Monday

September 26, 2016
Total # Posts: 1,080

**chemistry**

the reaction of 7.10g carbon with excess O2 yields 12.25g of CO2. what is the percent yield of this reaction? I have tried everything and looked through all of my notes and nothing is working for stiochiometry

*October 6, 2014*

**Physics**

A glider of length 10.1 cm moves on an air track with constant acceleration. A time interval of 0.732 s elapses between the moment when its front end passes a fixed point circled A along the track and the moment when its back end passes this point. Next, a time interval of 1....

*September 16, 2014*

**algebra**

Find the standard form for the equation of a circle (x−h)^2+(y−k)^2=r^2 with a diameter that has endpoints (−8,−10) and (5,−4). Find the h= -1.5 k= -7 r=? I do not understand how to find the radius.

*September 14, 2014*

**Quantitative Reasoning (math)**

Your weight on the moon is relative to your weight on Earth. Neil Armstrong weighed 360 lbs. in his moon gear while on Earth, but on the moon he only weighed 60 lbs. What is the ratio of the Earth weight to the moon weight? How much would you weigh (approximately) on the moon?

*September 11, 2014*

**Quantitative Reasoning (math)**

One out of every five people who buys ice cream buy vanilla ice cream. If a store sells 125 ice cream cones in one day, about how many will be vanilla? I know how to solve the proportion once I set it up, but I cant figure out how to set it up

*September 10, 2014*

**Algebra**

The length of a rectangle is 1 foot less than twice the width, and the area of the rectangle is 21 ft.². Find the dimensions of the rectangle

*September 7, 2014*

**Precalculus/Trig**

I can't seem to prove these trig identities and would really appreciate help: 1. cosx + 1/sin^3x = cscx/1 - cosx I changed the 1: cosx/sin^3x + sin^3x/sin^3x = cscx/1-cosx Simplified: cosx + sin^3x/sin^3x = cscx/1-cosx I don't know where to go from there. 2. (sinx + ...

*August 15, 2014*

**Precalculus/Trig**

Prove the following identity: 1/tanx + tanx = 1/sinxcosx I can't seem to prove it. This is my work, I must've made a mistake somewhere: Converted 1/tanx: 1/sinx/cosx + sinx/cosx = 1/sinxcosx Simplified 1/sinx/cosx: cosx/sinx + sinx/cosx = 1/sinxcosx Found common ...

*August 14, 2014*

**Math**

Sorry- it was 1/3c = 6b^2 + 2. I can see your way of substituting, though!

*August 4, 2014*

**Math**

Actually, just did it again and got (D). However, it's an SAT question and I need the fastest way to solve it... what I did was plug in values for a and b (3 and 2, respectively) then find c (78) and plug a (3) back into each of the choices to see if c (78) and the answer ...

*August 4, 2014*

**Math**

If 2a = 3b, 1/3c = 6b^2, and b > 0, what is c in terms of a? The answer choices are: (A) 8a^2 + 6 (B) 8a^2 + 12 (C) 12a^2 + 6 (D) 18a^2 + 6 (E) 18a^2 + 12 Thank you!

*August 4, 2014*

** SP180.1.2 Principles of Public Speaking**

i need help with my outline. not sure where to go. i am at a complete loss i know i want my topic to be Why banning the use of cell phones while driving should be mandatory nationwide I. TITLE: Why banning the use of cell phones while driving should be mandatory nationwide A. ...

*June 12, 2014*

**personal finance**

If Bridgette marrow is a sophomore at state college ad is running out of money. wanting to continue her education, Bridget is considering a student loan. Explain her options. How can she best minimize her borrowing costs and maximize her flexibility?

*June 8, 2014*

**algebra 2 and Trigeonomerty**

a bag contains 12blue, 10 green and 6 red and 2 white marbles. a) If you draw 3 marbles without putting them back, what is the probability that all 3 are blue? 12/30 * 9/27 =0.133? b) If you draw 2 marbles without putting them back, what is the probability that neither is blue...

*May 27, 2014*

**Economics help please!!!**

In a specific industry, two dominant firms work together to set prices. We call this A. competition. B. collusion. C. market dominance. D. market influence. Answer this Question

*May 22, 2014*

**Economics**

Im thinking A. Am i correct?

*May 22, 2014*

**Economics **

Unemployment is on the rise though inflation is quite low. Gross Domestic Product is rising but more slowly than the goal rate. The Federal Reserve may buy government securities in open market operations in order to A. increase the money supply and encourage economic growth. B...

*May 22, 2014*

**math**

The test scores for a math class are shown below 83,85,82,93,83,84,95,87,86,94 what is the standard deviation of the data set?

*May 19, 2014*

**math**

there are 4 blue tile,s 3 yellow tiles, 5 red tiles, and 2 green tiles. he draws a tile replaces it, and draws another tile. what is the probability he will draw a blue tile on both

*May 19, 2014*

**math**

In triangle PQR, m<P=53 degrees, PQ=7.4, and PR=9.6. What is m<R to the nearest degree

*May 19, 2014*

**Math Question**

Find an equation that models a hyperbolic lens with a=16 inches and foci that are 40 inches apart. Assume that the center of the hyperbola is the origin and the transverse axis is vertical

*May 19, 2014*

**Algebra help please!**

Suppose you are researching the eating habits of people your age. What sampling method could you use to find the percent of students in your grade who eat five servings of fruit and vegetables each day? What is an example of a survey question that does not have bias?

*April 14, 2014*

**math**

Find the scale factor troy will to build his pool. The width is 625cm. The olympic pool is 50m long and 25m wide. Then find the length using the scale factor of troy pool

*April 13, 2014*

**Chemistry**

The final answer I got was NO + 3Cu^2+ + 4OH^- --> NO3- + 3Cu^+ + 2H2O Which was right. Thank you very much for your help.:)

*April 9, 2014*

**Chemistry**

So would this be right then NO + 2H2O + 3Cu^2+ + OH^- ---> 3Cu^+ + NO3^- + 4H^+ +OH^-

*April 9, 2014*

**Chemistry**

For a particular redox reaction NO is oxidized to NO3^- and Cu^2+ is reduced to Cu^+ . Complete and balance the equation for this reaction in basic solution. We are given this as a guide to start NO + Cu^2+ --> NO3^- + Cu^+ I started with: Cu^2+ + 2e- --> Cu No + 2H2O...

*April 9, 2014*

**Geometry**

#19. Given a regular octagon, find the measures of the angles formed by (a) two consecutive radii and (b) a radius and a side of the polygon.

*April 8, 2014*

**Geometry**

#7. Find the area of a polygon with the vertices of (-4,5), (-1,5), (4,-3), and (-4,-3).

*April 7, 2014*

**physics**

I have no idea that's why I came to this website

*April 3, 2014*

**Geometry**

The glide reflection Ry--x degree T <4,1> maps the P to (4,3). Find the coordinates of P. Please help I'm really confused.

*March 31, 2014*

**Geometry**

Thank you Steve.

*March 27, 2014*

**Geometry**

Given the lengths of the sides of a triangle, identify the triangle as acute, right, or obtuse. 37,12,34 5,12,13 20,21,28

*March 27, 2014*

**algebra**

y/4=15/20 how do I solve the proportion? please explain it to me. I have several to do

*March 20, 2014*

**ratio**

given the proportion a/b=5/19, what ratio completes the equivalent proportion a/5= / ? a. a/19 b. b/19 c. 5/19 d. 19/b

*March 19, 2014*

**chemistry**

If a tank contains 55.2 g of butane, what volume, in liters, of oxygen is needed to burn all the butane at 0.850 atm and 25 degrees Celsius? Need to show work too.

*March 19, 2014*

**Chemistry**

1.695*10^-7

*March 18, 2014*

**Earth science**

The greenhouse effect is a result of A. consumption of fruits and vegetables that produce a biofuel. B. absorption and radiation of energy in the hydrosphere. C. absorption and radiation of energy in the atmosphere. D. consumption and radiation of energy in the atmosphere. D?

*March 13, 2014*

**Earth science**

1. Which of the following is not a natural cause of climatic change? A. Earth's tilt B. Solar activity C. Human activity D. Volcanic activity I think it is C

*March 13, 2014*

**Algebra - Functions**

Aaron is a salesman that earns a base salary of $1,200.00 per month and a commission of 5% on the amount of sales he makes. One month Aaron received a paycheck for $1,811.00. Find the amount of his sales for the month.

*March 12, 2014*

**math**

in the rhombus angle 1=140. what are angle 2 and angle 3? a. angle 2=140, angle 3=20 b. angle 2=40, angle 3=70 c. angle 2=40, angle 3=20 d. angle 2=140, angle 3=70

*March 10, 2014*

**social studies**

The Louisiana economy as were the economies of several other states was based on plantation slavery and there were no more slaves to raise cotton and other crops such as sugar cane. The people of Louisiana lost all of their money during the war so capital was also scarce. And ...

*March 9, 2014*

**Math**

What is an equation in slope-intercept form for y(-4,-2) and x (5,1)?

*March 9, 2014*

**Math**

Is the line through points P(3,-5) and Q(1,4) parallel to the line through points R(-1,1) and S(3-3)? Explain please.

*March 9, 2014*

**chemistry**

What mass of bromine gas will form from the complete reaction of 150 g potassium bromide and 120 g of chlorine

*March 8, 2014*

**Math**

Use roster notation to create and write two proper subsets of your original set. 3. Do the following and write your answers in roster notation. •Find the union of the sets. •Find the intersection of the sets. •Find the complement of each of the sets.

*February 28, 2014*

**physics**

Milk with a mass of 0.021 kg and a tempera- ture of 13C is added to 0.12 kg of coffee at 94C. What is the final temperature? Assume the specific heat capacities of the two liquids are the same as water, and disregard any energy transfer to the liquids’ ...

*February 11, 2014*

**Math**

Steve can run 3.5 miles in 30 minutes. If Steve increases his rate by 1/2 mile per hour, how far will he run in 2 hours?

*January 27, 2014*

**American National Gov.**

The American bureaucracy conjures up the following images except cumbersome “red tape.” civil servants who are inefficient, unresponsive, and unhelpful. officials who have amassed power and who act against the rights of citizens. a system that can act quickly in a ...

*January 26, 2014*

**American History**

I also choose B

*January 26, 2014*

**American National Gov.**

I'm sorry I didn't know how this board worked so I am going back and giving the best answers I can

*January 26, 2014*

**American National Gov.**

I think it's D but not 100% sure

*January 26, 2014*

**American National Gov.**

For Max Weber, the bureaucracy was the highest form of rationality because bureaucrats would become cogs in the wheel. it was impersonal. it was personal. it was ordered by impartial rules or laws

*January 26, 2014*

**American National Government**

Thanks I went back to my text the answer is A

*January 26, 2014*

**American National Government**

I believe the answer is A

*January 26, 2014*

**American National Government**

Theodore Lowi suggested the remedy for cumbersome bureaucracy was returning to juridical democracy. delegating even more authority. reducing the size of government. throwing money at the problem.

*January 26, 2014*

**American National Government**

The 2000 presidential election is an example of where it is possible to win the popular vote but not have a majority vote in the Electoral College. become President by losing both the Iowa Caucus and the New Hampshire Primary. become President without having a recount of ...

*January 26, 2014*

**American National Government**

I just read the definitations for these and I think A is the answer plaes let me know if it makes sense

*January 26, 2014*

**American National Government**

The tendency of Congress to defer to the President in foreign policy has at times led to an American dictatorship. a plebiscitary presidency. an imperial presidency. active-positive presidents

*January 26, 2014*

**EMT basic**

You and your partner are returning a patient from the Emergency Department to the local nursing home in an ambulance. Your partner is attending to the patient and you are driving. You put the radio on your favorite music station and crack the windows to let the crisp winter ...

*January 18, 2014*

**Algebra 2 help.**

For the function f(x)=(3-4x)^2, find f^-1. Determine whether f^1 is a function.

*January 14, 2014*

**Stuck on this Algebra 2 question!**

what is the solution of the system of equations? 2x+2y+3z=-6 3x+5y+4z=3 2x+3y+4z=-10

*January 11, 2014*

**Anyone want to help me?**

Solve the equation or formula for the indicated variable. s=6r^5t for t

*January 10, 2014*

**help!!!!**

Combine like terms. What is a simpler form of the expression. -3(-y-2)+5y

*January 10, 2014*

**Finance**

Now that you have a full time job you are ready to start investing for retirement. Your corporation will match 50 cents of each dollar that you put in your 401K account up to the first $7,000. You have altogether $15,000 that you can afford to save this year. How should you ...

*December 19, 2013*

**Politics**

which of the following is part of an issue network addressing education policy? A. And education reporter for ny times B.a lobbyist for the American Federation of Teachers C. The white house cheif od ataff D. The gov of cali The superintendent of the Chicago citu schoold

*December 15, 2013*

**math**

6-mile perimeter. The length is 4 times the width.what is the length width

*December 11, 2013*

**volcanoes**

what supplies do you need to make a volcanoes lava if you were to make a volcano. What would be the best thing to use to make a volcano?

*December 9, 2013*

**Science help,please...**

I am just kidding. What grade stuff is this?

*December 9, 2013*

**Science help,please...**

What grade are you in and are you cheating?

*December 9, 2013*

**Chemistry**

Sodium vapor lamps are often used in residential street lighting. They give off yellow light with a frequency of about 5.91 × 1014 Hz. What is this wavelength in nm?

*November 20, 2013*

**chemistry**

Thank you

*November 20, 2013*

**chemistry**

Potassium metal, K, is more reactive than sodium, Na. Calcium, Ca, is less reactive than sodium. The comparative reactivity of these metals is K > Na > Ca. Explain the reactivity differences of K, Na and Ca based on their atomic structure.

*November 20, 2013*

**chemistry**

First off, how do you eve find out if it would be colored or colorless? Will aqueous solutions of the following salts be colored or colorless? Explain. a. Titanium (II) chloride b. Beryllium chloride c. Tin (II) nitrate d. Iron (III) nitrate

*November 20, 2013*

**Chemistry**

The most chemically reactive metal elements are the alkali metals. They react spontaneously with water or other substances in the atmosphere and must be stored under oil. a. What type of reactions will these metals undergo? b. Explain why these metals are so reactive in the ...

*November 19, 2013*

**chemistry**

The letters CHEMISTRY were spray painted in blue paint on the snow. After a while the sun comes out and the snow under the blue paint melts while the snow around the letters do not. Why did the snow under (rather than around) the blue paint melt?

*November 19, 2013*

**Math**

a parking lot can allocate 3 compact car spaces for every 2 spaces for full sized cars. if part of the lot has space for 40 full sized cars, how many compact cars could it hold if the parking lines were redrawn?

*November 13, 2013*

**Math**

Find the missing sides of the similar triangles ABC and DEF. AC=2 AB=5 CB=? DF=4 FE=8 DE=?

*November 13, 2013*

**Math**

Explain why the lengths of the corresponding sides of rectangles ABCD and EFGH vary proportionally. I cant post the picture of the triangles but the length of the first triangle DA=44 and the width AB=88. The second triangles length HE=35 and width EF=70

*November 13, 2013*

**Math**

Solve the proportion: 2/3 = 8/x-1

*November 13, 2013*

**Math**

Solve the proportion: x/20 = 5/8

*November 13, 2013*

**chemistry**

given 10.8 grams of substance y,if the substance absorbs 231 kilojoules of energy and the specfic heat of substance is 6.55 J/g*0C what is the heat change

*November 7, 2013*

**math**

the total capacity of 1 carton is the same as the total capacity of 2 identical cups. If 1.8 liters of water are needed to fill up 3 identical cups and 2 identical cartons, what is the capacity of a cup? express your answer correct to 2 decimal places

*October 17, 2013*

**Physics**

A person pushes on a 56-kg refrigerator with a horizontal force of -251 N; the minus sign indicates that the force points in the −x direction. The coefficient of static friction is 0.7. (a) If the refrigerator does not move, what are the magnitude and direction of the ...

*October 2, 2013*

**Physics 2**

A 3.0-g string, 0.14 m long, is under tension. The string produces a 200-Hz tone when it vibrates in the third harmonic. The speed of sound in air is 344 m/s. Find the tension in the string.

*September 29, 2013*

**math**

Lisa runs 6 miles in 55 minutes, at the same rate, how many miles would she have ran in 44 minutes?

*September 16, 2013*

**Physics**

Suppose that the gravitational acceleration on a certain planet is only 3.1 m/s2. A space explorer standing on this planet throws a ball straight upward with an initial velocity of 35 m/s a) What is the velocity of the ball 4 seconds after it is thrown? m/s (b) How much time ...

*September 7, 2013*

**child day care**

first founded as a parent cooperative, is/are one of the best examples of successful early childhood school-family partnership.

*August 22, 2013*

**world history**

identify and describe two ways in which American federalism has changed since the ratification of the constitution

*August 7, 2013*

**Math**

-7(2a2-4) Multiply

*August 4, 2013*

**MATH**

but when h is 0 t=0....

*July 19, 2013*

**MATH**

Given that logbase2 a+logbase2 b=3 , calculate all the possible integer values of a if b is also an integer value. Explain your reasoning.

*July 15, 2013*

**MATH**

Given that x=logbase3 5 and y=logbase3 2 , rewrite logbase3 60 in terms of x and y.

*July 15, 2013*

**algebra**

change pints to gallons. 1 1/2 pints = 3/16 gallon 3/16 x _____ = ____ create proportion. 6^3 24^3 6^3 * x = 24^3 * 3/16 216 * x = 13824 * 3/16 simplify 216 * x = 2592 divide both sides by 216 x = 12 gallons

*June 17, 2013*

**Physics**

A car is stopped at a traffic light. When the light turns green, the driver accelerates so that the car is going 10 m/s after 5s. What is the car’s average acceleration?

*June 3, 2013*

**Aviation**

Does the engine of a Cessna 162 have an alternate air source? How many fuel pumps does the Cessna 162 have? Your help is very much appreciated!

*May 31, 2013*

**ashford university**

Use two commas around “extra information” in a sentence to show that it is not important to the meaning of that sentence if taken out. For example: “The hardware store down the street, which had been paved recently, is open until midnight five days a week.”

*May 17, 2013*

**HCS/212**

7. Have you personally or professionally noticed any changes in the way health care information or services are researched or accessed? Explain your response. 8. Are you finding that there is an increase or a decrease in options for finding or researching information about ...

*April 28, 2013*

**algebra**

Complete the following word problems. 14.It takes 9 hours for Isabella to rake leaves by herself,but her brother Matthew can work three times as fast.If they work together, how long will it take them to rake leaves? Rate Time Work Done Isabella Matthew

*April 24, 2013*

**Chemistry**

What are the healthcare applications of biochemical, pharmaceutical and diagnostic chemical reactions?

*April 18, 2013*