Wednesday

October 1, 2014

October 1, 2014

Total # Posts: 1,497

**Physics **

Kangaroos can easily jump as far as 8.0 m. If a kangaroo makes five such jumps westward and then seven such jumps northward, what angle would the resultant displacement vector make with the northern displacement vector? What is the magnitude of the total displacement?
*September 30, 2014*

**system of equations**

today, johns mom is 5 times as old as he is. in 7 years she will only be 3 times as old. what is johns age today?
*September 24, 2014*

**physics**

a bus travels 280 km south along a straight path with an avg velocity of 88 km/h to the south. then it travels 210 km south with an avg velocity of 75 km/h to the south. a) how long does the 1st trip last? b) how long does the 2nd trip last? c) what is the avg velocity for the...
*September 21, 2014*

**physics**

an automobile with an initial speed of 43 cm/s (accelerates uniformly at the rate of 3m/s^2). what is the final speed and the displacement after 5 sec?
*September 21, 2014*

**physics**

suppose a treadmill has an avg acceleration of 4.7m/s^2. a) how much does its speed change after 5 min? b) If the treadmill's initial speed is .017 km/s, what will it's final speed be?
*September 21, 2014*

**physics**

turners treadmill runs with a velocity of 120 cm/s and speeds up at regular intervals during a half hour workout. After 25 seconds, the treadmill has velocity of 6.5 m/s. what is the avg acceleration of the treadmill during this period ?
*September 21, 2014*

**programming**

You are to write a short C program. The program will input two numbers: 1) number of miles to ship a package, and 2) the weight of the package. You are to computer the price to ship the package. The formula is as follows. If the weight of the package is <= 10 pound this the...
*September 20, 2014*

**statistics**

.3159=(88-?)/12
*September 16, 2014*

**statistics**

Anyone?!
*September 16, 2014*

**statistics**

A standardized test has a mean of 88 and a standard deviation of 12. What is the score at the 90th percentile? Assume a normal distribution. how would I solve? a. 90.00 b. 112.00 c. 103.36 d. 91.00
*September 16, 2014*

**Biochemistry**

Calculate how you would make 0.5L of a 0.5M (500mM) acetate buffer at a pH of 4.7. Available is sodium acetate and glacial acetic acid. pH=4.7 pKa of acetic acid=4.76 Not sure if I did this next part right: 4.7=4.76 + log [base]/[acid] -0.06= log [base]/[acid] 10^-0.06= [base...
*September 11, 2014*

**Mat/Statistics**

This may help as well X = {2, 2, 9, 5, 6} Y = {4, 7, 12, 8, 9}
*September 11, 2014*

**statistics**

Sorry Damon, I am confused can you elaborate? and use a, b, c, d, e so I know what you are referring to?
*September 11, 2014*

**Math**

∑(x+y) c. ∑(x+∑(y)) d. ∑x+ ∑y e. ∑(x)+ ∑(y)* what do each of these mean? what's the differences?
*September 11, 2014*

**science**

How far does your automobile travel in meters during your reaction time if you are moving at 55 mi/h (25 m/s)?
*September 6, 2014*

**Physics**

A ball is thrown from the ground. Its velocity after 4 ^ ^ seconds is (15x -3y ) m/s. the range of the ball is 205 m. 189 m. 111 m. 98 m.
*September 5, 2014*

**algebra**

How do I get the write out the problem for : The sample space is orange, purple and white. If P(orange)=2/5 and P(purple)=3/10, what is P(white)? I have written 2/5.3/10=6/15 2/5
*September 3, 2014*

**math**

120
*August 20, 2014*

**English**

Please paraphrase this: “In my experience as both a learner and later a language practitioner, one has to have a drive that will obstinately motivate one to succeed against all odds.”
*August 12, 2014*

**English**

3. Correct the following sentences for subject-verb agreement, tenses and fragments. i) My car it is very beautiful. ii) When he thought he could afford to pay his own school fees. iii) This students keep making noise. iv) When I was young, I use to love playing with dolls. v...
*August 12, 2014*

**algebra 2**

what is the answer?
*August 1, 2014*

**math**

If I have a peice of carpet that is 9 ft by 8 ft and the cost is .59 per square ft how much does it cost for the carpet?
*July 26, 2014*

**Maths**

If a*b=2a+b such that 2*3=2(2)+3,find (i) b when 3*b=b*5 (ii) d when d*(3*d)=(d*3)*d
*June 27, 2014*

**Physics**

A golfer, putting on a green, requires three strokes to "hole the ball." During the first putt, the ball rolls 5.9 m due east. For the second putt, the ball travels 2.4 m at an angle 20° north of east. The third putt is 0.50 m due north. What displacement (...
*June 26, 2014*

**statistics**

The following random sample was collected: 22 33 44 6. The 80% confidence interval for the mean is? I have the answers; however, I do not know how to plug in the numbers to solve the problem.
*June 21, 2014*

**algebra **

A triangular-shaped wall has a base of 2x=4 and a height of x+3. The area of the triangle is 56 squared inches. What is the value of x?
*June 2, 2014*

**math**

what does base mean?
*May 22, 2014*

**Algebra**

The mean is 18.1 The z-score for 13.0 is - 1.7. What is the standard deviation for this data set.
*May 19, 2014*

**statistics**

A vending machine company wants to check three of its machines to determine if they are properly dispensing 12 ounces of coffee. Their data is given below. Reference: Ref 11-4 Compute the test value for the coffee machines. Answer 2.25 5.06 6.62 4.86
*May 9, 2014*

**Statistics**

A song must be n longer than 3 minutes and 30 seconds, or (210 seconds) Micheal Jackson founds out that his mean song length is 244.6 seconds with a standard deviation of 29/3 seconds. What is the null hypothesis and the alternative hypothesis, what is the right formula and ...
*April 28, 2014*

**math**

25+6
*April 28, 2014*

**Statistics**

A song must be n longer than 3 minutes and 30 seconds, or (210 seconds) Micheal Jackson founds out that his mean song length is 244.6 seconds with a standard deviation of 29/3 seconds. What is the null hypothesis and the alternative hypothesis, what is the right formula and ...
*April 28, 2014*

**math**

Thanks!
*April 27, 2014*

**math**

write an equivalent expression to the expression below. (17 x 93)/(17 x 97)
*April 27, 2014*

**math**

write an equivalent expression to the expression below.(17*93) (17*97)
*April 27, 2014*

**ap statistics**

A fire insurance company felt that the mean distance from a home to the nearest fire department in a suburb of Chicago was at least 4.7 miles. It set its fire insurance rates accordingly. Members of the community set out to show that the mean distance was less than 4.7 miles. ...
*April 25, 2014*

**ap statistics**

The manager at Air Cargo feels that the weights of packages shipped recently are less than in the past. Records show that in the past packages have had a mean weight of 36.7 lb. and a variance of 201.64 lb2. A random sample of last months shipping yielded a mean weight of 32.1...
*April 25, 2014*

**ap statistics**

An unnoticed mechanical failure has caused one-fourth of a machine shop’s production of 10000 pistol firing pins to be defective. A random sample of 25 firing pins was drawn from the population. a.) Explain why this random variable has a binomial distribution? (2 points) ...
*April 24, 2014*

**ap statistics**

An unnoticed mechanical failure has caused one-fourth of a machine shop’s production of 10000 pistol firing pins to be defective. A random sample of 25 firing pins was drawn from the population. a.) Explain why this random variable has a binomial distribution? (2 points) ...
*April 24, 2014*

**ap statistics**

In a survey, 600 mothers and fathers were asked about the importance of sports for boys and girls. Of the parents interviewed, 70% said the genders are equal and should have equal opportunities to participate in sports. B. Using the normal approximation without the continuity ...
*April 24, 2014*

**ap statistics**

An unnoticed mechanical failure has caused one-fourth of a machine shop’s production of 10000 pistol firing pins to be defective. A random sample of 25 firing pins was drawn from the population. a.) Explain why this random variable has a binomial distribution? (2 points) ...
*April 24, 2014*

**Social Studies**

what are the real answer then Ms.Sue
*April 24, 2014*

**Social Studies**

Can somebody please check my answers? Thank you :) 1. Which is a key factor that affects the climate of mountainous Latin America? a. snow b. El Niño c. elevation ** d. sea breezes 2. Which statement best describes the economies of Central America? a. Central America&#...
*April 24, 2014*

**Chemistry**

How many grams of acetic anhydride are needed to react with 3.82g of salicylic acid?
*April 23, 2014*

**PHYSics**

a child with a mass of 29 kg sits at a distance of 4m from the pivot point of a seesaw. where should a 15 kg child sit to balance the seesaw?
*April 22, 2014*

**physics**

robin is standing terrified at the end of a diving board, which is high above the water. if robin has a mass of 75 kg and is standing .6m from the board's pivot point, what torque is robin exerting on the board
*April 22, 2014*

**statistics**

We guess, based on historical data, that 30% of graduating high-school seniors in a large city will have completed a first-year calculus course. What's the minimum sample size needed to construct a 95% confidence interval for a proportion with a margin of error of 2.5%?
*April 22, 2014*

**Precalculus**

Show: sin(a-b) sin(a+b) = sin^2 a - sin^2 b
*April 21, 2014*

**EXP 105**

I need help with my grammar quiz in week 2.
*March 31, 2014*

**Statistics**

A population has a standard deviation of 15.2. How large a sample must be drawn so that a 95% confidence interval for the population mean will have a margin error equal to 3.5?
*March 26, 2014*

**`Statistics**

A public relations firm found only 9% of voters in a certain state are satisfied with their US senators. How large a sample of voters should be drawn so that the sample proportion of voters who are satisfied with their senators is approximately normally distributed?
*March 26, 2014*

**Chemistry**

[OH─] = 0.10 M [OH─] = 0.20 M t(min) Abs ln(Abs) Abs ln(Abs) 0 1.000 0.000 1.000 0.000 1 0.905 -0.100 0.678 -0.389 2 0.811 -0.209 0.451 -0.796 3 0.735 -0.308 0.288 -1.245 4 0.664 -0.409 0.185 -1.687 this is what the table looks like because my explanation of it ...
*March 19, 2014*

**Chemistry**

I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different concentrations of OH...
*March 19, 2014*

**Biology**

Briefly describe a portal system and give the location of two portal systems in the human body.
*March 18, 2014*

**Chemistry**

The data below has been taken for the reaction of a dye with the hydroxide ion. The reaction was performed at two different hydroxide ion concentrations while the dye concentration was kept constant. What is the rate law? [OH─] = 0.10 M [OH─] = 0.20 M t (min) Abs ...
*March 13, 2014*

**chemistry**

how many grams of sodium metal are needed to give 781 g of hydrogen?
*March 13, 2014*

**Chemistry**

How do I balance the following reaction in acidic conditions? N2O4 + S8 = NO + H2SO3????
*March 11, 2014*

**math. plzz help**

I got the last one. I'm pretty sure it's 14.8.
*March 11, 2014*

**math. plzz help**

I'm currently working on this too. The first one is 5.8, the second one is 14.7, and I'm not too sure what the third one is. :)
*March 11, 2014*

**physics**

a water balloon launcher with a mass of 4 kg fires a .5 balloon with a velocity of 3m/s to the east. what is the recoil velocity of the launcher?
*March 10, 2014*

**Social Studies**

2. How does India’s form of government contrast with the governments of Pakistan and Afghanistan? India is an Islamic republic; the others are not. Pakistan and Afghanistan have a long history of democratic government. India does not have a constitution. India is a ...
*March 6, 2014*

**chemistry**

a barometer is read directly in torrs or mm Hg. an open-end manometer has a closed arm liquid height of 48.4 mm and an open arm liquid height of 62.6 mm. if the air pressure is 758.0 torrs, what is the pressure of the gas connected to the manometer?
*March 5, 2014*

**statistics**

.05,.07
*March 5, 2014*

**College Algebra**

write the equation for the line that passes through the point (-4,7) and is perpendicular to 3y-8=x-4. leave equation in thw point-slope form show all work
*February 26, 2014*

**physics**

great, thanks so much!
*February 25, 2014*

**physics**

I'm sorry, I wrote the question wrong! Correctly, the questions reads: A 1.761 km car is moving down a slope of 12% at a constant velocity of 17 m/s. What I'd the direction and magnitude of the frictional force? Again, sorry!
*February 25, 2014*

**physics**

A 1.761 km car is moving down a road with a slope (grade) of 12% at a constant direction and magnitude of the frictional force? Please show step by step if possible, I am extremely lost! Thanks!
*February 25, 2014*

**US history**

thank you for this Mrs. Sue :) this exactly what i need!
*February 19, 2014*

**US history**

a colonist as in like when they sailed in the mayflower and a those pioneers that traveled on the Oregon trail
*February 19, 2014*

**US history**

what are the similarities between a pioneer and a colonist?
*February 19, 2014*

**Math**

A board is 6 3/4 feet long.If 2/3 of the board is cut off, what is the length of the piece that is cut off.
*February 5, 2014*

**Math**

Eden took a quiz with 15 problems and got 3/5 of the problems correct.how many problems did she get correct.
*February 5, 2014*

**Science**

whats the whole idea of gearing up and/or down in robotics? (someone mentioned it's like stick shift-but I don't drive so...) when is it each one?
*February 3, 2014*

**US history**

what happened as a result of the Second Bank of the United States not having its charter renewed in 1836??? ***was inflation involved???
*January 30, 2014*

**Finance**

The ________ model is usually considered the best of the capital budgeting decision-making models. A) Internal Rate of Return (IRR) B) Discounted Payback Period C) Profitability Index (PI) D) Net Present Value (NPV) Is the correct answer D. (NPV)
*January 23, 2014*

**Intro to Computers**

You are setting up a desktop computer for an AutoCad specialist who needs a minimum of 125 GB of RAM. Which operating system below would be best-suited for his needs? A. Windows 8 Home 64-Bit Edition B. Windows XP 32-Bit Professional Edition C. Windows Millennium 64-Bit ...
*January 13, 2014*

**US history**

What is the purpose or reason for the Factory system and when was it invented????
*January 12, 2014*

**Introduction to Computers**

The command prompt found on Windows 7 and Windows 8 is very similar to the interface of what past operating system? A. Dos B. Windows 95 C. Windows 98 D. Windows NT
*January 9, 2014*

**Math**

Wait. How could you add 6 on both sides if the (1/4)n has been subtracted on both sides?
*January 9, 2014*

**Math**

Okay, but I was stuck when trying to find the answer. My process was: n-6=(1/4)n n=(6^1/4)n at this step I am stuck to know what to do next. Please help.
*January 9, 2014*

**Math**

When it says, "Paulo has a certain amount of money. If he spends six dollars, then he has 1/4 of the original amount left." So would the equation be n-6=1/4?
*January 9, 2014*

**English **

(1) We decided to climb Mt. Rainer, but it was a long, hard journey to Washington State from Medford, Oregon. (2) We were worried about our likely sucess in the cold enviroment of the upper slopes. (3) For one thing, Marty was broke and anxius about having warm clothes for ...
*January 9, 2014*

**English**

Thank you
*January 7, 2014*

**English**

Complete the following sentence with a word or words that show a logical relationship. Joshua took a nap _______ sorting the mail. A. after B. instead of C. while D. before
*January 7, 2014*

**math**

Write 2005693 in expand form using powers of tens
*December 30, 2013*

**social studies**

explain why the framers of the constitution didn't want any of the branches to be more powerful than the other branches?
*December 18, 2013*

**English**

What is the definition for "Vague Optimism"?
*December 17, 2013*

**Science**

What are the reason why Global Warming is destroying our environment? And what causes Global Warming?
*December 17, 2013*

**Algebra**

what is the inverse of the linear parent function? How would you graph the inverse and what are the values for the inverse???
*December 16, 2013*

**English**

what does it mean by "How does each question that begins "Will you join the battle" directly address the audience to whom Johnson is speaking?"
*December 16, 2013*

**English**

What does it mean by "What is the supporting idea in this part of the speech?"
*December 16, 2013*

**Algebra**

what is the inverse of the linear parent function y+x?? and what are its point/values???
*December 14, 2013*

**Social Studies (History)**

Why were women the active leaders in the effort of the temperance movement?
*December 11, 2013*

**Social Studies (History)**

What was the Women's Club about?
*December 11, 2013*

**Social Studies (History)**

What would be two concerns with women leaving their home to go to work in the late 1900s and early 1900s?
*December 11, 2013*

**college intermediate algebra**

Working together, two people can mow the lawn in 24 minutes. Working alone, one person takes 20 minutes longer than the other. How many minutes would it take each person to mow the lawn alone? Thanks!!!
*December 10, 2013*

**Intermediate Algebra (College)**

...I don't know thats exactly why I was asking actually. cool. thanks.
*December 10, 2013*

**Intermediate Algebra (College)**

That's exactly what I was thinking, then I was also thinking, wouldn't this work? 14 - 5/x = x^2 14 - 5 = x^3 9 = x^3 ???
*December 10, 2013*

**Intermediate Algebra (College)**

Solve algebraically: 14/x^2 - 5/x = 1 Thank you!!! (:
*December 10, 2013*

**Physics**

If a person lifts a 21.9 kg bucket very slowly from a well and does 8.3 kJ of work on the bucket, how deep is the well?
*December 7, 2013*

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