Monday

March 2, 2015

March 2, 2015

Total # Posts: 469

**Chemistry **

For the reaction 4FeCl2(aq) + 3O2(g) → 2Fe2O3(s) + 4Cl2(g), what volume of a 0.650 M solution of FeCl2 is required to react completely with 8.58 × 1021 molecules of O2?
*February 23, 2015*

**math**

There is a slide in the park that is 18 feet long. The ladder to the top of the slide is 7.5 feet long. If the ladder and the slide are perpendicular, what is d, the distance from the top of the slide to the ground? If necessary, round to the nearest tenth
*February 19, 2015*

**math**

Lucy has 40 bean plants,32 tomato plants,and16 peppers plants.She wants to put the plants in rows with only one type of plant in each row.All rows will have the same number of plants.How many plants can Lucyput in each row
*February 3, 2015*

**trig**

an observer at A looks due north and sees a meteor with an angle of elevation of 70 degrees. At the same instant, another observer 30 miles east of A seed the same meteor and approximates its position as N 50 degrees W but fails to note its angle of elevation. Find the height ...
*January 11, 2015*

**maths**

40-5+70-6=?
*January 6, 2015*

**History**

This is the paragraph you need to compare and contrast to today. I needed help on it so I was wondering if anyone could give me a couple of ideas... Like list a 1 or 2 comparisons or contractions and I will figure it out to make it into a paragraph form and also write extra on...
*January 1, 2015*

**History**

After you have read the following, write a short essay comparing and contrasting life in the Middle Ages to today. Is there anything that was better about life then? The next time you are washing your hands and complain because the water temperature isn't just how you like...
*January 1, 2015*

**economics**

Small Scale Industry (i) These industries employ less number of persons and capital. (ii) Most of the work is done by manpower, small machines and tools. (iii) Raw materials used are less and the production is consequently less. (iv) They are scattered in rural and urban areas...
*December 31, 2014*

**Algebra**

Sorry the choices were: 1. 280 years 2. 0.28 years 3. 28 years 4. 2.8 years
*December 31, 2014*

**Algebra**

You deposit $3,000 in a savings account that earns 6% simple interest. How long will it be before you have a total of $3,500?
*December 31, 2014*

**Math help, Please**

An inverted conical tank (with vertex down) is 14 feet across the top and 24 feet deep. If water is flowing in at a rate of 12 ft3/min, find the rate of change of the depth of the water when the water is 10 feet deep.
*December 29, 2014*

**Calculus **

Determine the equation of the normal line y=x^2+5 at the point (2, 9) I got y= 4x+1
*December 21, 2014*

**Math HELP!- Got it! But need Help on Definition of Relative maxima**

So I put the derivative of 15x^4-75x^2+60 into wolfram-alpha and it got four critial points on the graph, but they're all equally leveled...so does mean there is no relative maxima or that there are four of them?
*December 15, 2014*

**Math HELP!**

Consider the function y = 3x5 – 25x3 + 60x + 1. Use the first or second derivative test to test the critical points. How many relative maxima did you find? 0 1 2 <--- 3 4
*December 15, 2014*

**physics **

Ben uses a parachute, to fall to the ground at a safe, steady speed. Discuss the energy transfers, which allow ben and his parachute, to drop at a steady speed.
*November 30, 2014*

**math**

what is 245+6,0000435= thanks for help and thank u i need to pass my 3rd grade test thanks
*November 20, 2014*

**Math**

marie is the scuba diving. she jumps from a rock 3 m and reaches a depth of 7m. it is the distance from the dive?
*November 20, 2014*

**Pls check if I got it correct**

Which of these situations can you represent with the inequality X < and = 49? 1. You must be no more than 49 inches tall to go on this ride. 2. A loaf of bread must be baked for at least 49 minutes. 3. You have no more than 49 minutes left on a parking meter. 4. The bill at...
*November 18, 2014*

**Need help to check my answer, please!**

Please check my answer, please! Thank you :)
*November 18, 2014*

**Math**

Which of these situations can you represent with the inequality X < and = 49? 1. You must be no more than 49 inches tall to go on this ride. 2. A loaf of bread must be baked for at least 49 minutes. 3. You have no more than 49 minutes left on a parking meter. 4. The bill at...
*November 18, 2014*

**AP Chem**

Suppose I take a 1.0 L saturated, room temp solution of lead(2)bromide and dissolve 1.3g of potassium bromide in the solution. Will lead(2) bromide precipitate out? If yes how much( in grams)? If no, why not? I found the ksp for PbBr2 at room temp, and used it to find the ...
*November 11, 2014*

**Calculus (math)**

A boat leaves a dock at 2:00 P.M. and travels due south at a speed of 15 km/h. Another boat has been heading due east at 20 km/h and reaches the same dock at 3:00 P.M. How many minutes past 2:00 P.M. were the boats closest together?
*November 8, 2014*

**Math**

A jet flies at an altitude of 52,800 feet. What is the height of the jet in miles? I need help with this problem please
*November 5, 2014*

**Algebra 2**

Mrs. Burnett throws a ball innthe air with an initial velocity of 96 feet per second. The function f(t) = 96t - 16t^^2 represents the path of the ball. How high will the ball go? How long will it take the ball to reach the ground?
*October 29, 2014*

**chemistry**

A flask that can withstand an internal pressure of 2511 torr, but no more, is filled with a gas at 21.0°C and 758 torr and heated. At what temperature will it burst? i used P1/x=P2/T2 and got 69.6 degrees Celsius. what is wrong
*October 20, 2014*

**chemistry**

H2(g) + Cl2(g) HCl(g) Consider the unbalanced equation above. 3.95 L of H2 and 1.00 L of Cl2 are reacted under the same conditions of temperature and pressure. (a) How many liters of HCl will be produced? (b) How many liters of reactant are in excess? i found part a to be 2.00...
*October 20, 2014*

**math**

Please help!
*October 16, 2014*

**math**

A woman owns stock in two companies, company A and company B. She owns 79 shares of stock in company A. Each share of stock in company A is worth $12. Each share of stock in company B is worth $19. Write three equations to represent the total number of shares of stock the ...
*October 16, 2014*

**Math**

This would equal 2 1/2 or 2.50
*October 16, 2014*

**Maths**

Thank you very much!!! then how to do this qn? y is directly proportional to the square root of x.If y is quadrupled,find the percentage change in x.
*October 16, 2014*

**Maths**

If it takes 6 men 4h to dig a hole 6m deep,how long will it take 10 men to dig a hole 5m deep?
*October 16, 2014*

**Math**

A basketball team won 70% of the 30 games they played. How many games did they win?
*October 15, 2014*

**Help**

I recently completed this same exam.The answers to all questions were clearly explained in the given text. I should turn you in for cheating. You should be ashamed.
*October 11, 2014*

**Biochemistry**

Which solutions, animal or plant, were more suitable to resisting pH change? Why do you think this is the case? Explain.
*October 8, 2014*

**Biochemistry**

Which solutions, animal or plant, were more suitable to resisting pH change? Why do you think this is the case? Explain.
*October 8, 2014*

**Biochemistry**

All biological enzymes function best at particular pH values. In the normal human stomach, the pH of 2.0-3.0 provides the environment required for the proper functioning of the digestive enzymes found there. 1. How would adding a basic medicine effect the pH of the stomach? 2....
*October 8, 2014*

**Biochemistry**

You are told that the solutions in two beakers are both 0.02 M solutions of acids "A" is weak acid and acid "B" is a strong acid. Which of the two acids would have the lower pH, acid "A" or acid "B"? Explain your answer.
*October 8, 2014*

**Pre-Calc/Trig...**

Its a transformation because the slope is the same, the y-intercept is just shifted up 7 instead of being at zero. Try and draw the graphs to visualize this.
*October 7, 2014*

**Physics: momentum**

While you are standing on a expanse of smooth ice, your friend throws a heavy ball towards you. How can you maximize your speed after your interaction with the ball? a. More information is needed to determine how you should maximize your speed. b. It doesn't matter since ...
*October 7, 2014*

**physics**

Try and draw a free body diagram to help you understand this. The 35 m/s velocity is along the hypotenuse of a right triangle, and the components you want are in the x and y direction. To find the y component, you would use sinA=y/35, and for the x component, you would use ...
*October 7, 2014*

**Chemistry**

Yes that is what I arrived at as well.
*October 7, 2014*

**Chemistry**

To calculate the weighted atomic mass, you would use the percentages of the isotopes. Since the isotope is 55, its weight is 55. Since they are present in different amounts, you cannot just take the average, you have to do a weighted average using the percentages given. So, ...
*October 7, 2014*

**Physics**

That did not give me the correct answer.
*October 5, 2014*

**Physics**

A block of mass m = 4.30 kg slides along a horizontal table with speed v0 = 8.50 m/s. At x = 0 it hits a spring with spring constant k = 31.00 N/m and it also begins to experience a friction force. The coefficient of friction is given by μ = 0.150. How far has the spring ...
*October 5, 2014*

**Math**

Suppose an urn contains 10 balls numbered from 1 to 10. Someone draws 3 balls simultaneously from the urn (i.e. without replacement.) What is the probability that the lowest number drawn is 2? (8C3)/(10C3) but I know that is wrong. I also tried ((8C3)+(7C3)+(6C3))/(10C3)
*October 1, 2014*

**Statistics**

Suppose an urn contains 10 balls numbered from 1 to 10. Someone draws 3 balls simultaneously from the urn (i.e. without replacement.) What is the probability that the lowest number drawn is 2? (8C3)/(10C3) but I know that is wrong. I also tried ((8C3)+(7C3)+(6C3))/(10C3)
*September 30, 2014*

**6TH GRADE**

Thank you Ms. sue!
*September 24, 2014*

**6TH GRADE**

Describe a real-world situation that is modeled by multiplying two fractions or mixed numbers. Can someone give me an example?
*September 24, 2014*

**engineering science**

An object weighing 60N rest on a slope forming an angle of 17.5 degrees with the horizontal. A force of 44N parallel to the sloping surface just moves the object upwards. Calculate the frictional force.
*September 10, 2014*

**statistics**

A statistical analysis firm is hired to analyze the failure rate of a manufactured product. Which margin of error below would best indicate that the data used by the firm is a valid representation of the population? I don't understand the question they're asking me. ...
*September 7, 2014*

**science**

Need help with a summary of sexual an asexual reproduction
*September 4, 2014*

**Math**

so what is the answer
*August 24, 2014*

**Math**

You want to create an open rectangular box from a rectangular box. from a square piece of cardboard 20 inches by 20 inches. You will cut a 3 inch square from each corner. Draw a diagram and find the length of the box. Can someone help me with this diagram thing. I can't ...
*August 24, 2014*

**Math**

yes I got it right. Thankyou Ms.Sue (:
*August 24, 2014*

**Math**

A piece of fabric is 52 inches long. You cut the fabric into two pieces. The first piece is x inches long. The second is 14 inches longer than the first. Draw a diagram & solve for x.
*August 24, 2014*

**Math**

You want to create an open rectangular box from a rectangular piece of cardboard. The cardboard has length 14 in and you want to cut 2 in squares from each corner. Draw a diagram. What is the length of the box?
*August 24, 2014*

**Math**

the perimeter of a rectangular park is 1080 yds. The width of the park is 240 yds. What is the length of the park? What is the amount of grass that the township has to mow & fertilize?
*August 24, 2014*

**MATH HELP**

can you explain why?
*August 22, 2014*

**MATH HELP**

can you can why? detailed please
*August 22, 2014*

**MATH HELP **

shelley spent 17 min washing the dishes. she spent 38 min cleaning her room. explain how you can use mental math to find how long shelley spent on the two tasks?
*August 22, 2014*

**Science**

how to reduce the resistive force while freewheeling?
*July 24, 2014*

**math**

If the tax on an item is $16 and jerry wanted to buy two how much would the two items cost without the tax? Hint: Tax is 20% of the cost of the item.
*July 12, 2014*

**maths**

okay i got it!thanks!!
*July 12, 2014*

**maths**

why3x+3=0 ??
*July 12, 2014*

**maths**

Given(3x+3)/(6y+1)=3,find the value of7x/3y.
*July 12, 2014*

**Chemistry**

In aqueous solution, hydrochloric acid, HCl, and sodium carbonate, Na2CO3 react to produce gaseous carbon dioxide, CO2, water, H2O and sodium chloride, NaCl. A 10.0 g impure sample of Na2CO3 is dissolved completely in water; then treated with 3.00 mol L−1 HCl to evolve ...
*June 15, 2014*

**Science Please Help Me**

OK I just did the test and used these answers and they were all wrong and I'm so disappointed now and I don't know if my teacher will let me do it again but if I do get to do it again I will not use these answers
*June 3, 2014*

**English 8**

Infinitive phrase and how it is used My gram taught me to make lentil soup To make lentil soup infinitive I'm not sure if it is a noun or adv.
*May 20, 2014*

**English8**

Find infinitive phrase and tell if itis used as a noun adj or adv To have a balanced diet keep the food triangle in mind. To have a balanced diet is phrase. Is it an adverb
*May 20, 2014*

**math**

Andre picks a card at random. Without putting the first card back, he picks a second card at random. What is the probability that both cards will be hearts. The cards showing are three hearts and two diamonds
*May 8, 2014*

**math**

i dont understand what they are asking me to do when they give me a quhat looks like this (write acute,right,or obtuse for each angle 1.AFD 2.BFD and thers a bunch of line that intersect off to the side
*February 23, 2014*

**Physics**

A 30m high cylindrical water tank has a diameter of 14m. The tank is two-thirds full of water. What is the pressure at the bottom of the tank?
*February 19, 2014*

**math**

John had $24.He spent 2/3 of his money.How much he has left.
*January 30, 2014*

**Chemistry**

A solution is prepared by mixing 45.00 mL of 0.022 M AgNO3 with 13.00 mL of 0.0014 M Na2CO3. Assume volumes are additive. Calculate [Ag+], [CO32-], [Na+] and [NO3-] after equilibrium is established.
*November 15, 2013*

**Chemisty**

Consider a 1.50 L aqueous solution of 3.75 M NH3, where 17.5 g of NH4Cl are dissolved. To this solution, 5.00 g of MgCl2 are added. a. What is [OH-] before MgCl2 is added? b. Will a precipitate form? c. What is [Mg2+] after equilibrium is established? I don't need the ...
*November 14, 2013*

**physics**

The position of a particle moving along the x axis is given by x=3.0t^2 - 1.0t^3 , where x is in meters and t in seconds. What is the position of the particle when it achieves its maximum speed in the positive x direction
*November 14, 2013*

**Chemistry**

Thanks so much! I never would've figured that out.
*November 12, 2013*

**Chemistry**

A saturated solution of calcium chromate (CaCrO4) freezes at -0.10 C. What is Ksp for CaCrO4? Assume complete dissociation. The density of the solution is 1.0 g/mL.
*November 12, 2013*

**Chemistry**

When excess NaOH is added to Zn(OH)2, the complex ion Zn(OH)4 2- is formed. Determine the molar solubility of Zn(OH)2 in .10 M NaOH. Compare with the molar solubility of Zn(OH)2 in pure water. I thought I knew how to do this problem, but I'm not getting the right answer. ...
*November 10, 2013*

**Chemistry**

*To be entirely correct, you'll want to use the values for hydrogen and oxygen gas. I'll let you figure those out, along with the molar ratios for hydrogen gas and water and oxygen and water.
*November 9, 2013*

**Chemistry**

Using the molar masses of hydrogen and oxygen, you can discover your limiting reactant (the reactant that would produce the least water). The water produced by your limiting reactant would be the amount of water formed. (2.4 g H)(1 mol H/1.008 g)(1 mol H20/2 mol H)=1.19 mol ...
*November 9, 2013*

**Chemistry**

Use standards entropies and heats of formation to calculate delta Gf at 25C for a. cadmium (II) chloride (s) b. methyl alcohol, CH3OH (l) c. copper (I) sulfide (s) I really have no idea where to start with this problem. I have no idea how to calculate delta Gf, and everything ...
*November 9, 2013*

**Physics**

A daredevil decides to jump across a 15 m wide canyon on his motorcycle. The opposite side of the canyon is 3 m lower than the side the daredevil starts on. The daredevil drives his motorcycle off the cliff at a speed of 27 m/s. How long does it take the daredevil to cross the...
*October 17, 2013*

**Math**

j+4/6=8/12
*October 9, 2013*

**American History**

Why did the 21 amendment repeal the 18 amendment?
*October 8, 2013*

**calculus**

Find the derivative of the function. G(y) = (y − 1)3/ (y2 + 2y)7
*October 3, 2013*

**probability**

if you have a spinner with 3 parts. 1 white 2 blue. and you spin the spinner 90 times how many times do you expect the spinner to land on blue
*September 27, 2013*

**math**

Recently a census was taken on space station Gamma. Of the 100 residents interviewed, 75 traced their ancestry to the planet Omicron, 85 traced their ancestry to the planet Omega and 60 residents traced their ancestry to both planets. How many residents had ancestors from ONLY...
*September 3, 2013*

**geography**

We need help with finding Canada's fourteen capitals can u help us please
*August 18, 2013*

**Basic Physics**

2.5 h = 9000s 10m/s x 9000s = 90000m
*June 26, 2013*

**Government**

United States
*June 25, 2013*

**Government**

The President can choose to get rid of democracy. True or False?
*June 25, 2013*

**Math**

What is the integral of dx/(x^3-9x)? Please post steps too please!
*June 4, 2013*

**math**

Yes. Thank you.
*May 25, 2013*

**math**

If = sin-10.398, then =_____o_____' _____". Round to the nearest second.
*May 25, 2013*

**giving up**

i'm depressed that no-one has answered my science question so i'm giving up and i don't care if i fail my science because it will be all googles fault the only thing i know about the xenon 135 is that it's a tennis/squash racket and i needed the element xenon ...
*May 21, 2013*

**none**

read my question above
*May 21, 2013*

**Science**

Identify and describe the type of radiation emitted during the radioactive decay of the radioisotope xenon 135
*May 21, 2013*

**math**

a jar contains two red and five yellow marbles. A marble is drawn at random and then replaced. A second draw is made at random. find the probability that both marbles are red?
*May 15, 2013*

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