Friday

August 29, 2014

August 29, 2014

Total # Posts: 2,372

**statstics**

a report says 65% of vechiles sold were SUV's. A random sample of 100 vechiles sold in last month is taken. Use the central limit theorem, find the probability that most 70% of the vechiles in the sample were SUV's
*August 25, 2014*

**algebra**

what is the equation of a parabola whose vertex is (6,0) and whose graph is half as tall as y=x^2 and opens upside down
*August 23, 2014*

**statistics**

You want to estimate the difference in grade point averages between two groups of university students to be accurate within 0.2 grade point, with probability approximately equal to 0.95. If the standard deviation of the grade point measurements is approximately equal to 0.6, ...
*August 13, 2014*

**College English**

disunity or lack of confederation amongst various tribes caused considerable weakness in their profile as "THE" indian nation as WHOLE... thus they were dismembered and placed on reservations.. by 1825 the last major tribes were sent across the MISSISSIPPI RIVER.. ...
*July 28, 2014*

**statistics**

the daily milk production for a certain type of dairy cow has a mean of 43 pounds per day with a standard diviation of 5 pounds per day. Suppose this daily mild production has a normal distribution. Calculate the probability that a randomly selected cow of this type has a ...
*July 17, 2014*

**Calculus**

Thank you so just to clarify for a) all you did was take the integral of the acceleration to get your v(t) function. Then for b) do you set v=2+3t equal to 14? c)You just take the integral of v(t) to get position function I think.
*July 6, 2014*

**Calculus**

A particle moves with a fixed acceleration of 3 m/s^2. If its initial velocity is v(0)= 2 m/s, and its initial displacement is s(0)= 0 A)Find its velocity function v(t) B)How long does it take for the particle to reach the velocity 14 m/s? C)Find the distance traveled when its...
*July 6, 2014*

**math**

convert y=2x^2+5x-5 into vertex form
*July 4, 2014*

**AP Macroeconomics**

nobody likes you :(
*July 3, 2014*

**Calculus**

Given f(x) = csc^4(5x^2-3x+1), find f'(x). Show all work.
*June 23, 2014*

**English**

I need to find a sensationalised news article homework a and then highlight sensational parts please help'!!!
*June 21, 2014*

**math**

Perform a one-way ANOVA analysis, testing at the 0.05 level. Also, calculate the mean number of sick days for each group. Describe your results. . Group Sick days per year Placebo: 7, 4, 6, 8, 6, 6, 2, 9 Flu Shot 1: 5, 3, 3, 5, 4, 7, 3, 3 Flu Shot 2: 2, 4, 1, 2, 2, 1, 2, 5
*June 21, 2014*

**Statistics**

I began to think of the binomial distribution with the common heads or tails coin flipping experiment example...I believe my question in #3 is related to that, and in fact I think the generalization is what applies, the "multinomial" distribution...any thoughts from ...
*June 12, 2014*

**Statistics**

You have these 10 observations of some event X: 1.03 1.022 1.022 1.01 1.026 1.02 0.95 1.005 1.05 1.023 Here is the sorted list from least to greatest: 0.95 1.005 1.01 1.02 1.022 1.022 1.023 1.026 1.03 1.05 Based on this data alone: 1) It makes sense to say P(X <= 0.95) = 1/...
*June 12, 2014*

**Pre algebra**

Sophie has 5 pieces of string that are 4 yards each. She uses 3 pieces that are each 3 feet long. How much string does Sophie have left?
*June 8, 2014*

**Physics**

. A rock is thrown up into the air with an initial velocity of 15m/s up. What is the rock's velocity after 0.40 seconds?
*June 8, 2014*

**Chemistry**

a) Which of the following reagents would oxidize Zn to Zn2 , but not Ag to Ag ? Answers are: Co2+ Ca2+ Br2- Br2 Co or Ca b) Which of the following reagents would oxidize Ag to Ag , but not Cl– to Cl2? Answers are: Co Br- Br2 Co2+ Ca2+ or Ca
*June 2, 2014*

**Geometry**

Need help solving this problem so confused The tries of an automobile have a diameter of 22 inches. If the wheels revolve ten times, how far does the automobile move? Round your answer to the nearest tenth of a foot and show your work
*May 29, 2014*

**Chemistry**

The mechanism for the reaction described by No2+CO--->CO2+NO is suggested to be (1)2NO2--->NO3+NO (2)NO3+CO--->NO2+CO2 Assuming that [NO3] is governed by steady-state conditions, derive the rate law for the production of CO2(g) and enter it in the space below. rate of...
*May 23, 2014*

**algebra**

i'm thinking of two numbers, x and y. The sum of 4x and 1 is y. The sum of y and twice x is 13. Find x and y.
*May 21, 2014*

**physics**

A fire hose exerts a force on the person holding it. This is because the water accelerates as it goes from the hose through the nozzle. How much force is required to hold a 7.5 cm diameter hose delivering 450 L/min through a 0.80cm diameter nozzle?
*May 20, 2014*

**algebra**

I have 8 cups of a juice drink consisdting of 25% oj and 75% apple juice. I want to make a mix with 40% oj. how many cups of oj must I add?
*May 19, 2014*

**Physics**

A yo-yo is spun from rest by pulling on the string with a constant tension of 2.0 N. The radius of the inner rod on which the string is strung round is 0.50 cm. The tension is applied for 5.0 seconds after which the yo-yo is observed to spin with an angular velocity of 15 rad/...
*May 18, 2014*

**MAT 201**

The number of vacation days taken by employees of a company is normally distributed with a mean of 14 days and a standard deviation of 3 days. For the next employee, what is the probability that the number of days of vacation taken is less than 10 days? More than 21 days?
*May 15, 2014*

**statistics**

The number of vacation days taken by employees of a company is normally distributed with a mean of 14 days and a standard deviation of 3 days. For the next employee, what is the probability that the number of days of vacation taken is less than 10 days? More than 21 days?
*May 15, 2014*

**Geometry**

How to foil 2xsquared - x - 15=0
*May 14, 2014*

**pre cal **

For a normal curve, what percentage of values falls beyond two standard deviations from the mean?
*May 12, 2014*

**Maths**

Find the exact value of cos^2(15°)-cos^2(30°)+cos^2(45°)-cos^2(60°)+cos^2(75°)
*May 9, 2014*

**Chemistry**

Nevermind I figured it out its: 2SO3^2- + 2H2O + 2e^- ---> S2O4^2- + 4OH^-
*May 4, 2014*

**Chemistry**

Is it: H2O + SO3^2- ---> SO4^2- +2H^+ + 3e^-
*May 4, 2014*

**Chemistry**

Balance the following equation for a half reaction that occurs in basic solution. Use e– as the symbol for an electron. SO3^2- ---> S2O4^2-
*May 4, 2014*

**Chemistry**

Thanks a lot i figured this one out too its: 2H2O + MnO2 + 3Cu^2+ ----> MnO4^- + 3Cu^+ + 4H^+
*May 4, 2014*

**Chemistry**

This is how I am doing it: 1. break up into half reactions MnO2--->MnO4 and Cu^2+ ---> Cu^+ 2. add H20, H+, and e- to both sides and I get: 2H2O + MnO2 ---> MnO4 + 4H + 8e^- and e^- + Cu^2+ ----> Cu^+ then adding them I get: 2H2O + MnO2 + Cu^2+ ---> MnO4 + Cu...
*May 4, 2014*

**Chemistry**

In a particular redox reaction, MnO2 is oxidized to MnO4– and Cu2 is reduced to Cu . Complete and balance the equation for this reaction in acidic solution. Phases are optional. MnO2 + Cu^2+ ---> MnO4^- + Cu^+
*May 4, 2014*

**English Literature**

THANK YOU SO MUCH
*May 1, 2014*

**English Literature**

We have just finished reading Poe's "The Fall of the House of Usher" and I need to explain, in a paragraph what "Roderick is all mind in a weak body" means. I think it's somehere along the lines of his spirit being alive but his exterior being dead...
*May 1, 2014*

**chemistry**

if 7 moles O2 are used, houch energy is produced?
*April 30, 2014*

**french**

unscramble - qobusteiu
*April 29, 2014*

**Chemistry**

How do you calculate ΔSfus and ΔSvap for HCl given melting point,ΔHfus, boiling point, and ΔHvap also how do you determine the entropy change when 5.20 mol of HCl(l) freezes at atmospheric pressure.
*April 25, 2014*

**Chemistry**

The following equation represents the decomposition of a generic diatomic element in its standard state. (1/2)X2(g)--->X(g) Assume that the standard molar Gibbs energy of formation of X(g) is 5.45 kJ·mol–1 at 2000. K and –64.30 kJ·mol–1 at 3000...
*April 25, 2014*

**Chemistry**

Ok thanks a bunch!
*April 24, 2014*

**Chemistry**

how do you find lnQ?
*April 24, 2014*

**Chemistry**

For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 bar for all species. For the reaction C2H6(g)+H2(g)---->2CH4 the standard change in Gibbs free energy is ΔG° = -32.8 kJ/mol. What is ΔG for this reaction at 298 K when the ...
*April 24, 2014*

**Chemistry**

A critical reaction in the production of energy to do work or drive chemical reactions in biological systems is the hydrolysis of adenosine triphosphate, ATP, to adenosine diphosphate, ADP, as described by ATP(aq) +H2O (l) --->ADP(aq) +HPO4^2- for which ΔG°rxn = &#...
*April 24, 2014*

**math**

the drawing below measures 7.8 cm by 6.2 cm what is the perimeter in meters? scale 1cm=10m the drawing is square
*April 24, 2014*

**science 1 question**

ocean trenches are formed when the denser oceanic plate sinks
*April 23, 2014*

**econ**

You want to determine the profit-maximizing production quantity for a monopolist. You can ask the firm's consultant to draw the firm's revenue and cost curves, but each curve would cost you $1,000. From the following list indicate which curves you will request and why...
*April 12, 2014*

**Macroeconomics**

I need help to answer this question? You want to determine the profit-maximizing production quantity for a monopolist. You can ask the firm's consultant to draw the firm's revenue and cost curves, but each curve would cost you $1,000. From the following list indicate ...
*April 12, 2014*

**Health**

A pound of butter since butter has more fat than lean meat does.
*April 3, 2014*

**Health**

Which would produce a greater number of Calories- a pound of lean meat or a pound of butter? Why is it so?
*April 3, 2014*

**Math**

The entrance hall to the Louvre Museum in Paris is a glass and metal pyramid with a surface area of approximately 1980 square on each side . The base of the pyramid is a square that is 35.4 meters on each side. What is the slant height of the pyramid ? Round to the nearest ...
*April 2, 2014*

**science(check answers)**

4 is C. and 5 is true.
*March 31, 2014*

**Algebra 1**

Hi! I'm doing my math homework, but I got confused. Can someone please help me how to solve simplest radical forms with an example? With square roots?
*March 20, 2014*

**Computers**

System A consists of a single ring with 100 stations, one per repeater. System B consists of four 25 stations rings linked by a bridge. If the probability of a link failure is , a repeater failure is , and a bridge failure is , derive an expression for parts (a) to (e). 50 ...
*March 17, 2014*

**Calculusmath**

what is an equation of the conic section x^2+y^2=16 after a rotation of 45 degrees about the origin. A. (x')^2+(y')^2=16 B. (x')^2- (y')^2=16 C. (x')^2- 2x'y'+(y')^2=16 D. (x')^2+ 2x'y'+(y')^2=16
*March 12, 2014*

**science(check answers)**

b b d a
*March 11, 2014*

**chemistry**

Phosphoric acid is a triprotic acid, so H3PO4, H2PO4 -, and HPO4 2- are all acids. Which of the solutions below would have the lowest pH? 0.1 M NaH2PO4 0.1 M Na2HPO4 0.1 M Na3PO4
*March 10, 2014*

**Physics**

A train 500 m long is moving on a straight track with a speed of 84.2 km/h. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 16.4 km/h. Assuming constant acceleration, determine how long the train blocked the crossing....
*March 5, 2014*

**Physics**

Does it take twice the work to stretch a spring 2cm from its equilibrium position as it does to stretch it 1cm from its equilibrium position?
*March 5, 2014*

**Science**

1.a 9.d 10.c
*March 5, 2014*

**math 4**

40 cm and 40 in
*March 3, 2014*

**computers**

1. It is important to include voice and point of view in writing because (1 point) A. It helps the reader understand the characters feelings and emotions B. It adds more words to the story C. It makes the information stand out D. It makes the story more important 2. A venn ...
*March 3, 2014*

**social studies**

do ur own homwurk
*February 23, 2014*

**ecology**

If you observe no changes in gene frequencies in a population over several generations, can you conclude that the population is not subject to natural selection?
*February 20, 2014*

**English**

If I wanted to search romanticism I would have done it, but I was hoping someone who already knows about it could help push me in the right direction/give me something to go on.
*February 20, 2014*

**English**

What was poetry like during the Romantic period? Discuss three characteristics of Romanticism. I'm looking for 1-2 sentences for the first question, and maybe 3-6 for the second question. Thank you so much to anyone who helps. Any help is appreciated. :)
*February 20, 2014*

**Chemistry**

A 150.0 mL sample of a 1.50 M solution of CuSO4 is mixed with a 150.0 mL sample of 3.00 M KOH in a coffee cup calorimeter. The temperature of both solutions and the calorimeter was 25.2°C before mixing and 31.3°C after mixing. The heat capacity of the calorimeter is 24...
*February 18, 2014*

**math**

A manufacturer produces a 4-cup and 8-cup coffee maker. The 4-cup maker takes 6 hours to produce and the 8-cup takes 9 hours. The manufacturer has at most 500 hours of labor per week. a. Write an inequality to represent the number of each type of coffee makers they can produce...
*February 17, 2014*

**science**

1.What two things happen to particles in a substance when the substance is heated? 2. What are the three most common states of matter on Earth? 3. Why does a liquid take the shape of whatever container it is in but does not expand to fill the container completely? 4. A certain...
*February 8, 2014*

**math**

Oregon is about 400 miles from west to east, and 300 miles from north to south. If the image of Oregon on a map is 15 inches tall (form north to south), about how wide is the image of Oregon on the map?
*February 6, 2014*

**Help with science**

5 c 7 c
*February 3, 2014*

**physics**

ind the force of gravity between a newborn baby (mass = 2.9kg ) and the planet Mars (mass = 6.4×10^23kg), when Mars is at its closest to Earth (distance = 5.6×10^10m).
*February 2, 2014*

**physics**

Find the force of gravity between a newborn baby (mass = 2.9kg ) and the planet Mars (mass = 6.4×1023kg), when Mars is at its closest to Earth (distance = 5.6×1010m).
*February 2, 2014*

**algebra**

The perimeter of a pool is 64 feet and has a width of x and a length of x-4. Write an equation and find both the width and length of the pool.
*February 1, 2014*

**Chemistry**

Calculate the enthalpy change of formation for the following reactions using Hess's law, and the enthalpies of formation given in Figure 4: b) MgO +2HCl --> MgCl2 +H2O c)NaOH+ HCl -->NaCl +H20 Figure4: the given enthalpies of formation compound values are: Mg(OH)2 is...
*January 30, 2014*

**Physics**

UCSC?
*January 29, 2014*

**Physics**

For a rotating object the equation for acceleration is a = v^2 / r. The force is F = m*a = m*v^2 / r. The force in this problem is the coulomb force. F = k*3q*q / r^2 = m*v^2 / r Since the kinetic energy is just m*v^2 / 2, and that's all we need, let's multiply both ...
*January 27, 2014*

**Chemistry**

Water is composed of 11.2% hydrogen and 88.8% oxygen. what mass of water contains 50.0g of 0xygen?
*January 27, 2014*

**Physics**

What is the frequency of a blue light with a wavelength of 489 nm
*January 26, 2014*

**chemistry**

An unknown substance has a mass of 28.1 g. The temperature of the substance increases by 16.3 degrees Celsius when 176 J of heat is added to the substance. What is the most likely identity of the substance? The table lists the specific heat capacities of select substances.
*January 26, 2014*

**algebra 1**

A gardner is calculating the perimeter of a rectangular garden, which has a length of 25 feet. The area of the garden is 400 square feet. What is the perimeter of the garden? Write the equation: could it be this? p=400/25+400/25+25+25
*January 22, 2014*

**Algebra 1**

ok thanks
*January 22, 2014*

**Algebra 1**

A jacket costs $45. It is on sale for 20% off. What is the price of the new jacket? Write the equation.
*January 22, 2014*

**Physics**

A spring with a force constant of 5.4 N/m has a relaxed length of 2.63 m. When a mass is attached to the end of the spring and allowed to come to rest, the vertical length of the spring is 3.64 m. Calculate the elastic potential energy stored in the spring. Answer in units of ...
*January 22, 2014*

**Algebra 1**

Two students are absent. This is 1/8 of the entire class. How many students are in the entire class? Write the equation: How would you write an equation?
*January 22, 2014*

**Algebra 1**

thanks
*January 22, 2014*

**Algebra 1**

Two students are absent. This is 1/8 of the entire class. How many students are in the entire class? Write the equation: How would you write an equation?
*January 22, 2014*

**Eng 2**

Which phrase best describes this type of sentence? Sandy creates her best pieces of art late in the day. A) prepositional phrase modifying an adverb B) adverb modifying other adverbs C) prepositional phrase modifying other prepositional phrases D) preposition with compound ...
*January 21, 2014*

**Math**

I HAD THIS QUESTION TOO. ITS !@#$%^&ING 13mm
*January 21, 2014*

**MATH**

Find the exact values. (a) tan(π/3) = ? (b) sin(7π/6) = ? (c) sec(5π/3)= ?
*January 19, 2014*

**Math**

Rewrite by completing the square x2 + x + 1
*January 17, 2014*

**Math**

Given the line 4x - 3y = 12, what is the distance between it and the origin I know the answer is 2.4 but how do u do it
*January 16, 2014*

**5th grade math**

A.. Because then number after 1 have to multiply the previous number (1) so 1*1=1. Then it subtracts the previous number 1-1=0. So the list would be 1,0,0,0,0 so on... So A is incorrect
*January 15, 2014*

**Math**

Which method did u use? I don't know if there is a faster way of doing it then what I'm doing
*January 15, 2014*

**Math**

Given the line 4x - 3y = 12, what is the distance between it and the origin Is it 2.4?
*January 15, 2014*

**science**

IS PLUTO A PLANET...
*January 15, 2014*

**math crctprep**

The Jones family drove a total of 3584 miles in 9 days. They drove the same number of miles each day. Which of the following is closest to the number of miles they drove each day?
*January 15, 2014*

**Math**

Someone help please
*January 10, 2014*

**Math**

if a b and c are constants and (x+2)(x+b)= x^2+cx+6, what is c
*January 10, 2014*

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