Questions Asked on
August 3, 2015

  1. Algebra ASAP

    The half-life of krypton-91 ^(91Kr) is 10 seconds. At time t = 0 a heavy canister contains 6 g of this radioactive gas. (a) Find a function m(t) = m02^−t/h that models the amount of ^(91)Kr remaining in the canister after t seconds. m(t) = (b) Find a

    asked by Fay
  2. Urgent math

    The initial size of a culture of bacteria is 1000. After one hour the bacteria count is 4000. (a) Find a function n(t) = n0ert that models the population after t hours. n(t) = b)Find the population after 1.5 hours. (Round your answer to the nearest whole

    asked by Emma
  3. math

    A grocer wishes to blend two different coffee brands because he wants to make a blend of 480 pounds to sell at $2.68 a pound. If he uses a brand of coffee worth $2.50 a pound with another brand worth $2.80 a pound, how many pounds of each does he use?

    asked by Anonymous
  4. Urgent math

    population growth model. Can anybody please help me out in trying to solve this problem? It's my homework and I don't seem to understand what I am getting. The count in a culture of bacteria was 400 after 2 hours and 25,600 after 6 hours. (a) What is the

    asked by Lydia
  5. Chemistry

    Water is sprayed on oranges during a frosty night. If an average of 11.8 g of water freezes on each orange how much heat is released. Can you please help me set this problem up. I don know what formula to use? thank you

    asked by SS
  6. Equilibrium

    An equilibrium mixture at 852 K is found to contain 3.61*10^-3 mol/L of SO2, 6.11*10^-4 mol/L of O2, and 1.01*10^-2 mol/L of SO3. Calculate the equilibrium constant Keq, for the reaction where SO2 and O2 are reactants and SO3 is the product. Equation would

    asked by Tyler
  7. physics

    A projectile is fired from a cliff 300 m high with an initial velocity of 400 m/s. If the firing angle is 30 degrees from the horizontal, compute the horizontal range of the projectile.

    asked by Gela
  8. calc

    Use the graph of f(t) = 2t + 4 on the interval [−4, 6] to write the function F(x), where f of x equals the integral from 2 to x of f of t dt.

    asked by Anonymous
  9. calc

    Use the graph of f(t) = 2t + 4 on the interval [−4, 6] to write the function F(x), where f of x equals the integral from 2 to x of f of t dt.

    asked by Anonymous
  10. Chemistry

    1.00g of oxygen combine with 0.126 g of hydrogen to form H2O. 1.00 g of nitrogen combie with 0.216 g of hydrogen to form ammonia. Predict the weight of oxygen required to combine with 1.00 g nitrogen to form an oxide.i m a student

    asked by Rao
  11. Chemistry

    The percent is confusing me, can you please help me set this equation up. How much heat is liberated when 5.00 kg of coal is burned if the coal is 96.2% carbon by mass and the other materials in the coal do not react? (delta)H comb of carbon is -394kJ/mol

    asked by Syd
  12. Physics

    A lighted candle is placed 38 cm in front of a diverging lens. The light passes through the diverging lens and on to a converging lens of focal length 10 cm that is 5 cm from the diverging lens. The final image is real, inverted, and 19 cm beyond the

    asked by Ali
  13. Algebra ASAP

    Suppose that $17,000 is invested in a savings account paying 5.1% interest per year. (a) Write the formula for the amount A in the account after t years if interest is compounded monthly. A(t) = (b) Find the amount in the account after 3 years if interest

    asked by Fay
  14. College Algebra

    This exercise uses the radioactive decay model. A wooden artifact from an ancient tomb contains 80% of the carbon-14 that is present in living trees. How long ago was the artifact made? (The half-life of carbon-14 is 5730 years. Round your answer to the

    asked by Melany
  15. Urgent math

    please help The fox population in a certain region has a relative growth rate of 7% per year. It is estimated that the population in 2005 was 19,000. (a) Find a function n(t) = n0ert that models the population t years after 2005. n(t) = (b) Use the

    asked by Lydia
  16. College Algebra

    This exercise deals with logarithmic scales. Earthquake A had a magnitude of 8.2 on the Richter scale. At the same time an earthquake B with magnitude 4.8 caused only minor damage. How many times more intense was earthquake A than earthquake B? (Round your

    asked by Melany
  17. Physics

    Force of 2.25N is acting on charge 15x10^-4C at any point. Find the Electric Field Intensity at that point.

    asked by Clifford
  18. Physics

    A convex mirror (f1 = −6.30 cm) and a concave mirror (f2 = 9.50 cm) are facing each other and are separated by a distance of 24.0 cm. An object is placed between the mirrors and is 12 cm from each mirror. Consider the light from the object that reflects

    asked by Ali
  19. life science

    Investigation to determine whether expired air contains carbon dioxide how should state the method,step by step for the experiment

    asked by john
  20. Math

    jack and jerry can complete a job together in 4 hours. if jack require 6 hours to do the job alone, how many hours will it take jerry to do the job alone. A.12 B.10 C.8 D.6 E.4

    asked by Michelle
  21. Trigonometry

    A segment of height 3 inches (distance from center ofchord to center of arc) has an arc of .4 radian.find the area of a segment.

    asked by Kenneth
  22. Math

    Julia spent 1/3 of her birthday money. Then she lost 1/2 of the rest. She now has $10.00 dollars left.how much did she get for her birthday.

    asked by Jeremiah
  23. Math

    Sara is making cookies and the recipe calls for 2 1/2 (2.5) cups of sugar to make two dozen cookies. How many cups of sugar will she need to make five dozen cookies? Express the answer as a mixed fraction and as a decimal

    asked by Cheyenne
  24. Chemistry

    1.00g of oxygen combine with 0.126 g of hydrogen to form H2O. 1.00 g of nitrogen combie with 0.216 g of hydrogen to form ammonia. Predict the weight of oxygen required to combine with 1.00 g nitrogen to form an oxide.

    asked by Rao
  25. HISTORY,GEOGRAPHY,MATHS LIT,LIFE ORIENTATION,...

    OK HEY,,,IM LOST I DON'T KNOW WHAT TO DO NEXT YEAR BECAUSE IM CURRENTLY DOING MY LAST YEAR AT HIGH SCHOOL SO HELP ME,,WHAT MUST I DO?

    asked by UZUAKHANYE
  26. physics

    a stone projected horizontally from the top of a tower with a speed of 4m/s lands on the level ground at a horizontal distance 25m from the foot of the tower. calculate the height[g=10m/s2]. is it u squared divided by 2g

    asked by Emmanuel
  27. Urgent math

    g(x) = log3(x + 3) state its domain, range, and asymptote. i am having trouble with this can somebody help me?

    asked by Emma
  28. Chemistry

    Can you please help me with this problem, I am so confused, and I do not know how to set it up, what equation to use, and what do i need to convert. 1 Transportation Ethanol is being used as an additive to gasoline. The combustion of 1 mol of ethanol

    asked by Syd
  29. Physics

    charges of -6nC and 4nC are 3m apart.(a)Determine the force they exert on each other.(b) the net electric field intensity at a point midway between them.

    asked by TechyBoy
  30. English

    Archetypes frequently appear in literature with - a- contradictory themes b- general themes c- universal themes d- specific themes my answer is D

    asked by Steve
  31. Urgent math

    i need help with these two homework problems Use the Laws of Logarithms to combine the expression into a single logarithm log2 5 − 5 log2 x + 1/2 log2(x + 1) Solve the logarithmic equation for x log2(x + 2) + log2(x − 1) = 2

    asked by Emma
  32. chemistry

    Could you please tell me the objective, theory and mechanism,result, precautions and applications of following experiment : reaction of 4-aminotoluene and o-vanillin(preparation of azomethine)

    asked by Edward
  33. life orientation

    List and discuss any four factors that could threaten or limit the core functions of the media

    asked by nokwazi
  34. Precaculculus

    Suppose you are told that log(2)=0.3562 and log(3)=0.5646. All of them with the base of 'a'. Find: i) log(6) ii) log(9) Solutions i) log(6)= log (3)(2) = log 3 + log 2 = 0.5646 + 0.3562 = 0.9208 ii)log(9)= log 3^2 = 2 log 3 = 2 (0.5646) = 1.1292

    asked by Aron
  35. Geometry

    What is the Midpoint of CD given the coordinates C(-4,8) and D(8,-4)?

    asked by Connor
  36. Life science

    Why are thesa fossils important discoveries?

    asked by Eunice
  37. Leshikishiki

    Research on processes of campaigns and protests

    asked by Dipolelo
  38. Equilibrium

    The following reaction has an equilibrium constant (Keq) of 160. 2 NO2(g) 2 NO(g) + O2(g) What will be the reaction quotient (Q) and in which direction will the reaction proceed if the partial pressure of NO2 is 5.0*10^-4 atm, NO is 0.080 atm, and O2 is

    asked by Tyler
  39. Equilibrium

    An aqueous solution of carbonic acid reacts to reach equilibrium as described below. H2CO3(aq) + H2O(l) HCO3^-(aq) + H3O^+(aq) The solution contains the following solute concentrations: Carbonic Acid: 3.3*10^-2 mol/L HCO3^-: 1.19*10^-4 mol/L H3O^+:

    asked by Tyler
  40. JNV

    An isotope has a 12.4 hrs half-life. If it has an activity of 30mCi at noon today, what was its activity at 3 pm yesterday?

    asked by VSG
  41. life science

    At high altitude the atmospheric pressure is lower and the air is less dense than at low altitude.this means that at high altitude there is less oxygen available for gaseous exchange thus gas exchange becomes less efficient. what conclusion can be

    asked by merissa
  42. Chemistry

    Given the following reaction: 3 H2(g) + N2(g) 2NH3(g) + heat If the following changes were to occur what direction shift will it have (left or right) And what will be the reason of the shift Changes/Stress on system: Adding NH3 Decreasing the pressure

    asked by Sarah foster
  43. Chemistry

    Given the following reaction: 3 H2(g) + N2(g) 2NH3(g) + heat If the following changes were to occur what direction shift will it have (left or right) And what will be the reason of the shift Changes/Stress on system: Adding NH3 Decreasing the pressure

    asked by Sarah foster
  44. Chemistry

    Any student is welcome to use this for extra practice and anyone is welcomed to amswed the question. Here is a couple of practice problems a) 2 N2O(g) + O2(g)  4 NO(g) B) H2(g) + CO2(g)  H2O(g) + CO(g) C) 4 HCl(g) + O2(g)  2 Cl2(g) + 2

    asked by Cole williams
  45. math

    I watched 1000 ants build an anthill in 5 hours. Working at the same rate, 2500 ants could have built the anthill in ? hours? A. 1 B. 2 C. 3 D. 4 I made a proportion of 1000/5=2500/x, and got 12.5, but that's not a choice. HELPS!

    asked by Ryan
  46. physics

    In Example 5.8 in the text book, we investigated the apparent weight of a fish in an elevator. Now consider a 72.0 kg man standing on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.20 m/s in 0.80

    asked by sacrevman
  47. Administrative Office Procedures

    If you have several calls coming in at one time, you should: A. ask someone else to help you. B. answer each call as soon as possible, saying, "Good Morning, Mr. Smith's office, will you hold, please?" C. handle one call at a time. D. answer each call by

    asked by Anonymous
  48. College Algebra

    4 + 5^6x = 8 (a) Find the exact solution of the exponential equation in terms of logarithms. x = (b) Use a calculator to find an approximation to the solution rounded to six decimal places. x = can any body help me out here please?

    asked by Melany
  49. pre-cal

    Change of Base Formula logb x = loga x/loga b to evaluate log14 41. (Round your answer to three decimal places.) i need a step by step preview please

    asked by Emma
  50. math

    Solve using suitable property [name the property] 1]428 x[-23]+[-428]x(-223) 2] 105 x(-37)

    asked by Raina
  51. english

    . A sinking fund is the accumulated amount to be realized at some future date (the end of the term) when a fixed number of periodic payments are paid into an account earning interest at the rate of i per period

    asked by lashay
  52. maths

    decimals, exponent

    asked by rajshree singh
  53. Algebra

    Solve the exponential by expressing each side as a power of the same base and then equating exponents. 5^x-2/4=squaroots 5 please help. Thanks!

    asked by Valentina
  54. Filidi senior secondary school

    Please analyse the following statement "The media do not tell us what to think but they tell us what to think about ".

    asked by siduduzo
  55. history

    the war powers resolution is possibly unconstituional because of what

    asked by stacy
  56. NURSING ASAP

    Is nursing considered a a science major because I'm taking this course called "CHEM 1001 Chemistry and the World Around Us?" and I studying nursing in college. Please be honest. Thank you! :)

    asked by Sam
  57. math

    A received 44 more votes than B there were a total of 550 votes / 2 candidates how many votes did each receive write an equation where b received how many votes

    asked by jerry piester
  58. Math

    The supplement of an angle measures 11 times its complement. Then the measure of the angle is... A. 9 degrees B. 81 degrees C. 90 degrees D. 99 degrees E. 100 degrees

    asked by Michelle
  59. Urgent chemistry

    Given the following reaction: 3 H2(g) + N2(g) 2NH3(g) + heat If the following changes were to occur what direction shift will it have (left or right) And what will be the reason of the shift Changes/Stress on system: Decreasing the pressure Adding heat

    asked by Nathaly hernandez
  60. Life orientation

    What is the following statement mean? In terms of media. "media do not tell us what to think but they tell us what to think about"

    asked by Anonymous
  61. math

    3^200/3^50 a. 4 b. 150 c. 3^4 d. 3^150

    asked by Anonymous
  62. Algebra

    5(a - 7) + 7= 2(a - 5) 5a -2a= 3a 14 - 5 = 9 Am I doing it right? a = 27

    asked by Dee365
  63. accounting

    A doctor's office paid $18,000 on insurance for a full year. What will be the balance of the prepaid expense after 8 months?

    asked by delmara
  64. english

    How can animated jungle animals, sea creatures, fairies, cars and other non-human characters can be used to represent race?

    asked by eric
  65. math

    WHAT ARE THE QUESTION IN BUSMATH?

    asked by tan
  66. Differential Equations

    Solve x(dy/dx)=(y^2)/(1-y log x).

    asked by Ranajoy
  67. Math

    Suppose that a certain material has a half life of 25 years, and there are A(t)=10(1/2)^t/25 grams remaining after t years. find: i) initial amount i) Amount after 80 years Solutions i) A(0)=10(1/2)^(0/25) =10(1/2)^0 =10(1) =10 ii)A(80)=10(1/2)^(80/25)

    asked by Aron
  68. ENN103F

    How can animated jungle animals, sea creatures, fairies, cars and other non-human characters can be used to represent race

    asked by Mandisa
  69. physics

    In a gas two waves of length 1m and 1.10m have a frequency difference of 10/3 Hz, the velocity of sound is ? a) 166m/s b) 332m/s c) 83m/s d) 336.7m/s

    asked by Muqadas
  70. English

    Is a clause a part of speech? My answer is no.

    asked by Steve
  71. kgothala s school life orintation

    meaning of campain with responsibility

    asked by nomthandazo mgaga
  72. probability

    the set s={x|x2+4x-5=0}

    asked by saman
  73. math

    If a line whose x- and y- intercepts are equal does not pass through the origin, then its slope must be A. 0 B. 1 C. -1 D. undefined I'm thinking it's 0, I don't know though.

    asked by Ryan
  74. math

    The result of adding a number to itself is usually unequal to the result of multiplying the number by itself. For how many different numbers are these results equal? A none B. one C. two D. four

    asked by Ryan
  75. Chemistry

    1)During an endothermic reaction, total energy A. decreases. B. increases. C. stays the same. D. cannot be determined. 2)The enthalpy of formation of an element is A. negative. B. positive. C. zero. D. negative or positive, depending on which element. i

    asked by Anonymous
  76. math

    If a line whose x- and y- intercepts are equal does not pass through the origin, then its slope must be A. 0 B. 1 C. -1 D. undefined I'm thinking it's 0, I don't know though.

    asked by Ryan
  77. ENN 103F

    HOW CAN ANIMATED JUNGLE ANIMALS, SEA CREATURES, FAIRIES, CARS AND OTHER NON-HUMAN CHARACTERS BE USED TO REPRESENT RACE?

    asked by tshepo rakereng
  78. ENN 103F

    explain dr charles da costa's theory on racial stereotyping

    asked by tshepo rakereng
  79. chemistry

    Please tell me any website....where I can find details of the experiment Reaction of 4-aminotoluene and o-vanillin(for preparation of azomethine)

    asked by Edward
  80. math algebra

    At your local bar, chicken wings cost $0.30 a piece on Thursday night. Sriacha Ranch dressing (enough for 10 wings), cost $0.10 per serving. A pitcher of of ice tea cost $7.50 and a serving of celery cost $2.50 . Tax in your part of LA County is 8.5% and

    asked by Justin