Monday

November 24, 2014

November 24, 2014

Total # Posts: 208

**Statistics**

A sample of n=20 has a mean of M = 40. If the standard deviation is s=5, would a score of X= 55 be considered an extreme value? Why or why not? I understand that the score in question is 3 standard deviations above the mean. But I thought that I would need to convert this to a...
*November 9, 2014*

**Statistics**

A sample of n=20 has a mean of M = 40. If the standard deviation is s=5, would a score of X= 55 be considered an extreme value? Why or why not?
*November 9, 2014*

**geometry**

A total solar eclipse occurs when the moon passes between the earth and the sun, and the darkest shadow cast by the moon, called the umbra, hits the surface of the earth. If the umbra does not hit the surface, as shown in the following figure, then a total solar eclipse is not...
*November 6, 2014*

**Statistics**

The manufacturer of Sleepeze has asked you to test the effectiveness of the drug. You decide to test the effectiveness using the drug and a placebo. You select a select a group of 500 subjects and randomly assign them to either the treatment group or the placebo group. Is this...
*October 16, 2014*

**Statistics**

I think the cubes are the packages of soda, maybe a large quantity. I said it was observational study because there was no treatment imposed.
*October 16, 2014*

**Statistics**

A supermarket chain wants to verify that the bottler of their store brand of soda is in fact filling the cans to the specified volume. They took several “cubes” from the shelves and measured the amount in each can. Is this an observational study or a designed ...
*October 16, 2014*

**Statisitics**

So for the American vacationers example is the Population - all Americans or all American Vacationers?
*October 16, 2014*

**Statisitics **

Identify the population, and the sample in each of the following: A small college has 275 tenured full and associate professors. Twenty professors are randomly chosen to take part in a survey about the incorporation of technology into their teaching approach. A survey of 1023 ...
*October 16, 2014*

**Economics**

Very confused on how to figure these out. Suppose that the following table shows the weekly visits to an amusement park as a function of the daily admission fee charged: #visits daily fee 200 $50 400 $40 600 $30 800 $20 1000 $10 What is the price elasticity of demand when the ...
*September 9, 2014*

**Economics**

Use the concept of demand price elasticity to explain why grocery store items are often available to shoppers who have “coupons” clipped from local newspapers at a lower price than they are available to shoppers who don’t have coupons.
*September 9, 2014*

**math**

at a college function a total of 180 tickets were sold. the tickets were priced at $5,10,15 and the money collected that day was $1,900. the sum of the numbers of $5,and $15 tickets sold was twice the number of $10 tickets sold. find the number of each type of ticket sold for ...
*May 16, 2014*

**Programming Concepts**

Can someone please explain to me how I can get the solution for this question. Use the top-down modular approach and pseudocode to design a suitable program to help you solve this problem. Whenever appropriate,validate the input data. Find the sum of the squares of the ...
*May 13, 2014*

**algrebra**

Christine purchased a prepaid phone card for . Long distance calls cost cents a minute using this card. Christine used her card only once to make a long distance call. If the remaining credit on her card is , how many minutes did her call last?
*May 12, 2014*

**PreCalculus**

A lake formed by a newly constructed dam is stocked with 1,000 fish. Their population is expected to increase according to the logistic curve N=30/(1+29e^-1.35t) where N is the number of fish, in thousands, expected after t years. The lake will be open to fishing when the ...
*April 26, 2014*

**calculus**

x^4 + 2x^2 + 1 = 0 (x^2)^2 +2x^2 +1 = 0 (x^2 + 1)^2 = 0 I don't know where to go now although I know the answer is x = i, -i
*April 19, 2014*

**statistics**

What is wrong with the statement: It is believed that the proportion of Middle School teachers who leave the profession within 5 years is different from the proportion of High School teachers who leave the profession within 5 years. Test with a level of significance of 0.05. ...
*April 14, 2014*

**Math**

Sorry I typed my answer wrong I did have 330. Thanks so much for explain it to me this always confuses me when I haven't done it in a while. Thank you both
*February 27, 2014*

**Math**

I don't know the longest side just the shortest side of 150ft
*February 27, 2014*

**Math**

150 x 2= 300 and then 960-300=660 Then 600/2= 300 Is that right?
*February 27, 2014*

**Math**

perimeter of a rectangular shap is 960 ft. The shortest side is 150ft. What is the length of the longest sides?
*February 27, 2014*

**math**

THANKS
*February 27, 2014*

**math**

What is the length of the shortest side of the room if the area is 240 sq ft and the longest side of the room is 20 ft?
*February 27, 2014*

**Chemistry**

An electron traveling at 3.1 x 10^5 m/s has an uncertainty in it's velocity of 1.07 x 10^5 m/s. What is the uncertainty in it's position?
*February 24, 2014*

**PreCal**

I don't think 10 is correct. I did it long hand 1,2,4,8,16,32,64,128,256,512,1024,2048, 4096 = 13 stacks.
*December 1, 2013*

**PreCal**

You have 1000 coins. Start by placing one coin in its own "stack." Next to the first stack, make a stack of two coins. Then make a stack of four coins and continue creating stacks of coins, each stack twice as high as the previous one. Now I figured it would be 13 ...
*December 1, 2013*

**Math**

None of those b/c the 2nd b is b^4 It is 8a^4b^3 + 6a^3b^4 - 2^3b^4
*December 1, 2013*

**PreCal**

A country X has a population growth rate of 3%. How many years will it take the population of country X to double? Use continuous compound growth So I used A=Pe^.03n I know A has to be double P. e^.03 = 1.0304543954 but now I'm lost
*December 1, 2013*

**PreCal**

1n e^5 a little confused how to determine exact value Is it? log(e)e^5 e^x=e^5 x=5
*December 1, 2013*

**PreCal**

Find all real numbers x and y so I'm a bit confused with the y solution -2x-4+2yi=3x-2i 2yi=5x-2i+4 I know the answer is y = -5ix/2 - 2i - 1 so y = -1 But how do you go from 2yi = 5x - 2i + 4 to y = -5ix/2 - 2i - 1
*December 1, 2013*

**PreCal**

Find all solutions to the equation, x-8(sqrt x)+16=0. Is x=16 the only solution?
*November 30, 2013*

**PreCal - repost**

A trainee is hired by a computer manufacturing company to learn to test a particular part of a personal computer after it comes off the assembly line. The learning curve for an average trainee is given by N=200/4+21e^-0.1t How many computers can a trainee be test after 2 days ...
*November 30, 2013*

**PreCal**

Oops 21e^-0.2 I mean
*November 30, 2013*

**PreCal**

A trainee is hired by a computer manufacturing company to learn to test a particular part of a personal computer after it comes off the assembly line. The learning curve for an average trainee is given by N=200/4+21e^-0.1t a)How many computers can a trainee be test after 2 ...
*November 30, 2013*

**PreCal**

Great. Thanks so much
*November 30, 2013*

**PreCal**

I'm so confused. How did you figure it out.
*November 30, 2013*

**PreCal**

This is a solved problem. Deposit $1000 @ 8% compounded continuously. How many years before it doubles. Solved: Use A=Pe^.08 , so 2000=1000e^.08n then 2=e^.08n then take natural log (1n) of both sides. end up with 1n 2 = .08n so that n= 1n 2/.08 approx= .6931/.08 approx=8.66 ...
*November 30, 2013*

**PreCal**

A person deposits $1000 in a bank account which pays 8% annual interest compounded continuously. Used formula A=Pe^in You get A=(1000)e^.08(1)=1000e^.08≈ 1000(1.08329) ≈ $1,083.29 My question is how do you get 1.08329 from e^.08
*November 30, 2013*

**PreCal**

So does that mean x=3? (so 3x3x3=27)
*November 29, 2013*

**PreCal**

I'm suppose to solve log(3)-27=x I get 3^x=-27 I can't go any father correct?
*November 29, 2013*

**PreCal**

Find all real numbers x and y -2x-4-2yi=3x-2i 5x+2yi=-4+2i 5x=-4 so x=-4/5 2yi=2i so you =1 This was what I got by an online calculator said x=-4/5-2iy/5+2i/5 y=5ix/2+2i+1 Which is right?
*November 10, 2013*

**PreCal**

express in form a+bi (1+2sqrt3)(2-3sqrt-3) so I came up with 2-3i sqrt3 + 4sqrt3 - 18i Is that solution a+bi form
*November 10, 2013*

**PreCal**

Bob Well that was simple. I couldn't find an example in my text like this. Thanks so much.
*November 10, 2013*

**PreCal**

Determine the value of c for which the following quadratic equations will have one root. x^2-5x+c=0 I have no idea what formula to use to figure this out.
*November 10, 2013*

**Algebra**

5/3x-7≤2 Solve. Note in interval notation So I got 19/6≤x the other is suppose to be x less than 7/3 but I can't get that How do you get that
*October 27, 2013*

**Algebra**

So how did you decided the 1 went with the x's and not the other equation.
*October 23, 2013*

**Algebra**

All real # x and y that satisfy -2x-1+2yi=4x-5i first step is place constant complex # on one side -2x+2yi-4x=1+5i -6x+2yi=1+5i now I'm lost
*October 23, 2013*

**Math**

find all real numbers x and y that satisfy -2x-1-2yi=4x-5i I think the first step is rewrite with constant complex on one side. -2x-2yi-4x=1-5i now I'm lost
*October 23, 2013*

**algebra**

(x)(x)=x=72 8x8+8=72 64+8=72
*October 23, 2013*

**algebra**

(x)(x)=x=72 8x8+8=72
*October 23, 2013*

**statics**

This problem will introduce the learner into a technique called Analysis of Variance. For this course we will only conduct a simple One-Way ANOVA and touch briefly on the important elements of this technique. The One-Way ANOVA is an extension of the independent –t test ...
*October 19, 2013*

**Statics**

Lilly collects data on a sample of 40 high school students to evaluate whether the proportion of female high school students who take advanced math courses in high school varies depending upon whether they have been raised primarily by their father or by both their mother and...
*October 19, 2013*

**intro to stats**

A very small population consists of 7 units, labeled a; b; c; d; e; f; g. How many different samples of size 3 are there, for sampling without replacement, assuming that (a) samples are lists of units. (b) samples are sets of units.
*September 3, 2013*

**essay**

how to write a 15min essay about myself
*April 29, 2013*

**Algebra**

Use the graph to find the solutions of the given equation -X power 2 +36 = 0 graph is parabola downward open
*April 10, 2013*

**statistics**

The ages of five randomly chosen cars in the parking lot are determined to be 7,9,3,4 and 6 years old. If we consider this sample in groups of 3, what is the probability of the true mean falling between 5.5 and 6.5?
*April 9, 2013*

**algebra 1**

What is the speed, in miles per hour, of a toy car that runs 40 feet in 8 seconds? Round your answer to the nearest whole number. (1 hour = 3600; 1 mile = 5280 ft)
*April 5, 2013*

**Math106**

A couple deposits 459 per month paying 6% compounded monthly how much would be in the account in 5 years
*March 25, 2013*

**statistics**

I am seeing some inconsistencies with regards to finding the upper and lower quartiles when you you have an odd number in your data set. Which is correct, counting the median in both your upper and lower set, or ignoring it?
*March 1, 2013*

**algebra**

your club is in charge of making pins that students can buy to show their school spirit for the upcoming football game. you have 225 so far and you only have 2 hrs. left to make the rest of the pins. you need to make at least 400 pins.
*February 13, 2013*

**Math**

tom has a collection of 50 cds and nita has a collection of 38 cds. Each month tom adds two cds and nita adds four how many months will it take until they have the same amount?
*January 30, 2013*

**Math**

Hobbies: A book club charges a membership fee of $20 and then $12 for each book purchased. a. Write and graph a function to represent the cost y of membership in the club based on the number of books purchased x. b. what if...? Write and graph a second function to represent ...
*January 25, 2013*

**5th grade math**

No I think three, two girls one boy. Susie has on brother one sister the boy has no brothers but has two sisters
*November 14, 2012*

**5th grade math**

Five
*November 14, 2012*

**Calc 1**

What is the derivative of dS=x^2+ 5488/x?...
*November 14, 2012*

**QNT351**

use a 95% confidence interval to estimate the difference between the population means. Interpret the confidence interval. random sample 390 x1 5258 s1 152 x2 5220 s2 192
*September 27, 2012*

**physics**

A chain of ocean waves crests at 35m apart , 15 miles/hr. What is the frequency of the waves?
*September 19, 2012*

**Pharmacy Math**

320ml of active ingredient is added to 680 ml of an alcohol based solution. What is the final strength (v/v)?________
*July 30, 2012*

**pre cal**

simplify sin (8x) using only sin(x) and cos (x)
*June 29, 2012*

**Pre cal**

Sec^2x=2 With 10 different answers
*June 29, 2012*

**Math**

Thank you
*May 13, 2012*

**Math**

A die is rolled, and the number that falls uppermost is observed. Let E denote the event that the number shown is even, and let F denote the event that the number is odd number. A. Are the events E and F mutually excluseve? B. Are the evnts # and F complementary?
*May 13, 2012*

**Math**

Luis has $150,000 in his retirement account at his present company. Because he is assuming a position with another company, Luis is planning to "roll over" his assets to a new account. Luis also plans to put $3000/quarter into the new account until his retirement 20 ...
*April 29, 2012*

**Math**

Steinwelt Piano manufactures uprights and consoles in two plants, Plant 1 and plant 2. the output of plant 1 is at most 300/month, and the out put of plant 2 is at most 250/month. theses pianos are shipped to three warehouses that serve as distribution centers for Steinwelt. ...
*April 24, 2012*

**Math**

Steinwelt Piano manufactures uprights and consoles in two plants, Plant 1 and plant 2. the output of plant 1 is at most 300/month, and the out put of plant 2 is at most 250/month. theses pianos are shipped to three warehouses that serve as distribution centers for Steinwelt. ...
*April 23, 2012*

**Math**

The quantity demanded each month of russo Espresso Makers is 250 when the unit price is $140; the quantity demanded each month is 1000 when th e unit price is $110. the suppliers will market 750 expresso makers if the unit price is $60 or higher. At a unit price of $80 they ...
*April 9, 2012*

**Finite Math**

The quantity demanded each month of russo Espresso Makers is 250 when the unit price is $140; the quantity demanded each month is 1000 when th e unit price is $110. the suppliers will market 750 expresso makers if the unit price is $60 or higher. At a unit price of $80 they ...
*April 9, 2012*

**chemistry**

what pressure, in atmosphere, is exerted by 0.52 mol of water vapor at its boiling point of 100 degrees celcius in a 3L teakettle?
*April 1, 2012*

**AVSC**

Consider the low-speed flight of the Space Shuttle as it is nearing a landing. If the air pressure and temperature of the shuttle are 1.2 atm and 300 K, respectively, what is the air density? Note: 1 atm = 101325 N/m^2. Hint: Use ideal gas law!
*March 5, 2012*

**Statistics**

Why do so many of life's events share the same characteristics as the central limit theorem?
*March 1, 2012*

**chem**

What happens to a catalyst in a reaction? a. it remains unchanged b. it is incorporated into the products c. it is incorporated into the reactants d. it evaporates
*December 30, 2011*

**chemistry**

So the answer would be positive 120 kJ?
*December 30, 2011*

**physics**

A vehicle with an initial displacement of 10.om and an initial velocity of 16.0 m/s accelerates at an average rate of 0.50 m/s2 for 4.0 s. What is the vehicle's displacement after 4.0 s?
*November 30, 2011*

**Discrete Math**

How many handfuls of 15 are possible with at least one piece of each flavor - 50 cherry, 50 strawberry, 40 orange, 70 lemon, and 40 pineapple by assuming the pieces of flavor are identical?
*October 27, 2011*

**math**

solve for x 3x/4 - 21x/32 = 1 1/8
*September 21, 2011*

**calculus**

What is the fourth derivative of this fifth degree polynomial? 5x^5+2x^4+7x^3+x^2+x+42?
*September 8, 2011*

**MIS**

First no one ask you to do their home work, please stop saying that. Just what you to lead me in the right direction.What competitive strategy are the credit card companies pursuing
*July 16, 2011*

**MIS**

First no one ask you to do their home work, please stop saying that. Just what you to lead me in the right direction.
*July 16, 2011*

**geometry **

Given: BD is a diameter m 1 = 100°m BC = 30° m 2 = ?degrees Given: BD is a diameter m 1 = 100°m BC = 30° m 3 = ? degrees Given: BD is a diameter m 1 = 100°m BC = 30° m 4 =? degrees Given: BD is a diameterm 1 = 100°m BC = 30° m AD = ?degrees ...
*June 21, 2011*

**geometry **

If m angle 1 = 90°, what is m ADB?
*June 21, 2011*

**Algebra I**

The area of a rectangular swimming pool is given by 5x^2-31x-28ft^2. One side length of the pool is given by 5x + 4 feet. What is an algebraic expression for the other side length of the pool?
*May 29, 2011*

**allied health part 2**

a. is the answer
*April 13, 2011*

**vocab**

yeah im just in a hurry because this essay was due today and i stayed home to finish it so the sooner i can get an answer the better...
*April 12, 2011*

**vocab**

Im writing a literary analysis and i need to know if this is the correct way to use the word appreciable. "While the act of murder is a horrible crime, in the instances that Harry Morgan takes the lives of others he is either left with no other choice or does so to avoid ...
*April 12, 2011*

**literature**

ok, i see. thank you.
*April 12, 2011*

**literature**

Im writing a literary analysis and i need to know if this is the correct way to use the word appreciable. "While the act of murder is a horrible crime, in the instances that Harry Morgan takes the lives of others he is either left with no other choice or does so to avoid ...
*April 12, 2011*

**Physics**

Two point charges, one of +3.00 10-5 C and the other -5.00 10-5 C are placed at adjacent corners of a square 1.400 m on a side. A third charge of +5.70 10-5 C is placed at the corner diagonally opposite to the negative charge. Calculate the magnitude and direction of the force...
*April 3, 2011*

**goemetry **

A segment is divided into two parts having lengths in the ratio of 5:3. If the difference between the length of the parts is 6," find the length of each part. x = ? segment 1 = (5x) = ? inches segment 2 = (3x) = ? inches
*March 9, 2011*

**geometry**

A segment 12" long is divided into two segments having lengths in the ratio of 2:3. Find the length of each segment. (Hint: Let 2x and 3x represent the length of the parts.) x = ? segment 1 = (2x) = ? inches segment 2 = (3x) = ? inches
*March 9, 2011*

**math 6 th**

A rectangle has a 60-centimeter perimeter. What is the greatest possible area the rectangle could have?
*March 3, 2011*

**geometry**

If AB = 6, ST = 8, AC = 12, A = 40°, T = 20°, then what does BC = ? = ?
*January 14, 2011*