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?

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

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?

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

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.)

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

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

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

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

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,

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

12. math

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

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 ?

14. math

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

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?

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

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

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?

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

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?

21. statistics

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

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

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

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

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.

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

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.

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

29. MATH

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

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.

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.

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?

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).

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 ,

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

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

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

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)

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

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?

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

42. Physics

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

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

44. chemistry

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

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 -

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,

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

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

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

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 ).

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.

52. science

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

53. math

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

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

55. maths

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

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!

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!

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.

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

60. MATH

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

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),

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

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

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,

65. MPA

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

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)

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]

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

69. science

what are some examples of suspension?

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?

71. Pre Calculus

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

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

73. pre cal

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

74. Math

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

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

76. Math

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

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

78. math

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

79. pre calculus

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

80. amth

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

81. Anal geometry

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

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?

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

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.

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

86. Social studies

Clarify the international between executive and judiciary in four points

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.

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

89. Psychology

Psychics and astrologers are characterized as...

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?

92. Chemistry

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

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

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?

96. pre cal

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

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

98. pre cal

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

99. math

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

100. maths

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

101. maths

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

102. Math

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

103. Math

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

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.