Wednesday

May 6, 2015

May 6, 2015

Total # Posts: 2,203

**Probability **

From a box containing 7 blue, 5 red, 3 green, and 9 yellow marbles, 2 are drawn one at a time without replacing the first marble before the second marble is drawn. Find the probability that one is blue and one is yellow.
*May 2, 2012*

**Probability **

A pair of fair dice is tossed once. Find the probability a sum of 5 or 3 appears.
*May 2, 2012*

**physics**

a 1250 kg car, rolling at 40km/h along a flat frictionless surface strikes a horizontal coiled spring and is brought to rest in a distance of 2.5m. Assuming there is no friction, what is the spring constant of the spring?
*April 29, 2012*

**Life orientation**

ask your life orientation teacher,for more info
*April 28, 2012*

**Chemistry**

When 7 mL of a solution containing 4 M KNO3 is diluted to 23 mL, a dilute solution is formed. What is the NO3- concentration in 15 mL of the dilute solution?
*April 22, 2012*

**pre-calc**

simplfy the expression by double angle formula or a half angle formula. cos^2(x/2)-sin^2(x/2) 2sin(x/2)cos(x/2)
*April 22, 2012*

**Per-calc Helppppp**

find: tanx=-3 one period and all angles 3csc^2x=4 one period and all angles sin2x+cosx-0 one period
*April 19, 2012*

**Per-calc Helppppp**

keep in mind answers should be pi radians or if necessary 3 dec. csc^2-2=0 all angles 4cos^2x-4cosx+1=0 all angles and name 8 angles 7sin^2x-22sinx+3=0 all angles and name 8 angles 2cos^2x-7cosx=-3 all angles sinx(2sinx+1)=0 all angles
*April 19, 2012*

**Pre-Calc Help!!!!!!!!**

cos(2tan^-1(15/8))
*April 19, 2012*

**Pre-Calc Help!!!!!!!!**

1+sin2x/sin2x=1+1/2(secx)(cscx)
*April 19, 2012*

**Pre-Calc Help!!!!!!!!**

Evaluate the expression under the given conditions. sin (A+B); tan A= 12/5, A in quadrant 3, sin B= -3sqrt(10)/10, B in quadrant 4.
*April 19, 2012*

**English**

I have an test on these and I do not want to fall the test. Please tell me a ways I can study, online tests etc so that I can pass it. Thank you and I appreciate for your help! They are: They will be fill in the blanks, multiply choices. (1)Petroleum (2) Solar Energy resources...
*April 19, 2012*

**DrBob222**

Thank you sooooooooo much!!!!!!
*April 18, 2012*

**Chem-Help Please!!!**

a correction needs to be made to the calculations for real gases as compared to ideal gases. apply these corrections and calculate the real pressure expected for 5 mole of nitrogen in a 1.5L container at a temp. of 20C. Note: I tried to find right formula for this but couldnt...
*April 18, 2012*

**statistics**

The ages (in years) of 10 infants and the number of hours each slept in a day Age, x: 0.1, 0.2, 0.4, 0.7, 0.6, 0.9, 0.1, 0.2, 0.4, 0.9 Hours slept, y: 14.9, 14.5, 13.9, 14.1, 13.9, 13.7, 14.3, 13.9, 14.0, 14.1 Find the equation of the regression line. Then use the regression ...
*April 18, 2012*

**HISTORY PLEASE HELP!**

I had put b on my test and it was incorrect. A friend out e and got it right. Not sure why though sorry.
*April 17, 2012*

**Pre-Calc Help!!!!!!!!**

Evaluate the expression under the given conditions. sin2(theta), sin(theta)=1/7(theta) in Q2
*April 17, 2012*

**Pre-Calc Help!!!**

Find sin x/2, cos x/2, and tan x/2 from the given information. cos x=− 4/5, 180° < x < 270° sin(x/2= cos(x/2)= tan(x/2)=
*April 16, 2012*

**Pre-Calc Help!!!**

Simplify the expression by using a Double-Angle Formula or a Half-Angle Formula. Sqrt(1-cos50/2)
*April 16, 2012*

**child day care**

It's A
*April 13, 2012*

**Chemistry!!!!!!**

a compound is analysed and found to have the atomic composition of C 54.5454% H 9.0909 % o 36.3636%. at a temp. of 120C and a pressure of 608 mm the density is 2.183 g/L. what is its molecular formula.
*April 12, 2012*

**Chemistry!!!!!!**

a correction needs to be made to the calculations for real gases as compared to ideal gases. apply these corrections and calculate the real pressure expected for 5 mole of nitrogen in a 1.5L container at a temp. of 20C.
*April 12, 2012*

**Chemistry :((((**

a gas occupies a volume of 5L at a temp. of 20C and a pressure of 1atm. what volume would it occupy at a temp. of 30C and a pressure of 1.1 atm.
*April 12, 2012*

**trig**

solve the equation of the domain 0¡Ü¦È¡Ü2¦Ð 3cos^2theta - 5costheta -1 = 3sin^2theta
*April 9, 2012*

**Chemisty Help!!!!!!!!**

show how you would obtain (the orbitals used) and the possible types (the orbitals produced) for hybridization of a carbon atom. you must report the shape and the number of orbitals of each type used and produced for each type of hybridization.
*April 9, 2012*

**chemistry**

How many mL of 3% aqueous hydrogen peroxide solution can you make out of 100 mL of 35% aqueous hydrogen peroxide?
*April 8, 2012*

**chemistry**

How many mL of 3% aqueous hydrogen peroxide solution can you make out of 100 mL of 35% aqueous hydrogen peroxide?
*April 8, 2012*

**Finite Math**

In a carnival game, the player selects two coins from a bag containing four silver dollars and twelve slugs. (a) Write down the probability distribution for the winnings. (b) Determine how much the player would have to pay so that he would break even, on the average, over many...
*April 5, 2012*

**Finite Math**

An urn contains sixteen red balls and seventeen white balls. A sample of three balls is selected at random and the number of red balls observed. Determine the probability distribution for this experiment: Number of Red Balls/Probability 0...Probability=? 1...Probability=? 2......
*April 5, 2012*

**Statistics**

The ages (in years) of 10 infants and the number of hours each slept in a day Age, x: 0.1, 0.2, 0.4, 0.7, 0.6, 0.9, 0.1, 0.2, 0.4, 0.9 Hours slept, y: 14.9, 14.5, 13.9, 14.1, 13.9, 13.7, 14.3, 13.9, 14.0, 14.1 Find the equation of the regression line. Then use the regression ...
*April 4, 2012*

**Chemistry**

A calorimeter contains 22.0 mL of water at 14.0 C. When 2.50 g of X (a substance with a molar mass of 66.0 g/mol) is added, it dissolves via the reaction X(s)+H_2O(l)--------> X(aq) and the temperature of the solution increases to 25.5 C. Calculate the enthalpy change, ...
*April 2, 2012*

**Chemistry**

According to the following reaction, how much energy is evolved during the reaction of 32.5g B2H6 and 72.5g Cl2? The molar mass of B2H6 is 27.67g/mol. B2H6(g)+6Cl2(g)----->2BCl3(g)+HCl(g) Delta H reaction=-1396
*April 2, 2012*

**Microbiology**

Why can Enterotube II System be used to identify only gram-ngative, oxidase negative Enterobacteriaceae?
*March 28, 2012*

**Microbiology**

What organic molecule is necessary to detect mixed acid fermentation by bacteria? (IMViC Tests)
*March 27, 2012*

**Physics**

You like to swim at a nearby lake. On one side of the lake is a cliff, and the top of the cliff is 36m above the surface of the lake. You dive off the cliff doing somersaults so as to have an angular speed of 6rev/min. How many revolutions do you make before you hit the water...
*March 27, 2012*

**English**

Ok so i understand exository but can you please simplify literary for me
*March 25, 2012*

**English**

Ok so expository gives you a topic right
*March 25, 2012*

**English**

I have starr test in the morning can somebody please explain what the difference between literary and expository writing
*March 25, 2012*

**reading **

describ the settings of the text physically and socially and historically. fron the book the red scarf girl
*March 25, 2012*

**Chemistry**

How many mL of 5.5 M KOH are needed to prepare 300 mL of 0.2 M KOH?
*March 25, 2012*

**Chemistry**

How do you prepare a 0.4 M soultion of copper sulfate in water starting with solid copper sulfate and water?
*March 25, 2012*

**Chemistry**

I don't get this at all. A beaker with 105mL of an acetic acid buffer with a pH of 5.00 is sitting on a bench top. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 8.40 mL of a 0.470 M HCl solution to the beaker. How much will the pH ...
*March 25, 2012*

**SCI207: Dependence of Man on the Environment**

Give specific examples of at least two (2) production and two (2) consumption habits humans have related to material resources.
*March 24, 2012*

**Economics**

The market demand in a Bertrand duopoly is P = 15 - 4Q, and the marginal costs are $3. Fixed costs are zero for both firms. Which of the following statement(s) is/are true? a.P = $3. b.P = $10. c. P = $15. d. None of the statements associated with this question are correct. I...
*March 21, 2012*

**algebra 2**

the area of a square is numerically 165 more than the perimeter. find the length of the side
*March 18, 2012*

**algebra 2**

the height of a box is 6 inches. the length is three inches more than the width. find the width if the volume is 240 cubic inches
*March 18, 2012*

**algebra 2**

two cars leave an intersection. one car travels north; the other east. when the car traveling north had gone 15 miles, the distance between the cars was 5 mile more than the distance traveled by the car heading east.how far had the east bound car traveled?
*March 18, 2012*

**algebra 2**

a ladder is resting against a wall. the top of the ladder touches the wall at a height of 6 feet. find the length of the ladder if the lenght is 2 feet more than its distance from the wall.
*March 18, 2012*

**algebra 2**

the printed matter on a 10 by 16 centimeter page of a book must cover 0 square centinmeters. if all margins are to be the sme width, how wide should they be?
*March 18, 2012*

**algebra 2**

a triangluar garden has an area of 189 square feet. its height os 3 feet more than ots base. find the measure of the base.
*March 18, 2012*

**Finite Math**

help me this is the one problem I just cannot seem to figure out!! Without consultation, each of five organizations announces a one-day convention to be held during July. Find the probability that at least two organizations specify the same day for their convention.
*March 16, 2012*

**Finite Math**

i want help understanding how to solve the problems, not just the answers. I understand how to get the denominator, by getting the total and nCr the sample, but i cannot figure out the numerator when it comes to solving these probability problems.
*March 15, 2012*

**Finite Math**

A law firm has thirteen senior and nine junior partners. A committee of 6 partners is selected at random to represent the firm at a conference. What is the probability that at least one of the junior partners is on the committee?
*March 15, 2012*

**Finite Math**

Without consultation, each of five organizations announces a one-day convention to be held during July. Find the probability that at least two organizations specify the same day for their convention.
*March 15, 2012*

**Finite Math**

C (14,8) = 3003 C (26,8) = 1562275 1562275 - 3003 = 1559272 ANSWER= 1559272/1562275 (cannot be simplified)
*March 15, 2012*

**Finite Math**

A factory produces fuses, which are packaged in boxes of 26. Eight fuses are selected at random from each box for inspection. The box is rejected if at least one of these eight fuses is defective. What is the probability that a box containing twelve defective fuses will be ...
*March 15, 2012*

**Finite Math**

Eight white socks and four red socks are in a drawer. If two socks are selected at random, what is the probability that both socks are the same color?
*March 15, 2012*

**algebra 2**

Factor the difference of two cubes: 5x^4y^2-40xy^5
*March 15, 2012*

**Finite Math**

An urn contains six red balls and five white balls. A sample of 2 balls is selected at random from the urn. What is the probability that at least one of the balls is red?
*March 15, 2012*

**Programming**

Write a program (pseudocode) that would calculate and display the results for the multiplication table for values ranging from 1 to 100. This what I have so far: Declare X, Y, Z As Integer Write “10 x 10 Multiplication Table” For (X = 1; X<=10; X++) For (Y = 1; Y&...
*March 11, 2012*

**Chemistry**

How many mL of 5.5 M KOH are needed to prepare 300 mL of 1.2 M NaOH?
*March 11, 2012*

**chemistry**

How do you prepare a 0.4 M solution of sulfuric acid in water starting with concentrated sulfuric acid (18 M) and water?
*March 11, 2012*

**chemistry**

How do you prepare a 0.4 M solution of sulfuric acid in water starting with concentrated sulfuric acid (18 M) and water?
*March 11, 2012*

**English**

no seprate sentence
*March 5, 2012*

**English**

Sentence with: Locomotive revolting caricaturist contraband
*March 5, 2012*

**1**

What is intensity
*March 4, 2012*

**HELPPPP ! -.-**

EARTH SCIENCE ; NOBODY WANT TO HELP ME -.-
*March 2, 2012*

**HELPPPP ! -.-**

Describe how the principle of superposition was used in determining the relative ages of the cross-sections?
*March 2, 2012*

**Science**

Describe how the principle of superposition was used in determining the relative ages of the cross-sections?
*March 2, 2012*

**Earth Science **

Describe how the principle of superposition was used in determining the relative ages of the cross-sections?
*March 2, 2012*

**Math**

you need to use the Fisher formula to find the real interest rate 1+R=(1+r)x(1+h) where R=11%nominal rate h=3.8%inflation and r= the real interest rate 1+.11=(1+r)x(1+.038) r=6.94% =I/Y N=40 PV=0 FV=1.5million PMT=7630.72
*February 29, 2012*

**math**

if jhonny got a raise from 4$ to$4.60 what is the precentage of increase for one hour
*February 28, 2012*

**Physics**

Calculate the net charge on a substance con- sisting of a combination of 7.2 × 1013 protons and 4.8 × 1013 electrons. Answer in units of C
*February 28, 2012*

**algebra 1**

(w^3-57w+43) / (w+8)
*February 24, 2012*

**business**

I feel like it would be - C. focus exlusively on the initial salary rather than on benefits or furture opportunities. D. name a specific salary and be firm in the fact that you could accept no less.
*February 22, 2012*

**Math**

k/5+3/20<3/10 Please help me solve this and show your work please and thank you
*February 22, 2012*

**Math**

Simplify each expression. Write answers using positive exponents. a. (7x^2y^3)(-2xy) b. (a^2b^3)^-1(a^2b^3) c.(-4m^3)^2
*February 22, 2012*

**Math**

a. -14x^3y^4 ??
*February 22, 2012*

**Math**

c. -16m^6
*February 22, 2012*

**Math**

Simplify each expression. Write answers using positive exponents. a. (7x^2y^3)(-2xy) b. (a^2b^3)^-1(a^2b^3) c.(-4m^3)^2
*February 22, 2012*

**Math**

Simplify each expression. Write answers in standard form. a. (4d-6)(-3d) b. 5g(g^2-2g+1) c. (-2q^2+q+3)-5(q^2+2q-1)
*February 22, 2012*

**business**

From what I read, I believe the answer is C.
*February 21, 2012*

**Math**

A bottle contains at least 4 times as much juice as a glass contains. The bottle contains 32 fluid ounces. Write an inequality that shows this relationship. Please help me show your work please and thank you
*February 21, 2012*

**Chemistry**

How much 12 M HCl do you add to 1 L of water to obtain 0.2 HCl? Use this same approach to do the math for the dilution of 5.5 M of barium hydroxide solution to 0.5 M barium hydroxide solution.
*February 19, 2012*

**Chemistry**

How much 12 M HCl do you add to 1 L of water to obtain 0.2 HCl? Use this same approach to do the math for the dilution of 5.5 M of barium hydroxide solution to 0.5 M barium hydroxide solution.
*February 19, 2012*

**vocabulary**

A. denotative B. connotative
*February 18, 2012*

**Algebra 1**

simplify the expression: (y+5)^3
*February 17, 2012*

**Criminal Justice**

Suicide is the _____ leading causes of death in the US and the ______ leading cause of people between the ages of 15-34.
*February 16, 2012*

**Chemistry**

How much carbon dioxide has to be bubbled into aqueous sodium hydroxide to obtain a solution containing 3.5 mol of sodium hydrogen carbonate?
*February 12, 2012*

**Chemistry**

You dissolve 5 g of calcium hydroxide in 2 liters of water. What is the molarity of the hydroxide ions in this solution? What is the molarity of the calcium ions in this solution?
*February 12, 2012*

**Chemistry**

How much 0.5 M HCl is needed to neutralize 5.5 kg of ammonia dissolved in 6 gal of water?
*February 11, 2012*

**business english**

I believe it's B. When I tried it in my spell Checker it only underlined ''recieved"
*February 9, 2012*

**Algebra**

SOMEONE PLEASE ANSWER MY QUESTION
*February 9, 2012*

**Algebra**

An airplane takes off from an airport at 7:00 a.m. traveling at a rate of 350 mi/h. Two hours later, a jet takes off from the same airport following the same flight pattern at 490 mi/h. How long would it take for the two planes to meet each other?
*February 9, 2012*

**business english**

I think 19 is B. When you check any of these under spellcheck - as a tip from another post with this same question, it only underlines "recieved" therefore, a spell checker would catch that as an error because its the only word actually spelled incorrectly.
*February 8, 2012*

**Physics**

A nurse counts 76 heartbeats in one minute. What are the period and frequency of the heart's oscillations?
*February 8, 2012*

**chemistry**

what is the mass in grams of 0.0850 mol of hydrogen atoms?
*February 7, 2012*

**physics**

a speaker at a concert generates 1 x 10^-2 w/m^2 at a distance of 20m form the speaker at a frequency of 1kHz 1) calculate the wavelength of the waves emitted. b) what is the intensity level at 20m
*February 7, 2012*

**physics**

A shot putter projects the shot at an angle of 37 degrees above horizontal with a force of 980 Newtons (N). What are the magnitudes of the vertical and horizontal components of the 980 N force?
*February 6, 2012*

**UofP**

4(x-6)+6=6(x+2)-10
*February 4, 2012*