Tuesday
July 22, 2014

Posts by Chris


Total # Posts: 2,141

algebra
N(x)= -0.4x^2 + 11.2x +10 solve for x

Chemistry
If 0.120 moles of water are produced in the reaction H+(aq)+OH-(aq)=H2O deltaH=-56.2kj/mol

Chemistry
If 0.120 moles of water are produced in the reaction H+(aq)+OH-(aq)=H2O deltaH=-56.2kj/mol

Chemistry
Delta H reaction for the following reaction: C(s)+H2O(g)=>CO(g)+H2(g)

algebra
Can anyone solve A= 1/2h(a+b) solve for h

Math
A tile is 38 cm long and the space between the tiles is 0.8. How many tiles are required to build a floor 5.82 m long?

Math
A tile is 38 cm long and the space between the tiles is 0.8. How many tiles are required to build a floor 5.82 m long?

physics
Imgaine that a cart intially moving with velocity V_0, collides with a cart at rest and then the two carts stick together. Find a equation for potential energy in this case.

chemistry
What mass of oxygen is needed for the complete combustion of 2.60×10−3 of methane? Express your answer with the appropriate units.

CHEMISTRY
What mass of water is produced from the complete combustion of 2.60×10−3 of methane? Express your answer with the appropriate units.

chemistry
What mass of carbon dioxide is produced from the complete combustion of 2.60×10−3 of methane?

social s.
another word for trail of tears

CHEMISTRY
What coefficients are needed to balance the equation for the complete combustion of methane? Enter the coefficients in the order CH4,O2,CO2, and H2O,respectively. Express your answer as four integers, separated by commas (e.g., 1,2,3,4).

chemistry
For a week acid whose ionization constant is 1.75 x 10(-5), the pH of its solution is 3.0. Determine its degree of ionization and its percent ionization.

chemistry
Write an equation for the hydrolysis of each of the following salt: i) NaCH2H3O2; ii) Na2CO3; iii) NH4Br

chemistry
Determine the mass of KHP (molar mas = 204.2 g/mol) that is required to react with 30.0 mL of 1.0 M Na0H (molar mass 40.0 g/mol)if the reaction is NaOH + KHP --> NaKP + H2O

chemistry
Account for the increase in reaction rate brought about by a catalyst.

chemistry
Explain the difference between the rate of a reaction and its rate constant.

geometry
M is the midpoint of AB. AM=5x and MB=3x+4. find x.

Chemistry
a titration experiment 20 mL solution of hydrochloric acid required 15.2mL of a .879 M barium hydroxide solution. What was the molar concentration of the HCl solution?

chemistry
The energy levels the electron can occupy in the H atom can be calculated using the energy level equation. Calculate the wavelength (nm) of the photon absorbed when the electron goes from a n= 1 energy level to a n= 3 energy level. Express answer in scientific notation. unders...

Calculus
Find the indicated limits. If the limit does not exist, so state, or use the symbol + ∞ or - ∞. f(x) = { 2 - x if x ≤ 3 { -1 + 3x - x^2 if x > 3 a) lim 3+ f(x) x->3 b) lim 3- f(x) x->3 c) lim f(x) x->3 d) lim ∞ f(x) x->3 e) lim -∞ f...

algebra
Simplify each expression. Justify your steps using the Commutative, Associative and Distributive Properties when necessary 8k2 + 4k - 3k2 + 3^2 - k + 5 Please let me

algebra
write an expression that has five terms and simplifies to 5m3 + 4n. Please give me the steps

Calculus
f a rock is thrown upward on the planet Mars with a velocity of 7 m/s, its height in meters t seconds later is given by y = 7t − 1.86t^2. (Round your answers to two decimal places.) Estimate the instantaneous velocity when t = 1.

geometry
Triangle XYZ above is similar to triangle UVW (not shown). If the length of one side of triangle UVW is 60, then what is one possible perimeter of triangle UVW

Math
Would it be plausible for Car B to catch Car A within .5 mile?

Math
Car A is travelling at a constant speed of 100mph at the time it passes a stationary vehicle (Car B). If the Car B hopes to catch Car A within a mile, how fast must Car B travel? Assume Car B can accelerate from 0-60mph in 6 seconds.

Chemistry
What are the molecular and net ionic equations for potassium chloride + ammonium phosphate

Chemistry
How many number of ions of each type are present in the following aqueous solution? 113 mL of .490 M aluminum chloride.

Math
12r-4r=48 What is r?

math
construct-angle-f-so-that-m-angle-f-equals-2-m-angle-c

budgeting
Whats the answer please.

physical geology
Select a city or region that is faced with one of the following issues: o Saltwater invasion in coastal wells o Depletion of an aquifer for drinking or agricultural water o Subsidence associated with water pumping o Depletion or pollution of surface water from human use o Land...

MATH-
A ROCK IS DROPPED INTO A DRY WELL. THE TOTAL TIME TO REACH THE BOTTOM NAD FOR THE SOUND TO TRAVEL BACK TO THE TOP IS 6.7 S. WHAT IS THE DEPTH OF THE WELL TO THE NEAREST FOOT.

physics
Two cars are initially moving at constant speeds of 50 m/s (first car) and 30 m/s (second car) along a straight track with the first car being behind. At a certain point (e.g. point A) on the track the first car overtakes the other one. At this very moment of time the first ca...

Physics
Two students are on a balcony 24.9 m above the street. One student throws a ball, b1, vertically downward at 19.6 m/s. At the same instant, the other student throws a ball, b2, vertically upward at the same speed. The second ball just misses the balcony on the way down. (a) Wh...

earth
Compared with the strength of Earth's gravity at its surface, how much weaker is gravity at a distance of 11 Earth radii from Earth's center?

ivcc
What is the magnitude of the apparent weight of a 76 astronaut 3200 from the center of the Earth's Moon in a space vehicle accelerating toward the Moon at 3.6 ?

Chemistry
How many moles of Io3 are present in a 100mL solution containing 1.390g of KIO3

Science
How many moles of Io3 are present in a 100mL solution containing 1.390g of KIO3

chemistry
What is the mass of 1.2 grams of oxygen if it occupies a volume of 500 cubic centimeters at s.t.p?

algebra
Explain how to find the sum using game chips, then give the answer 8+-10

sociality
what are the dimentions of cultural diversity?

science
Pure gold has a density of 19.32 g/cm3. How large would a piece of gold be if it had a mass of 483 g?

algebra
= 25/12 x (-7) = -175/12 = -14.583333

physics
a uniform ladder 16 m long weighing 80 N leans against a smooth vertical wall, making 30 degree with the wall. Find the thrust of the wall, and the force of the point on the ground.

statistics
The scores on the final exam in a course have approximately a bell-shaped distribution. The mean score was 72, the highest score was 99, and the lowest score was 41. Use the value of the range (58) to estimate the value of the standard deviation. (Round your answer to the near...

geometry
there for B and C is 18

geometry
i think you have your nummbers mixed up for its not posible to have A and C shorter then A and B since A and B are part of the line

physics
1. A ball rolling on a platform at 4 m/s rolls off of the platform at 4 m/s and hits the ground 8 m from the base of the platform. a. How long does it take the ball to hit the ground? b. How high is the platform?

physics
a car traveling 7.0 m/s accelerates uniformly at 2.5 m/s squared to reach a speed of 12 m/s. how long does it take for the acceleration to occur?

finance
You borrow $185,000 to buy a house. The mortgage rate is 6.5 percent and the loan period is 32 years. Payments are made monthly. If you pay the mortgage according to the loan agreement, how much total interest will you pay?

MATH
Triangle T has vertices A(-9, 10)B(1,0)and C(5,4). Points A, B, and P(also on th xy plane) form a triangle that is congruent to triangle T. Find all the possible coordinates for P.

Ottawa University
Triangle T has vertices A(-9, 10)B(1,0)and C(5,4). Points A, B, and P(also on th xy plane) form a triangle that is congruent to triangle T. Find all the possible coordinates for P.

brain teaser
Bono (1) walks over with Edge (2), 2 minutes, Bono walks back, 1 minute (3 total), Larry (10) and Adam (5), walk across, 10 minutes (13 total), Edge Walks Back, 2 minutes (15 total), Edge and Bono walk back, 2 minutes (17 total)

science
How do you calculate the gravity of an object? equation needed h=1/2 gt^2 Solve the equation for g; g=2h/t^2 Set height is 2 foot, dropped small object from 2ft, timed at 0.3 seconds. Calculate the gravity of the object. Is this right? 2=1/2*9.8 t^2 t^2=2*2/9.8=0.40 t=0.40^ An...

science
Simpson drives his car with an average velocity of 48.0 km/h to the east. How long will it take him to drive 144 km on a straight highway?

science
It take you 9.5 min to walk with an average velocity of 1.2 m/s to the north from the bus stop to the museum entrance. What is your displacewment?

scientist
Which of the following BEST describes the theory of natural selection?

Math
How many two block towers can you make from: 1 black block,1 red block, and 1 blue block? Please explain.

Math
I have a shirt, a skirt, a blouse and a pant. How many different outfits can I make?

math
a(1,7),b(-3,1) coordinates of missing endpoint if b is the midpoint of ac

5th grade math
.4 equals how many hundreths? .07 equals how may thousandths? Do you just multiply the .4 by 100 and do you just multiply the .07 by 1000?

Science
Two tugboats are towing a ship. Each exerts a horizontal force of 5 tons and the angle between their towropes is 90°. What net force is exerted on the ship?

Physics
A child bounces a 55 g superball on the side- walk. The velocity change of the superball is from 22 m/s downward to 14 m/s upward. If the contact time with the sidewalk is 1 800 s, what is the magnitude of the average force exerted on the superball by the sidewalk? Answer in u...

statistics
You have been approached by the editor of gentlemen's magazine to carry ot a research study. The magazine has been unsuccessful in atracting shoe manufacturers as advertisers. When the sales force tried to secure advertising from shoe manufacurers, they were told men's...

physics
7

trig
A ferris wheel with a diameter of 100 feet rotates at a constant rate of 4 revolutions per minute. Let the center of the ferris wheel be at the origin. 1. Each of the ferris wheel's cars travels around a cirlce. a) Write an equation of the circle where x and y are measured...

Algebra
T=6+20/n+2. Solve please

math
given the function f(x)= x+2, find each of the following f(7), f(-6), f(0)

Math
Please factor X^2+3x+2

Math
How do I solve X^2+3x+2

Math
X^2+3x+2

Algebra
Maria bicycles 5 km/h faster than Robert. In the same time it takes Robert to bicycle 60 km, Maria can bicycle 75km. How fast does each bicyclist travel?

math
none of ur business

math 209
The perimeter of a rectangle is 44ft the length is 4ft longer than the width. Find the demensions. Write a system of linear equations and solve the resulting system. Let x be the length and y be the width.

218
I have a question for Mrs. Sue. When you used quotations around University when describing Ashford were you trying to suggest something? I am about to finish my accounting degree there and have often wondered if I will fin discrimination because of the stigma that is associate...

math
what is a proof of the pythagoarean theorem?

Geometry
What is Two capital letters printed in sequence

Geometry
M and N are the midpoints of PR(which has a line over PR) and QR(which has a line over QR)respectively. Using graph paper, repeat this process from the last problem using different coordinates for P, Q, and R. How do these lengths MN and PQ compare now? What do you think you c...

Geometry
M and N are the midpoints ofandrespectively. Using graph paper, repeat this process from the last problem using different coordinates for P, Q, and R. How do these lengths MN and PQ compare now? What do you think you can conclude about the lengths of these segments? (In your a...

Geometry
Use the diagram below for the following question. P(2,1), Q(11,1), and R(8,7) M and N are the midpoints of PR (which has a line over PR)and QR (which has a line over QR) respectively. Find MN and PQ. How do these lengths compare with each other

Geometry
Use the diagram below for the following question. P(2,1), Q(11,1), and R(8,7) M and N are the midpoints ofandrespectively. Find MN and PQ. How do these lengths compare with each other?.

Chem
What is the wavelenght of a radio station operating at a frequency of 99.6 MHz?

Chem
A certain shell is known to have a total of 16 orbitals, which shell is it?

Chem
What is the speed of an argon atom that has a de Broglie wavelength of 5.2 pm?

math
Find the number of round trip commuter rail tickets sold. 1.Thirty times as many round trip tickets as 12 ride tickets were sold. 2.The total number of tickets sold represented 1440 rides Example of chart below Rides per ticket x Number of tickets sold = Total rides 12 ride ti...

algebra
the length of a rectangle is twice its width w. A second triangle, which is 8cm longer and 3 cm narrower than the first triangle, has a perimeter 154 cm. What is the dimension of each triangle.

algebra
a boat weighs 1500 lbs more than its motor and 1900 lbs more than its trailer. Together the boat and motor weigh five times as much as the trailer. How much does the boat weigh? Please explain or show how to set up the equation.

algebra
the greater of two consecutive integers is 20 more than twice the smaller. what are the integers

Chem
What is the mole fraction of H2 in a mixture with the total pressure of 800 torr when the partial pressure of H2 is 90 torr?

Chem
In an experiment, 7.5 mol of a gas are held in a 3.5 L container at 39 c. What pressure does the gas exert if it is assumed to be ideal?

Chem
In an experiment, 25.0 ml of a gas with a pressure of 1. atm is contained in a balloon at 25.0 c. The Balloon is then cooled to 5.0 c, and the pressure is found to be .750 atm. What is the volume of the gas under the new conditions?

Chem
What is the volume of a gas that exerts a pressure of 457 mm Hg, if it excerted a pressure of 250 atm when its volume was 25.0 ml.

Chem
A Baloon is filled with 3.00 L of helium at a pressure of 765 Torr. What is the volume of the baloon at an altitude where the atmospheric pressure is 530 torr?

statistics
Classify the variable as nominal, ordinal, discrete, or continuous, and explain: Customer’s driver’s license number

chemistry
How many grams of HCl must be added to make 1 liter of a 2.0 M HCl solution

College Physics
100 grams of molten lead (600oC) is used to make musket balls. If the lead shot is allowed to cool to room temperature (21oC), what is the change in entropy (in J/K) of the lead? (For the specific heat of molten and solid lead use 1.29 J/g oC; the latent heat of fusion and the...

Calculus ll
find the second order derivative, rxy(x,y) for r(x,y)=xy/8x+5y

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