# Posts by Emily

Total # Posts: 2,967

**Math word problem**

jack was 21 years older than kat. Together their ages totaled 161 years. What were their ages?

*November 1, 2011*

**Physics**

A 0.5 kg wooden block is placed on top of a 1.0 kg wooden block. The coefficient of static friction between the two blocks is 0.35. The coefficient of kinetic friction between the lower block and the level table is 0.2. What is the maximum horizontal force that can be applied ...

*October 30, 2011*

**calculus**

f(x)=cos(1/x) Find a sequence for x-values that approach 0 such that cos(1/x)=0.

*October 29, 2011*

**chemistry**

If you have a solution that is 1.7 M sodium chloride and you have 1 L of that solution, how many moles of sodium chloride do you have?

*October 28, 2011*

**Math**

Maria has $5.05 in quarters and dimes. The number of quarters exceeds twice the number of dimes by 1. Find the number she has of each kind.

*October 28, 2011*

**Chemistry**

Calculate the mass of solid neded to make 500ml of solution that is 0.25m in sulfate ion, using sodium sulfate decahydrate.

*October 28, 2011*

**algebra**

thanx :)

*October 27, 2011*

**algebra**

i REALLY need some help with this. i HATE math! :(

*October 27, 2011*

**algebra**

1. - 5(2x+2)is greater than or equal to -10x - 17 (1 point) a)x is greater than or equal to 7 b)x is less than or equal to 19 c)all real numbers d)no solution

*October 27, 2011*

**SOCIAL STUDIES**

I need help with this answer so I don't know

*October 26, 2011*

**LA/Lit.**

Word withing the word analogies. primate is to primeval as coelenterate is to medieval deliberate is to archival ingrate is to credible migrate is to primal

*October 25, 2011*

**geometry**

given line segment PQ , PQ=3QR, and QR= 1/3 RS Prove: line segment PQ is congruent to line segment RS

*October 24, 2011*

**statistics**

IQ scores are normally distributed and assume that the average IQ for all Economics majors is 108 with a standard deviation of 11. What percentage of Economics majors would have an IQ of more than 118?

*October 24, 2011*

**statistics**

Suppose the amount of time it takes for statistics students to complete their midterm is normally distributed with a mean of 85.70 minutes and a standard deviation of 22.55 minutes. If 10 students are randomly selected, what is the probability that they would average less than...

*October 24, 2011*

**geometry**

triangle ABC is an isosceles right triangle. The endpoints of the hypotenuse of ABC are A(4,7)B(8,1). Find the possible coordinates for the vertex C

*October 23, 2011*

**Alegra 2**

A baseball is hit at a point of 3 feet above ground at a velocity of 100 feet per second and an angle of 45 degrees. The path of the baseball is h(x)= -0.0032(x-156.25)squared+87, where x and h(x) are measured in feet. A. what is the baseball's maximium height? B. will the...

*October 23, 2011*

**Chem**

A radiation lab orders 64uCi of P-32. After 42 days the activity of the sample is 8.0uCi. What is the life of P-32? Thanks

*October 19, 2011*

**chemistry**

I got yeah! 40---> 20----> 10 5,730---> = 11,460 years

*October 19, 2011*

**vocab**

1) gaunt 2) blatant 3) garble 4) gloat 5) contrive 6) immaculate 7) plagiarism 8) qualm 9) retaliate 10) blight

*October 19, 2011*

**Algebra 1**

(-10/10) - (-18/9)

*October 18, 2011*

**social studies**

Lack of food, didn't know how to provide for themselves in the new world

*October 18, 2011*

**math**

3a to the third plus 12a squared minus 63a

*October 17, 2011*

**science**

The specific heat of silver is 0.057 calories/gram°C. If 10.0 grams of silver were heated and the temperature of the sample changed by 20.0°C, how many calories of heat energy were absorbed by the sample? (A)3,508 calories (B)0.029 calories (C)11.4 calories (D)0.114 ...

*October 17, 2011*

**chem**

How many grams of H20 are produced when 140 grams of NH3 reacts by the following? Answer in 3 SF 4NH3+6NO--->5N2+6H20 Please help! Thanks

*October 14, 2011*

**Chemistry**

How many moles of CaCl2 are in 250mL of a 3.0M of CaCl2? Ca=40.08 -- Cl=35.45 X 2 ?? Thanks

*October 14, 2011*

**pre algebra**

how do you simplyfy -9+-9+-9+-9

*October 13, 2011*

**pre algebra**

how do i figure out how to write a number setence for the product on the number line -10 -8 -6 -4 -2 0 2

*October 13, 2011*

**Physics**

A 0.30 kg stone attached to a 0.8 m long string is rotated in a horizontal plane. The string makes an angle of 15° with the horizontal. Determine the speed of the stone.

*October 12, 2011*

**physics**

An object is dropped from a cliff and reaches a velocity of 47.5 m/s at the time of impact. a) How high is the cliff? b)How long did it take to hit the river below?

*October 11, 2011*

**physics**

a 75 kg person escapes from a burning building by jumping from a window 30 m above a catching net. Acceleration due to gravity is 9.81 m/s^2. Assuming air resistance is simply a constant 96 N force on the person during the fall, determine the person's velocity just before ...

*October 11, 2011*

**math**

6.2 hours...?

*October 11, 2011*

**physics**

A skier is accelerating down a 30.0° hill at a = 3.70 m/s2 ( (a) What is the vertical component of her acceleration? |m/s2 (downward) (b) How long will it take her to reach the bottom of the hill, assuming she starts from rest and accelerates uniformly, if the elevation ...

*October 11, 2011*

**physics**

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 13 m/s. The cliff is h = 58 m above the water's surface, as shown below. (a) How long does it take for the stone to fall to the water? s (b) With what speed does it strike the...

*October 11, 2011*

**Physics**

A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials' boat pulls up next to the spy's boat, both reach the edge of a 7.5 m waterfall. If the spy's speed is 19 m/s and the officials' speed is 24 m/s...

*October 11, 2011*

**math**

5464

*October 11, 2011*

**Statistics**

Each year, thousands of college seniors take the Graduate Record Examination (GRE). Assume the scores are transformed so they have a mean of 600 and a standard deviation of 150. Furthermore, the scores are known to be normally distributed. Determine the percentage of students ...

*October 8, 2011*

**Physics**

Estimate the force a person must exert on a string attached to a 0.160 kg ball to make the ball revolve in a circle when the length of the string is 0.600 m. The ball makes 1.80 revolutions per second. Do not ignore the weight of the ball. In particular, find the magnitude of ...

*October 6, 2011*

**physics**

During a basketball game, a player flies above the basket and drops the ball in from a height of 10 meters. If the ball takes 4.4 seconds to fall, find the acceleration due to gravity.

*October 3, 2011*

**Physics**

A dog team driven by an Inuit hunter pulls two toboggans (Figure 1.49). The dog team can apply a maximum force of 700 N. Each toboggan experiences a constant frictional force of 100 N. a) Determine the acceleration of the two toboggans, if each has a mass of 300 kg. b) What is...

*October 2, 2011*

**Chemistry**

Sam Student calibrates a flask with water at 20C. Patricia Pupil borrows the flask and Sam's calculated volume for the flask, and uses it to do her unknown at 25 C. What, if any specific effect will this have on the results of Patricia's density determination? Explain ...

*September 27, 2011*

**Is this write or wrong?**

Yes, B is the right answer.

*September 27, 2011*

**physics**

A rocket-driven sled running on a straight, level track has been used to study the physiological eﬀects of large accelerations on astronauts. One such sled can attain a speed of 440 m/s in 1.9 s starting from rest. What is the acceleration of the sled, assuming it is ...

*September 25, 2011*

**physics**

suppose that all the people of the earth went to the north pole and on a signal all jump straight up. estimate the recoil speed of the earth. the mass of the earth is 6 x 10^24 kg and there are about 6 billion people(6 x 10^9).

*September 25, 2011*

**math HELP!!**

You use compatible numbers .

*September 20, 2011*

**math HELP!!**

U would do 60,000 divided by 50 because 60,000 is close to 56,225 and 48 is close to 50

*September 20, 2011*

**math HELP!!**

U would do 60,000 divided by 50 and u would get 1,200 so the answer would be C!

*September 20, 2011*

**statistics**

compute the percentile rank of the raw score 8 in the following distribution 8,5,6,9,3,5

*September 19, 2011*

**economics**

Do you think lotteries have both micro and macro economic effects or only micro? How do lotteries change what and for whom goods and services are produced?

*September 18, 2011*

**physics**

A bus that is traveling at 35.0 km/h, speeds up at a constant rate of 3.4 m/s2. What velocity does it reach 6.8 s later?

*September 18, 2011*

**math**

Man 6 feet tall cast shadow 15 ft long. Girl is 5 ft. 10 inches how long will her shadow be

*September 12, 2011*

**math**

simplify: -8+c+(-10) simplify: -12-w+20 simplify: -3(2y-9)+y

*September 12, 2011*

**algebra 1**

45

*September 7, 2011*

**algebra 1**

Suppose you walk at the rate of 210 ft/min. You need to walk 10,000 ft. How many more minutes will it take you to finish if you have already walked 550 ft?

*September 7, 2011*

**Physics**

What is the velocity at the midway point of a ball able to reach a height y when thrown with an initial velocity v0? (Assume the ball is thrown upward and that up is the positive direction. Use the following as necessary: y and g. )

*September 4, 2011*

**Math**

My sister learned simplifying fractions and long division

*September 4, 2011*

**Physics**

The vertical position of a ball suspended by a rubber band is given by the equation y(t) = (3.4 m)sin(0.49 t/s − 0.40) − (0.4 m/s)t + 5.4 m. (a) What are the equations for velocity and acceleration for this ball? (Use the following as necessary: t.) (b) For what ...

*September 4, 2011*

**chemistry**

Calculate the amount of heat required to heat a 42kg sample of ethanol from 14.0C to 18.0C

*September 4, 2011*

**physics**

A particle has a constant acceleration of a = (5.5 m/s2)i + (3.7 m/s2)j . At time t = 0, the velocity is zero and the position vector is r0 = (9.8 m)i. (a) Find the velocity and position vectors as functions of time t. (b) Find the equation of the particle's path in the xy...

*August 30, 2011*

**physics**

A particle has a constant acceleration of = (5.5 m/s2) + (3.7 m/s2) . At time t = 0, the velocity is zero and the position vector is 0 = (9.8 m). (a) Find the velocity and position vectors as functions of time t. (b) Find the equation of the particle's path in the xy plane.

*August 30, 2011*

**English**

In Into Thin Air by Jon Krakauer, what are some examples of allusions to Shakespeare, the Bible, fairy tales, or Greek myths?

*August 27, 2011*

**statistics**

Find the first arithmetic mean between 100 and 135 given the following sequence: ..., 100, ___, ___, ___, ___, 135, ...

*August 25, 2011*

**American Government**

what do you think are some possible contemporary effects of persistent discrimination against ethnic and racial minorities?

*August 24, 2011*

**pre calculus**

how do i solve this problem: Draw the angle in quadrant I whose terminal side is on y+4x

*August 24, 2011*

**math**

6+5+4+3+2+1=21 blocks

*August 24, 2011*

**MATH PLEASE HELP!!!!!**

A student brought 34 pencils for school. If you sharpened 16 of the pencils before school, what is his ratio of on sharpen pencils to sharpen pencils

*August 16, 2011*

**math**

n=312 evaluate the expression n+(-5) for each (n)

*August 11, 2011*

**statistics**

did you find the answers?

*August 7, 2011*

**world civ**

Can you help me? Compare and contrast the empires of the Americas with those that emerged in Africa between 500 and 1500 AD. Discuss the roles played by geography, religion, trade, and politics developments in shaping societies in these regions.

*August 2, 2011*

**Economics**

What are the roles of Hayek and Keynes' theories in the economy right now?

*July 29, 2011*

**economics**

What are some ways that the lack of development in the world affects us?

*July 27, 2011*

**economics**

Thanks for your opinion.

*July 27, 2011*

**economics**

Higher than it is now. Other countries don't have the development that America does.. should this be a priority to rich countries?

*July 27, 2011*

**economics**

Should development around the world be a higher priority to the rich countries?

*July 27, 2011*

**Economics...free trade**

thanks

*July 19, 2011*

**Economics...free trade**

Are the benefits of free trade worth the losses for some?

*July 19, 2011*

**Economis**

What is the role of economic theory in the way economies are run today?

*July 16, 2011*

**psychology**

Sorry, sent in error.The question I have is I have an idea for my research on study habits. Which would be students who study alone vs. Group studies.What would be the grades on exams? and by hours of studying between self study and group studywould the grade have a difference...

*July 16, 2011*

**psychology**

so basically with what I have in mind I should research the statistics for rasmussen college students and that will give me my results

*July 16, 2011*

**psychology**

I understand that portion but are you not to show the results on your research.Outcome of both? What my conclusion is?

*July 16, 2011*

**psychology**

I wanted to base my research study example students who study alone vs.students who study in groups.What would be the difference in grades between both for their exams is my idea.I'm not sure how to get the information as far as to the outcomes based on my idea

*July 16, 2011*

**psychology**

I am haveing to prepare a research on study habits. I have the idea on how I am going to conduct.research but my question refers to numbers based on research for the college am I making those up? I ask because of course not sure if my idea I would be able to research current ...

*July 16, 2011*

**math-algebra 1**

Find the 6th term of the geometric sequence whose common ratio is 1/3 and whose first term is 7.

*July 14, 2011*

**Physics**

Determine the stopping distances for an automobile with an initial speed of 95km/h and human reaction time of 1.0s: (a) for an acceleration a= -5.2m/s^2 (b) for a= -6.7m/s^2

*July 10, 2011*

**Algebra 1**

A theater group made appearances in two countries. The hotel charges before tax in the second country were $500 lower than in the first. The tax on the hotel bill was 5.5% in the first country and 4.5%in the second. After the trip, the total tax paid on accommodation expenses ...

*July 9, 2011*

**Algebra 1**

A theater group made appearances in two countries. The hotel charges before tax in the second country were $500 lower than in the first. The tax on the hotel bill was 5.5% in the first country and 4.5%in the second. After the trip, the total tax paid on accommodation expenses ...

*July 9, 2011*

**Art History**

What are three distant characteristics by which to recognize the difference between Bronze Age Aegean, Greek, Etruscan, And Roman Art? (Especially in Sculpture)

*July 7, 2011*

**math**

4(-2/3 + 4/3)

*June 27, 2011*

**Chemistry**

Calculate the concentrations of each of the ions in 0.25 M Fe(NO3)2. a) [Fe2+], M b) [NO3-], M

*June 27, 2011*

**Chemistry**

Write a balanced net ionic equation (include physical states) for the following reaction: Fe(NO3)3(aq) + LiOH(aq) → LiNO3(aq) + Fe(OH)3(s)

*June 27, 2011*

**Chemistry**

If a solution of sodium phosphate, Na3PO4, is poured into seawater, precipitates of calcium phosphate and magnesium phosphate are formed. (Magnesium and calcium ions are among the principle ions found in seawater.) Write net ionic reactions for the reactions. Include physical ...

*June 27, 2011*

**Chemistry**

Write equations for the dissociation of the following in water. Include physical states for all species. CaCl2 (NH4)2SO4 NaC2H3O2

*June 27, 2011*

**Math**

This is hard to explain... I need to spend between $20,000 and $60,000, BUT I need to spend ALL amounts, like $1, then 2, then 3, then 4 How do I figure out how much I will spend when I'm finished?

*June 24, 2011*

**Human Resources Management**

BOS

*June 15, 2011*

**Literature**

Which one of the following lines best illustrates personification? A. The fog comes on little cat feet B. She floated graceful as a dove C. Spring is a dream unsung D. A narrow wind complains all day

*June 14, 2011*

**global history**

its neither

*May 31, 2011*

**global history**

It's definitely C

*May 31, 2011*

**Chemistry**

Now I get it, thank you so much!

*May 25, 2011*

**Chemistry**

how do you calculate the quantity of heat gained or lost? 0.60 mol of steam condenses at 100°C

*May 25, 2011*

**Chemistry**

how do you calculate the quantity of heat gained or lost?

*May 25, 2011*

**Chemistry**

0.60 mol of steam condenses at 100°C

*May 25, 2011*