Posts by joseph
Total # Posts: 618

Maths
3x4y=24 and 5x+3y=11 
maths
solve the equation using cramer's rule. 3x+2y=12 and 2x+3y=7 
Maths
A certain number of children shared 42 sweets,each child got 8 sweet how many children shared the sweet? 
Chemistry
ok thankyou 
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. 
Science
Thanks! 
Science
Why do meteors start to burn in atmosphere? 
Unit Rates
I need help solving unit rates. I'll give an example: e.g.: 75% Highfiber chimp food to 25% Highprotein chimp food. I just want to know the steps required to solve these. 
math
if 1/2,1/x,1/3 are successive terms of an arithmetic progression. Show that 2x /x3 = 2/3. 
language
Barbra Jordan believes that we must put our faith in children because? 
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 ... 
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 ... 
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)= 
CHEMISTRY
CONC.OF NO2^AND H3O^+IN A SOLUTION IN WHICH 4.5% OH HNO2 WAS IONIZED 
Law
How do law reports help drive judicial precedent? Thank you. 
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 ... 
Statistics
56460 
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 ... 
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? 
Home economics
SOCIAL 
MATHS
sequence and series 
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 ? 
Math
Thinking of two whole numbers. The product of the two numbers is 28. Their difference is 3. What are the numbers? 
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? 
preal
If you roll a standard number cube 42 times, how many times do you expect the cube to show a six or an eight? 
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 ... 
Math (Probability)
0.002641 
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.? 
Mathematics
X+6 _________  \  \ x1 \  \ ____________\ 3x4 The area of the trapezium is 119cm. What is the value of x? Thank you. 
Mathematics
X+6 _________  \  \ x1 \  \ _____________\ 3x4 The area of the trapezium is 119cm. What is the value of x? Thank you. 
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. 
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.) 
math algebra
Sum the following term of progression to the last term, logx, logx^2 logx^3.... logx^120 
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! 
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... 
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. ... 
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? 
riddle
answer is death 
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... 
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 ?xaxis. Thanks 
Math
Convert to an exponential equation. log Subscript w Q=13 Thanks 
Chemistry
How many mL of 0.100 M NaOH are required to neutralize (or titrate) 25.0 mL of 0.15 M H3PO4? 
ss
1.C 2.D 100% CORRECT!!! 
math
Jenifer jogs at the rate of 3 3/4 miles per hour. How far does she jog in 1 5/6 hours? 
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! 
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 ... 
physical chemistry
The ice skate of a 210pound 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? 
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... 
physics
The ice skate of a 210pound 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? 
chemistry
The ice skate of a 210pound 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? 
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. 
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. 
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) 
Chemistry
V=(8.314 L?kPa/K?mol)(50?C)(3.2 mol)(101.325 kPa) 
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? 
Algebra
Can someone help me with this equation? The length of a rectangle is (2x+3) and the width is (x6). Write the equation and solve to find the value of x if the perimeter of the rectangle is 90 centimeters. 
Math
Would it be two? Since HHT and HTH? or HHT, THH, Hth? Thanks 
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. 
Physics
??????????????? 
Physics
288 
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 xaxis. Find a and b and the equation of the curve 
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 ... 
trade science
Final length of the bar of copper whose original length was 75mm When heated through 50 degrees 
trade science
Coefficient of cubical expansion 
trade science
Final length of the bar of copper whose original length was 75mm When heated through 50 degrees 
math
a girl walks 800 m on a bearing of 129 degrees.calculate how far east and south she is from her starting point. 
7th Math
ming rolls a number cube tosses a coin and chooses a card from two cards marked a and b 
Math
15 
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 
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 
math
most unsharpened pencils are hexagonal prisms. describe a vertical and horizontal cross section of a pencil 
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 
Math
What is the ratio in fraction form for 9 pints to 2 quarts 
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! 
english
what is the meaning of the Root bell 
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? 
Chemistry
An interference filter is to be constructed for isolation of the nitrobenzene absorption band at 1537 cm1. (a) If it is to be based on firstorder interference, what should be the thickness of the dielectric layer (refractive index of 1.34)? (b) What other wavelengths would ... 
Chemistry
For the gratings (84.0 lines per millimeter and 15.0 mm of illuminated area) calculate the wavelengths on the first and secondorder diffraction spectra at reflective angles of (a) 20 degrees and (b) 0 degrees. Assume the angle of incidence is 45 degrees. 
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] 
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 
math
find the hidden question. single load cost $2 and double load cost $4 
Math
11 + 2z= 14.78 Find the variable 
Math
14 + y/8 = 10 What is the variable? 
Math
d = 31 Thank you Ms. Sue 
Math
13+d=44 What does the variable represent 
Math
5/6 (2g+1)g Simplify the expression 
Math
Thank you 
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. 
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... 
Math
A percentage that represents the yearly increase in prices of things you buy is called 
MATH
You are asked to calculate the weight that a hotel elevator can safely carry. You should expect your answer to be 
math
Mr. Dunn drives a 12 mile round trip 3 times a week to the dog park. How many miles does he drive? 
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 
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 
Math
If the temperature was 10F and dropped by 16F what would the temperature be? 
Trigonometry
An automobile tire has a diameter of 36 inches. How many revolution will the wheel make as the automobile travel 1 mile 
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? 
Science
A 
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... 
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...