Wednesday
September 17, 2014

Posts by martha


Total # Posts: 254

statistics
The following list is a sampling of the costs of various statistics textbooks used at several colleges. Give the upper confidence limit for a 95% confidence interval estimate for the mean cost of all statistics textbooks. 109.95; 92.00; 96.70; 84.85; 92.60; 84.45; 90.95; 77.00...
July 31, 2014

Physics
I know this is long but can someone just explain it to me? Please? Don't have to give the answer, I'm just confused :( 1. An experiment was devised to investigate the effects on the temperature of a cup of hot tea when lemon juice is added at different time intervals. ...
June 3, 2014

Math
A triangular piece of land has a base of 12 yards and a height of 16 yards.what is the area of the piece of land?
April 23, 2014

physics
From a to b Wg= Fx cos 90 = 0 Wn= Fx cos 90 = 0 Wnet=Efk - Eik. Which is = to 1/2mVf^2 -1/2 mVi^2. Fxcos(0)= Efk. Cos of 0 =1. Vi =0 so use Efk Fx=1/2mVf^2 2Fx/m = Vf^2 Vf^2= square root of2Fx/m Vf= 9.77m/s X = distance, m= mass, F= force, V= velocity Efk = final kinetic ...
March 23, 2014

physics
7. ( 11E ) a) Find the momentum of an automobile of mass 2630 kg traveling 21.0 ms .b) Find the velocity ( in km/h ) of a light auto of mass 1170 kg so that it has the same momentum as the auto in part ( a ).
March 23, 2014

physics
52.(52G) A 110-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 350 N. For the first 15 m the floor is frictionless, and for the next 15 m the coefficient of friction is 0.30. What is the final speed of the crate?
March 23, 2014

math
100
March 19, 2014

math
What numbers value is 100, 000 less than 1, 547, 298?
March 19, 2014

statistics
A clinical trial test a method designed to increase probability of conceiving a girl.In study 375 were born and 300 were girls Use sample data to construct 99%confidence interval of percentage girls born
March 17, 2014

Math
Find the standard form of the equation of a line passing through (2, 3) and parallel to 3x + 5y = 2
March 8, 2014

Math
If x varies directly as y, and if x = 6 when y = 15, find y when x = 30
February 20, 2014

Math
If x varies inversely as y, and if x = 24 when y = 6, find x when y = 15.
February 20, 2014

Math
The 80 students in the 5th grade at north side elementary school voted for their favorite animal after a trip to the zoo.the elephant received 3/5 of the votes.how many votes did the elephant receive.
February 5, 2014

Math
It takes Kelly 3/4 hour to bake a small loaf of bread.how many loaves of bread can she bake in 3 3/4 hours if she bakes one loaf at a time.
February 5, 2014

Math
Tickets for the school play were $6.00 and 1/5 of each ticket paid for the cost of printing the programs.how much of each ticket went towards printing the programs.
February 5, 2014

Math
The area of a rug was 45 square ft.the rug was separated equally into four colors.how many square feet were there in each color?
February 5, 2014

Geometry
In geometry, a common standard setting for enlarging on a copy machine is 121 percent. What does this mean?
November 25, 2013

Geometry
How many diagonals does a prism have whose base is a regular polygon with 3 sides?
November 24, 2013

business math
Sam Long anticipates he will need approximately $225,000 in 15 years to cover his 3-year-old daughter’s college bills for a 4-year degree.How much would he have to invest today at an interest rate of 8 percent compounded semiannually?
October 25, 2013

math
Joanne and Ed Greenwood built a new barn with an attached arena. To finance the loan, they paid $1,307 interest on $45,000 at 4.0%. What was the time, using exact interest?
October 14, 2013

physical science
A 12-kg iron ball is dropped onto a pavement from a height of 90m. Suppose half of the heat generated goes into warming the ball. What is the temperature increase of the ball in degree C
October 6, 2013

college algebra
Find the intercepts of the function f(x). f(x) = (x - 2)2(x2 - 9)
September 12, 2013

math
16
August 10, 2013

Math
James has 10,000 to invest. If he invest money in a savings account that pays 4% APR, calculate the following: a) how long will it take to have a total of 15,000 if interest is compounded quarterly (3months)? b)how much will he have after 7yrs if interest is compounded yearly...
April 28, 2013

math
Compound Interest Question James has 10,000 to invest. If he invest money in a savings account that pays 4% APR, calculate the following: a) how long will it take to have a total of 15,000 if interest is compounded quarterly (3months)? b)how much will he have after 7yrs if ...
April 28, 2013

Public Speaking
Thanks so much for your help! I received a 100 :)
April 26, 2013

Public Speaking
To avoid speaking in monotone, a strategy to use can include: A. changing pitch and tone of voice. B. voice inflection. C. varying rate and pace of speaking. D. All of the above I read through my notes and I see A and B as answers, I don't see anything about C... But I'...
April 26, 2013

accounting
how to The beginning inventory of merchandise at Francesca Co. and data on purchases and sales for a three-month period are as follows:
March 27, 2013

math
I made a area in my question i meant to say how do you work this problem?what precent of 3.5 is 7.2.
March 15, 2013

math
HOW THE YOU WORK THIS PROBLEM?WHAT PRECENT OF 3.5 IS 7.2
March 15, 2013

Economics
In two or three paraghaphs,discuss how industrial growth in Texas has affected its natural resources
January 15, 2013

Physics
What is the magnitude of the electric field 0.3 m from a 10-4 C point charge?
December 2, 2012

pre calculus
24
November 30, 2012

math
perform the indicated operation and expres your answer in simplest radical form ^3 sqrt 8 / ^4sqrt 8
November 25, 2012

calculus
Wiley jumps straight up in the air from the edge of a cliff so that when he comes down he falls off the cliff. The cliff is 40 feet off the ground. His height t seconds after he jumps is s= -16t2 + 12t + 40.What is the maximum height? What is his maximum velocity?
November 12, 2012

calculus
let f(x) = 2x^5-5x^4 find open intervals on which f is a) increasing b)decreasing Find values of x at which f has c) relative max and min find open intervals d) concave upward e) concave downward c) find the inflection points of f
November 4, 2012

Physics
How many calories it take to elevate the temperature of 10 gr of water-from 26C to 50C?
October 22, 2012

MATH
BENNY PLAYS TWO SPORTS. HE PLAYS SOCCER FOR 3/4 OF THE TIME AND PLAYS BASEBALL FOR 30-MINUTES. HOW MANY MORE MINUTES DOES HE PLAY SOCCER THAN BASEBALL? My answer is he plays soccer 7 minutes more. Am I correct. How do I make a diagram for this problem. Thanks
October 9, 2012

Math
thanks
October 8, 2012

Math
Ms. Kenny grew 3/5 as many zinnias as Mr. Hadam. If Ms. Kenny has 12 zinnias, how many zinnias do they have in all. I calculated that they have 20 zinnias total. Am I correct. Thanks
October 8, 2012

Jr. Math
thanks
October 8, 2012

college algebra
solve x^6 - 64 = 0
October 5, 2012

College Algebra
solve the equation for r: S= (rL-a)/(r-x)
September 25, 2012

math
how would you fidn the area of a square if you know one side is 4 feet long
September 17, 2012

physics
Landing with a speed of 87.7 m/s, and traveling due south, a jet comes to rest in 939 m. Assuming the jet slows with constant acceleration, find the magnitude and direction of its acceleration. Magnitude of acceleration
September 5, 2012

math
a convenience store sells 1650 items,are of 12/25 junk food
July 24, 2012

Physics
Assuming that the Earth is spherical and recalling that latitudes range from 0° at the Equator to 90° N at the North Pole, how far apart, measured on the Earth's surface, are Copenhagen (55.67° N latitude), and Rome (41.90° N latitude)? The two cities lie ...
June 15, 2012

math
The equation of a parabola is y=(x-5)^2-4. Is the point (5,-6) on this parabola?
June 6, 2012

math
Find the value of C that will make 25x^2-40x+c a perfect trinomial.
June 6, 2012

math
Nine cards are numbered 1-9. what is the probability of drawing a number greater than 6 or an odd number. I know the answer is 2/3 but I don't know how you find the probability when it says "greather than 6 OR and odd number"... how do you calculate the OR?
June 6, 2012

math
Given a right triangle ABC, if the measure of angle B=30 degrees, the measure of angle C=90 degrees, and AB=5cm, find AC
June 6, 2012

Chemistry - Equilibrium
You have an unknown concentration of ammonia. When you add 15.0mL of a 0.400 M HCl solution to 50.0mL of the ammonia solution, the pH of the solution becomes 8.75. What is the concentration of the original ammonia solution? [Kb (NH3) = 1.8 x 10^-5]
April 25, 2012

math
only 5% of the carbon-14 in a small wooden bowl remains , how old is the bowl? Hint, half-life for carbon –14 us 5730 years
April 4, 2012

math 125
solve the system 2x-3y-z=-8 x-y--z=-2 -4x+3y+z=6
March 24, 2012

math
how would you solve: (t-2)(3t-1)(4t+3)-(2-t)(2-t)(t+5)
February 26, 2012

biology
Can someone please explain to be the concept of - Rate of exchange is proportional to a cells surface area and ... the amount of exchange material is proportional to a cell's volume. (the topic we are learning is called "Animal form and function")
February 14, 2012

Languages
How do you say the word "love" and "kind" is many languages. (the language doesnt matter, a list would be great)
February 12, 2012

algebra
2w -4 = l 2w +2l = 172 plug in for l and find w. then plug in w to find l then a=lw
February 4, 2012

Pre-Algrebra
1. first distribute 2(m+3) = 2m + 6 then add like terms together 3m + 6 = 78 then sub. 6 3m= 72 last divide by 3 m=24
February 4, 2012

History- spanish
thanks
February 4, 2012

History- spanish
i already searched that under google and most of the sites only showed and described a certain painting of his. And no i couldnt find it. It doesnt say this birthname was anything different than Jose antonio Velazquez so is taht it??
February 4, 2012

History- spanish
What was Jose Antonio Velazquez's birth name? I do not know if that is his birth name
February 4, 2012

science
I have a test tomorrow and i need to be able to say what type of bacteria something is in their agar colonies. I am having a hard time diffirentiating between bacillus cereus and bacillus subtilis. does anyone have any good websites that would help? or know any tricks?
January 31, 2012

science
what does oxytetracycline contain that would destroy bacillus cereus
January 29, 2012

Physics
The Victoria Falls is the tallest waterfall on Earth measuring 108 meters at its highest point. How long will it take for a single drop of water to fall over its edge into the chasm below? Please check answer, if I am doing it incorrectly help me set it up. the last person who...
January 28, 2012

PHYSICS
The Victoria Falls is the tallest waterfall on Earth measuring 108 meters at its highest point. How long will it take for a single drop of water to fall over its edge into the chasm below?
January 27, 2012

english
I have a four page paper I have written for a scholarship. It is still in its rough draft. Would anyone be willing to proof read it?
January 26, 2012

Misc.
is there a site online that i can find it?
January 25, 2012

Misc.
How do you know what township you are in?
January 25, 2012

chemistry
treatment of a 0.3203g sample of impure soduim chloride with an excess of AgNo3 resulted in the formation of 0.7331g of AgCl. how many grams of sodium chloride were in the sample? What is the weight percentage of NaCl in the sample?
January 24, 2012

chemistry
treatment of a 0.3203g sample of impure soduim chloride with an excess of AgNo3 resulted in the formation of 0.7331g of AgCl. how many grams of sodium chloride were in the sample? What is the weight percentage of NaCl in the sample?
January 24, 2012

chemistry
treatment of a 0.3203g sample of impure soduim chloride with an excess of AgNo3 resulted in the formation of 0.7331g of AgCl. how many grams of sodium chloride were in the sample? What is the weight percentage of NaCl in the sample?
January 24, 2012

Literacy
Which Boolean operator limits your search so that each term input must be in the same document
January 21, 2012

Math
At the school store, colored pencils are reduced from $2.40 a box to $2.00 a box. What is the percent of decrease?
January 6, 2012

bio
thanks the peptidoglycan is pretty clear. but, do you think you could explain the difference between an exon and intron?? in more simple terms
January 5, 2012

bio
What are introns and exons? also what is a peptidoglycan( i hope i spelled that right)
January 5, 2012

science
hello! I need good sites that can help me with my physics class! do you have any ideas??
January 4, 2012

Physics
An airplane flies due north at 220 km/h with respect to the air. There is a wind blowing at 65 km/h to the northeast with respect to the ground. What are the plane's speed and direction with respect to the ground?
November 9, 2011

economics
Market demand is given as QD = 200 – 3P. Market supply is given as QS = 2P + 100. Each identical firm has MC = 0.5Q and ATC = 0.25Q. What is each firm’s profit?
November 3, 2011

economics
A monopolist faces market demand given by P = 200 – Q. For this market, MR = 200 – 2Q and MC = 3Q. What quantity of output will the monopolist produce in order to maximize profits?
November 3, 2011

geometry
what is the value of x , if one lenght is 16, and the other one is 23
October 17, 2011

Chemistry
How much energy (in kcal) is needed to convert 53.2 g of water at 55.0 C to steam at 100.0 C
October 4, 2011

Physics
Two teams are having a rope pulling contest. Team A is pulling with a force of 2400 N at 135 and team B is 1550 N at 315. What is the resultant force?
September 26, 2011

help please:)
the answer is c
September 25, 2011

Algebra
Thanks! That's what I thought
September 18, 2011

Algebra
Hello, I have been trying a few ways to do this problem and am not having success. The sum of four consecutive odd integers is -212. Write an expression for the second, third and fourth odd integers. Use these expressions to write, and solve an equation to find the four ...
September 18, 2011

professional communication
explain the importance of five sentence starters that you can use in a professional presentation?
August 24, 2011

physics
A car moves at a constant speed of 24m/s. How long (in minutes) will it take to travel 15.0 km?
August 10, 2011

physics
a ball is released from rest and rolls down a slope. It covers 7.5m in 12.4s. Find the average speed of the ball in m/s and km/hr.
August 10, 2011

physics
A distance runner moves at a constant pace of 4.1m/s. how far (in m) does he move in 30 minutes?
August 9, 2011

statistic
solve the problem :score a test are normally distributed with a mean of 68.2 and a standard deviation of 10.4 estimate the probablility that among 75 randomly selected students, at least 20 of them score greater than 78
July 21, 2011

College chemistry
is dispersion force the strongest IM for Cl2
July 1, 2011

Math
Part of 26000 invested at 4% interest and the rest at 2% interest yields 680.00
June 20, 2011

grammar
Although the abscess was incised and drained in the emergency room and cultures were obtained, which grew coag-positive staphylococcus.
June 15, 2011

grammar
5.After lengthy discussion, it was decided the patient would continue to be treated in the hospital. Is there any conjuction in this sentence.
June 15, 2011

life orientation
i dnt knw dat is y im asking plz help
May 13, 2011

Life orientation
Dnt knw them,i have choosen the topic of pollution.can u plz give me those answer
May 2, 2011

English Honors - Tale of Two Cities
Hello, I can't figure out the significance of the quote in Tale of Two Cities: "Drive him fast to his tomb". I know it signifies the beginning of the revolution but I'm not sure why.
April 3, 2011

physics
Two charged spheres are 8.00 apart. They are moved, and the force on each of them is found to have been tripled
March 4, 2011

Physics
A certain coiled wire with uneven windings has the property that to stretch it an amount s from its relaxed length requires a force that is given by , so its behavior is different from a normal spring. You suspend this device vertically, and its unstretched length is 19.0 cm. ...
February 25, 2011

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