Monday

September 26, 2016
Total # Posts: 2,323

**chem**

Calculate the total pressure in the flask after all of the oxygen has been removed from the air in the flask. Assume that the temperature is 25¡ÆC, the initial barometric pressure is 760 torr and that air is 21% oxygen by volume.

*November 4, 2014*

**chemistry**

A chemist wants to make 5.50 L of a 0.300 M lithium phosphate solution. What mass of lithium phosphate must be used to make this solution?

*November 3, 2014*

**statistics**

Suppose that the amount of time it takes the IRS to refund to taxpayers is normally distributed with a mean of 12 weeks and a variance of 9. a. What percent of taxpayers should get a refund within 5 weeks? b. What percent of taxpayers will get their refund within 10-15 weeks? ...

*October 28, 2014*

**research methods grant writing**

The table labeled “Brooklyn Precinct Activity Measures” shows counts of different indicators from the June 1999 Compstat report. All data are totals for the period January 1, 1999, through June 20, 1999. Notice, in the key to this table, that some indicators are ...

*October 28, 2014*

**calculus**

A lamp post 3m high is 6m from a wall. A 2m man tall is walking directly from the post toward at 2.5m/s. How fast is his 1.5 from the wall

*October 20, 2014*

**mathematics**

what is algerdra

*October 17, 2014*

**chemistry**

a sample of freon-12 occupies 25.5 litters at 28 celsius find its volume at 15 degree celcius when the pressure is kept constant

*October 16, 2014*

**physics**

A water balloon is launched at a building 24m away with an initial velocity of 18 m/s at an angle of 50° above the horizontal. If the balloon misses or shoots over the building, how far will the balloon land from its launch location?

*October 13, 2014*

**physics**

A water balloon is launched at a building 24m away with an initial velocity of 18 m/s at an angle of 50° above the horizontal. At what height will the balloon strike the building?

*October 13, 2014*

**Cheeeem**

how to calculate the weight of solute req'd to prepare 1 liter of 1 normal of: a.) LiOH b.) phosphoric acid HELP.

*October 12, 2014*

**Physics**

A plane starts from rest at the end of a runway and requires 200.0 km/h for takeoff . If it takes 30.0 a to reach takeoff speed, what acceleration must the plane's engines provide to get off the runway ?

*October 7, 2014*

**CALCULOUS**

A bank account is growing by 4.3 % per year. Find the doubling time. Round your answer to the nearest integer. Can someone explain how to solve this step by step. I have been stuck on this for quite a while

*October 3, 2014*

**Pre Calc**

Use the Rule of 70 to estimate how long it takes a dollar-sign 7000 investment to double if it grows at the annual rate 7 %. Compare with the actual doubling times. Round your answers to three decimal places. I found the estimated doubling time using Rule of 70 to be 10. I am ...

*October 3, 2014*

**us history**

These committees act as study groups for the House and Senate. (1 point) select committees conference committees joint committees standing committees

*September 27, 2014*

**Math**

Using the following cash flows for projects A and B, use payback period, discounted payback period, NPV, IRR, and MIRR to see if these are good projects or not. > Project A: (283,000); 46,000; 89,000; 104,000; 123,000; 187,000; and 72,000 > Project B: (318,000); 72,000; ...

*September 27, 2014*

**Science URGENT**

A. 0.75 Hz

*September 26, 2014*

**Engineering Dynamics**

A ball is thrown so that the motion is defined by the equations x=5t and y=2+6t-4.9t^2, where x and y are expressed in meters and t is expressed in seconds. a) find velocity at t=1s, b) find the horizontal distance the ball travels before hitting the ground.

*September 25, 2014*

**physics**

An airport has runways only 196 m long. A small plane must reach a ground speed of 38 m/s before it can become airborne. What average acceleration must the plane’s engines provide if it is to take off safely from its airport? Answer in units of m/s 2

*September 23, 2014*

**physics**

a 700 newton man is able to climb up 4.5 meters on a 6 meters ladder before it slips. What must be the coefficient of friction be if the ladder is arranged so that it makes an angle 50 degrees with the ground? Assume the ladder to be uniform and weighing 450 newtons.

*September 23, 2014*

**math**

an object weighing 40 tons hits an object at 40 MPH what is the force of the impact?

*September 12, 2014*

**math**

If bacterium divides every 20 minutes. How many will there be in a day?

*September 10, 2014*

**Physics for Technology**

I have been out of school 27 years; no Algebra or Trigonometry training: only remedial math. This class is part of a Diploma program, no placement test required - I am out of my depth. I had a tutor for an hour last Tues., with another appt. this Tues. Yet, like I told my ...

*September 6, 2014*

**Chem**

Determine the number of protons and electrons in each of the following ions. Na+ Enter your answers numerically separated by a comma. Np, Ne =

*September 5, 2014*

**college algebra**

1. simplify x^2+x-6/x^2-4 divided by x+3/2x+4

*September 2, 2014*

**trigonometry**

Write the quadratic function whose zeros are: 1. 2+square root of 5, 2-square root of 5 2. 3+7i,3-7i 3. 5±i Please tell me how to get them. I have no clue on how to solve them.

*August 27, 2014*

**eng9**

The White House has been home to many animals as well as presidents. (1 point) common noun proper noun compound noun collective noun

*August 24, 2014*

**physics**

A ship at sea is due into a port 600 km due south in two days. However, a severe storm comes in and blows it 200 km due east from its original position. How far is the ship from its destination?

*August 24, 2014*

**College Algebra 1**

Using the factoring method, solve for the roots of quadratic equation 4x^2=16

*August 23, 2014*

**College Algebra 1**

Factor by using the difference of two square formula 1-25z^2

*August 23, 2014*

**static and dynamics**

A box is at rest on a 34incline. what is the force of friction parallel to the ramp if box has a mass of 50-kg

*August 20, 2014*

**probability**

A bag contains 8 red, 12 white and 4 blue marbles. If 2 marbles are selected in succession (without replacement), find the probability as a common fraction in simplest form that first is red and second is blue

*August 17, 2014*

**math**

Thanks. That helps.

*August 15, 2014*

**math**

When the perimeter of an equilateral triangle is doubled, the result is 24. The length of a side of the original triangle is A. 4 B. 6 C. 8 D. 12

*August 15, 2014*

**chemistry**

A 52.3 kg sample of ethanol is needed for a reaction. What volume in liters of ethanol should be used? The density of ethanol is 0.789 g/mL

*July 27, 2014*

**statistics**

According to the MIT Airline Data Project, American Airlines controlled 15.5% of the domestic market in 2010. A random sample of 125 domestic passengers that year was selected. Using the normal approximation to the binomial distribution, what is the probability that more than ...

*July 20, 2014*

**american government**

With unfunded mandates, the national government?

*June 29, 2014*

**american government**

Nullification would have had the effect of returning the nation to the Article of Confederation because?

*June 29, 2014*

**american government**

The federal system can be thought of as a marble cake because?

*June 29, 2014*

**Math **

What's 25 inch by 12 1/2

*June 27, 2014*

**Math**

Your program has a proposed RDT&E-funded project scheduled to start in January 2005 which is expected to take 16 months to complete. The project is expected to cost a total of $16 million (then-year dollars), with cost expected to be incurred at a rate of $1 million per month...

*June 24, 2014*

**Physics**

Determine the electric force of a -8.0uc charge would experience when placed 14cm to the left of a 5.0uc charge. got 18N, but I'm not sure if I add the negative to the answer

*June 18, 2014*

**Math **

Write the quadratic function in standard form (if necessary) and sketch its graph. Identify the vertex. f(x)=x^2+3x+1/4

*June 17, 2014*

**Engineering science**

a 50kg mass is suspended from a spring, causing it to extend by 30mm. calceolate the spring stiffness? The mass is then pulled down a distance of 90mm and released. calculate the frequency of the resulting motion, assuming that this is simple harmonic, calculate the velocity ...

*June 9, 2014*

**Finance**

Pretty Lady Cosmetic Products has an average production process time of 40 days. Finished foods are kept on hand for an average of 15 days before they are sold. Accounts receivable are outstanding an average of 35 days, and the firm receives 40 days of credit on its purchases ...

*June 7, 2014*

**Physics**

Why is 5*10^3 multiplied by a electron charge?

*June 4, 2014*

**correction**

15m/s^2

*June 4, 2014*

**Physics**

A small charge that has lost 5.0 X 10^3 electrons and has a mass of 2.0 x 10^-6 kg experiences an acceleration of 15ms^2 when placed at a point P in space. Determine the magnitude and direction of the electric field at P

*June 4, 2014*

**math**

sqrt(350^2+400^2)=531.5ft 350+400= 750ft 750-531.5= 218.5ft The trip is 218.5ft shorter if you walk diagonally.

*June 3, 2014*

**physics**

sqrt(10^2+10^2)= 14.14m The total displacement is 14m North East

*June 3, 2014*

**algebra**

B does not equal the others .04*3000=120 .4*30=12 .4*300=120 .3*400=120

*June 3, 2014*

**Physics**

I don't think so, we just started on parallel plates in school and he assigned this question for homework and i have no clue how I would get the final velocity from what was given.

*June 3, 2014*

**Physics**

It does not say in the question

*June 3, 2014*

**Physics**

Determine the final velocity of an alpha particle (3.2x10^-19) if it is placed in a 7.2x10^6 n/c uniform field. The mass of the alpha particle is 6.64x10^-27

*June 3, 2014*

**MGT**

What is a project stakeholder? What are some examples of project stakeholders?

*June 3, 2014*

**Science Please Help Me**

R THESE THE RIGHT ANSWERS ?

*June 3, 2014*

**Scientific Method**

primitive

*May 25, 2014*

**chemistry**

Use the systematic treatment of equilibrium to determine the pH and concentrations of species in 1.00 L of solution containing 0.065 mol citric acid (H3A), 0.025 mol 8-hydroxyquinoline (HB), and 0.040 mol KOH. Consider just acid-base chemistry. Ignore ion pairing and activity ...

*May 23, 2014*

**Physics**

2.2

*May 16, 2014*

**Finance**

The Fridge-Air Company's preferred stock pays a dividend of $4.50 per share annually. If the required rate of return on comparable quality preferred stocks is 14 percent, calculate the value of Fridge-Air's preferred stock. What fomula to use?

*May 15, 2014*

**Math - Algebra**

Ti'a rectangular gaden has perimeter of 20 meters. She wants its area to be at least 24 square metesr. Find the interval for the possible length of Tia's garden.

*May 8, 2014*

**Math**

A glass held 2/5 cup of water, Carlo poured out 3/8 cup, how much is left?

*May 7, 2014*

**Chemistry**

Did I ionize Mn2(CO3)3 correctly? Mn2(CO3)3 --> 2Mn^(3+) + 3CO3^(2-)

*April 29, 2014*

**Math**

At which points do the lines intersect 2x+y=8 y=-3(x-3) A. 0,8 B. 3,-2 C. 2,4 D. 1,6

*April 28, 2014*

**Psycholohy**

One way to measure the validity of a test would be to: you were testing for:

*April 27, 2014*

**chemistry**

What volume of ethanol must be diluted with water to prepare 315 mL of 0.620 M solution? The density of ethanol is given as 0.789 g/mL. Answer in units of mL

*April 25, 2014*

**math 8th**

Find the circumference of the given circle. Round to the nearest tenth. circle (1 point) 22.0 cm 38.5 cm 11.0 cm 42.8 cm

*April 18, 2014*

**math**

If Ѳ is in Quadrant II, and cos Ѳ=-3/4 , find an exact value for sin 2Ѳ.

*April 18, 2014*

**algebra**

write in expanded logarithmic form: ln (x y^3 z^7)

*April 11, 2014*

**algebra**

Solve: log x + log(x+15)=2

*April 11, 2014*

**algebra**

Solve: 7 ^(x+3) =519

*April 11, 2014*

**math**

Solve 40e^(0.6x) - 3=237

*April 11, 2014*

**Espanol **

Can I get some corrections? 1. ¿Qué estás haciendo? A. Estás sirviendo la cena. B. Estáis leyendo el texto. C. Me estoy levantando. D. No estás haciendo nada. C 2. ¿Entonces estás descansando? A. Sí, estás ...

*April 2, 2014*

**math**

the answer is 40ft

*April 2, 2014*

**math 8th**

Find the measure of ∠s. angle s (1 point) 63° 153° 68° 148°

*March 31, 2014*

**Chemistry**

In the spectrum of a specific element, there is a line with a wavelength of 656 nm. Use the Rydberg equation to calculate the value of n for the higher energy Bohr orbit involved in the emission of this light. Assume the value for the lower energy orbit equals 2.

*March 31, 2014*

**algebra**

Which box-and-whisker plot shows the scores of ten students on a mathematics exam? 92, 76, 83, 97, 74, 81, 92, 91, 96, 87 (1 point) box and whisker plot box and whisker plot box and whisker plot box and whisker plot

*March 31, 2014*

**Algebra**

Rewrite the equation in Ax+By=C form. Use integers for A, B, and C. y-5=-5(x-2)

*March 30, 2014*

**english**

Think about the figurative language in this stanza. What is the speaker saying? (1 point) It is hard to find your way at night because it is dark. It is the middle of the night and she is hungry. People find life in being with others. People have to help each other with ...

*March 29, 2014*

**algebra**

Solve the following rational inequality. Write the solution in interval notation. Show the number line and breaking points or graph of the polynomial with the part of the graph that is the solution (x-4)(x+2)/(x-3)(x+5) ¡Ü 0

*March 29, 2014*

**algebra**

less than or equal to

*March 28, 2014*

**algebra**

Solve the following rational inequality. Write the solution in interval notation. Show the number line and breaking points or graph of the polynomial with the part of the graph that is the solution (x-4)(x+2)/(x-3)(x+5) ¡Ü0

*March 28, 2014*

**algebra**

write a fourth degree polynomial function with real coefficients that has -3,1/5, and 4+i as zeros and the y intercept of (0,5)

*March 28, 2014*

**Algebra word problem**

thanks Steve if I was to figure avg cost 3.6-7.2+4.493=.893 times 100 for a total of $89.30 per bike??

*March 28, 2014*

**Algebra word problem**

J's bike has determined that when x hundred bikes are built, the average cost per bike is given by C(x)= 0.1x^2-1.2x+4.993, where C(x) is in hundreds of dollars. how many bikes should the shop build to minimize the average cost per bike?

*March 28, 2014*

**math**

J's bike has determined that when x hundred bikes are built, the average cost per bike is given by C(x)= 0.1x^2-1.2x+4.993, where C(x) is in hundreds of dollars. how many bikes should the shop build to minimize the average cost per bike?

*March 28, 2014*

**georgia history**

hich of the following was a cause of the Great Depression? (Choose all that apply.) (3 points) the Stock Market Crash of 1929 Prohibition Failed crops and drought A lack of demand for goods

*March 28, 2014*

**Algebra**

Keiko is a software saleswoman. Let represent her total pay (in dollars). Let represent the number of copies of History is Fun she sells. Suppose that and are related by the equation . Answer the questions below. Note that a change can be an increase or a decrease. For an ...

*March 27, 2014*

**Physics.**

A dike in Holland springs a leak through a hole of area 0.60cm2 at a depth of 1.4m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak? Express your answer to two significant figures and include the appropriate units.

*March 27, 2014*

**Physics**

Calculate the average force per nail when Sarah (following figure), who weighs 130 pounds, lies on a bed of nails and is supported by 600 nails. Express your answer using two significant figures.

*March 27, 2014*

**Physics.**

The top floor of a building is 40m above the basement. Calculate how much greater the water pressure is in the basement than on the top floor. Express your answer to two significant figures and include the appropriate units.

*March 27, 2014*

**Physics.**

Calculate the water pressure at the base of the Hoover Dam. The depth of water behind the dam is 220m . Express your answer to two significant figures and include the appropriate units.

*March 27, 2014*

**Physics**

Pressure = weight density × depth Calculate the water pressure at the bottom of the 50-m-high water tower shown in the photo. Express your answer to two significant figures and include the appropriate units

*March 27, 2014*

**American History**

B

*March 26, 2014*

**math**

if one rhombus measures 62 what are the remaining angle

*March 25, 2014*

**science**

an object being pulled to earth by gravity will have the force of air pushing back opposite directions

*March 22, 2014*

**language arts**

rewrite each sentence, adding commas where needed. which i was researching skateboards i found an interesting old newspaper story?

*March 22, 2014*

**language arts**

Resilient people usually a. complain when they have bad luck b. bring good luck to others c. are able to deal with setback

*March 20, 2014*

**math 8th**

1. The following circle graph was published in the Cane County annual report. If there are 1,000 registered voters in Cane County, how many are 35–45 years old? circle graph (1 point) 150 voters

*March 20, 2014*