Posts by joseph

Total # Posts: 618

1. Maths

3x-4y=24 and 5x+3y=11
2. maths

solve the equation using cramer's rule. 3x+2y=12 and 2x+3y=7
3. Maths

A certain number of children shared 42 sweets,each child got 8 sweet how many children shared the sweet?

ok thankyou
5. Chemistry

At 25oC, the equilibrium pressure of ammonia vapour above a 0.500 M aqueous ammonia solution is 0.84 kPa. Calculate the Henry's law constant for ammonia in M/bar. Do not include units. Include 4 significant figures.

Thanks!
7. Science

Why do meteors start to burn in atmosphere?
8. Unit Rates

I need help solving unit rates. I'll give an example: e.g.: 75% High-fiber chimp food to 25% High-protein chimp food. I just want to know the steps required to solve these.
9. math

if 1/2,1/x,1/3 are successive terms of an arithmetic progression. Show that 2-x /x-3 = 2/3.
10. language

Barbra Jordan believes that we must put our faith in children because?
11. Mathematics

Perfume is sold in two different sizes of bottle The 80ml bottle is priced at £55 The 50ml bottle is usually priced at £45, but is on special offer If you buy one 50ml bottle of perfume, you get a second for half price By calculating the price per ml determine ...
12. Science, Chemistry

A 25.0 mL sample of a 0.0600 M solution of aqueous trimethylamine is titrated with a 0.0750 M solution of HCl. Calculate the pH of the solution after 10.0, 20.0, and 30.0 mL of acid have been added; pKb of (CH3)3N = 4.19 at 25°C. I already calculated pH of the solution ...
13. Math

Compute K(?)=20lg(1/(1+???)12), as ?=1.3, ?=R?C, R=992 ja C=0.001. Use two decimals in your answer. K(1.3)=
14. CHEMISTRY

CONC.OF NO2^-AND H3O^+IN A SOLUTION IN WHICH 4.5% OH HNO2 WAS IONIZED
15. Law

How do law reports help drive judicial precedent? Thank you.
16. Physics

The constant resistance of a resistor is 30 ohms, independent of the temperature. The resistor is made up of an aluminium resistor with resistance R1 at 0°C in series with a carbon resistor with resistance R2 at 0°C. Evaluate R1 and R2, temperature coefficient for ...

56460
18. physics

a motorbike weighs 400kg accelerates uniformly at 1.5m/s2 from rest to 22m/s. then the brakes are applied and it stops 2.5s later. (a)Sketch a graph showing the motion history (b)From the sketch,determine the total distance traveled (c)Determine the momentum of the car before ...
19. Math

Five years ago, a father was 3 times as old as his son. Now, their combined ages amount to 110 years. Thus, the present age of the father is?

SOCIAL
21. MATHS

sequence and series
22. math

a rectangular field is 3/4 of a mile long and 2/10 of a mile wide . what is the field in square miles ?
23. Math

Thinking of two whole numbers. The product of the two numbers is 28. Their difference is 3. What are the numbers?
24. Chemistry

A solution is made by dissolving 10.20 grams of glucose (C6H12O6) in 355 grams of water. What is the freezing point depression of the solvent if the freezing point constant is -1.86 °C/m?
25. pre-al

If you roll a standard number cube 42 times, how many times do you expect the cube to show a six or an eight?
26. Social Studies

1.What was North Korea's response to president George W. Bush's 2001 threat to stop negotiations? A.North Korea immediately gave into his list of conditions B.North Korea resumed to nuclear program C.North Korea sought the help of the United National D.North Korea ...

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28. Calculus

Estimate the area under the graph of f(x)=cos((pi/4)x) from x=-2 to x=2 using 3 rectangles of equal width, using left and right endpoints.?
29. Mathematics

X+6 _________ | \ | \ |x-1 \ | \ |____________\ 3x-4 The area of the trapezium is 119cm. What is the value of x? Thank you.
30. Mathematics

X+6 _________ | \ | \ |x-1 \ | \ |_____________\ 3x-4 The area of the trapezium is 119cm. What is the value of x? Thank you.
31. Mathematics

A rectangle has been divided into two strips, A and B. The strips have the same width. 2/5 of strip A is shaded. 5/8 of strip B is shaded. The length of the rectangle is 40cm. What fraction of the rectangle is not shaded? Thank you. Joseph.
32. Physics

A wet bar of soap slides freely down a ramp 17.0 m long, inclined at 38.0 degrees. How long (in seconds) does it take to reach the bottom? (Neglect friction.)
33. math algebra

Sum the following term of progression to the last term, logx, logx^2 logx^3.... logx^120
34. English

Sorry but I'm useless here. I am not really good at writing. That's why I usually use the help of Supreme essay service. Those guys usually both proofread and edit my papers. So if you want you can definitely give them a try. Good luck!
35. physics

Lake Champlain, bordered by New York, Vermont, and Quebec, has a surface area of 1,126 km^2. If the energy (173 PJ) is provided by sunlight shining on the lake at an average rate of 200 W/m^2 but with only half that amount absorbed, how long will it take the lake to absorb the...
36. english

Well, I'm not sure if you still need some help in writing, but I would recommend you to google. There are plenty of tips and samples available online. In case you would need some professional help, I would recommend you to contact Supreme essay service. Give them a try. ...
37. Science

Pls help me solve this question pls. A stone of mass 6.5kg is thrown vertically upward with velocity with 10m/s find a. the potential energy at the greatest height and the value of h .b the kinetic energy of reaching the ground again(g=10m/s2) in physics?

39. Physics

A 15 ft plank of mass 50 kg is laid across two ladders. The ladders are 5 ft apart, and the plank is laid such that 5 ft of it hang off at each end. You have a mass of 90 kg. (a) How far out past the ladder can you walk before it gets dangerous? I tried doing m1r1=m2r2 (33.33...
40. Algebra

Write an equation for a function that has a graph with the given characteristics. The shape of y=^3 squareroot x is shifted 7.3 units to the left. This graph is then vertically stretched by a factor of 9. ?Finally, the graph is reflected across the ?x-axis. Thanks
41. Math

Convert to an exponential equation. log Subscript w Q=13 Thanks
42. Chemistry

How many mL of 0.100 M NaOH are required to neutralize (or titrate) 25.0 mL of 0.15 M H3PO4?
43. ss

1.C 2.D 100% CORRECT!!!
44. math

Jenifer jogs at the rate of 3 3/4 miles per hour. How far does she jog in 1 5/6 hours?
45. Chemistry 1

Use the equation Q = mc?T Q =(m)(c)(?T) =(22.0g)(4.184J/g°C)(75°C) =6903.6J =6900J (if you need to round to nearest sig fig) Hope this helps!
46. biology

Quick Answer: "I" Explanation: Since you're forming an iconic bond, you want to get the total valance electrons to 8. Elements under 1A all have 1 valance electron, so all you really need to do is find an element with 7 electrons which under VIIIA column(7th ...
47. physical chemistry

The ice skate of a 210-pound hockey player is in contact with the ice over a 2.5mm x 15cm area. Determine the freezing point of the ice under the blade of the skate?
48. Chemistry

Consider an ionic compound, MX2, composed of generic metal M and generic, gaseous halogen X. The enthalpy of formation of MX2 is ΔHf° = –799 kJ/mol. The enthalpy of sublimation of M is ΔHsub = 157 kJ/mol. The first and second ionization energies of M are IE1...
49. physics

The ice skate of a 210-pound hockey player is in contact with the ice over a 2.5mm x 15cm area. Determine the freezing point of the ice under the blade of the skate?
50. chemistry

The ice skate of a 210-pound hockey player is in contact with the ice over a 2.5mm x 15cm area. Determine the freezing point of the ice under the blade of the skate?
51. physics

Calculate the freezing point of water at a depth of 10.0 cm below the surface of the water. The density of the water is 0.9998 g/cm3.
52. chemistry

Calculate the freezing point of water at a depth of 10.0 cm below the surface of the water. The density of the water is 0.9998 g/cm3.
53. chemistry

For each pair of compounds, predict which species will have the higher molar entropy at 298 K and 1 bar. Be sure to state your reasons for your choice. 1. N2(g) vs. F2(g) 2. ICl (g) vs. BrF(g) 3. 6Li(s) vs. 7Li(s)
54. Chemistry

V=(8.314 L?kPa/K?mol)(50?C)(3.2 mol)(101.325 kPa)
55. Calculus

I want to know how to find the local linearization. So in this problem I'm doing, I'm given the f(x) equation and it says "about x = 0" I'm suppose to approximate value of f(0.3) Are there specific steps I need to take to go about this problem?
56. Algebra

Can someone help me with this equation? The length of a rectangle is (2x+3) and the width is (x-6). Write the equation and solve to find the value of x if the perimeter of the rectangle is 90 centimeters.
57. Math

Would it be two? Since HHT and HTH? or HHT, THH, Hth? Thanks
58. Math

Use a tree diagram or systematic list to determine the number of ways a nickel, a dime, and a quarter can be flipped to get exactly one tail.
59. Physics

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288
61. math

The gradient of a curve at (1,-11) is ax^2 + b at all points. The tangent at (2,-16) is parallel to the x-axis. Find a and b and the equation of the curve
62. Math

A class of 23 students was using square tiles to build rectangular shapes. Each student had more than 1 tile and each had a different number of tiles. Each student was able to build only one shape of rectangle. All tiles had to be used to build a rectangle and the rectangle ...

Final length of the bar of copper whose original length was 75mm When heated through 50 degrees

Co-efficient of cubical expansion

Final length of the bar of copper whose original length was 75mm When heated through 50 degrees
66. math

a girl walks 800 m on a bearing of 129 degrees.calculate how far east and south she is from her starting point.
67. 7th Math

ming rolls a number cube tosses a coin and chooses a card from two cards marked a and b

15
69. math

the brown family boarded a train at 3:55 P.M. to go home from the county fair. it took them 25 minutes to get to the train station from the fair. they spent 75 minutes at the fair. what time did they arrive at the fair
70. math

the volume of a rectangular prism is 2,058 cm3. The length of the prism is three times the width. The height is 14 centimeters. Find the other dimensions
71. math

most unsharpened pencils are hexagonal prisms. describe a vertical and horizontal cross section of a pencil
72. Math

Trying to find the volume of a rectangle. The lenght is 8/9 the wideth is 1/6 and the height is 1/3. And can't seem to solve the problem. Can you please help
73. Math

What is the ratio in fraction form for 9 pints to 2 quarts
74. English

Yes, you are right here. But, anyway, as I'm not really good at writing, I would recommend you to contact Supreme essay service. Give them a try!
75. english

what is the meaning of the Root bell
76. Physics

An object 20cm high is placed 40cm from a lens of focal length 24cm. Calculate: a) The power of the Lens? b) The distance from the lens to the position of the image?
77. Chemistry

An interference filter is to be constructed for isolation of the nitrobenzene absorption band at 1537 cm-1. (a) If it is to be based on first-order interference, what should be the thickness of the dielectric layer (refractive index of 1.34)? (b) What other wavelengths would ...
78. Chemistry

For the gratings (84.0 lines per millimeter and 15.0 mm of illuminated area) calculate the wavelengths on the first and second-order diffraction spectra at reflective angles of (a) 20 degrees and (b) 0 degrees. Assume the angle of incidence is 45 degrees.
79. physics

weights of man 10kg and 8kg are placed near p and q respectively one each end of the beam calculate the Reactions at p and q. [1kg is 10N]
80. physics

a uniform beam 6.0m long and weighing 4kg on support of p and q placed let and right 1.0m from each end of the beam
81. math

find the hidden question. single load cost \$2 and double load cost \$4
82. Math

11 + 2z= 14.78 Find the variable
83. Math

14 + y/8 = 10 What is the variable?
84. Math

d = 31 Thank you Ms. Sue
85. Math

13+d=44 What does the variable represent
86. Math

5/6 (2g+1)-g Simplify the expression

Thank you
88. Math

Two even integers are represented by 2n and 2n+2. Explain how you can find the value of those integers if their sum is 14. Name the integers.
89. chemistry (moles)

2.5g of a mixture of anhydrous BaOH and BaCl2 was dissolved in distilled water and made up to 250cm3. 20cm3 of this solution required 19cm3 of 0.1moldm3 of dilute nitric acid for complete reaction. Calculate the percentage by mass of BaCl2 present in the mixture. The answer is...
90. Math

A percentage that represents the yearly increase in prices of things you buy is called
91. MATH

You are asked to calculate the weight that a hotel elevator can safely carry. You should expect your answer to be
92. math

Mr. Dunn drives a 12 mile round trip 3 times a week to the dog park. How many miles does he drive?
93. Math

Exponetial Functions In the following exponential relations, solve for x using logarithms. Round your answers to 4 decimal places. a) 5^3x=65 b) 2^2x+3=80
94. maths physics chemistry

State the principle on which each of the following is based. (a) the equation of continuity, Av = constant (b) the Bernoulli equation
95. Math

If the temperature was -10F and dropped by 16F what would the temperature be?
96. Trigonometry

An automobile tire has a diameter of 36 inches. How many revolution will the wheel make as the automobile travel 1 mile
97. Physics

Bill is moving a crate of mass 35 kg up a ramp that forms a 25 degree angle with the horizontal to a height of 5 m. A) If the ramp is frictionless, how much work must Bill do in pushing the crate to the top? B) How much work does gravity do as Bill pushes the crate up the ramp?

A
99. Chemistry

At the start of a road trip, the pressure of the air in a car tire is 276kPa and the temperature is 12.0 degrees Celsius. After driving for some time the pressure in the tire is now 303kPa. Assuming that the volume of the air inside the tire remains constant, determine the new...
100. Physics

At the start of a road trip, the pressure of the air in a car tyre is 276kPa and the temperature is 12.0 degrees celsius. After driving for some time the pressure in the tyre is now 303kPa. Assuming that the volume of the air inside the tire remains constant, determine the new...
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