Saturday
April 18, 2015

Posts by Lena

Total # Posts: 1,012

Elliot put 7 cups of tea into the pitcher shown. How many more cups of tea does he need to fill the pitcher? (1 quart = 4 cups)
March 26, 2015

physical
1.What kind of information is indicated by the graph of the acceleration due to gravity versus ball¡¯s mass if the slope of the curve is zero?
March 16, 2015

Math
Beginning at age 35, Ms. Trinh invests \$4000 each year into an IRA account until she retires. When she retires she plans to withdraw equal amounts each year that will deplete the account when she is 80. Find the annual amounts she will receive for each of the following ...
March 13, 2015

Physic
The concepts in this problem are similar to those in Multiple-Concept Example 4, except that the force doing the work in this problem is the tension in the cable. A rescue helicopter lifts a 75.4-kg person straight up by means of a cable. The person has an upward acceleration ...
March 5, 2015

Physic
A 16-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 27 N. Starting from rest, the sled attains a speed of 2.2 m/s in 9.6 m. Find the coefficient of kinetic friction between the runners of the sled and the snow.
March 5, 2015

Physic
A 287-kg crate is being pushed across a horizontal floor by a force P that makes an angle of 25.6 ° below the horizontal. The coefficient of kinetic friction is 0.236. What should be the magnitude of P, so that the net work done by it and the kinetic frictional force is zero?
March 5, 2015

Physic
A person pulls a toboggan for a distance of 43.1 m along the snow with a rope directed 33.3 ° above the snow. The tension in the rope is 109 N. (a) How much work is done on the toboggan by the tension force? (b) How much work is done if the same tension is directed ...
March 5, 2015

Physic
A person pushes a 13.7-kg shopping cart at a constant velocity for a distance of 16.3 m on a flat horizontal surface. She pushes in a direction 22.2 ° below the horizontal. A 48.7-N frictional force opposes the motion of the cart. (a) What is the magnitude of the force ...
March 5, 2015

Physic
You are moving into an apartment and take the elevator to the 6th floor. Suppose your weight is 640 N and that of your belongings is 940 N. (a) Determine the work done by the elevator in lifting you and your belongings up to the 6th floor (15.2 m) at a constant velocity. (b) ...
March 5, 2015

Chemistry
In an experiment, you dissolve 0.30 g of KHP (MM = 204.22 g/mol) in 20 mL of DI water and titrate the sample with 0.10 M NaOH. Calculate the volume (to the nearest mL) of NaOH required to reach the equivalence point. IS it a) 3 b)15 c)20 d)30 e)100 I have done MV=MV (0.3/204....
January 8, 2015

MATH
15 FULL CUPS AND 22 HALF CUPS
September 30, 2014

MATH
SASHA AND FRANCISCO WERE SELLING LEMONADE FOR \$.25 PER HALF CUP AND \$.50 PER FULL CUP. AT THE END OF THE DAY THEY HAD COLLECTED \$15 AND HAD USED 37 CUPS. HOW MANY FULL CUPS AND HOW MANY HALF CUPS DID THEY SELL?
September 30, 2014

ECE 201
Why is it important for teachers to understand students’ culture and backgrounds in an effort to address challenging behavior?
September 25, 2014

statistics
Histograph or Bar Graph
September 23, 2014

physics
if the diamter of a human hair is (50*10^-6 m) estimate the volume of hair on your head
September 13, 2014

english
what genre is Black Ships Before Troy ~ by Rosemary Sutcliff?
September 1, 2014

Physics
A 4.5kg box slides down a 4.1-m -high frictionless hill, starting from rest, across a 1.7-m -wide horizontal surface, then hits a horizontal spring with spring constant 490N/m . The other end of the spring is anchored against a wall. The ground under the spring is frictionless...
June 8, 2014

Physics
A horizontal spring with spring constant 110N/m is compressed 16cm and used to launch a 2.8kg box across a frictionless, horizontal surface. After the box travels some distance, the surface becomes rough. The coefficient of kinetic friction of the box on the surface is 0.15. ...
June 8, 2014

Workplace Skills
I don't know if AJ's termination would show up on a background check, and I was not able to find anything online.
May 25, 2014

Workplace Skills
We're supposed to read over the following scenario and provide advice for AJ: AJ has a job that he really likes and pays well, but he is worried he is about to be terminated. He doesn't want to quit his job and give up his excellent pay, but he knows that being fired ...
May 25, 2014

Physics
(637) A cyclist is riding on a horizontal frozen meadow. He is turning so that he is tilted at an angle of 60°. Radius of curvature of the bend is 100m. What is the maximum speed of the cyclist? Thank you for your time!
May 25, 2014

Physics
(595)Vinyl record spinning at 45rpm. What is the frequency of rotation (in Hz)? What is the orbital time of the vinyl record (in seconds)?
May 25, 2014

social studies
What do people in Catalonia celebrate every April 23rd?
April 23, 2014

social studies
What major land form and body of water cover much of northern south america?
April 23, 2014

Physics
The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a potential difference of about 0.070 V exists across the membrane. The thickness of the membrane is 0.000000008 m. What is the magnitude of the ...
April 19, 2014

world history
How has the global economy changed after the Cold War?
April 19, 2014

world history
Ghana but but the movement there was relatively peaceful. Or Algeria
April 16, 2014

world history
Which African independence movement is most similar to the movement in Kenya? I'm thinking the one in Haiti but I'm not sure
April 16, 2014

Chemistry
what is the pH and pOH of a solution made by adding water to 15 grams of HCl until the volume of the solution is 2500mL?
April 5, 2014

Chemistry
ohh okay now i understand. thank you
March 4, 2014

Chemistry
so v would be 83mL?
March 4, 2014

Chemistry
what volume of concentrated 18M H2SO4 is required to prepare 250mL of a 6.0M solution? how would you solve this problem? i know it has something to do with the molarity formula but no idea how to apply it
March 4, 2014

Chemistry Help
1.) Calculate the number of atoms in 2.58 mol antimony. 2.) Determine the mass of 1.45 mol FePO4. 3.) Calculate the number of mol in 6.75 g of NaCl. 4.) What is the volume, in liters, of 2.54 mol methane (CH4) gas?. 5.) What is the percent composition of B4H10?
February 10, 2014

health
I don't know if you can access this (not sure if this information is free) but there is a review on the negative and positive health effects on alcohol consumption. Since I cannot post the link, here is the reference: Grønbæk, M. (2009). The positive and ...
January 20, 2014

physics
a 1.2 kg cart slides eastward down a frictionless ramp from a height of 1.8 m and then onto a horizontal surface where it has a head-on elastic collision with a stationary 2.0 kg cart cushioned by an ideal Hooke's law spring. the maximum compression of the spring during ...
November 18, 2013

Physics
In a demonstration in physics class, a 1.2 kg dynamics cart starts from rest at the top of a ramp. the ramp is 2.4 m above the ground. the cart then rolls down to the bottom of the ramp, where it collides with a stationary 1.4 kg dynamics cart. Assume that an elastic head-on ...
November 18, 2013

Physics
November 18, 2013

ap world history
which region of the world benefited more from the columbian exchange?
September 22, 2013

ap world history
how did wheat impact the Americas?
September 22, 2013

Cells and Herdity
September 16, 2013

ap world history
where did wine originate?
September 2, 2013

world history
How did it spread in the periods from 870 B.C.E to about the 18th century, mostly in Greece and Rome
August 30, 2013

world history
to what places did wine spread?
August 30, 2013

world history
1. How does the story of Coca-Cola relate to the rise of capitalism and entrepreneurship in the 19th and early 20th c? 2. what is the "iron curtain"?
August 29, 2013

math
John's age = Sally's age - 3 years Elissa's age = 13 years Sally's age = Elissa's age - 3 years = 13 -3 = 10 years Now that we know Sally's current age, we can figure out John's age. John's age = 10-3 = 7 years So if John is 7 years as of now, ...
April 5, 2013

math
7.49+2.05/0.50-0.59 FOLLOW BEDMAS 1) First do the division in the question 7.49+4.1-0.59 2) Now add and subtract = 11
April 3, 2013

Math
So this question is wanting you to identify some sort of pattern. Let's write it out as the following (makes it easier to visualize): 2,8,32,?,?,? Now, I can see a pattern right away. 2 x 4 = 8 8 x 4 = 32 32 x 4 = 128 (month 4) 128 x 4 = ? (month 5) and so on and so forth...
April 3, 2013

math
Let's say X represents a full can of paint If X represents a full can on paint, then: - 1/8 of X was used in the morning - 5/8 of (7/8 of X) was used in the afternoon So you would add the two values together to get a sum 1/8X + 5/8(7/8X) = 1/8X +35/64X =43/64X Therefore 43...
April 2, 2013

math
x-y=0 x+y = 4 x+y+x-y=4+0 2x=4 x=2 Therefore y=2 x=2 y=2
April 2, 2013

math
So the formula for the area of this photograph would be the following: area = length x width (let's fill in what we know from the question into this formula) 28 =(2w-1) * w (Now let's use the distribution rule and multiply everything in the brackets by 'w') 28...
April 2, 2013

Math
Let us call the jar of peanut butter "P" Let us call the loaf of bread "L" Now let us make some mathematical sentences from the information provided to us from the question above. 1P + 3L = \$6.70 3P + 1L = \$9.32 As you can see, we have 2 unknowns. We want ...
March 23, 2013

Maths
1.5 x 10^8 150 000 000 You start with the 0 on the far right (as that is where the decimal place is) and you see how many times you must shift it over (in this case 8) before the number is greater than or equal to 1 but less than 10.
March 23, 2013

CHEM HELP!!!
The solubility of AgCl(s) in water at 25 C is 1.33x10^-5 M and its deltaH of solution is 65.7 kJ/mol . What is its solubility at 60.1 C ? Please explain how to solve for this!!
March 22, 2013

Math
Dr. Jane, couldn't the number 36 also be a possibility as it is greater than 30 but less than 50 and has a 6?
March 12, 2013

Math
I don't know how you actually found a value :/
March 12, 2013

Math
Perimeter = S1 + S2 + S3 5x^4-2x^3+x-3= (2x^4 + 2x-1) + (2x^4+2x-1) + base 5x^4-2x^3+x-3 = 2(2x^4 + 2x-1)+ base 5x^4-2x^3+x-3 - 2(2x^4 + 2x-1) = BASE 5x^4-2x^3+x-3 -4x^4-4x+2= BASE 5x^4-4x^4-2x^3-3x-1 = BASE
March 12, 2013

math
50 people require 4 cups of sugar 1 person will require 4/50 cups of sugar 100 people will require 4/50 x 300 cups of sugar = 24 cups of sugar 6 cups of sugar = 1 bag 1 cup of sugar = 1/6 bag 24 cups of sugar = 1/6 x 24 bag = 4 bags Therefore, 300 people require 4 bags of sugar
March 12, 2013

math
In order to paint 144 sq feet it will take 45 minutes In order to paint 1 sq foot it will take 45/144 minutes In order to paint 240 sq feet it will take: 45/144 x 240 minutes = 75 minutes
March 12, 2013

math
x^2-4x+32=0 a =1 b= -4 c= 32 4 +or- sq root (-4)^2 -4(1)(32) 4 +or- sq root 16-128 4 +or- sq root -112 you can't take the sq root of a (-) number so you can't solve this :/ How did you get 2 +or- 2 sqrt7. Perhaps I went wrong somewhere.
March 12, 2013

Algebra
What exactly is a trend line? I'm thinking it would be B because they're not asking for the exact line. In fact, if it's a scatter plot there wouldn't be a perfect straight line. I think you're right. It's probably B.
March 12, 2013

Algebra
When x is 1, y is 1.5 When x is 2, y is 2.6 When x is 3, y is 2.2 When x is 4, y is 3 When x is 5, y is 2.9 When x is 6, y is 4.6 When x is 7, y is 4.2 When x is 8, y is 5 The numbers aren't adding up :/ Is what I stated above, correct? A is clearly wrong: ex. y=-2x +1 1.5...
March 12, 2013

Algebra
Yes, I was also thinking that it seemed too easy.
March 12, 2013

Algebra
Total # of students = 57 Band students = 25 Band or Choir or Both students = 48 Choir and Math students = 9 So from what you stated in about the Venn diagram, it shows that only 7 students take exactly 2 courses from Mr. Green (Math and Band). So wouldn't it simply be 7 ...
March 12, 2013

maths
2 right angled triangles = 1 equilateral triangle. You can pretty much split it down the middle and you'll see the 2 triangles from. The formula for a right angle triangle is: (b x h)/2 = area If we were solving for 1/2 the triangle we know that the base is 5 cm, the ...
March 12, 2013

math
(3 +or- sq.root 361)/2 (3 +or- 19)/2 From here you get the 2 following equations: (3+19)/2 = 11 (3-19)/2 = -8
March 12, 2013

Lang Arts! HELP!
No problem :D
March 12, 2013

Lang Arts! HELP!
This is what I think: She clearly has a very motherly character about her as she is a mother. You can see that the children are frightened but she tells them that everything will be OK. I get the sense that she is also frightened by the events that are occurring but she is the...
March 12, 2013

math
What is the question?
March 12, 2013

MATHS..
Hi. I tried answering this in a previous post. I'm not entirely sure if I did this correctly but here was my best shot at it: So 3 digit integers would be from 100 to 999. Let's break it up: 1) 100-109 you know that there are 5 #s are odd (101,103,105,107,109) and of ...
March 12, 2013

biology
You should Google this question. There are many difference as bobpursley has already alluded to.
March 12, 2013

math
Total # of students = 200 Biology students = 36 Spanish students = 52 Other students = 126 36+52+126 does not even = 200 students total Did you type this question incorrectly?
March 12, 2013

MAths algebra
1) Day 1: Jog = 3/2 miles Walk = 7/4 miles Rest = 5/2 minutes Walk = 1 mile Day 2: (increase distances + time by 1/3 of that day) Jog = 1 1/3 x 3/2 = 4/3 x 3/2 = 12/6 = 2 miles Walk = 4/3 x 7/4 = 28/12 = 7/3 miles Rest = 4/3 x 5/2 = 10/3 minutes Walk = 4/3 x 1 = 4/3 miles or 1...
March 12, 2013

math
So 3 digit integers would be from 100 to 999. Let's break it up: 1) 100-109 you know that there are 5 #s are odd (101,103,105,107,109) and of those #s 101 is not distinct therefore their are only 4 distinct odd #s 2) 110-119 you know that none of the #s are distinct (all ...
March 12, 2013

algebra!
There is probably an easier way to go about doing this but I can't seem to think of it at the moment so you'll have to suffice with this until someone else can answer: I came up with this formula: a x b + 7 = 2027 where a is the the divisor and b is the quotient and 7 ...
March 11, 2013

simple geometry
March 11, 2013

geometry!
Assuming the swimming pole is a rectangular prism wouldn't you simply do the following: V = length x width x depth V = 20 x 8 x 3 V = 480 m^3 of water
March 11, 2013

algebra!!!
I'm not Ms. Sue but I could try to help. Let's create a formula: Let A denote the # of adult tickets Let C denote the # of child tickets Therefore... \$13 x A + \$11 x C = \$179 13A + 11C = 179 So from this point forward, I would ask the following. What # must you ...
March 11, 2013

geometry
OK. So there are 33 multiples of 3 that are < or = 100. 3,6,9,12,15,18,21,24,27,30,33, 36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96,99 ect. There are 20 multiples of 5 that are < or = 100. 5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100 The ...
March 11, 2013

geometry
Sure; post it and I'll give it a go.
March 11, 2013

geometry
What exactly is the question asking? It would make sense if they were asking the greatest distance between 2 points but asking what shortest distance between 2 points does not make sense. Perhaps I'm not understanding the question properly. If you could expand on what the ...
March 11, 2013

geometry
Is there a figure that you were given? This question does not make much sense to me.
March 11, 2013

Geometry
If you can imagine it, the figure will look like a right angle triangle. The hypotenuse will the 20 feet. The base will be 7 feet. The height is the unknown. a^2 + b^2 = c^2 7^2 + b^2 = 20^2 Solve for 'b' and you will get the height of the wall where the ladder reaches.
March 11, 2013

Geometry
March 11, 2013

Fluid Imbalances
The only thing I could really conclude was that perhaps if there is an increase in H+ in the blood then then in order to compensate, K+ might move out of the cells and into the plasma in order to compensate and the H+ would move into the cells? Also acidosis may result in ...
March 3, 2013

Fluid Imbalances
Why would a person who's blood gasses indicate metabolic acidosis be at risk for hyperkalemia?
March 3, 2013

english
I would say that summaries save time. They allow the reader to get a gist of what the paper is about without reading the whole thing. They usually outline key themes and characters. Summaries are usually designed to help the reader quickly understand the purpose of the paper/...
March 2, 2013

Health
I quite certain it is option D. The Affordable Care Act allows some preventative services under an insurance plan/policy and one of those services is diet counselling for people at high risk for chronic diseases.
March 2, 2013

math
Sub in 44 for n. 75-44+6
February 25, 2013

math
Did you write out the full question? It seems incomplete.
February 25, 2013

Math Perimeter
Not entirely sure what this question is asking but if it's asking you to draw any shape with a perimeter of 22 units then essentially you just need to make sure that all the sides of your shape add up to 22. For example. Suppose you wanted to make a rectangle. You could ...
February 25, 2013

math
Yes. You did this correctly. 2 4/5 as an improper fraction is 14/5.
February 25, 2013

math
Well let's figure out how many square metres the yard is in order to figure out how many cups of grass seed he will need. A = L x W A = 6 x 7 A = 42 squares metres So the question tells us for every 1 square metre, Elbert uses 1 cup of grass seed. If he has 42 squared ...
February 25, 2013

Math (Simplifying Expressions)
Let's use BEDMAS (brackets, exponents, division, multiplication, addition, subtraction) 48 ÷ 4 x 5 - 2 x 5 (Since there are no brackets or exponents, let's divide) = 12 x 5 - 2 x 5 (Since there is no more division, let's multiply) = 60-10 (Last thing left to...
February 25, 2013

Algebra
Now you've got me stumped. I don't understand why it would be option B :/
February 25, 2013

Algebra
So the area of a triangle is the following: A =( B x H) / 2 Let's plug in what we've been told in the question 24 = (3B x B) / 2 48 = 3B x B 48 = 3B^2 16 = B^2 + or - 4 = B I would go with option C because if you plug in 4 in or -4 for B into the area of a triangle ...
February 25, 2013

Algebra
You've got me stumped on this one too. I hope you understand why it's option B because I have no idea.
February 25, 2013

Algebra
I would also go with C because: (-12x)(-12x) = 144x^2 (12x)(12x) = 144x^2
February 25, 2013

math
Chance of not getting heads: 1) Toss # 1: 1/2 2) Toss # 2: 1/2 3) Toss # 3: 1/2 1/2 * 1/2 * 1/2 = 1/8 So I think the probability would be 1/8.
February 25, 2013

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