# Posts by lena

Total # Posts: 1,041

**Math**

Compare partial products and regrouping. Describe how the methods are alike and different. ♡♡♡♡?????????

*October 27, 2016*

**Math**

Kurt cut pizzas into wedges measuring 40 degrees. If each person eats one piece of pizza, how many people could he feed with two whole pizzas?

*June 6, 2016*

**Math (Rounding #s)**

How would I round 0.598958333 to the thousandths? Would it be 0.6000 or 0.5990? Also, could you please tell me why the answer is what it is? If I had something like, 0.55998, as in two 9s in the row, what would I do then? Thank you!

*April 4, 2016*

**home economics**

what are the characteristics of dirt?

*February 15, 2016*

**math**

I forgot to check it. But the answer is 26.Also I am in third grade!!!!

*February 10, 2016*

**math**

2x9=18 and 2x4=36.18+36=54.

*February 10, 2016*

**math**

I still don't get it.

*February 10, 2016*

**math**

What is the perimeter of 4 feet wide and 9 feet long?????

*February 10, 2016*

**math**

Scientists are conducting an experiment with a gas in a sealed container. The mass of the gas is measured, and the scientists realize that the gas is leaking over time in a linear way. Six minutes since the experiment started, the gas had a mass of 144 grams. Fourteen minutes ...

*February 3, 2016*

**Math**

I think it's C.

*January 21, 2016*

**Language Arts Checking answer**

I think it's C.

*January 21, 2016*

**science**

How do animals find their shelter?

*January 21, 2016*

**Math**

Using the distance function s(t) = t2 + 4t + 30, "s" is in feet and "t" is in seconds, find the velocity function, v(t), and acceleration function, a(t).

*December 19, 2015*

**Math**

6!Thank you!!!!

*November 17, 2015*

**Math**

If you mind I have another problem....I am a product.One of my factors is 3.The other factor is 2 times as great.What number am I???

*November 17, 2015*

**Math**

I am a product.One of my factors is 7.The sum of my factors equals 11.What number am I?

*November 17, 2015*

**Math**

I am a number that is four times the product of 2 and 3.One of my factors is 4.What is my other factor?

*November 17, 2015*

**Math Homework**

Directions: Find the fourth-order derivative. 1.) f''(x)=7x^5/2, f(^iv)(x) 2.) f''(x)=8x^7/5, f(^iv)(x)

*October 31, 2015*

**Chemistry**

Why does the temperature in exothermic reactions increase, reach a maximum, and then decrease?

*October 19, 2015*

**Math Decimals**

The answer is 86.23

*October 12, 2015*

**Math (ASAP)**

I really need help with this. Thank you! Directions: Using the limit process, find the limit of the following function below. f(x) = 2 – x^2

*October 8, 2015*

**Math Help**

Directions: Using the limit process, find the limit of the following function below. f(x) = 2 – x^2

*October 8, 2015*

**Math Help**

Directions: Using the limit process, find the limit of the following function below. f(x) = 2 – x^2

*October 8, 2015*

**Madison**

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*

**Physics**

31.5

*December 4, 2014*

**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*

**math 8th**

Now y y'all gonna sit there and do that @jo dirt is correct like y'all weird to say he was wrong cause I just took the test and he is completely right

*March 20, 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*

**proportional relationship**

Nxnsbsb

*February 4, 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**

please help Ms. SUE!!!!

*November 18, 2013*

**ap world history**

so Asia?

*September 22, 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*

**7th Grade**

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*

**Science**

polar

*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*