Questions Asked on
March 15, 2015

  1. Physics

    You have a solution that contains Ca2+ ions and another that contains Na+ ions. How would adding a solution that contains CO2-3 ions enable you to tell which is which?

    asked by Channing
  2. physics

    A 55 grams copper calorimeter contains an unknown mass of water at 18 degrees celcius. When 755 grams of alloy at 100 degrees celcius is dropped into the calorimeter ,the resulting temperature is 20.4 degrees celcius. Determine the mass of water.

    asked by john ralph
  3. Algebra

    Solve for x: (x-a)/b +(x-b)/a = b/(x-a) +a/(x-b)

    asked by Fred Rand
  4. Calculus

    A conical tank has a height that is always 3 times its radius. If water is leaving the tank at the rate of 50 cubic feet per minute, how fast if the water level falling in feet per minute when the water is 3 feet high? Volume of a cone is V=1/3(pi)r^2h A.

    asked by Anonymous
  5. Chemistry

    Ammonium nitrate (NH4NO3) is an important agricultural industrial chemical as it provides readily available nitrogen for plant growth, and one can buy 50. pounds of ammonium nitrate for $38. Urea (CO(NH2)2) is an attractive alternative, and, not being a

    asked by Val22
  6. biology

    Hello, I am having trouble with a question on my homework. Even after reading through my notes and textbook I am still not sure what the answer is. I think the answer is the new paramecium is able to reproduce sexually and asexually.Here is the question:

    asked by Jordan
  7. Physcis

    You are traeling back and forth on a 10m straight lane. You go forth in 10 sec and back in 4 seconds,forwards again in 5 s and back again in 1 seconds. what is ur displacement. and what is your average speed

    asked by Yes
  8. math

    A farmer has 100metres of fencing from which to build a rectangular chicken run. He intends to use two adjancent walls for two sides of the rectangular enclosure. Determine a formular for the enclosed area in terms of X?

    asked by Anonymous
  9. computer studies

    Explain modelling molecules..please?

    asked by shane
  10. science

    What is the mass of air in a room meauring 30 cubic meters if the density of air is 1.3kg per cubic meter?

    asked by shane
  11. GEOMETRY

    Two circles with radii a and b touch each other externally . Let c be the radius of a circle which touches these two circles as well as their common tangent to the two circles . Then relate a,b and c through an equation

    asked by PRANAV
  12. Algebra

    Please check my answer and let me know if it is right or not. 25+.32m(800)=281 28+.30(400)=148 70+40+2(30+.29)=830 +.29m

    asked by Jennifer
  13. PHYSICS

    The gravitational forces of the Earth and the Moon are attractive, so there must be a point on a line joining their centers where the gravitational forces on an object cancel. How far is this distance from the Earth's center?

    asked by Physics
  14. Social study

    how can we find place on a map

    asked by Noor
  15. chemistry

    CaSiO3(s) +6 HF (g)-> CaF2(aq) + SiF4 (g) + 3 H2O(l) If a 65.6 g sample of CaSiO3 is reacted in an inert 83 L container at 25.5°C with HF at 1.00 atm pressure find the following. a. the mass of water, and CaF2 produced in the reaction and the mass of HF

    asked by Val22
  16. History

    What is the difference between little p Progressivism and big P progressivism?

    asked by TayB
  17. physics 10

    1.) 100 kJ of heat is added to 600g of zinc at 20 C and 75g of it melts. If the specific heat of zinc is 0.385 kJ/kg-C and it melts at 420 C. What is its heat of fusion? 2.) If all the heat lost by 1kg of water at 0 C when it turns into ice at 0 C could be

    asked by ella
  18. Maths

    In a class of 39 pupils, 1/4 of the girls wear spectacles and 2/3 of the boys wear spectacles. A total of 16 pupils in the class wear spectacles. How many girls do not wear spectacles? Answer preferably in model method please.

    asked by Vincent
  19. english

    'to claim exemption' means? I think it means to ask for or to claim for privilege Am i right?

    asked by zoha
  20. Calculus

    If the limit as x approaches infinity (6x^2/200-4x-kx^2)=1/2, then k= A. 3 B. -3 C. 12 D. -12 E. -3

    asked by Anonymous
  21. Calculus

    If y=3x-7, x is greater than 0, what is the minimum product of x^2y? A. -5.646 B. 0 C. 1.556 D. 2.813 E. 4.841

    asked by Anonymous
  22. math

    In a class of 30 students,18 study Geography 3 take neither a) Display this information in a venn Diagram?

    asked by Larivita John
  23. Account

    Howie Stars produces starts for elementary teachers to reward their students. Howie Stars' trial balance on June 1 follows "HOWIE STARS Trial Balance June 1, 2012" Balance Account Title Debit Credit Cash $14,000 Accounts receivable 155,000 Inventories:

    asked by Shraddhya Dubey
  24. Maths

    There are 50 students in a class of which 40 are boys and the rest are girls the average weight of the class is 44kg and the averageweight of the girls us 40kg. find the average wieght of the boys

    asked by priya
  25. Science

    A dicot seed is preferred over a monocot seed to observe seed structure because? a.Distinct embryonic axis or b.Proper sepration of cotyldeons

    asked by Mona
  26. math

    If the point (a,0) and (0,b) and (1,1) lie on the same line, prove that 1/a + 1/b=1

    asked by saurav
  27. physics

    The system is frictionless and the trolley accelerates to the left at 3m/s squared. (a) calculate the unknown mass M. (b) calculate the magnitude of the forces in each string.

    asked by kulani
  28. Physics

    Two horizontal forces Upper F1 Baseline and F2 act on a 3.6 kg disk that slides over frictionless ice, on which an xy coordinate system is laid out. Force F1 is in the positive x direction and has a magnitude of 7.1 N. Force F2 has a magnitude of 9.3 N.

    asked by patrick
  29. math

    p and q are two points on the line x - y + 1 = 0 such that each of them is 5 units far from the origin. Find the co-ordinates of the points

    asked by saurav
  30. Calculus

    Given the function f(x)= sqrtx a) Let M= f´´(50) and N=f''(49). Argue on that f´´(x) lies between M og N if x =]49,50[ (Tip: show that f´´(x) is increasing function, that is look at f´´´(x)). b) Use the numbers from parta a) and define K as the

    asked by Calculus
  31. History

    What is the difference between little p Progressivism and big P progressivism?

    asked by Tay B
  32. maths

    an equilateral triangle is inscribed in a circle of radius 40cm. what is the length of the sides of the triangle

    asked by neevetha
  33. Math - Equations

    Just learned equations and want to know if i am doing write.. 4y= 2x-2 2y=2x6 ans (-7,-4) x+2y=7 3x-2y= -11

    asked by Marie
  34. Calculus

    The integral of sqrt(x)(sqrt(x)+1) dx A. 2(x^3/2+x)+c B. x^2/2+x+c C. 1/2(sqrt(x)+1)^2+c D. x^2/2+2x^3/2/3+c E. x+2sqrt(x)+c

    asked by Anonymous
  35. MATH EQUATIONS

    Just learned equations and want to know if i am doing right 4 problems. 4y= 2x-2 2y=2x6 ans (-7,-4) x+2y=7 3x-2y= -11 ans (-1,4) 4x-3y= -20 5x-7y= -64 ans (4,12) 2x-5y=-1 3x+2y=8 ans (2,1)

    asked by Marie
  36. Calculus

    If f(x) is a continuous function with f"(x)=-5x^2(2x-1)^2(3x+1)^3 , find the set of values for x for which f(x) has an inflection point. A. {0,-1/3,1/2} B. {-1/3,1/2} C. {-1/3} D. {1/2} E. No inflection points

    asked by Anonymous
  37. Calculus check

    Find the equation of the line tangent to y=tan2x at x=pi/8 A. y-1=sqrt(2)(x-pi/8) B. y-1=1/2(x-pi/8) C. y-1=1/4(x-pi/8) D. y-1=2(x-pi/8) E. y-1=4(x-pi/8) I got A

    asked by Sarah
  38. Chem

    Silver nitrate and aluminum chloride react with each other by exchanging anions as shown below. 3 AgNO3 (aq)+ AlCl3 (aq) → Al(NO3)3 (aq) + 3 AgCl (s) How many moles of AgCl is produced when 1 mol of AgNO3 reacts with 1 mol of AlCl3?

    asked by Anonymous
  39. 12th Grade

    What career can I study if I am doing this subject: Mathamatical literacy ,Accounting , Economics And Business studies anyone who can help?

    asked by matshidiso
  40. science

    Describe what happens to the electricity produced at 25kV by a power station when its transmitted to a house at 230 V many miles away.

    asked by sabrina
  41. World history

    "It was a town of red brick, or of brick that would have been red if the smoke and ashes had allowed it; but as matters stood, it was a town of unnatural red and black like the painted face of a savage. It was a town of machinery and tall chimneys, out of

    asked by Anonymous
  42. physics

    A 450 kg car traveling north at 30 m/s collides with a 560 kg car traveling west at 35 m/s. If after the collision they become entangled and move off together, (a) what is magnitude of the final momentum of the cars? (b) What is their final speed of the

    asked by John
  43. English help

    In Star Wars: a new hope when did a father-son(uncle) experience separation?

    asked by Anonymous
  44. math

    The concentration (in milligrams per liter) of an antibiotic in the blood is given by the geometric series A + Aekt + Ae2kt + + Ae(n − 1)kt where A is the number of milligrams in one dose of the antibiotic, n is the number of doses, t is the time between

    asked by Alexis
  45. Probation and Parole

    2) According to psychoanalytic theory: A. behavior is the result of operant conditioning. B. crime is the result of positive reinforcement. C. conscious behavior is the result of unconscious thought. D. all of the above I'm stuck and need help!!! I believe

    asked by breeamberr
  46. Science Help

    A projectile is launched at 15 degrees and it's landing height is the same as the launch position. If this is true, then at what other angle can the projectile be launch to achieve the same horizontal displacement?

    asked by Steffi
  47. chemistry

    CaSiO3(s) +6 HF (g)-> CaF2(aq) + SiF4 (g) + 3 H2O(l) If a 65.6 g sample of CaSiO3 is reacted in an inert 83 L container at 25.5°C with HF at 1.00 atm pressure find the following. a. the mass of water, and CaF2 produced in the reaction and the mass of HF

    asked by joe
  48. math

    from the top of a light house 40 m above the water the angle of depression of a small boat is 60 degree .find how far the boat is from the base of the light house

    asked by shaikha
  49. math

    area of a sector of a circle of radius 36 cm is 54 pie cm square . find the length of the corresponding arc of the sector

    asked by shaikha
  50. Please check my Calculus

    f(x)=x^n , where n is a positive integer greater or equal to 2. The graph of f(x) will have an inflection point when n is A. Even B. Odd C. Divisible by 3 D. For all values E. For no values I got B.

    asked by Anonymous
  51. Chemistry

    What will happen to the number of moles of SO3 in equilibrium with SO2 and O2 in the following reaction in each of the following cases? 2 SO3(g) equilibrium reaction arrow 2 SO2(g) + O2(g) ΔH° = 197 kJ (a) Oxygen gas is removed. increase decrease stay

    asked by Sally
  52. Biuret & Lowry Method

    Hello I want to ask several questions about Lowry and Biuret method. 1. Lowry Reagent C are prepared freshly. Why? 2. Why Folin Reagent kept in dark bottle? 3. Order of addition of reagent is important for preparing Lowry Reagent C. Why? 4. We prepare

    asked by Angora
  53. algebra

    if x =3x then evaluate 8x squared +4x

    asked by tlhompo
  54. physics electromagnetism

    Two long parallel vertical wires 0.3m apart are. ' placed east-west of one another. The current in the westerly wire is 30A and on the other 20A. The horizontal component of the earths magnetic flux density is 2*10^-5. Find the force per unit length on

    asked by pascal
  55. Calculus

    If f'(x)=sinx and f(pi)=3, then f(x)= A. Cosx+4 B. Cosx+3 C. -cosx+2 D. -cosx-2 E. -cosx+4

    asked by Anonymous
  56. calculus

    What is the limit, as x approaches 1, of (sqrt(x) - 1)/(x - 1)? I need to show work, but I know the answer is 3/2, because I confirmed with a TI-89.

    asked by John
  57. Calculus check

    The limit as x approaches 1 (x^3-1)/(x^2-1) is I got 3/2

    asked by Sarah
  58. physics/chem

    Okay so I want to solve for refractive index. I'm given the dielectric constant and the permeability M. From what I understand the refractive index is frequency dependent. I'm just unsure what equation to use. n=(Er)^1/2 does not work because the

    asked by Zed
  59. English Literature

    I read William G Mcloughlin's essay "Pietism and the American Character" and I didn t understand anything I need a brief summary of the main ideas

    asked by John
  60. Calculus

    Let f be a function such that the limit as h approaches 0 [(f(5+h)-f(5))/h]=4. Which of the following must be true? I. f(5)=4 II. f'(5)=4 III. f is continuous at x=5 A. I only B. II only C. III only D. I and II only E. II and III only

    asked by Anonymous
  61. Calculus check

    The smallest slope of f(x)=6x^2-x^3 for 0 is less than or equal to x is less than or equal to 6 occurs at x= A. 0 B. 2 C. 3 D. 4 E. 6 I got E

    asked by Sarah
  62. biochem

    How would I calculate blood glucose levels if using standard curve ...and I have three samples and their absorbence at 420 nm.

    asked by em
  63. Language arts

    What's third person point of view?

    asked by My name :)
  64. Calculus check

    An equation of the line tangent to y=sinx+2cosx at (pi/2, 1) is A. 2x-y=pi-1 B. 2x+y=pi+1 C. 2x-2y=2-pi D. 4x+2y=2-pi I got A

    asked by Sarah
  65. science

    air masses that form over land are moist true or false

    asked by rezene
  66. Calculus

    For f(x)=x^2/3(x^2-4) on [-2,2] the "c" value that satisfies the Rolle's Theorem is A. 0 B. 2 C. +or-2 D. There is no value for c because f(0) does not exist E. There is no value for c because f(x) is not differentiable on (-2,2)

    asked by Anonymous
  67. calculus

    The graph of the function y=x^5-x^2+sinx has a point of inflection at x= a. 0.324 b. 0.499 c. 0.506 d. 0.611 e. 0.704 Thanks.

    asked by John
  68. math

    Two cylindrical containers are similar. The larger one has internal cross- section area of 45cm^2 and can hold 0.945 litres of liquid when full. The smaller container has internal cross- section area of 20cm^2. (a) Calculate the capacity of the smaller

    asked by kudu
  69. AP CALC

    1. Let f be a twice-differentiable function such that f (2) = 8 and f (4) = 5. Which of the following must be true for the function f on the interval 2 ≤ x ≤ 4. I. The average value of f is 6.5 II. The average rate of change of f is -1.5 III. The

    asked by Rachel
  70. Chemistry

    Calculate the pH during the titration of 10.00 mL of 0.400 M hypochlorous acid with 0.500 M NaOH. The Ka for HOCl is 3.0 x 10-8 M. What is the pH at the equivalence point? I used the HH formula and got pH=7.52+log(.222)=6.87, but its not right.

    asked by JUNDY
  71. chemistry

    An aqueous solution contains 64g of ethanol( C2H5OH) in 122 grams of solution. The mole fraction of ethanol is:

    asked by anon
  72. Chemistry

    Calculate the pH during the titration of 10.00 mL of 0.400 M hypochlorous acid with 0.500 M NaOH. The Ka for HOCl is 3.0 x 10-8 M. What is the pH when half the acid has been neutralized? 'I got 7.82 by using the HH formula but its wrong, help.

    asked by JUNDY
  73. math

    A cord AB of length 4cm divides a circle of radius 3.3cm into two segments.find the area of each segment.

    asked by michelle
  74. Calculus check

    Given f(x)=x^4(2x^2-15). On what interval(s) is the graph of f concave upwards? A. (0, sqrt(3)) B. (-sqrt(3), 0) C. (-sqrt(3), 0) and (0, sqrt(3)) D. (-sqrt(3), sqrt(3)) E. (Negative infinity, -sqrt(3)) and (sqrt(3), infinity) I got E

    asked by Sarah
  75. math

    An arc AB of length 5cm is marked an a circle of radius 3cm. Find the area of the sector bounded by this arc and the radii from A and B.

    asked by michelle
  76. Please check my calculus

    If x^2+xy-y=2, find dy/dx My answer: (2x+y)/(1-x)

    asked by Anonymous
  77. math

    Asha, Nangila and Cherop contributed shilling 60,000,shilling 85,000 and shilling 105 000 respectively. They agreed to put 25% of the profit back into business each year. They also agreed to put aside 40% of the remaining profit to cater for taxes and

    asked by kudu
  78. math

    A square brass plate is 2 mm thick and has a mass of 1.05 kg. The density of the brass is 8.4 g/cm3. Calculate the length of the plate in centimeters.

    asked by kudu
  79. accounting

    A compound transaction was recorded as follows: debit Equipment, $5,000; debit Cash, $1500; credit Accounts Payable, $3,500. This error would cause __________. A. assets to be overstated B. assets to be understated C. liabilities to be overstated D.

    asked by Josh
  80. Math

    If the standard error of measurement is 3, and a person scores 125, Standard error of measurement with one standard deviation would put the score at ____?

    asked by Bill
  81. Financial

    If a corporation pays a dividend, which group receives priority in receiving the dividend? bond holders holders of common stock holders of preferred stock dividends are evenly divided by holders of common and preferred stock

    asked by Saline
  82. Physics

    An F-18 with a weight of 22500 lbs lands on a carrier with a speed of 120 mph. If the run-out of the arresting cable is 160 ft, what is the planes acceleration in feet per second squared?

    asked by Jim
  83. precal

    demoivre theorem (2sqrt3+2i)^5 r=(2sqrt3+2)^2

    asked by LK
  84. physics

    At the beginning of a new school term, a student moves a box of books by attaching a rope to the box and pulling with a force of F = 88.9 N at an angle of 56◦ , as shown in the figure. The acceleration of gravity is 9.8 m/s 2 . The box of books has a

    asked by Liz
  85. Calculus check

    Let f(x) be a polynomial function such that f(3)=3, f'(3)=0 and f"(3)=-3. What is the point (3,3) on the graph y=f(x)? A. Relative maximum B. Relative minimum C. Intercept D. Inflection point E. None of these I got C

    asked by Sarah
  86. chemistry

    H2(g)+ o2(g)-> H20(l) (delta)Hf(h20(l)=-286 kj/mol the total volume of hydrogen needed fill the hindenberg was 2.3 x 15^5 m^3. what is the theoretical yield of heat (that which could have been evolved) when the hindenberg exploded, assuming all the

    asked by Jack
  87. chemistry

    Suppose a reaction has the equilibrium constant K = 2.3 10-7 at a particular temperature. Will there be a large or small amount of unreacted starting material present when this reaction reaches equilibrium? a)There will be a small amount of unreacted

    asked by andy
  88. Math

    Which of the following is true about a trend line for data? A. The minimum data point always lies on the trend line. B. Every data point must lie on the trend line. C. The trend line describes the pattern in the data if one exits. D. The trend line

    asked by Anonymous
  89. precal

    sqrt2/2^2

    asked by LK
  90. math

    A cell phone company charges by the minute (and partial minute) for a phone call. Arionna’s plan includes 300 minutes in the $20 base cost. If she uses more than 300 minutes, there is a $5 overage fee and an additional charge of $0.25 per minute. Which

    asked by Anonymous
  91. FINANCE

    Below is a list of account balances for Currie Hospital as of December 31, 2013. Prepare a balance sheet as of December 31, 2013, in proper form. (Hint: You will need to compute the net assets account. Assume that all net assets at the beginning of the

    asked by JON
  92. Math Geometry - Please check my answers!

    There's a line graph with 3 dolphins (it's the same dolphin at different spot of the jump) jumping out of the water and landing (they formed a parabola). The Y-axis represents Height in feet and the X-axis represents Time in Seconds. The points are (10,0),

    asked by Lilly
  93. chem

    Calculate glucose levels using standard curve when you have absorbence for sample

    asked by em
  94. SPanish

    In the spaces provided, write the vocabulary expression that could replace the underlined words in each sentence without significantly changing the meaning of the sentence. Do not use any of the underlined words again. ¿Viste el artículo en el periódico

    asked by Ciaria
  95. chemistry

    a) calculate the concentration of your unknown (Gatorade) using correct units Note if you did not run the Gatorade use absorbance =0.205 abs units in order to calculate the concentration of the dye in the Gatorade b) calculate of % T for an absorbance of

    asked by mathew
  96. precal

    demoivre theorem (2-2i)^8

    asked by LK
  97. Physic

    1. Evaluate dF/dr when r=10,000, given that F= GmM/(r^2) and that F decreases by 3N/m when r=20,000. 2. The lowest point of a 5 meter long ladder is pulled away from a wall at 0.3 meters/sec. Find the rate at which the angle between the ladder and the wall

    asked by Anonymous
  98. Calc

    Find the derivative of: 1. Xlog base e (log base e X) 2. log base x 7 3. (sinh x)^2 - (cosh x)^2

    asked by Anonymous
  99. math

    Two cylindrical containers are similar. The larger one has internal cross- section area of 45cm^2 and can hold 0.945 litres of liquid when full. The smaller container has internal cross- section area of 20cm^2. (a) Calculate the capacity of the smaller

    asked by kudu
  100. calculus

    1.) Find the derivative of ((x + 3)/e^x) ^ (Log e X) 2.) T/F (log e X)' = (log e |x|)' 3.) T/F (Log e 7x)' = (log e x)' 4.) Find the derivative of e^(log e 7x)

    asked by Alex
  101. math

    How do I write one equations in slope-intercept form, and three other lines in slope-intercept form that are perpendicular to the first line ?? Please Help, Thank you =)

    asked by may
  102. Algebra

    If an angle, x, is in standard position, and P(-3, 4) is a point on the terminal side of the angle, what is the value of sin x?

    asked by Jack
  103. calculus check

    If siny=cosx, then find dy/dx at the point (pi/2, pi) A. -1 B. 0 C. 1 D. pi/2 E. None of these I got C

    asked by Sarah
  104. algebra

    Yoko runs 3 miles in 25 minutes. At the same rate, how many miles would she run in 20 minutes?

    asked by kay
  105. Please check my calculus

    A conical tank has a height that is always 3 times its radius. If water is leaving the tank at the rate of 50 cubic feet per minute, how fast if the water level falling in feet per minute when the water is 3 feet high? Volume of a cone is V=1/3(pi)r^2h A.

    asked by Anonymous
  106. physics/chemistry

    Okay so I want to solve for refractive index. I'm given the dielectric constant and the permeability M. From what I understand the refractive index is frequency dependent. I'm just unsure what equation to use. n=(Er)^1/2 does not work because the

    asked by Zed
  107. math

    18 students in the class play baseball.17 students play basketball. 30 students play either or both. select the venn diagram that shows the number who play baseball and basketball?

    asked by karia
  108. Programming in Java

    Write a program to calculate adjacent and opposite of a triangle. My code can calculate hypotenuse but won't calculate opposite and adjacent.

    asked by Excel
  109. math

    A straight line passes through the point (-1,2) and its distance from the origin is 1 unit. Find the equation

    asked by saurav
  110. Algebra

    Name the property of real numbers illustrated by the equation. -4(x + 3) = -4x - 12 A. Associative Property of Multiplication B. Associative Property of Addition C. Distributive Property D. Commutative Property of Addition B or A ? I think its B

    asked by Ciaria
  111. Calculus check

    A function f(x) is continuous for all x and has a local minimum at (1,8). Which must be true? A. f'(1)=0 B. f' exists at x=1 C. The graph is concave up at x=1 D. f'(x) is less than 0 if x is less than 1, f'(x) is greater than 0 if x is greater than 1 E.

    asked by Anonymous
  112. english

    how to unscramble letters to find name of country : 1. NLCIGSAD 2. NNSHOADE

    asked by danesh
  113. Calculus

    For how many values of x will the tangent lines to y=4sinx and y=x^2/2 be parallel? A. 0 B. 1 C. 3 D. 4 E. Infinite Thanks.

    asked by Anonymous
  114. physics

    Calculate the gauge pressure inside a soap bubble 0.0002m in radius using the surface tension for soapy water

    asked by Boyd
  115. English

    1. There were 40 seats for older children in the front and benches for little children at the back. 2. There were 40 seats for older children at the front and benches for little children in the back. -------------------------------------- Which preposition

    asked by rfvv
  116. English

    1. I'm very happy because I can go to school and study now. 2. I'm very happy that I can go to school and study now. 3. I'm very happy I can go to school and study now. -------------- Are both the same in meaning? Which one is popular, 'because' or 'that'?

    asked by rfvv
  117. Algebra

    Is the inequality below sometimes, always, or never true? -2(2x + 9) > -4x + 9 A. always B. sometimes C. never C ?

    asked by Ciaria
  118. Calculus 2 Trigonometric Substitution

    I'm working this problem: ∫ [1-tan^2 (x)] / [sec^2 (x)] dx ∫(1/secx)-[(sin^2x/cos^2x)/(1/cosx) ∫cosx-sinx(sinx/cosx) ∫cosx-∫sin^2(x)/cosx sinx-∫(1-cos^2(x))/cosx sinx-∫(1/cosx)-cosx sinx-∫secx-∫cosx sinx-sinx-∫secx =-ln |secxtanx|+C Can

    asked by Janice
  119. MATH

    Suppose that 3% of all adults suffer from diabetes and that 29% of all adults are obese. Suppose also that 2% of all adults both are obese and suffer from diabetes. (a)Find the probability that a randomly chosen adult is obese, given that he or she suffers

    asked by Anonymous
  120. math

    Two towns P and Q are 400 km apart. A bus left for P and Q. It stopped at Q for one hour and then started the return to P. one hour after the departure of the bus from P, a trail also heading for Q left P. the trailer met the returning bus ¾ of the way

    asked by kudu
  121. Algebra

    the perimeter of a rectangle is 62 m. The length is four more than two times the width. What is the length?

    asked by Nicko
  122. chemistry

    hi I have a hard time understanding the following question: The

    asked by juju
  123. Chemistry

    Concentrated hydrochloric acid is 38% HCl by weight and has a density of 1.19 g/mL. A solution is prepared by measuring 70 mL of the concentrated HCl, adding it to water, and diluting to 0.500 L. Calculate the approximate molarity of this solution from the

    asked by JUNDY
  124. math

    In the year 2003, the population of a certain district was 1.8 million. Thirty percent of the population was in the age group 15-40 years. In the same year, 120,000 people in the district the Voluntary Counseling and Testing (VCT) contra for an HIV test.

    asked by kudu
  125. Early Childhood Education

    Lesson Plan for 3 year olds: See If I am doing it correctly. Goal: To teach how to recognize the first and last letter of their names. Objective: The children will identify and name the first and last letter of their names. Standards Include: Georgia Early

    asked by Barbara
  126. math

    David bought a new car for shilling 800,000. After 5 years, he sold it through a second-hand car dealer. The dealer charged a commission of 4% for the sale of the car. If David received shilling 480,000, calculate the annual rate of depreciation of the

    asked by kudu
  127. Chemistry

    Calculate the pH during the titration of 10.00 mL of 0.400 M hypochlorous acid with 0.500 M NaOH. The Ka for HOCl is 3.0 x 10-8 M. What is the pH when half the acid has been neutralized? 'I got 7.82 by using the HH formula but its wrong, help.

    asked by JUNDY
  128. Chemistry

    Calculate the pH during the titration of 10.00 mL of 0.400 M hypochlorous acid with 0.500 M NaOH. The Ka for HOCl is 3.0 x 10-8 M. What is the pH at the equivalence point? I used the HH formula and got pH=7.52+log(.222)=6.87, but its not right.

    asked by JUNDY
  129. Algebra

    1. Solve log(4/x) (x^2 - 6) = 2. (note: the (4/x) is underscored) 2. Show that loga [(x + {sqrtx^2-5}) / 5] = -loga (x - (sqrtx^2-5))

    asked by Lily
  130. precal

    how do you use demoivre theorem for (-1+i)^7

    asked by LK
  131. Math

    Name all the quadrilaterals that have two pairs of parallel sides and all angles congruent

    asked by Darion
  132. 1 History Question

    How did the War Production Board play a role in coordinating American war efforts during World War II? It was the government agency that worked with corporations to produce what the military needed. It was the agency that determined when and where troops

    asked by Lia
  133. trig

    A gear with a radius of 32 centimeters is turning at pi/9 radians/sec. What is the linear speed (velocity) at a point on the outer edge of the gear?

    asked by Chris
  134. math

    The apocalypse started in NY where 100 people were infected. From there the zombie apocalypse continued to spread. After 17 minutes the number of people infected 200 people.assume that no human have figured out how to kill the zombie or stop it from

    asked by tony
  135. Statistics

    in 2000, the averages change of tax preparation was $95. Assuming a normal distribution and a standard deviation of $10. What proportion of tax preparation fees were more than $95.

    asked by Leo Elvis
  136. LAST history question

    Why did the US government require rationing of some goods during World War 2? A. to provide food and supplies to war refugees in Europe B. to increase the demand for certain items to increase the profit made by selling them around the world C. to decrease

    asked by Lia
  137. Statistics

    the age of costumers for a particular retail store follows a normal distribution with a mean of 37.5 years and a standard deviation of 7.6 years. what is the probability that the next costumer who enters the store will be less than 42 years old?

    asked by Leo Elvis
  138. math

    write an equation of a circle with the given center and radius. center (–7 –3) and radius 13

    asked by jay
  139. Dynamics

    an 800 lb cannon fires a 5 lb cannonball in a horizontal direction. the cannon sits on a skid; the kinetic coefficient of friction between the skid and the horizontal surface is .25. if the cannonball has a speed of 650 ft/s when it leaves the cannon,

    asked by Matt
  140. business math 2

    If the demand equation for a particular commodity is y=28-5x, where y is the unit price in pesos and x is the quantity in units, find the total revenue function and marginal revenue function.

    asked by zela
  141. chemistry

    The power of the equation ΔG° = –RT ln(K) is that K can be determined from tabulated values of ΔG°f. Use the tabulated values of the Gibb's energy to determine K for the reaction, 2AB(l) ↔ 2A(g) + B2(g), at 298K. (R=8.314 J/K mol or R=0.008314 kJ/K

    asked by Carl
  142. business math

    marylin was supposed to pay $1460 to Bernice by March 2. Some time later Marylin paid Bernice an equivalent of $1552.84, allowing for a time value of money of 3.9% compounded monthly. When did marylin make the payment?

    asked by Ify
  143. chemistry

    Calculate how many grams of O2(g) can be produced from heating 31.8 grams of KClO3(s).

    asked by 7
  144. algebra

    Evaluate the expression for the given value of the variable(s). -x2 - 4x; x = –3 A. –17 B. 11 C. –1 D. 3 d ?

    asked by Ciaria
  145. life orientation

    compare in five ways the similaritie and differences between nfsas and other student loans.

    asked by nicholl
  146. algebra

    Insert , or = to make the sentence true. SQR3 SQR7 A. > B. < C. = C?

    asked by Ciaria
  147. Statistics

    The time it takes a technician to fix a computer problem is exponentially distributed with a mean of 15 minutes. what is the probability that a). it will take a technician less than 10 minutes to fix a computer problem? b) it will take a technician between

    asked by Leo Elvis
  148. algbera

    What is the corresponding temp in 77 degrees Fahrenheit to degrees celsio us

    asked by Anonymous
  149. life orientation

    compare in five ways the similaritie and differences between nfsas and other loans.

    asked by nicholl
  150. math

    Samantha has five objects weighing 1kg,2kg,3kg,4kg and 5kg. If she weighs them two at a time, how many different weighs can she get?

    asked by karen
  151. life orientatiton

    three disadvantages for student to student to study at the institution of higher education through nfsas

    asked by nicholl
  152. life orientation

    the similarities and differences between funza lushaka and nfsas

    asked by nicholl