Tuesday

August 30, 2016
Total # Posts: 1,694

**chemestry**

the Earth has mass of approximately 5.98* 10^24kg and radius 6.38* 10^6m. what is the density of the Earth in (a)g/cm^3 and (b) kg/m^3 ?
*August 20, 2016*

**Chemistry**

Write chemical formulas for the compounds formed by the following positive and negative ions: Ba2+ and NO3-, Al3+ and Co3, and K+ and PO43-
*July 30, 2016*

**Chemistry**

thanks dude
*July 29, 2016*

**Chemistry**

If you start with 4.00 moles of C3H8 (propane) and 4.00 moles of O2, how many moles of carbon dioxide can be produced?
*July 29, 2016*

**Chemistry**

what??
*July 28, 2016*

**Chemistry**

A glass of water contains 1.2 x 1024 molecules of water. An additional 4.0 moles of water are poured into the glass. How many moles of water are in the glass?
*July 28, 2016*

**Chemistry**

In the reaction C + O2 → CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction?
*July 6, 2016*

**Chemistry**

The Ka of an acid is 1.3 x 10–7. Based on the Ka and its relationship with Kw, what is the value of Kb?
*June 20, 2016*

**math**

How many 1oz bottles will this solution fill.
*June 15, 2016*

**College Algebra math**

A plane flies due east for 35 miles and then due south until it is 37 miles from its starting point. How far south did the plane fly?
*May 23, 2016*

**Chemistry**

Ammonia gas is passed into water, yielding a solution of density of 0.93 g/mL and containing 18.6% NH3 by weight. What is the mass of NH3 per mL of solution.
*May 22, 2016*

**Chemistry**

A sample of impure Limestone weighing 0.3440 g was treated with 50 mL of HCl 0.1363 mol/l. after elimination of all CO2 by boiling, excess acid was created by 4.45 mL of NaOH 0.1445 mol/L1. Calculate the% (w/w) of CaO and CaCO3 in the sample
*May 21, 2016*

**math**

What is the 20th term of the sequence that begins with −2, 4, -8, 16 ANSWER CHOICES: A)2,097,152 B)524,288 C)-524,288 D)1,048,576
*May 17, 2016*

**Geography -Yr10**

Q: List the impacts of reduced river flows that were identified within the Murray-Darling Basin in the 1980s. . Thanks
*April 30, 2016*

**Geography -Yr10**

Outline the reasons for competition over the Murray River's water resources in the late nineteenth century. I found nothing online for this question?
*April 30, 2016*

**Geography - Yr10**

In what ways is the Local Council involved in land management? What are they mainly responsible for?
*April 29, 2016*

**Math **

15purple marbles,3 pink marbles, and 12 gray marbles ratio of purple marbles to all marbles
*April 27, 2016*

**Chemistry**

Knowing that the milk of magnesia contains 8 g% of Mg (OH)2, using 1 g of milk of magnesia and added 50 mL of 0.100 M HCl, determine the required volume of a solution of 0.105 M NaOH to titrate the excess HCl 0.100 M.
*April 25, 2016*

**Math**

by completing the square, what value should you add to each side of the equation? x^2- 7x=5
*April 24, 2016*

**MATH**

If you roll a 6 sided dice 6 times, what is the best prediction possible for the number of times you will roll a two? A) 6 B) 1 C) 2 D) 0
*April 20, 2016*

**Chemistry**

Which pair of compounds will form a solution?Benzene (C6H6) and hexane (C6H14)Na2SO4 and benzene (C6H6)NaCl and hexane (C6H14)H2O and CCl4More than one of the combinations above will form solutions.
*April 19, 2016*

**PHYSICS **

Mars rotates slowly about its axis, the period being 687 days. The mass of mars is 6.39 x 10^23 kg. Determine the radius for a synchronous satellite in orbit around Mars. (assume circular orbit)
*April 16, 2016*

**Chemistry **

If it takes 45 days for 80.0 mg of a particular radioactive isotope to decay to 10.0 mg what is its half-life?
*April 7, 2016*

**Chemistry**

Calculate the concentrations of Cd ⁺ ², [Cd (CN)₄-²] and CN at equilibrium when they dissolve mole of 0.42 Cd (in the ₃)²⁺ 2.50 M. Given: Kf = 7, 1 x 10 ^16
*April 4, 2016*

**Chemistry**

What is the pH of a solution made by mixing 1.40 mL of 0.0043 molar Sr(OH)2 with 8.90 mL of 0.0029 molar Sr(OH)2 solution?
*March 31, 2016*

**math**

peggy was taking a timed 90 question test she was able to correct 90% of the questions how many questions did she answer correctly
*March 30, 2016*

**Chemistry**

Consider the chemical equation. 2H2 + O2 -> 2H2O What is the percent yield of H2O if 87.0 g of H2O is produced by combining 95.0 g of O2 and 11.0 g of H2? a 56.5% b 59.0% c 88.5% d 99.7%
*March 23, 2016*

**Chemistry**

thanks DrBob222 =)
*March 23, 2016*

**Business **

A department manager is attempting to motivate employees by moving them from one job to another. What is this strategy called? A. Job enlargement C. Job rotation B. Job enrichment D. Job justification
*March 19, 2016*

**Physics**

A 4kg box is attached to a 2.4m rope rotating on platform. Max tension can withstand without breaking is 140N. 1.) Find Max. speed w/ which the box can rotate if the surface of platform is frictionless. 2.) Find Max speed w/ which box can rotate if Coeff. of friction between ...
*March 17, 2016*

**math**

7 over x + 8 equals 6/2 x solve for x show work and how can I get some help with this question results now
*March 9, 2016*

**Math**

Explain how you know that 21/30 is greater than 2/3
*March 8, 2016*

**english**

What the does the mask in Paul Dunbar's poem "We Wear the Mask" represent? or B.
*February 26, 2016*

**english**

Which of the following did NOT contribute to the Harlem Renaissance? A.The Emancipation Proclamation. B. By 1930, the population of African Americans in Harlem grew to over 200,000. C.F. Scott Fitzgerald <-- All Harlem Renaissance writers wrote literature about suffering, ...
*February 26, 2016*

**Ms.sue plz help**

Please.
*February 26, 2016*

**English**

Which of the following did NOT contribute to the Harlem Renaissance? A.The Emancipation Proclamation. B. By 1930, the population of African Americans in Harlem grew to over 200,000. C .F. Scott Fitzgerald I meant A. sorry..
*February 26, 2016*

**English**

Which of the following did NOT contribute to the Harlem Renaissance? A.The Emancipation Proclamation. B. By 1930, the population of African Americans in Harlem grew to over 200,000. <-- C.F. Scott Fitzgerald All Harlem Renaissance writers wrote literature about suffering, ...
*February 26, 2016*

**Math (check plz)**

#2 ... D?
*February 25, 2016*

**Math (check plz)**

y = 2x + 4 2x - y = 6 Solve the system of equations using substitution. A) (2,8) B) (2,-8) C) (10,24) D) no solution <-- 4x + 3y = 6 -4x + 2y = 14 olve the system of equations. A) x = 1/2, y = 3 B) x = 3, y = 1/2 <-- or D? C) x = 4, y = -3/2 D) x = -3/2, y = 4
*February 25, 2016*

**Health**

I think it's A.
*February 19, 2016*

**Health**

What happens when anabolic steroids are used in high doses? A. Increases irritability and aggression B. Decreases irritability and aggression C. Increases feelings of complacency D. Decreases feelings of complacency
*February 19, 2016*

**life orientation**

By using posters
*February 17, 2016*

**english**

If there is practice after school on Friday, I can drop the kids off and you can pick them up.
*January 29, 2016*

**Calc help!**

its x/(x-3) - (x+1)/(x+3) How did you get that answer?
*January 25, 2016*

**Calc help!**

what would be the answer to this question? The answer i got isn't one of the choices: (x/x-3) - (x+1/x+3) I got 1/x+3
*January 25, 2016*

**Maths**

John had €120 he spent 3/4 of it how much did he spend
*January 25, 2016*

**Chemistry**

A mass of 0.100 mg TIOH is mixed with 174 ml of pure water. Calculate the pH of this aqueous solution?
*January 23, 2016*

**stats**

One company produces movie trailers with mean 150 seconds and standard deviation 40 seconds, while a second company produces movie trailers with mean 120 seconds and standard deviation 30 seconds. What is the probability that two randomly selected trailers, one produced by ...
*January 22, 2016*

**Chemistry**

A can of soda has the total volume of 350ml. This can is open and only contains atmospheric air, and is placed within a furnace 100 ° C. After the can achieve this reduced temperature at 25 ° C. With decreasing temperature, there is a reduction of the internal pressure...
*January 22, 2016*

**Chemistry**

Thank you :D
*January 20, 2016*

**Chemistry**

A concentration of PCL5(g),4,0 mol/L, verifies that the process PCl5(g) = PCl3(g) + Cl2(g) is achieved with a degree of balance of 20% Calculate the equilibrium of the reaction constant
*January 20, 2016*

**Chemistry**

When iron reacts with copper (2) chloride, one of two possible reactions take place: Fe(s) + CuCl2(aq) to FeCl2(aq)+Cu(s) OR 2Fe(s) + 3Cucl2(aq) to 2FeCl3(aq) + 3Cu(s)... What charge does the iron atom have carry in each of the two possible products FeCl2 vs. FeCl3.
*January 19, 2016*

**math(epidemiology)**

Thank you for your help Steve, I used that equation and got 810py but I assumed my answer was wrong because I got such a big number.
*January 18, 2016*

**math(epidemiology)**

A population of 100 healthy men was followed for the development of prostate cancer. After being followed for 5 years, 20 men developed prostate cancer. Ten other men were followed for 1 year and then were lost to follow-up. The remaining men who never developed the disease ...
*January 18, 2016*

**Math**

Is 4000 cups < 400 qt? Here is my answer 400 quarts = 1600 cups.
*January 10, 2016*

**college question**

It says each academic year, but I'm not sure if it means at the end of the first semester or second
*December 17, 2015*

**college question**

Hello, I have a question about scholarships in college. I know you need to maintain a certain gpa to keep a scholarship, but do you need to keep that gpa at the end of each semester, or at the end of each academic year?
*December 17, 2015*

**math**

Given that x+2y=4,determine the minimum value of x^2+xy-y^2.
*December 12, 2015*

**Science**

I have a picture of a boat sailing over a wave. I have arrow A at the front of the boat going down to the ocean floor and there's the boat at the bottom, which is marked B, the arrow then starts back up to the back of the boat and is labeled C. They want to know what is ...
*December 10, 2015*

**Chemistry**

150 g of water at 80 degree Celsius is cooled to 50 degree Celsius how much heat is lost bye the water
*December 6, 2015*

**Math**

Mr Lopez owns a home that sits on 7/8 of an acre. He has decided to plow up 1/4 of the property to create a garden. What fraction of an acre will he plow up?
*December 1, 2015*

**Math**

Jasmin needs 3/8 yard of fabric for each stripe of a striped quilt she is making. There are 14 stripes on the quilt. How many yards of fabric does Jasmin need?
*December 1, 2015*

**physics**

what is the acceleration of a car going 25m/s on a cloverleaf with a radius of 45 m?
*November 20, 2015*

**Physics**

A car accelerates from rest with a uniform acceleration of 1.7m/s for 10 seconds, its acceleration then reduces by 0.3m/s for 20 seconds of the motion, it then maintains the speed attained for another 20 seconds after which it decelerates to rest within 10 seconds. Draw the ...
*November 11, 2015*

**FINANCE**

WHAT IS THE VALUE OF A $100 PAR PREFERRED STOCK THAT MUST BE RETIRED AFTER 10 YEARS IF IT PAYS A DIVIDEND OF $5 ANNUALLY AND THE INVESTOR REQUIRES A 6 PERCENT RATE OF RETURN
*November 5, 2015*

**Math**

I need help please: Express in symbols:"Six decreased by the product of a number and six is twenty."
*October 24, 2015*

**math **

msrcus wants to buy 5 baseball cards. he has $35 what is the most each card will cost? write inequality to solve
*October 19, 2015*

**science**

what is the main difference between lava and magma?
*October 13, 2015*

**Physics**

Determine the stopping distances for a car with an initial speed of 93 km/h & human reaction time of 0.80 s, for an acceleration a=−4.0m/s2.?
*October 12, 2015*

**Math**

The answer is B. This is because when u subtract 4y to get it on the other side it cancels with the other 4y giving u 0=-11 which is an incorrect statement. for C) u get 14z= -11 and z is =/-11/14
*October 12, 2015*

**Math**

subtract 2 from the right side to get 5x=6x+9 then subtract 6x to get -1x=9. divide by 1 to get x=-9. this make the equation true. Therefore it is open.
*October 12, 2015*

**Science Urgent😖😖😖**

I would say it is C
*October 12, 2015*

**business econ**

What is the break even in units? Bottle, Label and Production (direct material and labor) = $9.12 per 12 oz. can Advertising & promotion (fixed) = $218,000 Company Overhead (fixed) = $354,000 Formula I'm using: Breakeven in units (BEU)= total fixed cost / (unit price –...
*October 12, 2015*

**Mathmatics**

A sc tourists bureau survey showed that 75 % of those who seek information about the state actually come to visit . The office received 8 requests for information. What is the probability that probability that 4 to 6 inclusive of the people will visit sc?
*October 11, 2015*

**Calculus**

I've done everything I can think of to solve this, but I have no idea. Find the derivative: y = sq rt{11x + sqrt[11x + sqrt(11x)]}
*October 7, 2015*

**Calculus**

A mass on a spring vibrates horizontally on a smooth level surface (see the figure). Its equation of motion is x(t) = 8 sin t, where t is in seconds and x is in centimeters. The first part of the question is to find the velocity and acceleration equations, which I got to be: v...
*October 6, 2015*

**Intro to Undergraduate Studies**

Does the sentences below need to be cited? Why or why not? Bill Gates is the founder of Microsoft. Students who studied two hours a day did 25% better in the final exam.
*October 6, 2015*

**Calculus**

The equation of motion of a particle is s = t3 − 12t, where s is in meters and t is in seconds. For the velocity function, I got v(t)=3t^2-12 and for acceleration, a(t)=6t. The final question is: Find the acceleration when the velocity is 0. How do I do that?
*September 29, 2015*

**Calculus**

Find the limit as x approaches infinity. sqrt(81x^2 + x)− 9x. I've worked this two different ways and have gotten 0 and 1/9, neither of which is the right answer according to the homework system??
*September 14, 2015*

**Calculus**

I misread the question!! I was thinking that setting it equal to 0 would be something completely different. Thank you so much!
*September 14, 2015*

**Calculus**

If a rock is thrown upward on the planet Mars with a velocity of 19 m/s, its height (in meters) after t seconds is given by H = 19t − 1.86t^2. When will the rock hit the surface?
*September 14, 2015*

**Algebra**

Find the domain of the function. (Write your answer using interval notation.) sqrt(x)/ (4x^2 + 3x − 1) If you set the bottom equal to zero, I got that x can't be -1 or 1/4. But I'm not sure if that's right, or how to write the answer in interval notation.
*September 12, 2015*

**Algebra**

Find the domain of the function. Write in interval notation. sqrt(x^2 − 64). For the answer, I got (-infinity, -8)u(8, infinity), but that's wrong, and I'm not sure what else to try?
*September 12, 2015*

**Calculus**

If a ball is thrown into the air with a velocity of 34 ft/s, its height (in feet) after t seconds is given by y = 34t − 16t^2. Find the velocity when t = 1.
*September 10, 2015*

**Calculus**

If a ball is thrown into the air with a velocity of 40 ft/s, its height in feet t seconds later is given by y = 40t − 16t^2. Find the average velocity for the time period beginning when t = 2 and lasting for each of the following. 1) 0.5 seconds.
*September 9, 2015*

**Calculus (limits)**

The question is to "state the value of each quantity, if it exists." We are given a piecewise function that is graphed, and no equation. What does it mean when we're asked to find f(2)?
*September 3, 2015*

**Math**

A rock is thrown upward with a velocity of 12 meters per sec from the top of a 25 meter high cliff and it misses on it's way back down. When will the rock be 3 meters from water
*September 1, 2015*

**Algebra-domain**

I had to find the domain of a function, and my answer is that x is all real numbers except -5 and 6. How do I write that in interval notation?
*August 31, 2015*

**math**

Factor the expression: x^3-4x^2-4x+16. I ended up getting x^3-4(x^2+x-4), but can I take it farther than that?
*August 31, 2015*

**Algebra**

I have another one What is the value of 42-2(3x5+1)? I thought you worked the parentheses first which would be 16, then subtract 42 from 2 and you get 39, you would then multiply 16x39 and you would get 624. But the answers I have to choose from are 8, 1, -16 and -21. What am ...
*August 26, 2015*

**Algebra**

Which equation represents "fifteen more than r is sixty-one? a. r + 61 = 15 b. r + 15 = 61 c. r - 15 = 61 d. r + 61 = 15 I think its b or c because b is 46 and c is 76
*August 26, 2015*

**Geometry**

Help! I don't understand this problem Find the angle of rotation that maps point P (1,0) on to P'. What are the x and y coordinates of point P' to the nearest thousandths? Determine a translation rule that maps point P onto P'.
*August 22, 2015*

**Language Arts**

What is the most important element of the plot of Lord of the Rings? a) the elves sailing away on ships b) Galadriel's gifts of magic c) the journey to destroy the ring or d) the journey to Rivendell. I think it is C) the journey to destroy the ring.
*August 18, 2015*

**physics**

500n and 100n
*July 7, 2015*

**Finance**

If a firm buys on trade credit terms of 3/10, net 50 and decides to forgo the trade credit discount and pay on the net day, what is annualized cost of forgoing the discount (assume a 360-day year)? The annualized cost of the trade credit terms of 3/10, net 50 is ___%
*June 15, 2015*

**math**

**Problem 3: Create a linear function (y=mx+b) and graph the line for the following set of data. x | y 2 | 1 4 | 2 6 | 3 First, use the slope formula to find slope: (y2-y1)/(x2-x1) Then, put the slope (m), a 'y' point, and matching 'x' point into the formula y=...
*May 15, 2015*

**English**

Where does the comma go in these sentences? 1. Usually castles sat on a hilltop, and had high stone walls. 2. Loo at this picture of a castle Cate.
*April 19, 2015*

**Redox Reaction**

In an acidic solution, manganese(II) ion is oxidized to permanganate ion by bismuthate ion, BiO3-. In the reaction, BiO3- is reduced to Bi3+. How many milligrams of NaBiO3 are needed to oxidize the manganese in 30.2 mg of manganese(II) sulfate?
*April 19, 2015*

**Stream Physics Hydrology - HELP!!!!**

1a) An aqueous solution containing 35 kg of endosuflan insecticide is accidentally released into a small stream. The stream dimensions are 17.5 meters wide and 1.15 meters deep. The stream velocity is 1.1 m/s. The stream channel drops 24m over a distance of 10 km. Endosuflan ...
*April 17, 2015*