Thursday
April 17, 2014

Posts by Melanie


Total # Posts: 198

Physics
A sound wave in a solid has a frequency of 15.0 kHz and a wavelength of 0.333 m. What would be the wave speed, and how much faster is this speed than the speed of sound in air?

math
on a boat tour there are half as many children there are as adults. ther are 40 people on the tour how many children are there

Math
Write an equation of a line that is parallel to the line y-3=2(x+5) and goes through the point (5,7)

Math
Three minutes after take-off, and airplane is 5,000 feet in the air. If it ascends at a constant rate, what is the rate of change? Please help.

Math
In 3 minutes I can type 192 words. and in 5 minutes I can type 311 minutes. Find how many words I can type per minute. Help please.

Math
Solve each system using the method of your choice. 1. 7x+2y=17 2. 6x-5y=-9 3. y=4x-8 4. y=2x+10 5. 3x-6y=30 6. y=-6x+34 7. 3x+y=5 8. 15x+5y=2 9. 2m=-4n-4 10. 3m+5n=-3 11. 5x+y=0 12. 5x+2y=30 Thank you. (:

Chemistry
A buffer is made from 0.20 M sodium acetate and 0.20 acetic acid. Ka=1.8 x 10^-5. The ph is

Geometry 1
find the distance between K(9,2) AND L(-3,9)to the nearest tenth

chemistry
Consider the following reaction: I2(g) + Cl2(g) 2ICl(g) o Kp = 81.9 at 25 C. Calculate ∆Grxn for the reaction at 25 C under each of the following conditions: a Standard conditions. b At equilibrium. c PICl = 2.55 atm; PI2 = 0.325 atm; PCl2 = 0.221 atm.

Chemistry
Calculate ∆Ssurr when a reaction having each of the following changes in enthalpy: a. ∆Hrxn0 = -287 kJ; 298 K. b. ∆Hrxn0 = 127 kJ; 77 K.

Chemistry
only one of each of the following pairs of reactants undergoes a reaction. Complete and balance the equation for the reaction that occurs. NaCl (aq) + BaCl2 (aq) --> Na2SO4 (aq) + BaCl2 (aq) --> NO3^- (aq) + OH^- (aq)+ Al (s) --> CO3^2- (aq) + OH^- (aq) +Al (s) -->...

pre-calculas
Find the slant asymptote, if any, of the rational function. Do not graph the function. (Enter your answers as a comma-separated list of equations. If an answer does not exist, enter DNE.) f(x) = x2 − 2x + 15 _____________ x + 7

Math
In an experiment with light, Rodney used 6 square polarized filters, 3 in. on a side. What was the total surface area of the filters? Count one face only for each filter.

Physics
Stephanie serves a volleyball from a height of 0.78 m and gives it an initial velocity of +7.7 m/s straight up. How high will the volleyball go? The acceleration of gravity is 9.81 m/s^2. How long will it take the ball to reach its maximum height?

Sociology
The text, Introduction to Sociology, describes many individuals who have contributed to our current view of sociology, including: C. Wright Mills Howard Becker W. I. Thomas Auguste Comte Emile Durkheim Herbert Spencer Karl Marx Erving Goffman’s Harriet Martineau W. E. B. ...

Chemistry
A solution of H2SO4 was electrolyzed using the inert platinum electrodes. A) Write the balanced half-reactions for the anode and cathode in this cell. B) How many coulombs passed through the cell in 90 minutes at 8.0 amperes? C) How many moles of electrons pass through the cel...

math
at the beginning of the summer, conan had $180 in the bank. each week he deposits another $64 that he earns mowing lawns. is his account balance proportional to the number of week since he started mowing lawns?

math
a baseball club has 18 players for every team, with the exception of four teams that have 19 playes each. is the number of players proportional to the number of teams?

Physics
An object is placed 11 cm in front of a convex mirror of focal length 4 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

Statistics
A major department store chain is interested in estimating the average amount its credit card customers spent on their first visit to the chain's new store in the mall. Fifteen credit card accounts were randomly sampled and analyzed with the following results: x = $50.50 a...

Statistics
When testing H0: σ12 = σ22 vs. Ha: σ12 ≠ σ22 two random samples of sizes 10 and 8, respectively, are used. The calculated value of the test statistic is found to be equal to 2.22. Which of the following statements is true? a. H0 must be rejected at &#...

Statistics
When estimating a population mean μ, where the population standard deviation σ is known, we can: a. choose a larger z value, construct a wider confidence interval, and achieve a lower confidence level b. choose a smaller z value, construct a narrower confidence inter...

algebra
Use an associative expression to rewrite the expression (r+43)+s= An equilveant expression is

Physics
A fox fleeing from a hunter encounters a 0.665 m tall fence and attempts to jump it. The fox jumps with an initial velocity of 7.05 m/s at an angle of 45.0°, beginning the jump 2.17 m from the fence. By how much does the fox clear the fence? Treat the fox as a particle.

Physics
An archer wishes to shoot an arrow at a target at eye level a distance of 45.0 m away. If the initial speed imparted to the arrow is 68.2 m/s, what angle should the arrow make with the horizontal as it is being shot?

books
CeCe, I agree with part of your statement but not the statement in its entirety. In Jane Eyre you have two people who some might say were destined to unite. Fate said that no matter what at some point these two would get together. Circumstance stood in the way for both of them...

physics
A car traveling initially at +5.7 m/s acceler- ates uniformly at the rate of +0.79 m/s2 for a distance of 262 m. What is its velocity at the end of the accel- eration? Answer in units of m/s What is its velocity after it accelerates for 132 m? Answer in units of m/s What is it...

physics
With an average acceleration of −0.96 m/s2, how long will it take a cyclist to bring a bicycle with an initial speed of 14.8 m/s to a complete stop? Answer in units of s

physics
A window washer drops a brush from a scaf- fold on a tall office building. What is the speed of the falling brush after 2.7 s? (Neglect drag forces.) The acceleration due to gravity is 9.8 m/s2 . Answer in units of m/s How far has it fallen in that time? answer in units of m

physics
A car travels along a straight stretch of road. It proceeds for 11.9 mi at 58 mi/h, then 29.4 mi at 44 mi/h, and finally 36.9 mi at 31.6 mi/h. What is the car’s average velocity during the entire trip? Answer in units of mi/h

Physics
A ball is thrown straight up and reaches a maximum height of 6.71 m. What was its initial speed? The accelera- tion of gravity is 9.8 m/s2 . Answer in units of m/s please give right answer and explain how you got it, thanks !

Physics
Judy, by chance, spots a potted plant falling outside the window at 2.88 m/s . Further down the same building, Judy’s boyfriend clocks the pot at 54 m/s . How far apart are the friends? The acceler- ation of gravity is 9.8 m/s2 . Answer in units of m Please give right ans...

Physics
1) A physics book is moved once around the perimeter of a table of dimensions 1 m by 3 m. What is the distance traveled? 2) A window washer drops a brush from a scaf- fold on a tall office building. What is the speed of the falling brush after 2.7 s? (Neglect drag forces.) The...

math
suppose that sin0=-5/13 and that 0 is a quadrant III angle. what is the exact value of cos0

Math
for function f(x)=(x)/x^2-4. 1. State the vertical and horizontal asymtopes. 2. Graph this function.

math
A drawer contains 4 red socks, 3 white socks, and 3 blue socks. without looking, you select a sock at random, replace it and seect a sond sock at random. what is the probablity that the first sock is blue and the second sock is red?

Calculus
The question will first read in English followed by a reading in French. *************************************** If alpha + 2 beta = pi/4 AND tan beta = 1/3. What would tan alpha mesure? (Keep in mind that pi/4 is the same as 45 degrees.) Si alpha + 2 beta = pi/4 ET tan beta =...

PHY103
Write 2 arguments in english, one in the form of modus ponens and one in form of modus tollens. Then write the arguments in symbols using sentence letters and truth functional connectives. What advantages does being able to symbolize our arguments provide? Are there disadvanta...

Chemistry
How much CuSO4.5H20 would you need to prepare 6 grams of copper ammine complex, [Cu(NH3)]SO4.H20? There is only 1 ammonia molecule in the copper ammine complex. please answer asap, thanks!

Algebra
evaluate the function f(r)= sqrt25-r-6 at the given values of independent variables f(16), f(-x), f(25-2x) and simplify

Algebra
evaluate the function f(r)= sqrt25-r-6 at the given values of independent variables f(16), f(-x), f(25-2x) and simplify

HSPA REVIEW
-Clue 1: I am a Real Number whose value is less than 1 -Clue 2: I do not end -Clue 3: My digits do not repeat. what kind of number am i?

7th grade science
five facts about the stoges of photosynthesis

geometry
an electronic manufacturer wants to ship a stereo system. The system includes the following components: 1 Receiver 20in. x 8in. 1 CD Player 20in. x 8in. x 5in. 1 Dual Tape Deck 20in. x 8in. x 6in. 2 Half-Cylinder Speakers, each with a height of 22 in. and a radius of 4 in. To ...

chemistry
If you burn 38.9 g of hydrogen and produce 348 g of water, how much oxygen is reacted?

chemistry
If you burn 38.9 g of hydrogen and produce 348 g of water, how much oxygen is reacted?

geometry
Did you get 200 for this particular problem? cause that's what I got, which doesn't make sense to me because it's suppose to be less than 120 since it's the smaller polygon

geometry
How do you find the perimeter of a second polygon given just the scale factor of both polygons and the perimeter of the larger polygon? The problem is Two similar polygons have a scale factor of 3:5. The perimeter of the large polygon is 120 feet. Find the perimeter of the sma...

math
Cheryl is training for a long bicycle ride. Jim will drive Cheryl back and her bicycle 60 miles from town, drop them off, and then drive back to town. Cheryl then will ride her bicycle back to town. On the way back to town, Jim will travel at 50 miles per hour and Cheryl will ...

math
daniel collects $87.00 by selling paperback books for $0.50 each and hardcover for $4.00 each. let p be the number of paperback books he sells and h be the number of hardcover books he sells write an equation to represent this situation.

math
58 - 16= 42 42/6 = 7

math
jamie is saving money to buy a cd player that will cost $58, including tax. she has already saved $16. she can earn $6 per hour doing yard work. how many hours will jamie need to work to earn enough money to buy the cd player?

Business
#14 is B WTO #16 is A Perfect Competition

math
let fbe a function that is even and continuous on the closed interval [0,3]. the function f and itsderivatives have the properties indicated in the table below. sketch the graph. x 0 0<x<1 1 1<x<2 2 2<x<3 f(x) 1 (+) 0 (-) -1 (-) f’(x) DNE (-) 0 (-) DNE (...

math
(x^3+7x+12)/(x-4) find: x intercepts vertical asymptotes horizontal/slant asymptotes derivative second derivative increasing interval decreasing interval concave up interval concave down interval

math
f(x)=x/(x^2+x-2) find: x intercepts vertical asymptotes horizontal/slant asymptotes derivative second derivative increasing interval decreasing interval concave up interval concave down interval

math
f(x)=x^3+6x^2+9x find: x intercepts vertical asymptotes horizontal/slant asymptotes derivative second derivative increasing interval decreasing interval concave up interval concave down interval

Anatomy and Physiology
Discussion Topic: Chemistry of Life, Cells, and Tissues Select an organ and provide an example of how it uses the following: carbohydrates, lipids, proteins, and nucleic acids. Also, describe an area of interest related to one of the types of molecules, for example, cholestero...

Anatomy and Physiology
Discussion Topic: Chemistry of Life, Cells, and Tissues Select an organ and provide an example of how it uses the following: carbohydrates, lipids, proteins, and nucleic acids. Also, describe an area of interest related to one of the types of molecules, for example, cholestero...

physics
A string under a tension of 43 N is used to whirl a rock in a horizontal circle of radius 3.3 m at a speed of 26.46 m/s. The string is pulled in, and the speed of the rock increases. When the string is 0.635 m long and the speed of the rock is 80.5 m/s, the string breaks. What...

A=LxW
Length of a rectangle is 13 cm less than 5 times it's width. Its area is 28 square cm. Find dimensions of rectangle

Geometry
how do you find the orthocenter of a triangle with the vertices A(4,0) B(-2,4) C(0,6)? Please explain to me how you get x after doing point slope form for the two slopes.

chemisty
give the conjugate base for HNO2

geometry
never mind...i understand

geometry
Hey Steve, Thanks....but how could it be -4?

geometry
what is the orthocenter of triangle with the vertices of X(-11,0), Y(-11,-8), Z(-1,-4)?

Reading
i think it is line 14

Psychology
How do the ideas of positive psychology differ from the traditional model of illness?

science
The physical properties of carbon vary widely with the allotropic form.

Uni Math
Simplify and state the domain: x'2 +1 . x'2 - 9 x'2 + 2x – 3 x'2 – 2x -3

Geometry. Please help.
1. The complement of an angle is 10 degrees less than the angle itself. Find the angle and it's complement. Find the perimeter and area of the following figures with the vertices given: a) A (3, 5) B (3, 1) C (0, 1) b) Q (-3, 2) R (1, 2) S (1, -4) T (-3,-4) c) G (-4, 1) H ...

Geometry. Please help.
Thank you!!!(= I get it now

Geometry. Please help.
1) Two angles are complementary. The measure of one angle is 21 more than twice the measure of the other angle. Find the measure of the angles. 2) If a supplement of an angle has a measure 78 less than the measure of the angle, what are the measures of the angles? Please don&#...

physical science
what is the freezing point depression when 153g of bromine is added to 1000g of benzene?

physical science
what is the freezing point depression when 153g of bromine is added to 1000g of benzene?

physical science
what is the freezing point depression when 153g of bromide is added to 1000g of benzene?

Pen Foster
checking my answers in Introduction to Allied Health anyone have that one?

algebra
So the answer would be to be able to pay 89.09 more a month.

Algebra
Evaluate log36(1/6) I believe the answer is -.5 but I just wanted to check to make sure I was doing this correctly. Thank you!

Algebra
Thank you - that is exactly what I thought!

Algebra
I think this is a easy trick question, so I probably know the answer but I just wanted to double check. What is the domain and range of the function f(x) = 3^x Find the f^-1 and its domain and range? Thanks for your help.

algebra
Suppose a sample of Cesium-137 with initial mass of 200 grams decays to a mass of 160 grams voer the course of 10 years. Find the half-life of Cesium-137 (Round to the nearest year) How much Cesium-137 is left in the sample after 60 years? Round to the nearest tenth of a gram.

chemistry
what is the volume of a rectangle that has a mass of 19.0 and a density of 10.50 g/mL

College Algebra
Thank you bobpursley!

College Algebra
A farmer has 100 yeards of fencing with which to enclose two adjacent rectangular pens both bordering a river. The farmer does not need to fence the side with the river. What should the dimensions of the two pens together (a rectangle) be in order to yield the largest possible...

Chemistry
How many grams are in 8.2x10 to the power of 22 molecules of Fe2O3?

math
A partial payment is made on the date(s) indicated. Use the United States Rule to determine the balance due on the note at the date of maturity. (The Effective Date is the date the note was written.) Assume the year is not a leap year. P $1900, R 6%, effective date april 10, m...

Empirical Probability
Explain how empirical probability can be used to determine whether a die is “loaded” (not a fair die).

Chemistry
Which shows 15/c9d3 in simplified radical form with the smallest possible index?

Science
There's a grauph and obove the grauph it says gravity (mass movement) and then it says pg 67 69 and i dentify 4

MP Marking
It stands for maylin products.. I have a ring with same MP.. And I've. Been on google tryin to find out more info

MP Marking
It stands for maylin products.. I have a ring with same MP.. And I've. Been on google tryin to find out more info

chemistry
At room temperature, 20° C, water (H2O) is a liquid and oxygen (O2) is a gas. Based on kinetic molecular theory, which answer best explains the states of the two fluids?

Science PLEASE HELP!!
Relate the function of the following protist structures to human organs with similar functions: a)nucleus b)contractile vacuole c)food vacuole

chemistry
Calculate how many mL of the 5% w/v AgNO3* solution must be added to 0.4020g of the sample to precipitate all the chloride. Assume the sample is NaCl. * this means tat there are 5 grams of silver nitrate present per 100ml of solution.

math
Algebra:Functions Tell whether each represents a function. Explain. Area=LenghtxWidth

Chemistry
What happens if a student adds distilled water to a flask before starting the titration?

Chemistry
What happens when NaOH has been sitting for a couple of days without cover before starting the titration?

Math
Yeah that's what I thought. But I wasn't sure which was greater, the larger exponent or the smaller one. It's kinda confusing when your dealing with decimals and negative exponents. But thankss :)

Math
Which expression represents the larger number? A. 40.1 x 10 to the -6 power B. 4.1 x 10 to the -7 power C. 0.411 x 10 to the -6 power D. 0.04001 x 10 to the -5 power I got A, but I'm not quite sure if it's the right answer :/

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