Saturday

April 30, 2016
Total # Posts: 1,214

**Math**

How can i find misleading graphs on the news online??
*April 27, 2016*

**math**

write an expression that represents how much you would make per hour on holidays if you earned time and a half (40 hours for 50 weeks)
*April 25, 2016*

**Chemistry please help**

A general reaction written as 1A + 2B --> C + 2D is studied and yields the following data: Expt (A). (B) initial (C)/t 1. 0.150. 0.150. 8.00 x10^-3 2. 0.150. 0.300. 1.60 x10^-2 3. 0.300. 0.150. 8.00 x10^-3 What is the order of the reaction with respect to B? What is the ...
*April 25, 2016*

**Chemistry**

The average rate of disappearance of ozone in the reaction 2O3(g) ---> 3O2 (g) is found to be 8.12 x 10^-3 molecules over 15 seconds. What is the rate of appearance of O2 during this interval
*April 24, 2016*

**Math please help**

I don't understand?
*April 24, 2016*

**Math please help**

My values: 0.012 0.008 0.005 0.0035 0.0025 0.002 0.0018 0.0017 For a graph.. What scale on the x axis should I go by to plot these values... The time is the y axis which I know the scale... But I can't think of a scale to go by for these values
*April 24, 2016*

**Chemistry**

Given info: Time(s). (ClO) mol/L 0.0. 0.012 4.0. 0.008 8.0. 0.005 12.0. 0.0035 16.0. 0.0025 20.0. 0.002 24.0. 0.0018 28.0. 0.0017 Calculate the average rate of the overall reaction
*April 24, 2016*

**STATS**

A survey found that 36% of students still enjoy doing research in a library. A random sample of 326 students showed that 105 of them will continue to go to library. If the critical value is -1.65 what is your decision.
*April 24, 2016*

**Chemistry**

How do I answer this question? The average rate of disappearance of ozone in the reaction 2O3 --> 3O2 is found to be 8.12 x 10^-3 molecules over 15 seconds. What is the rate of appearance of O2 during this interval?
*April 22, 2016*

**Chemistry**

Two electron configuration: Mg(Ne)3s^2 Zn(Ar)4s^2 3d^10 Using the configurations, explain the difference in relative reactivity of the 2 metals ( which are Mg and Zn)
*April 19, 2016*

**Chemistry **

Two electron configuration: Mg(Ne)3s^2 Zn(Ar)4s^2 3d^10 Using the configurations, explain the difference in relative reactivity of the 2 metals ( which are Mg and Zn)
*April 19, 2016*

**Chemistry**

Two electron configuration: Mg(Ne)3s^2 Zn(Ar)4s^2 3d^10 Using the configurations, explain the difference in relative reactivity of the 2 metals ( which are Mg and Zn)
*April 19, 2016*

**Chemistry**

Use the collision theory to explain the increase in rates of the other reactions
*April 19, 2016*

**Chemistry**

Write balanced reaction for the following metal acid reaction A) Mg and HCI B) Zn and HCI
*April 18, 2016*

**English**

Writing a haiku about a cellphone
*April 15, 2016*

**math**

My values are: 0.075 0.025 0.1 0.075 0.1 0.125 0.05 0.125 0.025 0.15 0.125 0.025 What would be an appropriate scale to go by on a bar graph.@bobpursely suggested 40:1 what does this mean???
*April 13, 2016*

**Math**

My values are: 0.075 0.025 0.1 0.075 0.1 0.125 0.05 0.125 0.025 0.15 0.125 0.025 What would be an appropriate scale to go by on a bar graph.
*April 13, 2016*

**Chemistry**

How do I calculate the heat released by 1 mole MgO Given: 0.5 g of MgO Heat gained by acid is 1337.6 kJ I calculated the moles for MgO which I got 0.0125 I'm not sure if I'm on the right track..
*April 12, 2016*

**Chem**

How do I calculate the heat released by 1 mole MgO Given: 0.5 g of MgO Heat gained by acid is 1337.6 kJ I calculated the moles for MgO which I got 0.0125 I'm not sure if I'm on the right track...
*April 12, 2016*

**Chemistry please help!**

The reaction through which carbon changes from graphite to diamond form is represented by the equation C(graphite) ---> C(diamond) delta H: ? Using the reactions below, determine the amount of heat absorbed in the change of one mole of graphite to one mole of diamond C(...
*April 7, 2016*

**Chemistry please help**

The reaction through which carbon changes from graphite to diamond form is represented by the equation C(graphite) ---> C(diamond) delta H: ? Using the reactions below, determine the amount of heat absorbed in the change of one mole of graphite to one mole of diamond C(...
*April 7, 2016*

**Chem**

The reaction through which carbon changes from graphite to diamond form is represented by the equation C(graphite) ---> C(diamond) delta H: ? Using the reactions below, determine the amount of heat absorbed in the change of one mole of graphite to one mole of diamond C(...
*April 6, 2016*

**Chemistry**

Calculate the enthalpy of formation of maganese (IV) oxide based on the following information. 4Al(s) + 3MnO2(s) --> 3Mn(s) + 2Al2O3(s) Delta H = -1790 kJ 2Al(s) + 3/2O2 (g) ---> Al2O3 (s) Delta Hf = -1676 kJ
*April 6, 2016*

**Chemistry**

So i would change the sign of the second equation and add them?
*April 5, 2016*

**Chemistry**

The reaction through which carbon changes from graphite to diamond form is represented by the equation C(graphite) ---> C(diamond) delta H: ? Using the reactions below, determine the amount of heat absorbed in the change of one mole of graphite to one mole of diamond C(...
*April 5, 2016*

**Chem**

How did u get 4.186 kj?
*April 5, 2016*

**Chem**

Compound B is burned in a bomb calorimeter that contains 1.50 liters of water. When I burned 50.0 grams of compound B in the calorimeter, the temperature rise of the water in the calorimeter was 35.0 degrees C. If the heat of combustion of compound B is 2,150 kJ/mol, what is ...
*April 5, 2016*

**Chemistry**

Consider the following three reactions: Ca(s) + 2H2O(l) ---> Ca2+(aq) + 2OH^- (aq) + H2(g) CaO(s) + H2O(l) ---> Ca2+ (aq) + 2OH^- (aq) H2(g) + 1/2O2 (g) ----> H2O (l) Delta H = 430.75 kJ Delta H = 81.55 kJ Delta H = 285.63 kJ Determine Delta H for the overall reaction...
*April 5, 2016*

**Chemistry**

How much energy will be liberated upon the combustion of 12.5 grams of ethene? C2H4(g) + 3O2(g) ----> 2CO2(g) + 2H2O(g) Delta H = -1387.4 kj
*April 4, 2016*

**Need ideas**

It is for Religion class... Grade 12.. we are just supposed to explain the topic and connect it to the Catholic Church...
*April 3, 2016*

**Need ideas **

I am doing a presentation on Consumerism... I need ideas on activities that have to do with Consumerism I can do with the class... To engage them
*April 3, 2016*

**Religion**

How does St.Therse of Lisieux exemplify the qualities from the parable the Good Samaritan
*April 1, 2016*

**life orientation**

No guys plz help with answer not wat u r doing and let's help each other plz plz plz
*March 31, 2016*

**Math **

I need help coming up with a unique game that can be played at a carnival, amusement park or casino.... and u need to be able to explain the probabality of your game. Any ideas
*March 30, 2016*

**maths**

A.If 0 is less than or equal to thita is less than 360 ,find all possible value of thita such that : 1.Sin thita =0.5623
*March 29, 2016*

**English **

I have to write a point form outline for a short story... i need to start with a flashblack but not sure how? the topic: Your main character is an easy going 74-year old woman. The story begins in a doctors surgery. Your character is determined to get to the truth.
*March 26, 2016*

**Math**

The game of euchre uses the 10s, jacks,queen,kings and aces from a standard deck of 52 cards. How many 5-card euchre hands have at least 2 red cards? Explain your reasoning. What is this question asking me to find, this is what I don't understand
*March 21, 2016*

**Math**

You are setting up a system of programming codes for a universal TV remote. Each code will have five digits and cannot include a 0 or repeat any digits. How many codes: A) do not contain a 1? My answer: 8x7x6x5x4 = 6720 codes B)have 2 as the 2nd digit and 4 as the fourth digit...
*March 21, 2016*

**Math**

Expand (3-x)^7 Would i start like (3)^7(-x)0 etc....
*March 20, 2016*

**Math**

For a calculus quiz, the teacher will choose 11 questions from the 15 in a set of review exercises. How many different sets of questions could the teacher choose
*March 20, 2016*

**Math **

How many different sums of money can U make with 4 pennies, two nickels and six quarters
*March 20, 2016*

**Math**

Find the middle term in the expansion of (2x+3y)^12
*March 19, 2016*

**Prob**

A game is played using three 6-sided dice. You throw these dice one time and if the dice all show the same number ( triples), you win $ 40.00 . For this game to be “fair”, how much should a person pay to play this game ?
*March 19, 2016*

**Math**

In the expansion of (ax +by)^8, the first three terms are 256x^8, 6144x^7y and 64512x^6y^2. Find the values of a and b
*March 18, 2016*

**Math**

A new theme park will have five roller coasters, six water rides and eight suspension rides. How many different combinations of rides could you try at this park.
*March 18, 2016*

**Data management check **

A fabric store has 44 bolts of fabric on its clearance table. Of these bolts 28 are broadcloth, 17 floral prints, 22 have a blue background, 12 floral prints on broadcloth, 10 arare broadcloth with a blue background, and 5 are floral prints with blue background. If all but 2 ...
*March 18, 2016*

**Data Management check**

A fabric store has 44 bolts of fabric on its clearance table. Of these bolts 28 are broadcloth, 17 floral prints, 22 have a blue background, 12 floral prints on broadcloth, 10 arare broadcloth with a blue background, and 5 are floral prints with blue background. If all but 2 ...
*March 16, 2016*

**Data Management **

You are thinking of using some leftover ceramic tiles to make a decorative border for a patio. You have ten blue, four gold, and six white tiles. In how many ways can you make the border if it requires 15 tiles and you use only blue and white ones? Explain your reasoning. i ...
*March 16, 2016*

**Data Management (need help)**

Suppose that the SJCS and Mary Ward are in the basketball final. In this best-of-three series, the winner is the first team to win two games. There are 60% chances SJCS TEAM will win first game. If SJCS wins, there are a 70% chance of winning next game and if they lose there ...
*March 9, 2016*

**Math **

From the top of an 8m house the angle of elevation to the top of the schools flagpole across the street is 9 degrees The angle of depression is 42degrees to the bottom of the pole How tall is the flagpole
*March 8, 2016*

**Chemistry**

If you make a solution in the laboratory that contains 0.1 M acetic acid (CH3COOH), what concentration of hydronium will you have once the solution equilibrates?
*February 29, 2016*

**Chemistry**

If you make a solution in the laboratory that contains 0.1 M hydrochloric acid, what concentration of hydronium will you have?
*February 29, 2016*

**Chemistry**

What is the strongest intermolecular force present in each molecule: H2S CF4 NH3 CS2 PCL3 N CH2O C2H6 CH3OH BH3 My work: Hydrogen bonding London dispersion Dipole dipole London dispersion Dipole dipole London dispersion Hydrogen bonding Hydrogen bonding Hydrogen bonding Am I ...
*February 28, 2016*

**English**

Identify the sentence with the correct end punctuation. 1.did you see the elephants 2.I saw a baby kangaroo 3.who found the way to the penguins 4.I miss the monkeys
*February 28, 2016*

**history**

What were arguments for maintaining the slave trade and slavery in general during the Constitutional Debates on Slavery? How did the delegates from Georgia and South Carolina in particular impact the debate?
*February 27, 2016*

**Math**

At a school of 1400 students, 800 are currently enrolled in English, 740 are enrolled in mathematics and 325 are enrolled in both subjects. How many students are enrolled neither English nor Mathematics? I got 650 is this right?
*February 23, 2016*

**Math **

A game show has three doors labelled A,B, and C behind which there may or may not be a prize. A group of contestants are asked behind which doors they think there is a prize. The results are that 18 people choose A, 19 people choose B, 19 people choose C, 4 people choose A and...
*February 23, 2016*

**Social Studies**

@Ms. Sue
*February 9, 2016*

**Social Studies**

Answer the following about the great wall of china: a.When, where, and why did it develop? b.How was it used or practiced? c. Whom did it affect? d.What was the lasting impact this innovation had on China and its people? e.What are some modern examples of the concept or product?
*February 9, 2016*

**math**

How would i solve for n nP5 = 14(nP4)
*February 7, 2016*

**math**

Solve the equation for n n!/(n-2)! = 90 I get n= 10 but when i plug 10 back into the equation i dont get 90 to check... My work: n!/(n-2)! =90 n(n-1)(n-2)/(n-2)! =90 i cancelled the n-2 and expanded the n(n-1) n^2 -1n -90 =0 (n-10)(n+9) = 0
*February 7, 2016*

**Math**

An explicit solution of a differential equation is: a) a simpler equation b) a real number c) a function on some domain d) an approximation e) a linear relation
*February 2, 2016*

**Data Management**

Simplify x^2 - xy + 2x/2x
*February 1, 2016*

**Physics **

a spring extends by 10 cm when a mass of 100g is attached to it. what is the spring constant?
*January 27, 2016*

**math**

The ratio of four less than a number to twenty six more than the number is 1:3 . what is the number?
*January 24, 2016*

**Operations**

Its McDonald's
*January 23, 2016*

**Operations**

We are talking for example McDonald's how does their work force reflect their global strategy?
*January 23, 2016*

**Operations**

Could someone what do they mean by this question please.How does their work force reflect their global strategy?
*January 23, 2016*

**Math connexues**

what are your awnsers? i cant check them with out seeing what you choose
*January 22, 2016*

**algebra**

the sum of two numbers is 6 more than three times the smaller and and their sum is 66. what are the numbers?
*January 22, 2016*

**global studies**

this is a 20 question project and i could really use a lot of help :)
*January 21, 2016*

**global studies**

some polynewian islands are ring- shaped coral islands that surround a body of wate, or? a.)copra b.) coral c.)atolls d.)plates
*January 21, 2016*

**Math**

Find 5 ordered pairs that satisfy each relation. Draw each graph. 4. x+y=7 5. x+y=6 6. x-y=1 7. x-y=0 8. x+y=0 9. y-x+0
*January 10, 2016*

**Maths**

A ship is sighted from the top of a lighthouse. The angle of depression from the lighthouse to the top of the ship is 45 degrees. The distance from the top of the lighthouse directly to the ship is 4 miles. Calculate the horizontal distance of the ship from the bottom of the ...
*January 7, 2016*

**Biology**

When inserting a gene, a gene for antibiotic resistance were also added to the plasmid. Why is this done?
*January 5, 2016*

**Biology**

Explain the ramifications to the process of transcription if the following occurs: A) The termination sequence of a gene is removed
*January 1, 2016*

**Biology**

3'-GGCACTCGCATAATATTCGCCATGGCT -5' In the DNA sequence above, how do i identify the promoter region..
*December 31, 2015*

**math**

K is 9 years older than L after 7 years the total of their age is 93 so how old are they in each one of them?
*December 26, 2015*

**Biology**

What effects does epinphrine have on the excretory and endocrine systems.. i cant find any sites to help
*December 15, 2015*

**Math**

Thank you very much, happy holidays
*December 5, 2015*

**Math**

Solve simultaneously for the two equations for x and y 5x(cos 45) + 15y(cos 30) = 2,000 5x(sin45) - 15y(sin 30) = 0 I tried adding these two eqn. to elimate y and solve for x by adding [5 x cos 45] and [5 x sin 45] but the value for x is too high. Would I have to use trig ...
*December 5, 2015*

**Physics**

Search The statue of Isaac Newton is crated and moved from the Oxford Museum of Natural History and Science for cleaning same question there
*December 5, 2015*

**Physics**

Using W=mg W = (60 kg)(9.81m/s^2) = 558.6 N Weight = mass x surface gravity W (Mars) = (60 kg)(6.42x10^23)= 3.85 x 10^25 W (Saturn) = (60 kg)(5.69x10^26)= 3.41 x 10^28
*December 5, 2015*

**Math**

A drug in the bloodstream has a concentration of c(t) =at/t^2 +b A= 3, b=1 Determine how long it takes for the drug to drop below 0.2 solve algaebraically Find algaebraically when c(t) less then 0.5
*November 30, 2015*

**Math**

A rectangular box with a square base of length x and height h is to have a volume of 20ft^3. The cost of the top and bottom of the box is 20 cents per square foot and the cost of the sides is 8 cents per square foot. Express the cost of the box in terms of: The variable x and ...
*November 30, 2015*

**Math**

The question also states to determine how long it takes for the medicine to drop below 0.2 how could i do this
*November 30, 2015*

**Math**

How would i approximate the highest concentration reached in the bloodstream
*November 30, 2015*

**Math **

A medicine in the bloodstream has a concentration of c(t) =at/t^2 + b where a=3 and b=1 Approximate the highest concentration of the medicine reached in the bloodstream Find algebraically when c(t) less then Sign 0.5
*November 30, 2015*

**math**

A drug in the bloodstream has a concentration of c(x) =3t/t^2 + 1 Approximate the highest concentration of the drug reached in the bloodstream Determine how long it takes for the drug to drop below 0.2. Solve algaebraically
*November 29, 2015*

**Math **

A drug in the bloodstream has a concentration of c(x) =3t/t^2 + 1 Approximate the highest concentration of the drug reached in the bloodstream Determine how long it takes for the drug to drop below 0.2. Solve algaebraically
*November 29, 2015*

**Physics**

true or false.Initial velocity is always equal to zero
*November 29, 2015*

**Math**

A drug in the bloodstream has a concentration of c(x) =3t/t^2 + 1 Approximate the highest concentration of the drug reached in the bloodstream Determine how long it takes for the drug to drop below 0.2. Solve algaebraically
*November 28, 2015*

**Biology**

How can i design an experiment to determine which wavelengths of light provide the optimal energy for photosynthesis
*November 26, 2015*

**Biology**

How do you think increasing temperature would affect the rate of photosynthesis?
*November 26, 2015*

**chemistry**

how many grams of CaCO3 will dissovle in 300ml of 0.05M Ca(NO3)2 ? Ksp of CaCO3 : 4.7x10^-9 M.W of CaCO3 100.01g/mol
*November 21, 2015*

**Math**

Thank you
*November 17, 2015*

**Math**

that is the answer that I got mixed number 1 13/30 but do you covert this to hour
*November 17, 2015*

**Math**

On Monday morning, Rosie naps for 3/5 hour. In the afternoon for 5/6 hour. How long does he sleep in all?
*November 17, 2015*

**math**

x^2 - 4 What are the: Intervals on which the graph is above the x axis Intervals on which the graph is below the x axis Intervals on which the function is increasing Intervals on which the function is increasing Im not sure how to write these intervals.. so then i can do the ...
*November 15, 2015*

**math**

Explain why the graphs of f(x) =x and g(x) =1/x are in the same quadrants over the same intervals. Does this relationship hold for m(x) = -x and n(x) = -1/x? Does this relationship hold for any function and its reciprocal function.
*November 13, 2015*