stopped by the police is 1 􀀀

    asked by hsuan
  153. math

    A machine prints out the number 1, 2, or 3 with equal probabilities. A machine starts printing numbers independently one after another and stops the rst time it prints 1. Let X denote the number of 2s it printed. Compute E[X] and var(X).

    asked by hsuan
  154. math

    Break a stick of length 1 at a uniform location and then choose either of the two parts with equal probabilities. If X denotes the length of the part you choose, compute E[X] and var(X).

    asked by hsuan
  155. Physics

    A rowboat crosses a river with a velocity of 3.37 mi/h at an angle 62.5° north of west relative to the water. The river is 0.590 mi wide and carries an eastward current of 1.25 mi/h. How far upstream is the boat when it reaches the opposite shore?

    asked by Abdul A.
  156. math

    Let F,G be vector fields on the plane such that both com-positions F dot G, G dot F : R^2 -> R^2 -> R^2 are the identity (x, y)->(x, y). Prove that the fi eld F is incompressible if and only if G is incompressible. (A vector fi eld is called

    asked by dayyann
  157. math

    The price p(t) of a share at a time t satisfi es the equation p + t = 1 + e^-p sin(pi*t). Justify if p(t) is increasing or decreasing at t = 0.

    asked by dayyann
  158. math

    Positions of a woman and her dog at any time on the complex plane are z and 2z^2013 + z + 1, respectively. How many turns does the dog make around the origin if the woman goes once along the circle |z| = 1?

    asked by dayyann
  159. math

    You randomly choose 28 days for your work in March. Find the probability that you are o work on 8th and 16th and 24th March.

    asked by dayyann
  160. maths

    Consider the following system of inequalities: {(c−1)x^2+2cx+c+4≤0 cx^2+2(c+1)x+(c+1)≥0 The sum of all real values of c, such that the system has a unique solution, can be written as ab, where a and b are coprime positive integers. What is the value

    asked by sara
  161. math

    As θ ranges over all real values, what is the maximum value of (14sinθ+5cosθ)^2

    asked by rohit
  162. physics

    please tell me f(x)=rho_1*g*A the solution of which question I cannot understand plz give the 3 to 4 words of question as a hint

    asked by faryia
  163. math

    a piece of land in the shape of a reguler pentagon has a perimeter of 400m.calculate one side

    asked by sam
  164. Electronics

    Here we examine noise in a digital channel between an AND gate and an inverter shown in Figure 16. The channel has a length of D=30m and noise is added in at the rate of 0.6Vm. To correct for that noise, we introduce non-inverting buffers into the channel.

    asked by AmmanJordan
  165. Computer

    Why is runaway child process dangerous for long running server?

    asked by Steve
  166. math

    differentiate 3^(x^2). my ans is 3^(x^2) 2x ln 3. is it correct?

    asked by ifi
  167. Science

    Please for the terms associated with the study of levers.

    asked by Juanita
  168. PHYSICIAL SCIENCE

    JAGGER APPLIES A FORCE TO THE BASEBALL AS HIS ARM MOVES A DISTANCE OF 1.0 M USING A RADAR GUN THE COACH FINDS THAT THE BALL HAS A SPEED OF 18M/S AFTER IT IS RELEASED A BASEBALL HAS A MASS OF 0.15KG CALCULATE THE FORCE THAT JAGGER APPLIED TO THE BALL

    asked by Anonymous
  169. Physics..HELP PLEASE!!

    Here's a neat trick. If your average ceramic bowl has a mass of 200 g, what is the difference in Newtons between the weight of the bowls on the top of her head before and after she does the trick? Details and assumptions The acceleration of gravity is

    asked by Oian
  170. math

    differentiate. y=2^(5x) my ans is y'=2^(5x)5 ln 2. is it correct?

    asked by ifi
  171. MATHS~~

    How many positive integers less than or equal to 1000 are common multiples of the three numbers 27,225, and 135?

    asked by Oian
  172. Math (Trigonometry)

    Given that sin 53∘ = T, how many values of N, subject to 0 ≤ N ≤ 1000 are there, such that sin N∘ = T?

    asked by Bob
  173. spanish

    what does la mesa mean?

    asked by Anonymous
  174. Social science

    Difference between god and man?

    asked by chandan kumar
  175. MATHS

    Find the value of 1/10+1/100+1/1000+1/10000+... Leave your answer as a fraction

    asked by RS
  176. ,math

    show that sec theta(cosec theta) - cot theta = tan theta

    asked by tanya
  177. maths

    If the product of two positive integers is 363, and the least common multiple of them is 33, what is the sum of the two positive integers?

    asked by ianian