Friday
August 1, 2014

Posts by Ann


Total # Posts: 1,207

chemistry
If a reaction has rate constant of 1.33 s^-1 at 206 deg C and an activation energy of 58.6 kj mol^-1. whats the rate constant at 358 deg C ?

chemistry
Hello, Please help me with this question! Which dilution would turn 10% (by mass) HCl solution into 0.100 M HCl solution? Density of 10% HCL = 1.08 g ml^-1

physics
A Honda Civic travels in a straight line along a road. Its distance x from a stop sign is given as a function of time t by the equation x(t)= α t2− β t3, where α = 1.43m/s2 and β = 4.60×10−2m/s3 . 1)Calculate the average velocity of the ca...

math
4x+5y=5 x=y-10

nau
4x+y==21 7x-4y=8

Ethics and moral reasoning
What is the difference between an internal good and an external good according to Maclyntyre's account?

Ethics and moral reasoning
Need help with Ethics and moral reasoning Reading Quiz 4

chem/math
I need help solving for x here (I dont get the right answer, which is supposed to be x=0.137) 3.88 = 3.74 + log (x/0.1) Please explain how you would get that answer Thank you

chemistry
What are the consequences of using only a very dilute solution of HCl or a very concentrated solution of HCl in attempting to return the pH? in attempting to return the pH to 7? What is a better alternative?

Statistics
The life of a blood pressure monitor has a normal distribution with an average of 40 years and a standard deviation of one year. What should the warranty be to replace a malfunctioning monitor with - if the company does not want to replace more than 1% of all the monitor. Than...

Physics
A sled of mass 9.0 kg is sliding across a frozen lake with a speed of 5.0 m/s. A package of mass 4.0 kg is dropped onto it from above. Assuming there is no friction between the sled and the lake, what is the new speed of the sled?

Biology Please help
There are several genes that control eye color; eye color is therefore called a (A) Polygenic trait. Besides genes that directly control eye color, there are other genes that can affect the color of your eyes. For example, your eye color genes may code for green eyes, but if y...

Algebra
13a+9b-2a-4b

Calculus
Solve the differential equation dy/dx=3x^2y^2 with the condition that y(1)=4. I know that y= -1/(x^3 + c) but what do I do with the y(1)=4 part?

Calculus
The marginal revenue for x items in dollars is given by R′(x)=−4.5x+6. Determine (a) the revenue function and (b) the demand function. I know the revenue function is R(x)=6x-2.25x^2 just by finding the antiderivative. demand = revenue - cost, but how do I even find...

Calculus
Find f(x) if f′(x)=(−3)⋅x+(−1) and f(−4)=−1. I know if you find the antiderivative of f'(x) it is -3x^2/2 - x + c but what do I do next to find the function f(x)?

Calculus
thank you and yes it was months

Calculus
The rate at which an item depreciates is proportional to its value at that instant. If an item is presently values at $70,000 and 10 months later it is valued at $22,222, when in years will it be valued at $19,999? I'm not sure what formula to use...

Calculus
okay thanks

Calculus
How long must 4500 dollars be left on deposit at 8 percent compounded quarterly to reach a total accumulation of 15825 dollars? I did A=P(1+ r/n)^nt so I got 15825 = 4500 ( 1 + 0.08/4)^4t, and got t = 3.24886 years...am I even using the right formula?

Calculus
thank you for your explanation :)

Calculus
sorry it's log(base6)(x+3)−log(base6)(x−5)=2 the x in front of log isn't part of it

Calculus
Solve for x log(base6)(x+3)−log(base6)(x−5)=2. I tried to factor out the log(base6) and got (x+3)^x/(x-5)=2, but I don't know how to solve that...

Calculus
okay

Calculus
oh right you just have to factor out the logbase5...thank you

Calculus
Find A so that 5log(base5)16807 − 3log(base5)7 = log (base5)A I don't even know how to start this one...should I remove the 5 and 3 in front of the logs?

Calculus
thanks that makes sense

Calculus
Using log2=.3010 and log5=.6990 compute log2000000. 100000/5 = 20000 so I just did 20000*.699 = 13980 and then added .301 which equals 13980.3 ^I know that was wrong

Calculus
thank you!

Calculus
Use the Laws of logarithms to rewrite the expression log(1000000x^19)in a form with no logarithm of a product, quotient or power. After rewriting we have log(1000000x^19)= A + Blog(x)? I know B = 19, but what's A?

Calculus
it still says I'm wrong, but thanks for trying

Calculus
so would concave up be (1.34205, 2.37222)?

Calculus
f(x)=[3x^13]e^(−7x) On which intervals is the function concave up and concave down? I know when you find the 2nd derivative, the x-values are 0, 1.34206, and 2.37222, and that the 2nd derivative > 0 at x=1.34205 and < 0 at 2.37222. How does this tell me the interva...

Calculus
thanks

Calculus
The quantity Q of radioactive carbon remaining in a 200-gram wood sample at time t is given by the expression Q(t)=200e^(−0.000225⋅t). How much radioactive carbon remains in the sample after 100500 years? I just plugged in 100500 as t and got 3.02375 grams as an an...

Calculus
thanks!

Calculus
How much should be deposited into an account today if it is to accumulate to $32400 in 30 years if the account bears interest at 8.01% compounded monthly? I did A = 32400(1 + 0.0801/12)^(12*30) = $355,375, but that's wrong...

Calculus
ok thanks

Calculus
I thought it would just be A = 88e^(0.07*9), which equals 165.23 pounds, but apparently that's not correct...

Calculus
Poli 761 (a fictitious substance) decays by about 7% every day. How much of a 88 pound sample remains after 9 days?

Calculus
thank you!

Calculus
Why does 2ln6 - 2ln3 = ln4?

maths
1234567 x 7654321

Math
Write the inequality and solve: The product of a number and 7 is less than 28

geometry
Hi, could someone explain to me the steps I should take to solve the following problem. If radius BE is a perpendicular bisector of chord AC, then what is AB to the nearest tenth? BD is 7cm and DC is 9.

geometry
The radius of the earth is approximately 6371 km.If the international space station (ISS) is orbiting 353 km above the earth, find the distance from the ISS to the horizon(x)

geometry
10^2=x•(x+3x) Use quadratic formula to solve

Calculus
no, but thanks for your answer!

Calculus
Evaluate ∫(2x^3/√(1-x^4))dx I can't figure out what u and du is... please help thanks

Calculus
Given f(x)=−2x^3 -3x + 1, the value of the derivative of the inverse function, f^−1(x) at x=−21 is (f^1)′(−21)= ? please explain how to solve this

Calculus
If e^x = 243 and e^y = 32 then e^((3x + 4y)/5) =? The answer is 432, but I don't understand why.

Calculus
Thank you very much!

Calculus
The height in feet above the ground of a ball thrown upwards from the top of a building is given by s=-16t^2 + 160t + 200, where t is the time in seconds. If the maximum height is 600 feet, what is v^-1(32)? The answer is supposed to be 4 seconds, but I don't understand ho...

algebra
Mary has a total of $5000 invested in two accounts. One account pays 5% and the other 8%. Her interest in the first year was $331. Write and solve a system of equations to find out how much she has invested in both accounts

geometry
If I need to make a mold with a square base with a volume of exactly 28 cubic centimeters how many possible molds could I make?

chemistry
its actually my fault sorry :$ , i wrote the question wrong its barium oxide + water so would it be BaO + H2O --> Ba(OH)2 ??

chemistry
oh so for barium + water the chemical equation is BaO + H2O but how do i figure out the rest?

chemistry anyone??? help!!
help me please!! i dont get it

chemistry
what is the chemical & word equation of sulfur dioxide + water i don't understand this, can someone please explain to me how to do this!!?

literacy
thankyou Ms.Sue!! :D

literacy
can i just show u tomorrow then if u don't mind? please and thank you !! :)

literacy
its not really for a class i'm just practicing for the osslt test. so will u actually mark it and give feedback??

literacy
and also i have another question. if i write me news report will u pleasee give it a level out of 6 ??

literacy
so should it be: "a major ice storm shuts down the region of ... on january 27 2012" ??

literacy
so can my lead sentence be " on january 27 2012 a major ice storm shut down the whole region of ..." ??

literacy
how do you write a news report on the topic "storm shuts down region"??

literacy
oh okay thanks!! (:

literacy - Ms. Sue???
will u mark them and give it a level?

literacy
im in grade 10 and if i do the osslt literacy practice tests. will someone on here mark my writing tasks? i can mark the multiple choice questions on my own but i just need someone to mark the writing stuff

Chemistry
find the freezing point of a solution containing 3 grams of a compound of molar mass 125 g/mol in 45 g of camphor

Chemistry
Dissolving solid CaCl2 H2O in a large volume of water is endothermic to the extent of 14.6 kj/mol. Also given: CaCl2(s)+6H2O(l)->CaCl2* 6H2O(s) delta H = -97.0 kj what is the heat of solution of anhydrous CaCl2 in a large volume of water?

Chemistry
Dissolving solid CaCl2 H2O in a large volume of water is endothermic to the extent of 14.6 kj/mol. Also given: CaCl2(s)+6H2O(l)->CaCl2* 6H2O(s) delta H = -97.0 kj what is the heat of solution of anhydrous CaCl2 in a large volume of water?

Chemistry
What is the percent KCL by mass in a 3.00 molal solution?

chemistry
What is the percent KCL by mass in a 3.00 molal solution?

math
Center C has a radius of 13.Chord AB=10. Find the distance from the center of the circle to chord AB. CD=?

geometry
center C has a radius of 13.Chord AB=10.find the distance from the center of the circle to chord AB. CD=?

geometry
T or F two coplanar circles with two points of intersection will have four common tangents?

human bio please help
Skeletal muscles contract when their (A)__________ shorten, using the energy source ATP. A rise in the concentration of (B)__________ ions causes muscle contraction.

please help bio
From the esophagus down, the 6-9 meter long digestive tube is made up of four layers: the inner (A)__________ of epithelial cells, a sub mucosa, smooth muscle, and serosa. Nutrients from the tube are absorbed across the layers into the bloodstream. (B)__________ are circular m...

biology please help
whiich of these fit together A. lipase B. nuclease C. pancreatic amylase D. pepsin bread crumb stuffing butter mashed potatoes turkey

human biology please help
The Golgi body receives proteins from the (A) __________, "packages" those proteins and "ships" them to other areas of the cell, or to the (B) ________ for secretion.

biology PLEASE HELP
The __________ (the cell’s outer border) controls the movement of materials into and out of the cell. It is called a lipid bilayer because of the type of molecules it is made up of and it has two layers

human biology need help
The Golgi body receives proteins from the (A) __________, "packages" those proteins and "ships" them to other areas of the cell, or to the (B) ________ for secretion.

Human biology please help
Sequences of chemical reactions, called metabolic pathways, can be sped up, or catalyzed, by (A) __________ , which are made mostly of (B) ___________.

Calculus
Determine the equation of the inverse function if f(x) = 2x^2+3, and x≥0. The answer is supposed to be f^-1(x)=[√(2x-6)]/2. This is what I did: x=2y^2+3 2y^2=x-3 y^2=(x-3)/2 y=√[(x-3)/2] Did I do something wrong? Thanks!

Calculus
If f(x)= -4x^2+7 and x≤0, what is the equation of the inverse function? The answer is supposed to be f^-1(x)= -[√(7-x)]/2, but this is what I did: x=-4y^2+7 -4y^2=x-7 y^2=(x-7)/-4 y= √[(x-7)/-4] Did I do something wrong? By the way, for the original function,...

math
There are eight shelves. How many soup cans a grocery clerk stack if the bottom shelf has 21 cans and each additional shelf has 2 fewer soup cans than the previous shelf?

math
using the interest formula A=P(1+r/n), solve for the indicated variable. solve for P

Math
Eric has two rock samples. One has a mass of 600 grams and the other has a mass of 1 kg. He recorded the total mass as 7 kg. What did he do wrong? What is the correct answer?

College Cultural Geography
"Respect for traditions that violate human rights is taken by Western universalism as tantamount to disrespect for their victims." What about this part?

College Cultural Geography
Can someone explain what this paragraph is talking about? I do not understand it. "But Western universalism, again, has two faces: it also promotes the principles of liberty and equality throughout the world. It is not possible to proclaim global human rights, on the one ...

physics
A 400 g marble block has a specific heat of 860 J/kg C deg. If the block is placed in 700 ml of water, the marble changes it temperature by 17 Celsius degrees. Since the specific heat of water is known to be 4186 J/kg C deg, what is the temperature change of the water. (The bl...

physics
A wave travels at 575 m/sec in a dense media. The wave is observed to The length of the media is 95.8 cm. When the wave is reflected at the end, its phase is reversed (an upward motion becomes a downward motion.) What is the frequency of the resonant wave in this media?

physics
The speed of sound in air varies with the temperature and humidity of the air. In dry air at 20 degrees Celsius, the speed of sound is approximately 343 m/sec. A closed tube resonates with a node at each end for a sound wave in air. What is the length of tube you would choose ...

Physics
1200kg car moving at 9.72m/s runs into and sticks to a parked 1000kg car. The collision takes 0.15s and after the crash the cars wheels lock and they skid to a stop on the u=0.40 road. what is the distance travelled before skidding to a stop?

Thesis Statement
Weak, because you should mention specifically what is it about your experience with teaching children that you want to write about.

Calculus
Thanks so much Reiny! I never thought of adding the cost to the equation, but now I know.

Calculus
A holding pen for fish is to be made in the form of a rectangular solid with a square base and open top. The base will be slate that costs $4 per square foot and the sides will be glass that costs $5 per square foot. If the volume of the tank must be 50 cubic feet, what dimens...

math
If an apartment complex will need painting in 3 1 2 years and the job will cost $25,000, what amount needs to be deposited into an account now in order to have the necessary funds? The account pays 12% interest compounded semiannually.

physics
How far from Earth will Venus be today?

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