Saturday

May 28, 2016
Total # Posts: 759

**Calculus **

Suppose an E. coli culture is growing exponentially at 37 ◦C. After 20 minutes at that temperature, there are 1.28×10^7 E. coli cells. After 60 minutes, there are 2.4×10^7 cells. How long does it take for the culture to have double the amount of cells that it...
*October 30, 2014*

**math problem solving**

leslie has 17 tomato plants that she wants to plant in rows. she will put 2 plants in some rows and 1 plant in others. how many different ways can she plant the tomato plants?
*October 27, 2014*

**math**

Start from 110 feet away, a person on a bicycle rides towards a checkpoint and then passes it. The rider is travelling at a constant rate of 30 feet per second. The distance between the bicycle and he checkpoint is given by the equation d = |110 - 30t|. At what time is the ...
*October 23, 2014*

**Chemistry**

I was doing a lab and stared off with 10mL of HNO3 and the mass of copper which was 1.5120g. The question now is: With initial mass of copper wire being 1.5120g, calculate the volume of (16M) nitric acid that is required to fully react with the copper. Cu(s)+2HNO3(aq) --> ...
*October 14, 2014*

**model multiplication**

48 thanks just wanted to confirm my answer
*October 3, 2014*

**model multiplication**

jillian's garden, there are 3 rows of carrots, 2 rows of beans and 1 row of peas. there are 8 plants in each row. how many plants are there in all?
*October 3, 2014*

**math 4**

150-20%=?*6
*September 30, 2014*

**math 4**

please help
*September 30, 2014*

**math 4 **

yson talked with 150 customers on his shift yesterday. Of those, 20% resulted in a successful upsell of additional purchases. If Tyson makes a $6 commission on top of his regular salary for each successful upsell that he makes, how much commission did he make yesterday? $ 30...
*September 30, 2014*

**math 3**

275 so it woulbb be the 230 plus the 45
*September 30, 2014*

**math 3**

A customer sent in a $230 check to pay off an overdue bill but failed to pay the interest that accrued over the 45 days after the posted due date. The original balance owed was $230, and the account accrues interest at $0.42 per day. What amount of money should the customer ...
*September 30, 2014*

**2 math **

Denise spoke with a total of 80 customers on her shift at work today. Of those customers, 55% resulted in a sale, 15% said they would "come back another time", and 10% were sent to speak with the supervisor on shift. What is the total number of customer sales that ...
*September 30, 2014*

**2math **

n January, a company named ACME had 100 employees. In February they lost 15 employees, and in March the company hired 25 new employees. How many employees were working for ACME at the beginning of April? 100 105 110 115
*September 30, 2014*

**Math**

I forgot how to do inequalities with a rational function. The question I have is: ((3x-2)/(x-1))<1
*September 30, 2014*

**Math**

So she saw 461 dolphins that are 5 year so we don't need to estimate on this problem. So I did 461/5 is 92 is the answer. Then the said how many did he spot per summer in the 5 summers he worked so I think we need to divide the answer which is 92 and the 5. 92/5 18 is your...
*September 23, 2014*

**math**

You estimate 547= 540 and 92= 90.So now divide 540/90 and there you got your answer. 60 is your answer
*September 23, 2014*

**physics**

The speed of all electromagnetic waves in empty space is 3.00 × 108 m/s. What isthe wavelengthofradio waves emit- ted at 97.9 MHz? Answer in units of m
*September 18, 2014*

**Physics Grade 12**

Heather is sitting on her car at a spotlight. At the instant light turns green, she starts accelerating at 2.2 m/s/s. At the same moment a truck rumbles past her car going a constant speed of 12.2 m/s. Heather is infuriated at being passed by a truck and she keeps accelerating...
*September 17, 2014*

**Grade 12 Physics**

Bredan is driving through town at 25m/s and begins to accelerate at a constant rate of -1.0m/s/s. Eventually Brendan comes to a complete stop. A) Represent Brendan's accelerated motion by sketching a velocity-time graph. B) Use the velocity-time graph to determine his ...
*September 17, 2014*

**math**

Don't know
*September 10, 2014*

**science**

A vehicle starts from rest and accelerates with a constant acceleration, covering 200m in 5s. it then continues at a constant velocity for 300m before decelerating with a constant 2m/s^2 deceleration to a stop. what is the maximum speed attained, total time traveled, total ...
*September 9, 2014*

**statistics**

Assign your numbers for mean μ and standard deviation σ. Then select one number "a" bellow μ and one number "b" above μ. Choose these numbers not far from μ so we can use z. Find probability that x is between a and b: P(a < x <...
*September 4, 2014*

**chemistry**

1. What is the binding energy per nucleon? Why is the binding energy per nucleon, rather than per nuclide, used to compare nuclide stability? 2. When a nucleus forms from nucleons, is energy absorbed or released? Why? 3. Many scientists reacted skeptically to Einstein's ...
*July 26, 2014*

**Chemistry Please Help!!!**

Airbags contain a mixture of sodium azide, potassium nitrate, and silicon dioxide. A sensor detects a head on collision that cause the sodium azide to be ignited and to decompose forming sodium and nitrogen gas. This gas fills a nylon or polyamide bag such that the front face ...
*July 25, 2014*

**Science**

What are the affects when posting warning signs where there is a history of wildlife collisions. Please explain using jot dots please .
*July 17, 2014*

**Science**

I need some additional help. Can you help me?
*July 17, 2014*

**Science**

You are a scientist hired by the ministry to investigate its anti-collision strategies. Choose one of the five strategies above. Outline a procedure to test how well the strategy works. I've chosen adding highway lighting to improve night visibility. But how do I start it ...
*July 17, 2014*

**Science**

Thanks so much :)
*July 17, 2014*

**Science**

Thanks, by the way why is d a better answer ?
*July 17, 2014*

**Science**

Which of the government strategies for reducing collisions listed below might be the most effective? Explain your answer. a. Installing fencing along major highways b. Draining salty ponds near highways c. Posting warning signs d. Adding highway lighting to improve night ...
*July 17, 2014*

**Math**

Find three consecutive integers that have a sum of -402. Describe your strategy.
*July 14, 2014*

**Math**

What power of 7 is 40 353 607?
*July 14, 2014*

**algebra**

A lab assistant wants to make 5 liters of 27.2% acid solution. If solutions of 30% and 16% are in stock, how many liters of each must be mixed to prepare the solution?
*July 5, 2014*

**math**

A car costs $45000. The cost of the car depreciates by 30% each year. How muck will the car be worth in five years?
*June 23, 2014*

**science**

Why can we see ourselves in a mirror but not a wall
*June 22, 2014*

**science**

How do you calculate field of view
*June 22, 2014*

**Math**

The class with the greatest mean sales in a spring fundraiser will win a prize. The mean for Eric's class is $148. The mean for Natalia's class is $152. Natalia's sales total $150. If Natalia moves to Eric's class, the mean for each class increases. Explain why?
*June 17, 2014*

**algebra**

let the numbers be x, y, z 2x=y+z+11 2x-y-z=11 2x+3z=y+1 2x-y+3z=1 y=x+z -x+y-z=0 2x-y-z=11-------------- 1 2x-y+3z =1--------------2 -x+y-z= 0-------------- 3 consider equation 1 &2 Multiply 1 by -1 Multiply 2 by 1 we get -2x+y+z =-11 2x-y+3z =1 Add the two 4z=-10...
*June 17, 2014*

**English**

aside from any grammar or spelling mistakes how is this essay! Can the perfect ideal of loyalty ever be achieved? With no guidelines how can you match a book definition of loyalty. Loyalty is essential in human life, but what is it. The dictionary will describe loyalty as ...
*June 17, 2014*

**SP180.1.2 Principles of Public Speaking**

SP180.1.2 Principles of Public Speaking i need help with my outline. not sure where to go from here. I. TITLE: Bullying in schools A. General Purpose: To persuade B. Specific Purpose: To persuade my audience that bullying in schools need to be stopped C. Central idea: The ...
*June 12, 2014*

**Math**

A circular swimming pool has a diameter of 7.4m, and a height of 2.4m. What is the volume of the pool?
*June 12, 2014*

**Math**

will it be 824.25
*June 12, 2014*

**Math**

I went on that website but I don't understand it
*June 12, 2014*

**Math**

How do you calculate the surface area of a cylinder when the diameter is 15cm and the height it 10cm
*June 12, 2014*

**Math**

b) The median of 15,17,13,19,20,33,22,18 and __ is 18.5 . Is it possible the determine the missing value?
*June 11, 2014*

**Chemistry**

thanks
*June 7, 2014*

**Chemistry**

how would you do this question when i did it i did -log(1.0) but that is just 0 so what it the procedure to do this question Calculate the pH of a 1.0 mol/L aqueous solution of sodium benzoate. Note: Only the benzoate ion affects the pH of the solution.
*June 7, 2014*

**Lone Peak High**

How much of a stock (18.5 M) HCl solution would be required to make 100mL of 0.025 M HCl?
*June 7, 2014*

**Science**

That's what I'm thinking..
*June 6, 2014*

**Science**

So 35 x 9.8 = 343 N 343 x 3.0 = 1029 J Is that the answer to A or B, I'm a bit confused
*June 6, 2014*

**Science**

a)How much work is required to lift a 35-kg object from the ground 3.0 m into the air? b) How much gravitational potential energy did this object gain?
*June 6, 2014*

**Science**

Calculate the work done in each of the following situations. a) A horse pulls a wagon with a force of 1200 N and moves it 15 m. b) A cable lifts an elevator 16 m by using a cable with a tension force of 2500 N.
*June 5, 2014*

**science**

When you do work to lift an object, what form of energy does the object gain
*June 5, 2014*

**Science**

An object has a mass of 5.0 kg on the surface of the Moon. What would be the object's: a) mass on Earth b) force of gravity on Earth
*May 28, 2014*

**Health**

help**
*May 25, 2014*

**Health**

What is Marijuana ? Can you get cancer from Marijuana ? Is it good or bad for you? I need h
*May 25, 2014*

**Language **

I need help answering this question.. How did you or your family deal or cope with these issues? These are the social justice issues i came up with : Poverty, Alcohol & drinking, violence, racism, and lack of human rights.. I know it's my own opinion but I don't know ...
*May 25, 2014*

**Math**

A) temperature readings taken over five years
*May 23, 2014*

**Math**

State the types of graphs that you could use to present each set of data below.Which type of graph do you think is most appropriate? Data
*May 23, 2014*

**History**

Ontario,Quebec,Nova Scotia and New Brunswick
*May 21, 2014*

**History **

Explain why some british politicians thought it would be good for Great Britain to keep the colonies?
*May 21, 2014*

**History**

in which ways did the colonies of British north america benefit from the intercolonial railways
*May 21, 2014*

**English**

No just an essay not a life story
*May 20, 2014*

**English**

What's a good title for a mother Teresa essay?
*May 20, 2014*

**Science**

The meter per second squared is the unit of Acceleration. My answer is a, acceleration.
*May 20, 2014*

**English**

Thank you.
*May 19, 2014*

**English**

What does this sentence mean? It was a rainy season which caused the river to be swollen.
*May 19, 2014*

**Math**

Jane has a set of green, black and yellow pens. The green pens make up 1/3 of the set, the set has 5 black pens, the yellow pens is twice the number of black pens. How many pens are in Jane set?
*May 18, 2014*

**Science**

i dont understand
*May 14, 2014*

**chemistry**

if 21.54 grams of caco3 is added to an ecxess of HCl in the equation Cacl3+2Hcl produces Cacl3+co2+H20, what mass does co2 produce?
*May 13, 2014*

**math**

The deck of a swimming pool had the same width all the way around. The perimeter of the pool is 50m. The outside perimeter of the deck is 74m. What is the width of the deck?
*May 12, 2014*

**math**

How do I find the number of millimeters long a beak is?
*April 28, 2014*

**physics grade 10 icse**

two balls of masses in ratio 1:2 are dropped from the same height find : a. the ratio between their velocities when they strike the ground and b. the ratio of the forces acting on them during motion
*April 13, 2014*

**Math**

Mr. Garcia bought 8 cars at 52 each for a total of 416. He bought 11 planes (3 more planes than cars) at 38 each (52-14) for a total of 418. Add 416 to 418 and there is 834 total.
*March 27, 2014*

**Art - Help ASAP!!**

i checked the website but its not there
*March 21, 2014*

**Art - Help ASAP!!**

how many years does it take to finish the course sculpture at OCAD university??
*March 21, 2014*

**Need Math Help Please **

in probability why are tree diagrams more useful than to use tables ?? please explain to me in a paragraph so i understand completely and could you please show me an example where i would have to use the tree diagram, and why i couldnt use a table???
*March 20, 2014*

**Need math help please **

could someone please give me an example not an example using coins, marbles, spinner, like something different that would explain the difference b/w theoretical and experimental probability.
*March 20, 2014*

**Math Help**

could someone please give me an example not an example using coins, marbles, spinner, like something different that would explain the difference b/w theoretical and experimental probability. And please explain.
*March 20, 2014*

**Math Help **

in probability why are tree diagrams more useful than to use tables ?? please explain to me in a paragraph so i understand completely and could you please show me an example where i would have to use the tree diagram, and why i couldnt use a table???
*March 20, 2014*

**Math help understand **

Have world problem and I don't get it please explain step by step simplify and show me as many ways as possible cause one might be easier than other !! A bicycle travels at constant speed of 15km/hr. Bus starts 195km behind bicycle and catches up to bicycle in 3 hrs. What...
*March 20, 2014*

**science pls help**

True or False 1. If a 40 kg person is accelerating at 10 m/s2, then the magnitude of the force acting on him or her is 400 N. (1 point) true false Multiple Choice 2. How much force is needed to make a 60 kg object accelerate at a rate of 2.0 m/s2? (1 point) 62 N 62 kg 120 N ...
*March 13, 2014*

**CHEMISTRY**

When 6.724 g of one of the hydrates of sodium sulfate (Na2SO4) was heated to drive off its water of hydration, the residue of anhydrous sodium sulfate has a mass of 2.964 g. What is the value of x in the formula for the hydrate, Na2SO4•xH2O?
*March 7, 2014*

**CHEMISTRY**

Thank you so much!
*March 7, 2014*

**CHEMISTRY**

A lawn fertilizer is rated as 6.50% nitrogen, meaning 6.50 g of N in 100 g of fertilizer. The nitrogen is present in the form of urea, (NH2)2CO. How many grams of urea are present in 100 g of the fertilizer to supply the rated amount of nitrogen?
*March 7, 2014*

**Calculus**

I need help finding the derivative of √3x/(x^2-4) at x=3
*February 17, 2014*

**Statistics in Psychology**

A researcher finds that the correlation between variable A and variable B is r= 5 1.20. She also finds that the correlation between variable C and variable B is r= 5 2.40. Which relationship is scientifically more useful and by how much?
*February 10, 2014*

**Statistics in Psychology**

What research steps must you go through to use the relationship between a person’s intelligence and grade average in high school so that, if you know a person’s IQ, you can more accurately predict the person’s grade average?
*February 10, 2014*

**INF 103**

Digital literacy is a skill that is important for: utilizing computers effectively. counting numbers reading digits. hacking computer information.
*February 9, 2014*

**Connexus, Civics, History**

Oh so you used to be a teacher?
*February 7, 2014*

**Connexus, Civics, History**

Isnt that what this websites for?
*February 7, 2014*

**Connexus, Civics, History**

Please some answer them for me T_T
*February 7, 2014*

**Connexus, Civics, History**

Help with civics "What are the Rights of the Accused"? 1. The Supreme Court ruled in re Gault that people... A. that are under arrest must be read their rights by law enforcement. B. who cannot afford an attorney must be provided one by the state. C. accused of ...
*February 7, 2014*

**Statistics in Psychology**

Please help. Thank you in advance for your time. In an English class last semester, Foofy earned a 76 (x¯= 85, Sx= 10). Her friend, Bubbles, in a different class, earned a 60 (x¯= 50, Sx = 4). Should Foofy be bragging about how much better she did? Why?
*February 3, 2014*

**Statistics in Psychology**

Please help with this question, THANK YOU in advance. A line should be over the top of both X’s. In an English class last semester, Foofy earned a 76 (X = 85, Sx = 10). Her friend, Bubbles, in a different class, earned a 60 (X=50, Sx = 4). Should Foofy be bragging about ...
*February 3, 2014*

**Statistics in Psychology**

Please help me with both of these questions. THANK YOU in advance for your for you help. 13. For the data, 9 5 10 7 9 10 11 8 12 7 6 9 (a) Compute the z-score for the raw score of 10. (b) Compute the z-score for the raw score of 6. 14. For the data in question 13, find find ...
*February 3, 2014*

**Chemistry**

Write a balanced equation to describe the following reactions: a) C14H30 is cracked to produce ethene, hydrogen and one other compound b) C16H34 is cracked to produce ethene and propene in a 2:1 ratio and only one other compound Thanks:)
*February 1, 2014*

**How to do this problem fast**

8%. Because -> percentage change = new-old/old x 100 so 0.68/8.50 x100 Hope this helps :)
*February 1, 2014*

**math**

If the rectangles width is trippled and its length is doubled the perimeter of the new rectangle is 92 centimeter greater than the original perimeter what is the area of the original rectangle?
*January 30, 2014*

**math**

If the rectangles width is trippled and its length is doubled the perimeter of the new rectangle is 92 centimeter greater than the original perimeter what is the area of the original rectangle?
*January 30, 2014*