Sunday

December 11, 2016
Total # Posts: 994

**Statistics**

If the population is normally distribution then the sample must be normally distributed even for small sample size? True or False. The variance of the standard normal distribution is always equal to 1.? True or False. A continuous random variable may not be normally ...

*February 7, 2014*

**Statistics**

A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform ...

*February 7, 2014*

**Statistics**

A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform ...

*February 7, 2014*

**physics**

One gram of nickel has 1.026 × 1022 atoms, and each nickel atom has 28 electrons. How many electrons are contained in 6.00 g of nickel? The elemental charge is 1.6 × 10−19 C. Answer in units of electrons

*February 7, 2014*

**chemistry**

2)Tf = (0.00089 +/- 0.00008) * (13 +/- 2) + (19.627 +/- 0.004) Tf = (0.012 +/- 0.002) + (19.627 +/- 0.004) Tf = 19.639 +/- what value?

*February 7, 2014*

**physics Work unit**

1. A football player pushes a tackle dummy forwards at a constant 0.85m/s for 11m using 7150J of energy. The tackling dummy mass is 120kg. a) find force the player exerts? b) what is the frictional force the dummy exerts? c) what work is done by the friction as the dummy is ...

*February 1, 2014*

**Physics Work unit**

1. A football player pushes a tackle dummy forwards at a constant 0.85m/s for 11m using 7150J of energy. The tackling dummy mass is 120kg. a) find force the player exerts? b) what is the frictional force the dummy exerts? c) what work is done by the friction as the dummy is ...

*February 1, 2014*

**Math**

4 because l.c.m. of 6 & 8

*January 28, 2014*

**Chem**

Calculate the pH of a solution obtained by mixing 50 mL of 0.75 M CH3COOH with 15 mL of 1.6 M NaOH. (Ka of CH3COOH is 1.8 x 10-5)

*January 23, 2014*

**Elementary Math**

I just told my little boy to do 15.4 x .7 and he got 10.78

*January 2, 2014*

**Math**

Thanks so much!!

*December 10, 2013*

**Math**

Sugar comes in 2 pound bags and flour comes in 5 lb bags. Thomas bought 3 more bag of sugar than flour and the total weight was 48 pounds. How many bags of sugar and flour did Thomas buy?

*December 10, 2013*

**Physics**

A. 0.60 B. 20.69 C. 0.048

*December 10, 2013*

**math**

A statistic professor plans classes so carefully that the lengths of her classes are uniformly distributed between 46.0 and 56.0 minutes. Find the probability that a given class period time is less than 51.75 minutes

*November 29, 2013*

**Statistics**

A statistics professor plans her classes so carefully that the lengths of her class are uniformly distributed between 46.0 and 56.0 minutes. Find the probablity that given class period runs less than 51.75 minutes

*November 27, 2013*

**Algebra 1 (Reiny or Kuai)**

jason wants to buy his brother a comic book. If he buys it online it costs $3.50, but if he buys it in the store there is a 20% markup. How much does the comic book cost in the store?

*November 4, 2013*

**Math**

1/4

*October 29, 2013*

**edu 650**

The idea of Gardener’s theory of multiple intelligences suggests that there are specific intelligences that are inherent in all individuals. The author, however, suggests that a preferred style may not necessarily be the best way an individual learns. With that in mind, ...

*October 21, 2013*

**Math**

A baseball pitcher has pitched a total of 25 innings so far during the season and has allowed 18 runs. At this rate, how many runs, to the nearest hundredth, would he allow in nine innings? This number is called the pitcher’s earned run average, or ERA. b. Randy Johnson ...

*October 7, 2013*

**Chemistry**

I am trying to figure out the molecular, ionic, and net equation for this question. HCl reacts with the precipitate formed from mixing Ni(NO3)2 and NaOH . This is what I got for the molecular but it is saying it wrong. Please help. Thank you. HCl(aq) + Ni(NO3)2(aq) + NaOH(aq...

*October 5, 2013*

**Math HELP!!**

The water level of a lake decreases by 6 inches over 3 years. What is the mean yearly change in the water level?

*September 23, 2013*

**health help!!!!!!**

should be c

*September 12, 2013*

**Chemistry**

Please explain how what the X g NaCl should be? I am not following this completely! Thanks I got the answer for mass of H20 to be 9.337*10^23 g

*September 8, 2013*

**Chemistry**

If the volume of ocean water 7.41*10^20 L contains 2.9 percent sodium chloride ("salt") by mass and the density of the water is 1.26 g/mL, calculate the total mass of sodium chloride. (1 ton = 2000 lb, 1 lb = 453.6 g) Calculate the mass of sodium chloride in kg

*September 8, 2013*

**algebra**

when sandy looked out at the school parking lot,she noticed that for ever 9 minivans there were 5 other types of vehicles.If there were 168 vehicles in the parking lot,how many of them are not minivans?

*August 27, 2013*

**Physics**

A uniform beam of length L = 7.80 m and weight 4.05 102 N is carried by two workers, Sam and Joe, as shown in the figure below. Determine the force that each person exerts on the beam. (Sam is 1m from one end of beam and joe is 2m from the opposite end.)

*July 30, 2013*

**CHEM**

how many moles of oxygen are present in 11.0 molecules of NaClO4? AND HOW DO I WORK IT OUT

*July 18, 2013*

**math**

3/4-1/2n=4/5 Please don't give me the answer, just show me the steps to solve it

*July 15, 2013*

**math**

-6=4x/7+2

*July 15, 2013*

**algebra**

perform the subtraction (8a+2b)/(8a^(2)+2ab-3b^(2))-(a+2b)/(16a^(2)-ab^(2))

*July 5, 2013*

**Physics**

A 39.2-kg boy, riding a 2.39-kg skateboard at a velocity of +4.97 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.48 m/s, 9.54° above the horizontal. Ignore any ...

*June 30, 2013*

**health**

how do you lose weight

*June 27, 2013*

**math**

Yes, painting can be 12 to 14 inches . Lengths do not matter . Thank you

*June 2, 2013*

**math**

Want to hang a painting on a wall that is 17and 5/8 inches high and I want 2 inches left on top and bottom of painting showing. Where would I hang it at?

*June 2, 2013*

**Chemistry**

Say you have a question asking to rank the oxidizing strength of several different metals. When you look at the reduction table to determine the strength, there are metals with different oxidation states. For example: Fe3+ + 3e- => Fe ; Eo = -.04 Fe2+ + 2e- => Fe ; Eo...

*May 21, 2013*

**Math**

A squirrel is moving at a speed of 15 feet per second. At this rate, how long will it take the squirrel to travel one mile? Convert answer into minutes, to the nearest tenth.

*May 9, 2013*

**algebra**

A satellite dish has a parabolic cross section and is 6 ft deep. The focus is 4 ft from the vertex. Find the width of the satellite dish at the opening. Round your answer to the nearest foot. Thank you

*May 1, 2013*

**Math**

He was not late to the bus stop because 8:15 is just the digital way to say quarter after 8

*April 22, 2013*

**Statistics**

A high school counselor is interested in the percentage of students who will be going to college. She randomly picks 60 students and finds that 53 will be going to college. Use a 95% confidence level to find the population proportion. a) State the 95% confidence interval for ...

*April 17, 2013*

**Statistics**

A purchasing agent at the Kelly Bread Company wants to estimate the mean daily usage of rye flour. She takes a sample for 50 straight days and finds that the sample mean is 180 pounds with a sample standard deviation of 38.5 pounds. a) State the 90% confidence interval for the...

*April 16, 2013*

**Chemistry**

I followed your direction and I calculated the solubility to be 40. Am I correct?

*April 16, 2013*

**Chemistry**

Consider the following reaction that describes the solubility equilibria of solid Zn(OH)2 in aqueous solution (Ksp of Zn(OH)2 4.0x10^-17. Calculate molar solubility of Zn(OH)s in an acidic solution of pH5.0.

*April 16, 2013*

**chemistry**

To maintain the effectiveness of a buffer, relative concentrations of the acid and the conjugate base should not differ by a factor of 10. Based on this information, derive pH range within which the buffer can work effectively. I know that I have to use the HH equation, but I ...

*April 16, 2013*

**chemistry**

To maintain the effectiveness of a buffer, relative concentrations of the acid and the conjugate base should not differ by a factor of 10. Based on this information, derive pH range within which the buffer can work effectively. I know that I have to use the HH equation, but I ...

*April 16, 2013*

**chemistry**

To maintain the effectiveness of a buffer, relative concentrations of the acid and the conjugate base should not differ by a factor of 10. Based on this information, derive pH range within which the buffer can work effectively. I know that I have to use the HH equation, but I ...

*April 16, 2013*

**Chemistry**

Consider the following reaction that describes the solubility equilibria of solid Zn(OH)2 in aqueous solution (Ksp of Zn(OH)2 4.0x10^-17. Calculate molar solubility of Zn(OH)s in an acidic solution of pH5.0.

*April 16, 2013*

**Physics, diffraction, interference, help!**

3.Blue light (λ = 450 nm) shines on a diffraction grating that has 4000 lines/inch. A.Calculate the angle of the fourth-order image

*April 8, 2013*

**Physics, diffraction **

1. Yellow light of wavelength 580 nm shines on a diffraction grating with 4000 lines/cm. A.At what angles do the first-order and second-order maxima occur?

*April 8, 2013*

**physics**

Three different forces produce the same displacement: the vector Delta(r) starts at the left edge of your computer monitor and the tip points to the right edge of your monitor in a horizontal orientation. The first force has a magnitude of 10 N and it is pointing straight up, ...

*April 4, 2013*

**Math**

Yes IT IS!!100% correct good job!

*March 28, 2013*

**physics**

A 1.03 kg mass is attached to a spring of force constant 10.6 N/cm and placed on a frictionless surface. By how much will the spring stretch if the mass moves along a circular path of radius 0.525 m at a rate of 2.20 revolutions per second?

*March 18, 2013*

**physics**

You are in the lab with a 10 V battery. You have a 10 W light bulb and you want to put 1/2 A of current through the light bulb and 5 V across the light bulb. This will allow the light bulb to have a brightness proportional to 2.5 W. Assuming any resistors that you need, design...

*February 26, 2013*

**Calculus**

Never mind. I was able to figure it out.

*February 22, 2013*

**Calculus**

Find the derivative of f(x) = ln(13e^(5x) + 2)

*February 22, 2013*

**Physics**

A wire of cross-sectional area 5.00x10^-6 m^2 has a resistance of 1.75 ohm. what is the resistance of a wire of the same material and length as the first wire, but with a cross-sectional area of 8.75x10^-6 m^2? I really want to understand what to do here, so detailed steps ...

*February 12, 2013*

**Algebra**

A trapezoid when its height is h and the lengths of its bases are a and b. What is the area of a trapezoid when h = 6 meters, a = 5 meters, and b = 12 meters? Formula A = 1/2h(a+b) gives the area.

*February 12, 2013*

**School For Human Rights**

A student wants to prepare Halite. How much sodium can he use to completely react it with 30g of Chlorine gas?

*February 4, 2013*

**physics**

how much work (J) is done by friction when the mass is 150 kg and dragged for 10 m if the coefficient of sliding friction is .3?

*February 4, 2013*

**Algebra**

x-2y=.9 4x-3y=13.1 Solve using the substitution method.

*February 1, 2013*

** Algebra**

4x+y=42 6x-5y=50 Solve using the substitution method.

*February 1, 2013*

**math**

the product of three consecutive integers is 22 less than the cube of the middle integer. Find the integer.

*January 31, 2013*

**Geometry**

If you go to Eden a math tuition you will have the diagram for this question but if you do not there will be ... LET ME JUST GET TO THE QUESTION Question: what is the measure of MQ in the diagram shown?

*January 25, 2013*

**floral design**

One of your friends who works at a local public TV station knows that you wish to break into event-floral designing. She attended a party last week for which you had created an amazing set piece that surrounded a small dance floor. Impressed with your work, she asks you to ...

*January 24, 2013*

**Math**

Oh, never mind! 28 inches high /2 so you can find the area between ceiling and middle of painting.

*January 20, 2013*

**Math**

Oh, never mond! 28 inches high /2 so you can find the area between ceiling and middle of painting.

*January 20, 2013*

**Math**

Ughh....

*January 20, 2013*

**Math**

Hhow'd you get 14 inches though?

*January 20, 2013*

**Design **

What is the difference between the vegetative style and the landscape style of flower arranging? A. Vegetative arrangements group same-season flowers together, while landscape arrangements don't. B. The vegetative style features flowers as they're found in nature, ...

*January 16, 2013*

**Design **

Which design style encourages a complete manipulation of floral materials into unnatural geometric shapes and colors? A. Abstract B. New convention C. Ikebana D. New wave im thinking B

*January 16, 2013*

**Design **

What is the difference between layering and terracing? A. More depth can be achieved with layering than with terracing. B. In layering, the materials are more three-dimensional than in terracing. C. In layering, materials such as leaves can't be reversed to reveal ...

*January 16, 2013*

**Design **

_______ refers to the process of tying materials together to hold them in place in an arrangement. A. Binding B. Clustering C. Banding D. Grouping

*January 16, 2013*

**Physics**

A car traveling at 20 m/s accelerates at 7 m/s2 for 3 sec. How fast is it now traveling? Please help!

*January 15, 2013*

**Trigonometry**

In 2010, the population of a country was 70 million and growing at a rate of 1.9% per year. assuming the percentage growth rate remains constant express the population P, as a function of t, the number of years after 2010.

*January 15, 2013*

**Math**

The answer is... Wait, I think I just forgot. Ohh.... Never mind! The answer is: The test scores are 34,56,78,98. So the fourth test score is 98. Hope this helped

*January 4, 2013*

**Heat Capacity**

When a 3.25 g sample of solid sodium hydroxide was dissolved in a calorimeter in 100 g of water, the temperature rose from 23.9 C to 32.0 C. Calculate delta H (in kJ/mol) of for the solution process: NaOH (s) -> Na+(aq) + OH-(aq) Use a calorimeter heat capacity of Ccal = 15...

*December 18, 2012*

**Math**

-1/(x^3)-27 or -1=A(x^2+3x+9)+Bx+C(x-3) I'm trying to find the partial fraction decomposition. I think A=-1/21, but how do I find the right values to plug in for x to find B and C?

*December 17, 2012*

**Physics**

If you throw a ball straight upward at a speed of 24 m/s, how long will it take to reach zero speed? How long will it take to return to its starting point? How fast will it be going when it returns to its starting point?

*December 12, 2012*

**Math**

Just glancing at the problem makes me think 31.... idk

*December 5, 2012*

**English - writing**

Is this a run-on sentence? Though I do believe we need to be useful, honorable, and compassionate to live a successful life, I would argue that the purpose of life is to be happy, but only through the aforementioned requirements can we achieve happiness, and thus, we may “...

*November 28, 2012*

**Physics**

Suppose there is a small hole (radius=0.0203) at the base of a large tank. If the height of water in the tank is 15m (a) what is the speed of water escaping through the hole? (b) Calculate the amount of water (in cubic meters per second) escaping the tank.

*November 27, 2012*

**chemistry**

5.49atm

*November 26, 2012*

**math**

How would you condense a logarithm expression into a single quantity if the logs have different bases?

*November 20, 2012*

**algebra**

What is (-2)^2 (-3)^2

*November 19, 2012*

**Math**

Theater has 108 seats, which are arranged in rows. The number of seats in each row is 3 less than the number of rows. How many rows of seats are in the theater.

*November 14, 2012*

**algebra**

Y^2-y-6

*November 14, 2012*

**Business Calc **

Determine when, to the nearest year, $3,000 invested at 5% per year, compounded daily, will be worth $10,000.

*November 8, 2012*

**Math**

Suppose that ln2=r. Use properties of logarithms to write the logarithm in terms of r. ln32=__

*November 7, 2012*

**english**

1. What about Thoreau’s night in jail made him angry? (1 point) The fact that his stay in prison was too short to make a point. The interference with his protest. The uncomfortable accommodations. 2. Why do the playwrights refer to their protagonist as “The Now ...

*November 7, 2012*

**algebra**

7 nickels to 22 dimes

*November 4, 2012*

**health**

it should actuly have been c. I think your original answer was correct

*November 2, 2012*

**Math**

How do you simplify this? (x+3/x-6)-2/(x+3/x-6)+8

*October 29, 2012*

**math**

4((x/4)+5)-20 How do you solve this for x?

*October 29, 2012*

**English.**

2. worse than before he talked to virgil

*October 28, 2012*

**chemistry**

How many kilojoules of heat are released when 38.6g of CH4 reacts completely with O2 to form CH3OH at constant pressure?

*October 28, 2012*

**Health**

its d

*October 24, 2012*

**math**

(X`2-7x+10x`3+1) ÷(2X-1)

*October 24, 2012*

**College Physics**

two motorcycles of equal mass collide at a 90 deg. intersection. if the momentum of motorcycle A is 450 kg km/h west and the momentum of motorcycle B is 725 kg km/h south, what is the magnitude of the resulting momentum of the final mass?

*October 9, 2012*

**math**

The length of a rectangular area is 3 feet less than twice its width. The perimeter of the rectangle is 132 feet. Find the length and width of the rectangular area

*October 3, 2012*

**math**

Faye is making 13 bows to sell at the annual craft fair. She has 36 feet of ribbon to make her bows. If each bow requires 2 1/4 feet of ribbon will not be used

*September 27, 2012*