Wednesday

April 1, 2015

April 1, 2015

Total # Posts: 670

**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*

**Finance**

7.90%
*April 21, 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*

**10th grade**

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) ¡ÂD¡Â (d) ¡ÂA ¡å D¡Â (e) B ¡ä ¡ÂC&...
*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*

**chemistry**

51.4
*December 15, 2009*

**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*

**Business**

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*

**business**

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*

**business**

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*

**5th Grade Math**

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*

**calculus**

Find the lim x->infinite (x/[3x+5]) where [] denotes the greatest integer function use the squeeze theorem.
*October 5, 2009*

**physics**

Really, no one?
*September 22, 2009*

**physics**

A 0.150 kg particle moves along an x axis according to x(t) = -13.00 + 2.00t + 3.50t2 - 2.50t3, with x in meters and t in seconds. In unit-vector notation, what is the net force acting on the particle at t = 3.45 s? I tried solving using s=Vit + (.5)at^2 but I can't find ...
*September 22, 2009*

**health**

please define: Emotional Health
*September 9, 2009*

**chemistry**

A sealed flask contains 0.40 g of water at 28 deg. celsius. The vapor pressure of water at this temperature is 28.36 mmHg
*September 6, 2009*

**Science (Physics)**

(a) What is the initial velocity of the green car? (b) What is the acceleration of the green car? Sorry I forgot to post the actual questions.
*September 3, 2009*

**Science (Physics)**

A red car and a green car, identical except for the color, move toward each other in adjacent lanes and parallel to an x axis. At time t = 0, the red car is at xr = 0 and the green car is at xg = 220 m. If the red car has a constant velocity of +20 km/h, the cars pass each ...
*September 3, 2009*

**French response to mathmate**

Here are the corrected answers to the first post. Thank you so much for all the help!! :)) 1. Quelle jupe plissée 2. Quel chemisier 3. Quel pull 4. Quelle paire de chaussures 5. Quel manteau 6. Quelle chemise à manches à longues 7. Quel jean 8. Quel anorak...
*September 2, 2009*

**World History RESPONSE to Writeacher**

The answers 1559 right??
*September 2, 2009*

**World History**

Could you help me with this question: What year did the act of Uniformity get put into effect?
*September 2, 2009*

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