Questions Asked on
July 11, 2016

  1. Chemistry

    I may need this broken down step by step to understand this problem thanks. A 20.0% by mass solution of phosphoric acid (H3PO4) in water has a density of 1.114 g/ml at 20℃. What is the molarity of the solution?

    asked by Andrew J. DuBois
  2. chemistry

    When magnesium metal and an aqueous solution of hydrochloric acid combine, they produce an aqueous solution of magnesium chloride and hydrogen gas. Using the equation, Mg (s) + 2HCl (aq) Imported Asset MgCl2 (aq) + H2 (g), if 72.9 g of Mg and 146.0 g of

    asked by Anonymous
  3. Math

    Ivan finished 4/5 of his math homework problems and all 3 questions for his science homework before dinner . If he finished a total of 43 problems before dinner , what is the total number of math homework problems he was assigned?

    asked by Janeya
  4. pre cal

    Suppose the speed of sound is c, and gravity is g. If you throw a rock from an initial height h0 and with an initial velocity v0 the height h(t) of the rock after time t is h(t)=−g/2 t^2+v0 t+ h0. (The height is negative when the rock is below ground

    asked by ari
  5. Pre Calculus

    Find the exact value ofcos (u+v) given that sin u= 7/25 and cos v=−12/13. (Both u and v are in Quadrant II.)

    asked by Jessica Maths
  6. calculus

    Find the exact value of the given expression. (tan17pi/12 - tan pi/4) / (1+tan 17pi/12 tan pi/4) can you help with this? i got the answer 1/ squareroot 3

    asked by megan
  7. calculus

    The monthly sales S (in hundreds of units) of baseball equipment for an Internet sporting goods site are approximated by S = 60.1 − 43.9 cos πt/ 6 where t is the time (in months), with t = 1 corresponding to January. Determine the months when sales

    asked by megan
  8. chemistry

    QUESTION 10 Ammonia gas is formed from nitrogen gas and hydrogen gas according to the following equation: N2 (g) + 3H2 (g) Imported Asset 2NH3 (g). If 112 grams of nitrogen gas is allowed to react with an excess of hydrogen gas to produce 120 grams of

    asked by Anonymous
  9. Physics

    As shown in the figure below, a 2.25-kg block is released from rest on a ramp of height h. When the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch

    asked by Brionna
  10. chemistry

    QUESTION 11 Ammonia gas is formed from nitrogen gas and hydrogen gas, according to the following equation: N2 (g) + 3H2 (g) Imported Asset 2NH3 (g). If 84.0 g of nitrogen gas is allowed to react with an excess of hydrogen gas to produce 85.0 g of ammonia,

    asked by Anonymous
  11. math

    It has been observed that a particular plant's growth is directly proportional to time. It measured 2 cm when it arrived at the nursery ang 2.5 cm exactly one week later. If the plant continues to grow at this rate, determine the function that represents

    asked by Gennelle
  12. math

    Write the given expression as the tangent of an angle. tan 7x − tan x/ 1 + tan 7x tan x

    asked by terry
  13. Math

    The volume V of gas varies inversely as the pressure P on it. If the volume is 240 cm^3 under pressure of 30 kg/cm^2, what pressure has to be applied to have a volume of 160 cm^3 ?

    asked by Gennelle
  14. math

    Write the given expression as the cosine of an angle. cos 60° cos 65° − sin 60° sin 65°

    asked by terry
  15. chemistry

    When 4.2g of NaHCO3 is added to a solution of CH3COOH Weighing 10g, it is observed that 2.2g of co2 is realised into the atmosphere . The residue left is found to be 12g . Show that this observations are in agreement with the law of conservation of mass?

    asked by sid
  16. chemistry

    When magnesium metal and an aqueous solution of hydrochloric acid combine, they produce an aqueous solution of magnesium chloride and hydrogen gas. Using the equation, Mg (s) + 2HCl (aq) Imported Asset MgCl2 (aq) + H2 (g), if 72.9 g of Mg and 146.0 g of

    asked by Anonymous
  17. math help?!

    If x = 6sinθ, use trigonometric substitution to write square root 36-x^2 as a trigonometric function of θ, where where 0

    asked by sophie
  18. mathematics

    a class contains 15 boys and 21 girls.a student is chosen at random.what is the probability that a boy is chosen?

    asked by musa ezekiel
  19. Chemistry

    If a current of 3.00 A is applied to a cell containing a 400g copper anode, determine the final mass of the copper anode after the cell runs for 48.0h

    asked by Luke
  20. math

    A man buys a corporate bond from a bond brokerage house for $925. The bond has a face value of $1000 and a 4% coupon rate paid semiannually. if the bond will be paid off at the end of ten years, what rate of return will the man receive?

    asked by sheree
  21. statistics

    If P(A)=11/13, find P(Ā) Find the indicated probability

    asked by Anonymous
  22. math please help?! studying for test!!

    If x = 9tanθ, use trigonometric substitution to write square root 81 + x^2 as a trigonometric function of θ, where -pi/2 < θ < pi/2

    asked by sophie
  23. math

    Use a graphing utility to approximate the solutions (to three decimal places) of the given equation in the interval (-pi/2, pi/2) a. 1 b. –1 c. 1/2 d. 2 e. 0

    asked by megan
  24. algebra

    . On the reality TV show Last Man Standing, a package is thrown from a plane to the ocean below. The contestants must swim to the package to receive the “free pass” located inside the package. The path that the package follows can be modelled by the

    asked by k
  25. chemistry

    For combustion of 10 grams of C4H10 excess of O2, You are obtained 25 grams of CO2 according to the reaction (to balance): C4H10+ O2→ CO2+ H2O Calculate the reaction yield of the reaction. please,could anyone help me to solve this problem.

    asked by Anonymous
  26. Physics

    A ball is thrown horizontally from the building roof at a speed of 20 m/s. Takes ball 4 seconds to reach the ground. How tall is building? What is the ball’s speed and direction as it contacts the ground? How far from the base of the building does the

    asked by Bobby
  27. math

    Kyle opened a bank account with $450. He deposits $58.50 each week. Write a function that shows the amount he has after w weeks. What is the function.

    asked by kyle
  28. algebra 2

    16t^2 – 1/64 Explain in your own words what the meaning of domain is. Also, explain why a denominator cannot be zero. Find the domain for each of your two rational expressions. Write the domain of each rational expression in set notation (as demonstrated

    asked by peaches
  29. MATH

    REWRITE EQUATION W=EXP(2Y+8Z-3X) AS THE PRODUCT OF THREE TERMS

    asked by DANIELLE
  30. Pre-Cal:(Cont.)

    [Note: I've tried this problem 4 times already and still have it wrong. I know the steps to doing it but for some reason its wrong. an someone please help me get these answers for (b).] An equation is given. (Enter your answers as a comma-separated list.

    asked by Amber
  31. chemistry

    If chlorine and fluorine react according to the reaction (to balance): Cl2+ F2→ ClF3 And calculate the amount of product and of limiting reagent that remains, when 10 g of chlorine and 30 g of fluorine are reacted to give chlorine trifluoride.

    asked by Anonymous
  32. Chemistry

    If a solid state lithium battery produced 5.00 mA in 8.25 h, then the mass, in milligrams, of lithium consumed would be?

    asked by Luke
  33. Pre-Cal

    Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places where appropriate.) cos θ = −1/2 1).θ= Answer-->(2π/3)+2πn, 4π/3+2πn 2). List six specific solutions a). b). c). d).

    asked by Amber
  34. Pre-Cal

    An equation is given. (Enter your answers as a comma-separated list. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.) 2 cos 2θ − 1 = 0 a). Find all solutions of the equations answer--> θ= (π+6nπ)/6 ,

    asked by Amber
  35. MATH

    Rewrite equation w=exp(2y+8z-3x) as the product of three terms. note that writing exp(a) is the same as writing e^a

    asked by DANIELLE
  36. math

    Two mechanics worked on a car. The first mechanic worked for 5 hours, and the second mechanic worked for 15 hours. Together they charged a total of $2025 . What was the rate charged per hour by each mechanic if the sum of the two rates was $205 per hour

    asked by jazmine
  37. MATH

    A beautiful Princess is locked inside the Castle. A Moat 15 metres wide surrounds the Castle. A Knight is attempting to rescue the Princess but he only has two planks of wood, both 14.5 metres long. How can the brave Knight bridge the Moat and rescue the

    asked by Sandy
  38. calculus

    Find the exact value of the given expression using a sum or difference formula. sin 345° Can you help with this? I got 1/4 (squareroot 2 - square root 6)

    asked by megan
  39. Pre-Cal (Help Plz!)

    Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.) (tan^2θ-9)(2cosθ+1)=0 θ=__________________ I got

    asked by Amber
  40. Math - Transformations

    State the transformation for g(x) = -2 (2x - 4)³ - 1 Would it be a vertical stretch by a factor of 2 a reflection in the x-axis a horizontal stretch by a factor of 1/2 a translation 4 units right and 1 unit down Am i right?

    asked by Jen
  41. algebra 2

    x2 + 2x – 10/ 3x – 15 Explain in your own words what the meaning of domain is. Also, explain why a denominator cannot be zero. Find the domain for each of your two rational expressions. Write the domain of each rational expression in set notation (as

    asked by peaches
  42. Physics

    An object of area 15sqcm and height 2 cm has a mass of 50g. what is its density in SI system

    asked by Sherwin
  43. geometry

    Find the measure of one exterior angle of a regular polygon that has 21 sides. Round your answer to one decimal place. m∠exterior angle

    asked by Anonymous
  44. chemistry

    20g of NaHCO3 Treated with 22g of HCl Producing 12g of the residue. What is the amount of co2 Formed ?

    asked by sid
  45. Pre Calculus

    Multiply; then use fundamental identities to simplify the expression below and determine which of the following is not equivalent. (sin x + cos x) ^2 a. 1+2sinxcosx b. sec^2x−tan^2x+2cosxsinx c.sec x + 2 sin x/sec x d. sin^2x+cos^2x e. 1+2cos (pi / 2 -

    asked by Jessica Maths
  46. math

    Use a graphing utility to approximate the solutions (to three decimal places) of the given equation in the interval square bracket0, 2π) sin 2x + 1.5 cos x = 0 a. x = 1.624, 1.932, 5.776, 5.997 b. x = 1.055, 3.785, 4.652, 5.721 c. x = 1.101, 2.118, 3.982,

    asked by megan
  47. maths

    approximate the solutions (to three decimal places) of the given equation in the interval square bracket 0, 2π) sin 2x + 1.5 cos x = 0

    asked by megan
  48. math

    A theater group made appearances in two cities. The hotel charge before tax in the second city was $500 lower than in the first. The tax in the first city was 6%, and the tax in the second city was 4.5% The total hotel tax paid for the two cities was

    asked by jazmine
  49. History

    11. At the beginning of World War II, Roosevelt dealt with France A. by supporting the Free French under Charles de Gaulle. B. by joining with the British in an assault on North Africa. C. through negotiations with the Vichy Government. D. by seeking an

    asked by Nena
  50. Math

    Write the equation of a rational function in the form of 𝑓(𝑥) = 𝑎𝑥+𝑏/𝑐𝑥+𝑑 if the vertical asymptote is x =5, the horizontal asymptote is y=2, the x-intercept is (-1/2 , 0) and the y-intercept is (0,-1/5 ).

    asked by Squad
  51. Calculus

    Find the critical numbers of the function f(x)=2sinx+x that lie in the interval (0,2pi)? I have the answers, but not sure how to display the work.

    asked by Jace
  52. science

    what are some examples of a suspension? i need help!!!

    asked by jane
  53. math

    what number whose sum of its digit is 26 becomes 6000 when rounded to the nearest thousand.

    asked by Anonymous
  54. math

    the building supply store sells one liter bottles of water for $1.09 approximately how many 8 ounce servings of water in 1 liter

    asked by chris
  55. maths

    Use the cofunction identities to evaluate the expression below sin^2 21° + sin^2 61° + sin^2 69° + sin^2 29°

    asked by elise
  56. Math

    A polynomial function with a degree of 6 has the zeros of 𝑥 = 2 (order 2), 𝑥 = −1 (order 1) and 𝑥 = 5 (order 3). Write a general formula for a family of functions that share the same properties as this function. Please HELP!

    asked by Matt
  57. Research Methods

    Thinking of a survey you might design for a commercial client such as a software company or a restaurant, what are the ethical implications of using the survey results to publicize your own research firm? Looking forward to some ideas! Thanks!

    asked by Beth
  58. Math

    The function −2𝑓(2𝑥 + 4) − 1 has been transformed from the graph of 𝒇(𝒙) = 𝒙^𝟑 Write the equation for the transformed function.

    asked by Jen
  59. physics

    a 10k race was held the first place finisher completed the 10km run in 29.5 minutes what was the average speed in miles per hour. In another race the person is given a head start and if they beat the first place finisher at the end the win $2,500 the

    asked by glenn
  60. MATH

    SIMPLIFY THE FOLLOWING EXPRESSION: Z=LOG(E^5Y) i MOVED THE EXPONENT TO THE FRONT: Z=5YLOGE IS THIS CORRECT?

    asked by DANIELLE
  61. Math Please Help ASAP

    The function 𝑄(𝑥) has been transformed from the function 𝑓(𝑥) = 𝑥^4 . The mapping rule for the function can be written as (2𝑥 + 𝒄, 4𝑦 + 𝒃). If the coordinate(1/2 ,1/16) on the function 𝑓(𝑥) is transformed to (3,5) on Q(x),

    asked by Matt
  62. maths

    sum of the digits of a two digit no is 9 when we interchange the digit it is found that the resulting new no is less than the original by 9 what is the two digit no

    asked by priti
  63. math

    if a tax meter registers 20 pesos plus 5 pesos per kilometer covered. express the amount T registered in the taxi meter as a function of the number of kilometers covered

    asked by kyle
  64. Maths Year 10 Equations

    A shopkeeper bought x pens for $21. a) write down an expression, in terms of x, for the cost, in cents, of each pen b) the shopkeeper gave 2 pens to his sons and sold each of the remaining pens at 8 cents more than he paid for it. Write down an expression,

    asked by Patricia
  65. MPA

    Searches related to hOW PRICE DISCRIMINATION TEND TO MORE COMMON IN THE SALE SERVICE

    asked by Anonymous
  66. Pre-Cal

    [Note: i did these wrong apparently.. :( ] Simplify the trigonometry expressions as much as possible. (a). tan^(2)xsecx+secx (b).(csct-sint)/(csct)

    asked by Amber
  67. Pre-Cal

    [Note: I'm still having issues with identities with regard to trig] Verify the Trig. identities: (a). cot(x+y)=(cotxcoty-1)/(cotx+coty) (b). sin0(cot0+tan0)=sec0 [Note: 0=theta symbol]

    asked by Amber
  68. Math

    A large balloon has a volume of 2.50 L at 0 C. At what temperature 0 C will the volume of the gas be 3.60 L Assume constant temperature

    asked by Tina
  69. science

    what are some examples of suspension?

    asked by Anonymous
  70. Chemistry

    14 grams of coal undergoes complete combustion in 58 grams of oxygen gas. What volume of gas (measured at 25 degrees celsius and 100 kPa) is present when the reaction is complete?

    asked by James
  71. Pre Calculus

    Use the sum-to-product formulas to find the exact value of the given expression. sin 150° + sin 30°

    asked by Jessica Maths
  72. English

    1. All of a sudden a funny thing happened. 2. All of sudden a funny thing happened. ---------------------- Can we omit 'a' before 'sudden'? 3. detour (Do we stress the first syllable? Can we stress the second syllable?) 4. I have little money. 5. I have

    asked by rfvv
  73. pre cal

    Write a quadratic function that has roots of 41 and P.

    asked by ari
  74. Math

    How may ordered pair of positive integers satisfy the condition p+q+12=pq

    asked by Madhura
  75. macroeconomic

    Suppose in 2007 the United States Congress passes a minimum wage law that increases the minimum wage (the lowest legal wage) to $7.25 per hour and has a provision that increases the minimum wage at the beginning of each year based on the CPI for the

    asked by nasir
  76. Math

    Directrix at y=3,axis x=2 Latus rectum 4

    asked by Josa villa
  77. chemistry

    QUESTION 9 The number of moles of the reagent in excess can be used to calculate the moles of the products of the reaction. TRUE FALSE

    asked by Anonymous
  78. math

    volume of equilateral triangle with and area of 6 sq inches and height of 15 inches

    asked by taylor
  79. pre calculus

    Use the half-angle formula to simplify the given expression. squareroot 1+cos12x/2

    asked by jessica maths
  80. amth

    Solve the multiple-angle equation. cos x/2 = - squareroot 3/2

    asked by elise
  81. Anal geometry

    y=3,axis x=2 Latus rectum 4 determine the coordinates of V,F,L1,L2 and equation of directrix.

    asked by Josa villa
  82. physics

    suppose you are able to run at a constant speed of 11mph how long would it take you to run a marathon which is 26.2 miles? what percent of the marathon would you have completed after running 30 minutes?

    asked by glenn
  83. physics

    you live 6 miles away from a movie theatre on a particular day it takes you 18 minutes to get to the movie theatre from your house, only half as much time to get home what was your average speed in mph for driving from the theatre, driving home , and the

    asked by glenn
  84. Physics

    A resistor R is connected to a 12 V battery. The total current increases five times when a 400 Ohm resistor is added in parallel with it. The value of resistance R is? Please help me.

    asked by Zabe
  85. Business Law

    Should debtors who voluntarily incurred debts such as purchase of a home theater system be able to receive the same benefits of filing bankruptcy as individuals who incurred debts involuntarily, such as emergency medical bills? Explain and support your

    asked by Patte
  86. Social studies

    Clarify the international between executive and judiciary in four points

    asked by Bhawana
  87. Calculus

    Find the absolute maximum and minimum values of the function f(x)=3(x-2)^(2/3)+5 on the interval [1,10]? I'm not sure how to do this. Please help.

    asked by Jace
  88. Math

    The temperature deceased due to increase in altitude at the rate of 8 degrees Celsius per 1500 m the temperature at 4500 m above the ground level is 4 degrees Celsius find the temperature at ground level and at an altitude of 9000 m

    asked by Anonymous
  89. Psychology

    Psychics and astrologers are characterized as...

    asked by Anonymous
  90. pre cal

    2x−5√x+2=0 quadratic equations

    asked by ari
  91. Chemistry

    A student dilutes a solution so that its pH changes from 2.4 to 4.4. 10mL of the original solution was diluted by how many mL?

    asked by Anthony
  92. Chemistry

    Equation of Mg(OH)2 (aq) + KOH (aq) gives you what ?

    asked by Chris
  93. Algebra/Calculus

    If x + y = xy = 3, what is x^3 + y^3? I have tried solving this using algebra alone, but my teacher told me to use complex numbers, and I don't know how to start. Can someone please guide me to the solution to this problem? Thanks Kevin

    asked by Kevin
  94. English

    1. He has the least money of all his classmates. 2. He has the least money of all the boys in his class. 3. He has the least money of all the boys in his classroom. -------------------------- Are they all grammatical? Is #1 logically incorrect?

    asked by rfvv
  95. pre cal

    quadratic equation 2x^4-5x^2+2=0

    asked by ari
  96. pre cal

    (x/x-1)-(x/x+1) -2=0

    asked by ari
  97. Math

    the length of a garden is 4 more than the width.if the perimeter is at least 63 m and ar most 95 m what is the maximum possible integral length of the garden

    asked by Queen
  98. pre cal

    1/(x-1)- x/(x+1)-2=0

    asked by ari
  99. math

    the kitchen is 12 ft wide and 14 ft long how many six inch tile will I need to cover the floor

    asked by mike
  100. maths

    Use the product-to-sum formula to write the given product as a sum or difference. 6sin π/10 cos π/ 10

    asked by elise
  101. maths

    Find all solutions of the given equation in the interval Í0, 2π) cos x/2 − s i n x = 0

    asked by elise
  102. Math

    Directrix at y=3,axis x=2 Latus rectum 4

    asked by Josa villa
  103. Math

    Describe the end behaviour of 0.5(x-2\)^2\(x+1)(x-5)^3

    asked by Matt
  104. Even or Odd Funciton

    is f(x) = 1/(x^3 - 5x) even, odd or neither? i am thinking neither but im not too sure. cz when i sub in (-x) i get 1/((-x)^3-5(-x)) then i don't really know what this means.

    asked by Jen
  105. physics

    a woman walks along a circular path of radius of 15m it takes her 2min to get halfway around the path at this halfway point what is her approximate distance traveled, displacement, average speed in m/s, and average velocity in m/s?

    asked by glenn
  106. physics

    a man walks 0.9 miles around a shopping mall in half an hour what is his speed in miles per hour, in meters per second, and kilometers per day/?

    asked by glenn