Thursday
December 8, 2016

# Posts by JEFF

Total # Posts: 787

statistics
which of the following statements are correct? a. a normal distribuiton is any distribution that is not unusual. b. the graph of a normal distribution is bell-shaped. c. if a population has a normal distribution, the mean and the median are not equal. d. the graph of a normal ...
August 16, 2010

statistics
indicate whether the given statement could apply to a data set consisting of 1,000 vlaues that are all differnt. a. the 29th percentile is greater thatn the 30th percentile b. the median is greater thatn the first quartile c. the third quartile is greater than the first ...
August 13, 2010

The area of a circle is 28.26 square centimeters. What is its diameter (use 3.14 for ð)?
July 20, 2010

physics
A big yo-yo(radius .2m, mass 20kg) has a string wrapped about its circumference. If yo-yo falls, how far does it fall in 2 seconds? (The yo-yo is shaped like a disk)
June 29, 2010

chemistry
100 million automobiles contains 1.1 kg of CFC-12 and leaks 25% of its CFC-12(CF2Cl2) into the atmosphere per year, how much Chlorine in kilograms is added to the atmosphere each year due to auto air conditioners?
June 28, 2010

economics
By 2008 the US trade deficit was still very large (roughly 5% of gross income) and our net debt position was around \$5 trillion (over 1/3 of gross income). Unfortunately, it also appears that we have fallen into a major recession of uncertain duration and depth. Discuss the ...
June 23, 2010

Accounting
Imagine you have been selected by your manager to present a training session to a group of new employees. The new hires do not have accounting backgrounds and have little or no work history in a responsibility center. The purpose of this training session is to explain the ...
June 7, 2010

Physics
A hunter aims directly at a target (on the same level) 125m away. If the bullet leaves the gun at a speed of 227 m/s, by how much will it miss the target? I'm not sure how to approach this problem. I know I need to find the horizontal distance traveled, probably by finding...
June 3, 2010

Algebra 2
I meant to type this one: If the sine of an acute angle is 0.8, what is the sine of twice that angle? 1.60 or .64? Thanks
May 28, 2010

Algebra2
I got it, .5
May 28, 2010

Algebra2
Help How do I figure out: (cos 40)(cos20) - (sin 40)(Sin 20) Thank you
May 28, 2010

Right Hand Rule
a) west b) zero deflection c) up d) down
May 21, 2010

algebra 2
I am taking an online class, and cant understand why when I calculate ona ti84 plus an answer I get decimal answer and my teachers answer is sq root, is there something I am not doing on my calculator? How do I convert. Example, teachers answer to the following was sin 315deg...
May 16, 2010

algebra2
Example, teachers answer to the following was sin 315deg = -sin 45deg = -sqrt2/2 I got a decimal answer.
May 15, 2010

algebra2
I am taking an online class, and cant understand why when I calculate ona ti84 plus an answer I get decimal answer and my teachers answer is sq root, is there something I am not doing on my calculator? How do I convert.
May 15, 2010

Chemistry
902 mL
May 15, 2010

statistics
The first class in a relative frequency table is 50–59 and the corresponding relative frequency is 0.2. What does the 0.2 value indicate?
May 14, 2010

Science
what is the relative location of the marine biome, specifically the ice cap biome?
May 13, 2010

chemistry
6) How many grams of copper (II) fluoride, CuF2, are needed to make 6.7 liters of a 1.2 M solution?
May 11, 2010

calculus
sum_(n=-1)^infinity(-1)^(n+1) (1/3)^n = 9/4~~2.25... How do you find that out? Is there a formula?
April 27, 2010

chemistry
Write a net equation for the reaction between aqueous solutions of HBr and NH3.
April 26, 2010

math
Evaluate f(x)= 4x^2 - 2 for f(1/2)
April 19, 2010

managerial economics
a) Given total cost function as C=160+16Q+0.1Q(2){squared} and price equation P=96-0.4Q. Total Revenue function is R=PQ=96Q-0.4Q(2). The profit function is F=R-C=(96Q-0.4Q(2))-(160+16Q+0.1Q(2))=80Q-0.5Q(2)-160. Profit attains maximum when and is negative dF/dQ=0 and d(2)F/dQ(2...
April 11, 2010

chemistry
How many grams of oxygen are required to react with 0.128 lead(II) sulfide?
April 8, 2010

algebra
x – 2y = 6
April 8, 2010

Chemistry
This question is: How many orbitals are there in each of the following energy levels.. a) 1s b) 6p c) 10f d) 7d e) 5s Now.. do i use n^2 for the number of orbitals in each energy level? Ex. b) would be 36 OR can i state the number of orbitals in each sublevel using the shape? ...
April 4, 2010

Chemistry
Why do atoms display spectra?
April 3, 2010

chemistry
how did you get that?
March 21, 2010

Calculus
An isosceles triangle has a vertex at the origin. Determine the area of the largest such triangle that is bound by the function x^2 + 6y = 48. So, y=8 when x=0 making a vertical side equal to 8. I also determined that there is a zero at =/- the square root of 48, or ...
March 20, 2010

Calculus
The radius of a tank can not exceed 5m, and the height can not exceed 12 m. Is it possible to construct a tank with a volume of 900m^3? If it is possible, determine the minimum amount of material required to make the tank. When i solve it, the radius exceeds the restrictions...
March 19, 2010

physics
Evidence suggests that there are trillions of dollars' worth of minerals and metals buried in Near Earth Asteroids (the ones that come close to the Earth, not the ones in the asteroid belt between Mars and Jupiter). Many scientists think an asteroid mining mission is ...
March 18, 2010

Chemistry
I've been asked to find the IUPAC name for polyvinyl acetate. when i type it in google i keep getting butan-2-yl acetate. but isn't the IUPAC name for acetate ethanoate ..? so would the proper IUPAC name for PVA be butan-2-yl ethanoate?
March 9, 2010

Physics
What is the equation for work?
March 9, 2010

Middle school Math
Graph 3y-4=11 by finding intercept(s) How do you do this... Thanks
March 6, 2010

Math
Stop cheating. gtfo. (Like Kevin, there is no doubt in my mind that you will be victorious.)
March 6, 2010

Chemistry
I'm doing an intro to organic chem, and i'm looking at the functional groups of organic compounds. More specifically, I am looking at melting/boiling points. I keep reading that one has a greater m/b pt. than another, but another one has a greater m/b pt. that one but ...
March 6, 2010

French
I need help with grammar, can someone check it out for me? 1. Une valeur mobilière est un fongibles, un instrument négociable représentant une valeur financière. Les deux types de valeurs mobilières sont les actions et les obligations. 2. Une...
March 3, 2010

electric potential
Given a square of side length a = 6 cm. We place a charged particle at each corner, three of them carry +7 nC of charge and one carries the same amount of negative charge. What is the electric potential at the center of the square? Choose V = 0 V for a position very far from ...
February 24, 2010

Chemistry
What are the products when you add water to 2-methyl-2-pentene?
February 15, 2010

calculus
dh/dx x = 7 , h (x) = (x^-1/2 + 8x)(4 - x^-1)
February 8, 2010

Personal Finance
The Lees, a family of two adults and two dependent children under age 16, had a gross annual income of \$68,000 for 2007. Determine their standard deductions, exemption, and child tax credit amounts, as well as their marginal and average tax rates assuming their filing status ...
January 28, 2010

I need to unscramble the letters to this word from the renaissance. The letters are NWIHZGLCIRULI
January 27, 2010

science
An athlete throws a basketball through a hoop. The ball leaves his hands at a height of 2.5 m with a speed of 9.0 m/s. Calculate the speed of the ball when it “swishes” through the hoop. The hoop is at a height of 3.0 m and it is 5.0 m along the court from the ...
January 22, 2010

Math
Yes. X=2-2t y=3t
January 18, 2010

Physics
Two events that are simultaneous in one frame of reference will be: A) simultaneous in all frames of reference B) simultaneous in another frame that is moving in the opposite direction C) simultaneous in another frame of reference that is moving in the same direction D) ...
January 12, 2010

Math
If the digits 1 through 9 are written in order, it is possible to place plus and minus signs between the numbers or to use no operation symbol at all to obtain a total of 100. For example,1 + 2 + 3 + -4 + 5 + 6 + 78 + 9 = 100 Can you obtain a total of 100 using fewer plus or ...
January 11, 2010

Algebra
Let U = {u, n, i, t, e} A = {n, i, t} B = {n, e} C = {u, n, i, t, e} D = {u, e} Find each of the following: (a) A ¡ä B (b) C ¡å D (c) ¡D¡ (d) ¡A ¡å D¡ (e) B ¡ä ¡C¡ (f) (B ¡ä C) ¡...
January 11, 2010

Algebra
Given the following function rules and domains, find the associated ranges. (a) f(x) = 2x +3, Domain = {0, 1, 2} (b) f(x) = 0, Domain = {0, 1, 2} (c) f(x) = 2x + x2, Domain = {1, 0, 2}
January 11, 2010

statistics
Question 1 Question 1 1. Question 1 text The head of the History Department wants to compare the averages of 2 different instructorâ€™s to see if they differ. A sample of 15 students in Instructor Aâ€™s class has average of 74 with a standard ...
January 9, 2010

math
estimate 4/5of 49
January 6, 2010

math
6/11x32 by using estimating product
January 6, 2010

math
2/3x35 by using estimating product
January 6, 2010

math
3/4x35 by using estimating product
January 6, 2010

math
7/8x30 by using estimating product
January 6, 2010

math
5/8x41 by using estimating product
January 6, 2010

math
2/9x26 by using estimating product
January 6, 2010

math
2/9x26 by using estimating product
January 6, 2010

math
3/7x29 by using estimating product
January 6, 2010

math
1/2x17 by using estimating product
January 6, 2010

math
1/5x26 by using estimating product
January 6, 2010

math
3/8x17 by using estimating product
January 6, 2010

math
5/8x19 by using estimating product
January 6, 2010

math
4/7x20 by using estimating product
January 6, 2010

math
what is 1/5x24 by using estimating product
January 6, 2010

math
Find the mean of the following set of numbers.7, 10, 9, 13, 6
December 13, 2009

math
hockey teams receive 2 points for every game won and i point for every tie. One year a team won a championship with 66 points. They won 12 more games than they tied, how many wins and how many ties did the team receive?
December 11, 2009

Science
You are floating motionless in outer space. Your mass is 70 kg. Your 70 kg transporter floats by and you attempt to bring in closer by flexing your right arm. Are you more likely to produce an isotonic or isometric contraction? Explain.
December 10, 2009

Science
You are floating motionless in outer space. Your mass is 70 kg. Your 70 kg transporter floats by and you attempt to bring in closer by flexing your right arm. Are you more likely to produce an isotonic or isometric contraction? Explain.
December 10, 2009

physics
1100g of ice at -50C is mixed with 100g of steam at 120C. Find out how much ice melts? The implied final temperature is 0C. Cice=0.5 Csteam=0.46 Hv=539 Hf =80 here is my work 1100(0.5)(0+50)+80m = 100(0.46)(120-0)+540(100) i am not getting the right answer
December 5, 2009

math
write an equation of the line containing the given point and parallel to the given line (-2,3)2x=7y+9
December 5, 2009

FINANCE
Collins Office Supplies is considering a more liberal credit policy to increase sales, but expects that 9 percent of the new accounts will be uncollectible. Collection costs are 5 percent of new sales, production and selling costs are 78 percent, and accounts receivable ...
December 3, 2009

College Math
Write the Unit price for the following item. \$5.16 for a dozen oranges?
November 28, 2009

chemistry
At atmospheric pressure, a sample of O2 gas has a volume of 55mL at 27 degrees celcius. What volume in mL will the O2 gas occupy if the temperature is decreased 0 degrees C and the pressure is held constant?
November 24, 2009

programming
I got the the LineScrabble class: import java.io.*; public class LineScrabble extends Echo{ int max = 0; String bestLine = ""; public LineScrabble(String f) throws IOException { super(f); } int[] scrabbles = {1,3,3,2,1,4,2,4,1,8,5,1,3,1,1,3,10,1,1,1,1,4,4,8,4,10}; ...
November 24, 2009

programming
Can anyone help me with this really confusing programming problem? The board game scrabble works by assigning points to wooden tiles arranged in cells on a board. We'll simplify this considerably, and consider the following question. We begin with the letter-scoring scheme...
November 24, 2009

physics
A children's merry-go-round in a park consists of a uniform 200kg disk rotating about a vertical axis. the radius of the disk is 6 m and a 100kg man is standing on the outer edge when the disk is rotating at a speed of 0.20rev/s. how fast will the disk be rotating if the ...
November 21, 2009

physics
a uniform disk and a uniform sphere are rolled down an incline plane from the same point and intially they are at rest. Find the difference in time they arrive at a mark on the plane which is 6 meters from the starting point. The sphere has twice the mass and the same radius ...
November 21, 2009

physics
a uniform disk and a uniform sphere are rolled down an incline plane from the same point and intially they are at rest. Find the difference in time they arrive at a mark on the plane which is 6 meters from the starting point. The sphere has twice the mass and the same radius ...
November 21, 2009

AP Physics B
The college board website only has exams from 1999 to last years. Some how my teach has gotten ahold of the free response questions from like 1980 and he said that they are open to the public and can be found on the internet. I can't seem to find were they are all the ...
November 17, 2009

PreCalculus
why is -sin(380)/cos (380) equal to -tan(200) I don't see how it's 200 wouldn't it be -tan 380
November 15, 2009

calculus
calculate the lim as x-> pi (cos(x)+1)/(x-pi) using the special limit lim x->0 sinx/x
November 13, 2009

Using the financial statements for the Goodyear Calendar Company, calculate the 13 basic ratios found in the chapter. GOODYEAR CALENDAR COMPANY Balance Sheet December 31, 2008 Assets Current assets: Cash...
November 9, 2009

Using the financial statements for the Goodyear Calendar Company, calculate the 13 basic ratios found in the chapter. December 31, 2008 Assets Current assets: Cash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \$ 40,000 Marketable ...
November 9, 2009

Using the financial statements for the Goodyear Calendar Company, calculate the 13 basic ratios found in the chapter.
November 9, 2009

calculus
If you plug in x=1, you find that f(x)=4x^3-36x^2+96x-64 evaluates to zero. From here, use either synthetic division or long division to get the quadratic 4x^2-32x+64. Reduce to x^2-8x+16 and solve by factoring into (x-4)^2. So 4x^3-36x^2+96x-64=4(x-1)(x-4)^2.
November 9, 2009

I found the same problem in my son's math homework when he learned LCM. That's maybe why my son used LCM to solve it. I used similar way to Reiny's. i.e. Nick's speed: 1/8. Isah's speed : 1/10. When Nick passed Isah for the second time, Nick will run 1 more...
November 5, 2009

Organic chem
Oxymercuration/reduction? Not sure anymore...
November 4, 2009

chemistry
What is the hamiltonian for a Lithium atom?
November 3, 2009

chenistry
State whether each of these functions is symmetric, antisymmetric, or neither, with respect to the interchange of coordinates 1 and 2: (a) g(1)f(2) b)(r1-r2)e^-br12 where r1 and r2 are vectors describing positions of two points and r12 is the distance between them |r1-r2|
November 3, 2009

chemistry
Calculate the angle which the spin angular momentum of a single electron forms with the z axis in alpha and beta spin states. What are the possible angles of the spin angular momentum for a two-electron triplet state
November 3, 2009

Physics
Does blue light or orange light have a larger index of refraction? Blue light is bent more by a prism than orange light. Does blue light or orange light have a larger index of refraction in glass? A. Blue B. Orange If you know the answer to this, could you also explain why? ...
October 29, 2009

math
i am a number between 7 000 000 and 8 000 000 all my digits are odd all the digits in my thousands period are the same all the digits in my units period are the same the sum of my digits is 31 what number am i ?
October 27, 2009

calculus
A flag pole is 40 feet high and stands on level ground. a flag is attached to a 120 foot rope passing through a pulley at the top of the flagpole. The other end of the rope is tied to a car at ground level. If car was driving directly away from flagpole at 3ft/sec, how fast is...
October 26, 2009

College Physics
Yes I know of using that equation but the acceleration is not constant so I can't just plug in into an equation with a different x value.
October 25, 2009

College Physics
The only force acting on a 3.9 kg body as it moves along the positive x axis has an x component Fx = - 6x N, where x is in meters. The velocity of the body at x = 3.0 m is 8.0 m/s. (a) What is the velocity of the body at x = 4.0 m? (b) At what positive value of x will the body...
October 25, 2009

Algebra
the lenght of a rectangle is fixed at 19 cm. What width will make perimeter greater than 70 cm?
October 13, 2009

college physics
In the figure below, two point particles are fixed on an x axis separated by a distance d. Particle A has mass mA and particle B has mass 2.00mA. A third particle C, of mass 90.0mA, is to be placed on the x axis and near particles A and B. In terms of distance d, at what x ...
October 11, 2009

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