1. Science

    Approximately what percentage of the estimated age of Earth does the Cenozoic Era represent and how do you know? look at pg. 9 in Earth Science Reference Tables? a. 1.4% b. 5.0% c. 11.9% d. 65.0%
  2. class

    Suppose that the scores of architects on a particular creativity test are normally distributed. Using a normal curve table, what percentage of architects have Z-scores: Above .10? Below .10? Above .20? Below .20? Above 1.10? Below 1.10? Above -.10? Below
  3. physics

    a compound consist of carbon,hydrogen and oxygen only.the percentage by mass are carbon 40.0% and 6,7% hydrogen.calculate the empirical formulae
  4. math

    If the store purchases an item at a wholesale cost of $3.50 per item, and it is sold at a retail value of $5.00 per item. What is the gross profit percentage of the item?
  5. math

    Traditions Clothing Store is having a sale. Shirts that were regularly priced at $20 are on sale for $17. What is the percentage of decrease in the price of the shirts?
  6. Chemistry

    Sorry for postiong twice. But I really need to know if the answers I am getting are correct; Nitrogen and oxygen react to produce nitric oxide according to the following equation: N2 (g) + O2 (g) → 2 NO (g) The equilibrium constant for this reaction is
  7. Math (Percentage)

    Chet bought a rug that cost $280. He had a coupon for a 10% discount. 1. How much money did he save with the discount? 2. How much did he pay for the rug?
  8. maths

    twenty-seven out of thirty students have a mobile work out the percentage of students who do not have a mobile phone! show each stage of working out? THANKYOU
  9. Math

    Adnan bought 96 eggs at the rate of RS.40 per dozen and sold at the rate of RS.4 per egg.find the percentage of profit if 3 eggs were rotten
  10. math percentage

    100 (572-498)/498 14.859437751 To the nearest tenth, what is the percent increase in attendance from last year to this year?
  11. Statistics

    Suppose that heights of newborns are bell shaped with a mean of 6.8 pounds and a standard deviation of 1.3 pounds. What percentage of weights are: a) Below 6.8 lbs.? b) Above 8.3 lbs.?
  12. Chemistry

    At 25 degrees Celsius, the base ionization constant for NH3 is 1.8 x ^-5. Determine the percentage ionization of a M solution of ammonia at 25 degree Celsius.
  13. math

    Shania has a box of coloured beads.2/5 of them are red.1/3 of the remainder is yellow and the rest is blue. What fraction of the beads is blue in percentage
  14. financial management

    On a Statement of Revenue and expense I have one year plus the percentage of change and I need to find the projected budget for next year Where can I find how to to do this problems
  15. statistics

    In a psychology class of 100 students, test scores are normally distributed with a mean of 80 and a standard deviation of 5. Approximately what percentage of students have scores between 70 and 90? A. 68% B. 80% C. 95% D. 99%
  16. Math

    A team has won 50% of the 60 games it played, find the number of games the team must win in succession to increase its winning percentage to 60%?
  17. computers

    write a c program to find the percentage marks where obtain marks and total marks is given by user also show the fail message if marks is less than 17%
  18. psychology

    If the mean score on a one mile running test was 14 minutes and the standard deviation was 1 minute what percentage of subjects ran the mile in 15 minutes or less
  19. Maths

    adnan bought 96 eggs at the rate of Rs.40 per dozen and sold at the rate of Rs.4 per egg.find the percentage of profit,if 3 eggs were rotten.
  20. math

    There are two distinct natural numbers. Each is first increased by 10 then by same percentage as each was increased for the first time. Each number finally results in 72 Find the difference between the numbers. 
  21. College algerba

    The​ half-life of a certain radioactive element is about 1500 years. After 2800 ​years, what percentage P of a sample of this element​ remains?
  22. Physics

    A circular steel plate of radius 15 cm is cooled from 300∘C to 80∘C. Part A By what percentage does the plate's area decrease?
  23. math

    could you show us the work on getting the answer 33.6% from the question if 125 people got parking tickets this month and 83 got tickets the next month. What is the percentage reduction?
  24. math

    income 1000 2000 3000 taxes 200 350 450 what percentage of income is paid in taxes at each level?
  25. Math

    The perfentage of residents in a city in Shreveport who recycle increased from 28.3% in 2000 to 31.1% in 2007. Predict the percentage of residents who will recycle in 2017.
  26. Statistics

    Suppose that heights of newborns are bell shaped with a mean of 6.8 pounds and a standard deviation of 1.3 pounds. What percentage of weights are: a) Below 6.8 lbs.? b) Above 8.3 lbs.?
  27. math

    The decay of uranium is modelled by D = D_0 * 2^(-kt). If it takes 6 years for the mass of uranium to halve, find the percentage remaining after: a. 2 years
  28. statistics

    IQ scores are normally distributed and assume that the average IQ for all Economics majors is 108 with a standard deviation of 11. What percentage of Economics majors would have an IQ of more than 118?
  29. chemistry

    What volume of 10 percentage (mass/volume) solution of Na2CO3 will be required to neutralise 100mL of HCl sution containing 3.65g of HCl.
  30. Biology

    My teacher asked me this question and I do not know the answer would you be able to tell me and why thank you large bodies loose a smaller percentage of heat to their surroundings than smaller bodies. Why?
  31. physics

    the speed of a wave on a string is 150m/s when the tention is 120n the percentage increase in the tension in order to rise the wave speed by 20% is
  32. math

    I sold a book on the Internet for $6.00. I could have sold it at my garage sale for $1.00. I made $5 more on the Internet. What is the profit as a percentage? What is the formula for figuring that per centage?
  33. physics

    the speed of a wave on a string is 150m/s when the tention is 120n the percentage increase in the tension in order to rise the wave speed by 20% is
  34. math

    the length of each edge of a cube is of length 3m. the edges are increased by 20%. Calculate the percentage increase in the volume of the cube.
  35. math grade 12

    A sheet of plastic stops 25% of the light and lets through the residual 75%. What percentage of the light is let through by two sheets of the plastic ?
  36. physics

    a ball dropped on to a floor .if the coefficient of restitution is 0.5.the percentage loss of energy of the ball on rebounding from the floor is?
  37. Math

    A shop owner increased the selling price of a shirt from $20.00 to $26.00. By what percentage was the price increased? I got the answer of 30 percent.
  38. Chemistry

    If 16.9 g of CO2 was produced from the thermal decomposition of 41.83 g of CaCO3, what is the percentage yield of the reaction? CaCO3(s) > CaO(s) + CO2(g)
  39. labor relations

    to most effectively increase its percentage of the labor force in the 1990s, the union movement should increase its appeal to:
  40. Statistics

    my z score for a rats liver glycogen percentage is -0.62 and the average population is 3.32. How can I analyze my z score? what does it mean relative to the population
  41. statistics

    The test scores of students in a class test have a mean of 65 and with a standard deviation of 8. What is the probable percentage of students scored more than 70?
  42. chemistry

    two-thirds of the atoms that make up H2S are hydrogen. What percentage of the weight of hydrogen sulfide is the weight of the two hydrogens?
  43. chemistry

    when 5g of impure sample of CH4 is completely combusted, 9g of H2O was produced.what is the percentage purity of the sample of CH4
  44. Statistics

    The percentage of adults who have been told at some point that they have hyptertension is 23.53%. If 10 adults are randomly selected, what is the probability that at least 8 have been told that they have hypertension?
  45. math

    The base of a parallelogram is 6 times its height if the base is cut in half,the new area is what percentage of the original area?
  46. ALGEBRA

    if a product that had a cost of rm2000 was sold with a markup percentage of 80% based on retail price, what was the retail price?
  47. percent discount (math)

    During a sale, Nancy found chalkboards on sale for $57 that had previously cost $75. What percentage is the discount?
  48. college

    Construct a frequency distribution table for the following scores. Include columns for proportion and percentage in the table. Scores: 5, 7, 8, 4, 7, 9, 6, 6, 5, 3 9, 6, 4, 7, 7, 8, 6, 7, 8, 5
  49. science

    If a blue eyed mother, bb, and a blue-eyed father, bb, had children, what percentage of their offspring would have brown eyes?
  50. Maths

    Determine the effective annual yield (annual percentage yield) for $1 invested for 1 year at 8.5% compounded monthly.
  51. stati

    12. Suppose 80% of students finish high school. Of them, 50% finish college. Of them, 20% get a master’s degree. Of them, 30% get a Ph.D. (i) What percentage of students get a Ph.
  52. Math

    I have the fraction 1/6. I need to express it as a decimal, fraction expressed with denominator 100 and percentage. Is it correct to have 0.16666; 16.66/100 and 16.66%?
  53. math

    There are 1500 poultry on a farm. 40% are chickens, 2/3 of the ramainder are ducks and the rest are geese. What percentage of the poultry are geese?
  54. math

    The base of a parallelogram is 6 times its height if the base is cut in half,the new area is what percentage of the original area?
  55. chem

    A 75.0mL sample of 1.56×10−2M Na2SO4(aq) is added to 75.0mL of 1.22×10−2M of Ca(NO3)2(aq). What percentage of the Ca+ remains unprecipitated?
  56. chem

    A 75.0mL sample of 1.56×10−2M Na2SO4(aq) is added to 75.0mL of 1.22×10−2M of Ca(NO3)2(aq). What percentage of the Ca+ remains unprecipitated?
  57. math

    If there are 300 students majoring in History and 150 majoring in English what is the percentage of that? How do you turn students to percents?
  58. math - marginal analyis

    A factory's output is Q=600K^1/2L^1/3 units, (read 600 x K to the 1/2 power x L to the 1/3 power). K denotes capital investment and L denotes the size of the labor force. Estimate the percentage increase in output that will result in a 2% increase in the
  59. At what temperature do hydrogen molecules have the

    At what temperature do hydrogen molecules have the same rms speed as nitrogen molecules at 90 degree C?
  60. college chemistry

    In the analysis of food, the nitrogen from the protein is sometimes converted into ammonia which is titrated against a strong acid. Given that the final NH3 concentration (approximate) is 0.2M and that pKa for NH4+ is 9.2, choose the best indicator for
  61. Accounts

    The estimated allowance for bad debts for the month of May using a percentage .5% on the net sales of 97,500. what is the bad debt expense for the month of may. I will like to see the calculation please.
  62. science

    As redioactive material decays and the percentage of new material in the original sample increases, does the age of the sample substance increase, decrease, or remain the same?
  63. Maths

    Mr Gosh purchased wrist watches worth Rs 60000. He sold one-third of them at a profit of 20% and remaining at a loss of 5%. Calculate his overall profit or loss percentage.
  64. Child care

    After establishment of your child care center, equipment and supplies will comprise what percentage of your annual operating budget? A .5% to 1.5% B 1.5% to 3% C 3% to 5.5% D 5.5% to 7% The correct answer is C
  65. newsome

    1. lactate has a molecular weight of 90.08. How much lactate is needed to make 3 liters of .15 molar lactate. 2.What is the percentage of lactate (it's a solid) in the solution made in question 1.
  66. College Chem

    When a0.269g sample of a barium compound was treated with excess H2SO4, 0.0891g of BaSO4 formed. What is the percentage of Barium in the compound?
  67. Algebra

    I need the equation for this problem: I sold some books for $10 total on the Internet. If I had sold them at my garage sale I only would have received $6 or $4 less. What percentage did I gain by selling on the Internet?
  68. maths help

    There are two distinct natural numbers. Each is first increased by 10 then by same percentage as each was increased for the first time. Each number finally results in 72 Find the difference between the numbers. How to do in simplified way please help
  69. math

    1. Anna mixes the letters s-e-l-e-c-t-e and d thoroughly. Without looking, mary draws one letter. expressed as a fraction, decimal, and percentage. what is the probability that e will not be the letter mary selects
  70. science

    can you save money on your electric bill from a regular electric company by choosing to use a percentage of wind power through them? Or does it make your bill higher?
  71. 7th grade math

    Suppose 36 videos are added to a video collection that has 24 videos. What is the percentage of change. I got 50 percent....my mom says it's 150 percent. thanks!
  72. Physics

    A golf ball, dropped from 2 meters above a floor, rebounds to a height of 1.6 meters. What percentage of its energy of motion is lost in the collision with the floor?
  73. math

    A (yearly) cash flow stream is x=(-40,10,10,10,10,10,10). The spot rates are (yearly in percentage) s=(5.0,5.3,5.6,5.8,6.0,6.1). Use the discount factors to determine the (net) present value of the stream.
  74. physics

    What percentage of a floating iceberg’s volume is above water? The specific gravity of ice is 0.917 and the specific gravity of the surrounding seawater is 1.025.
  75. math

    The ratio of marks obtained by Ashpreet and Bhupinder on an exam is 6 : 5. If the combined average of their percentage scores is 68.75%, and the sum of their marks is 275, what was the exam out of?
  76. math

    Benadryl is on sell this week for 20% off of the normal selling price at $10.00 per unit. If the pharmacy purchased Benadryl at $8.00 per unit, what is the gross profit percentage?
  77. physical chemistry

    This question is about a lab called Heats of Ionic Reaction in my Physical Chemistry class. I need to know why there should be a large percentage error in deltaH4
  78. Math percentage (Money problem tax, discount)

    After 15% off, the book price becomes $26, what was the original price of the book? Round to the nearest cent. I had $29.9 but it was wrong :(
  79. Algebra

    The function f(x)=(250x)/(100-x) models the cost, f(x), in millions of dollars, to remove x% of a river's pollutants. Use this functions to solve: If the government commits $750 million for this project, what percentage of the pollutants can be removed?
  80. science

    Calculate the pH of a solution of ammonium acetate (CH3COONH4) 0,85M knowing that for NH3 Kb = 1,79x10-5 and CH3COOH Ka = 1,76x10-5 and commented on the result obtained. Then calculate the percentage of acetic acid product at equilibrium
  81. chemistry

    A 1.252g sample containing iron is dissolved and converted to FE 2+ followed by addition of 25ml of 0.01M k2 cr2 07. The excess K2cr207 required 6.85 ml of 0.015M. Find the percentage FE304 FW 231g/mol in the sample. The right 7.96% Who helps me
  82. physics

    a)find the charge to mass ratio for an electron accelerated through 600v in a magnetic field of strength 45mT where the speed of the electrons is 1.4*10^7m/s b)what is the percentage difference b/n your result and the accepted ratio with the value
  83. Algebra

    The function f(x)=(250x)/(100-x) models the cost, f(x), in millions of dollars, to remove x% of a river's pollutants. Use this functions to solve: If the government commits $750 million for this project, what percentage of the pollutants can be removed?
  84. math

    1.64g of a mixture of cac03 and mhco3 was dissolved in 50ml of 0.8M hcl. The excess of acid required 16ml of 0.25M naoh for neutralization. Calculate the percentage of cac03 and mgc03 in the sample Who helps me
  85. business

    five companies contribute different amounts to a local charity. which visual could best illustrate the percentage of all the monies collected that each companys cntribution represented table bar chart line graph pie chart
  86. math

    If you deposit money in a savings account with an interest rate (APR) of 5% and the account compounds quarterly, which is your annual percentage yield (APY)? Convert your answer to a percent and round it to two decimal places.
  87. chemistry

    Monosodium glutamate (aka MSG) NaC5H8NO4 is used as a food additive for flavor or as a preservative. a. what is the mass of MSG (g) that contains 545 mg sodium? b. calculate the percentage of each element present in MSG.
  88. chemistry

    Sodium sulfate is slowly added to a solution containing 0.0500 M Ca2 (aq) and 0.0230 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate? What percentage of the Ca2 (aq) can be separated from the Ag (aq) by selective
  89. chemistry ap

    Nitric acid can be produced by the reaction of gaseous nitrogen dioxide with water. 3 NO2(g) + H2O(ℓ) −→ 2 HNO3(ℓ) + NO(g) If 734 L of NO2 gas react with water, what volume of NO gas will be produced? Assume the gases are measured
  90. chemistry

    A sealed cylinder of gas contains nitrogen gas at 1.00 ✕ 103 kPa pressure and a temperature of 28°C. The cylinder is left in the sun, and the temperature of the gas increases to 50.°C. What is the new pressure in the cylinder?
  91. chem

    a sealed cylinder of a gas contains nitrogen gas at 1.00*10^3 kPa pressure and a temperature of 20C. They cylinder is left in the sun and the temperature of the gas increases to 50C. What is the new pressure in the cylinder?
  92. Chemistry

    I'm trying to find if potassium nitrate is polar or non-polar by using the electronegativity scale. Can someone check my work? Electronegativity: potassium: 0.82 nitrogen: 3.04 oxygen: 3.44 =3.44-3.04 =0.82-0.4 =0.4 =0.42 So the final answer is 0.42 and by
  93. Math

    A frame around a photo is 5 cm wide. The photograph is 20 cm long and 10 cm wide. What percentage of the entire area is the frame.
  94. percentage

    If I put $5,000 in a CD for a miniumum of 3 years, the bank will offer 3.25% interest. How much interest will I earn after 6 years?
  95. Algebra (re: %)

    Sally took a test with 70 questions and she correctly answered 60 question. What percentage of the questions did she answer correctly?
  96. math

    Chris eats 3 slices of a pizza that is cut into 8 equal slices. What percentage of the pizza does he eat?
  97. ANT 101

    Matrilineality is the principle of descent in what percentage of world societies? 5 percent 15 percent 25 percent 35 percent
  98. math

    Top player's scoring average changes from 20 points per game to 24 points per game. What is the percentage of increase. 1:20% 2:16.7% I think 2??
  99. hellppp

    an assortment of coins contains 20 pennies, 2 nickels and 6 dimes. what percentage of the coins are nickels? show how is solved ?????????
  100. Physical Science

    If student A measures a laptop computer to be 37.2 cm long, and student B measures 36.7 cm, what is the percentage error?