Friday

January 30, 2015

January 30, 2015

Total # Posts: 446

**Math**

Find a way to estimate the time to flip a coin 10,000 times; 100,000 times.
*January 23, 2015*

**Math**

Hi! Can someone help me with these? I'm suppose to verify each idenity. Thanks! 1.) 1/tanθ +tanθ=sec^2θ/tanθ 2.) secθ-1/1-cosθ=secθ
*January 19, 2015*

**Math- Geometry**

Given: Angle ABC is a right triangle with hypotenus AB D,E and F are midpts of the sides of the triangle Proof: a. CDEF is a rectangle b. EC is half of AB
*December 11, 2014*

**Chemistry**

Balance the following equation in basic conditions CoCl2 (s) +Na2O2 (ag) ----> Co(OH)3 (ag)+Cl- (ag) + Na+ (ag)
*November 21, 2014*

**Chemistry**

I keep getting Mno2+4oh-+3fe3+ ->mno4-+3fe2++2h2o but it is saying incorrect
*November 21, 2014*

**Chemistry **

in a particular redox reaction, MnO2 is oxidized to MnO4– and fe3+ is reduced to fe2+. Complete and balance the equation for this reaction in acidic solution. Phases are optional.
*November 21, 2014*

**Chemistry**

How do you balance, step by step C2H5OH + K2Cr2O7 + H2SO4 = Cr2(SO4)3 + K2SO4 + CH3COOH + H2O?
*November 11, 2014*

**Chemistry**

step by step, show how to balance C2H5OH + K2Cr2O7 + H2SO4 = Cr2(SO4)3 + K2SO4 + CH3COOH + H2O
*November 11, 2014*

**Math Help**

The New York Times study of homes reported average house size in 2001 to be 2,428 square feet, compared with an average of 2,150 square feet in 1987. Suppose a study of homes over the years recorded the year from 1987 to the present, as well as the size of the house in square ...
*November 4, 2014*

**Math Help **

I really need help on this. I tried doing it on my own, but, I got stuck. Thanks! (a) List any approximate x-intercepts values. (b) Set y = 0 and solve the resulting equation; y=x^3-4x^2-25x+100.
*October 10, 2014*

**finance**

1.Bill and Warren are thinking about issuing 11 percent coupon bonds that will mature in 15 years. Market interest rates are 13 percent. What could they sell each of the bonds for?
*October 7, 2014*

**Pre-Calc**

Describe the difference between transformations and nonrigid transformations.
*September 26, 2014*

**Pre-Calc Help!**

@Mia, did I do this write? x^2-8x+15 (x + 3) (x + 5) x-5=0 x-3=0 The zeros would be x = 3 x = 5
*September 19, 2014*

**Pre-Calc Help!**

I really need help with this question. Thanks! Find the zeros of the function algebraically. Be sure to show all work. f(x)=x^2-8x+15 --------------- 10x
*September 19, 2014*

**Pre-Calc**

Find the zeros of the function algebraically. Show all work. f(x)=x^2-8x+15 ---------------- 10x
*September 18, 2014*

**science**

Mary is driving on a straight road. Suddenly a deer jumps out in front of her. Mary turns her car to the left to avoid the deer. Which best describes what happens to mary's head position if she is wearing her seatbelt? A) mary's head moves to the left b marys head ...
*August 27, 2014*

**Math**

390
*August 27, 2014*

**Chemistry**

if you dissolve 25.5 g of KBr in enough water to make 1.75 L of solution, what is the molarity of the solution
*May 13, 2014*

**Biology**

Describe how a monomer is the basic unit of all macromolecules.
*April 28, 2014*

**financial management**

A capital project has an initial investment of $100,000 and cash flows in years 1-6 of $25,000, $10,000, $50,000, $10,000, $10,000, and $60,000, respectively. Given a 15 percent cost of capital, •(a) compute the net present value. . •(b) compute the internal rate of...
*April 14, 2014*

**financial management**

2. If you have an opportunity cost of 10%, how much should you be willing to invest now to have $8,000 accumulated in 10 years?
*April 12, 2014*

**analytical chemistry**

Could someone please clarify. I recently sent this question to the forum and thought I had it figured out. Now another student has told me to do this: 35.7 ppm x 250ml = 8.925 x 10-3 g 8.925 x 10-3 g/4.272g=2.089 x 10-3 = 2089 x 10-6 = 2089ppm Please help I do not know what is...
*March 5, 2014*

**analytical chemistry**

Thanks so much. You are correct the answer should read 178.5 ppm.
*March 5, 2014*

**analytical chemistry**

Suppose a 4.272 g soil sample undergoes an extraction with 50 ml of extracting solvent to remove the lead. This 50 ml was then diluted to 250 ml and tested by atomic absorption technique. The concentration of lead in this diluted extract was found to be 35.7 ppm. What is the ...
*March 5, 2014*

**Algebra 2 Help!**

For number 4 would the answer be "1 real"? Cause the options were 1 real, 2 real, or 2 complex.
*February 28, 2014*

**Algebra 2 Help!**

1.) Simplify the expression. [sqrt3 + 2i][sqrt3 - 2i] 2.) Solve using the square root property. (y - 4)2 = -18 3.) Rewrite the the function in vertex form. You may use completing the square or an alternate method. f(x) = 5x2 - 10x + 3 4.) Use the Discriminant b2 - 4ac to ...
*February 28, 2014*

**math**

If you divide 3 oranges amongst 4 friends how much does each person get?
*February 12, 2014*

**Analytical chemistry**

How many grams of solid CuSO4. 5H2O are needed to prepare a 500 ml of a 1000 ppm solution of Cu?
*February 2, 2014*

**Fundamentals of Finance**

I've posted 2 different questions on the above mentioned and no one has helped with the questions, or if it was than how to I go about finding them. HELP! I'm so lost here!
*January 15, 2014*

**Fundamentals of finance**

"Genatron wants to estimate what will happen to its income before interest and taxes if its net sales change from the 2012 level of $1,500,000. Refer to Genatron’s 2012 income statement below, where the income before interest and taxes is $247,000 (EBT of $190,000 ...
*January 12, 2014*

**Fundamentals of finance**

"Estimate the weights (wi) for assets in the three portfolios given the following information about the portfolio holdings: " Price Number of securities Market value Portfolio weights Percentages to one decimal place a. Stock A $25 200 500 0.22522523 22.50% Stock B...
*January 12, 2014*

**Statistic**

Consider a football team for whom the numbers on the active players’ jerseys are 29, 41, 50, 58, 79,…, 10 (listed in alphabetical order of the players’ names). Does it make sense to calculate the mean of those numbers? Why or why not? 2. The Fair Isaac ...
*January 11, 2014*

**analytical chemistry**

Regarding ICP analysis 4. For each of the following electrical discharge sources list the major strengths and limitations: a. dc arcs, b. ac arcs, c. ac sparks.
*December 27, 2013*

**Math Help!**

Determine whether the relation is a function. {(4, 9), (-4, 9), (2, 3), (10, -5)}
*November 27, 2013*

**math**

[(-15)(-7)divided by (2-17)=
*November 18, 2013*

**maths**

I would really appreciate it if someone could answer this ASAP!
*November 16, 2013*

**maths**

What do they mean by using the equation about to show you found your answer?
*November 16, 2013*

**Maths**

Going off of the question I asked: How many miles, m, will each of the cars have on them when the numbers of weeks, w, is the same? Use the equation from Problem 2 Part A (the one above). Show how you found your answer. Thank you!!!!!
*November 16, 2013*

**math**

Please help!
*November 16, 2013*

**math**

This homework question was removed due to a copyright claim submitted by the National Network of Digital Schools Management Foundation (NNDS).
*November 16, 2013*

**Math**

Fill in the blank so that the numbers are evenly spaced. 101, _____, _____,1001
*November 12, 2013*

**5th grade math parent**

Fill in the blank so the numbers are evenly spaced. 101, _____, _____, 1001?
*November 12, 2013*

**BCIT**

A series of standard solutions of benzene in toluene solvent is to be prepared for an internal standard procedure with ethylbenzene serving as the internal standard. Tell how you would prepare the solutions, including the milliliters of benzene concentrations are to be 0.5%, 1...
*November 10, 2013*

**Chemistry**

A 0.110-L sample of an unknown HNO3 solution required 52.1 mL of 0.150 M Ba(OH)2 for complete neutralization. What was the concentration of the HNO3 solution?
*November 9, 2013*

**chemistry**

For the following chemical reaction write the net ionic equation, including the phases. 2HBr (aq) +Ba(OH)2(aq) --> 2H2O(l) +BaBr2 (aq)
*November 9, 2013*

**physics**

A light spring having a force constant of 130N/m is used to pull a 7.50kg sled on a horizontal frictionless ice rink. The sled has an acceleration of 2.50m/s^2? Part A: By how much does the spring stretch if it pulls on the sled horizontally? X=0.144m Part B: By how much does ...
*September 26, 2013*

**Chemistry**

When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced. CaCO3 +2HCl yields CaCl2 +H2O +CO2 How many grams of calcium chloride will be produced when 29.0 g of calcium carbonate are combined with 13.0 g of hydrochloric acid...
*September 22, 2013*

**math**

A professor wants to supplement her pension with investment interest. If she invests $26,000 at 7% interest, how much more would she have to invest at 9% to achieve a goal of $4,160 per year in supplemental income?
*September 6, 2013*

**spanish II**

Has anyone taken Spanish 2 in summer school from apex? What was it like?
*June 2, 2013*

**math**

Find the mininum product of two numbers whose sum is 55
*May 19, 2013*

**Math**

You and six of your friends will go on a roadtrip. A seven passenger minivan is rented for the weekend. How many different ways can you and your friends sit in this vehicle?
*May 6, 2013*

**Calculus**

thank you!
*May 2, 2013*

**Calculus**

would it be possible to get the steps? or some sort of explanation?
*May 2, 2013*

**Calculus**

lim x->0 (sinx)^x
*May 2, 2013*

**economics**

19-1 Bicycle Insurance and Information Asymmetry If bicycle owners do not know whether they are high- or low-risk consumers, is there an adverse selection problem? 19-2 IPOs and Adverse Selection Should owners of a private company contemplating an IPO (a sale of stock to the ...
*May 2, 2013*

**economics**

19-1 Bicycle Insurance and Information Asymmetry If bicycle owners do not know whether they are high- or low-risk consumers, is there an adverse selection problem? 19-2 IPOs and Adverse Selection Should owners of a private company contemplating an IPO (a sale of stock to the ...
*May 2, 2013*

**math**

writing algebraic expressions: 1. there were 3 times more sugar cookies baked than chocolate chip cookies 2. the kids ate 10 fewer cookies than the number of pies they made to sell 3. kino & sandra made 12 more pounds of cookie dough than tommy
*April 11, 2013*

**Justice**

D) b and c
*April 10, 2013*

**math**

I am sorry i cant find a way to add a picture of the diagram
*April 1, 2013*

**math**

mr.periwinkle owns a ranch.he wants to add an area in the shape of an equilateral triangle to one of his rectangular fields.if the length of the rectangular field is 3x feet and its area is (9x^2-6x)square feet,write an equation for the amount of fencing needed to make the new...
*April 1, 2013*

**calculus optimization problem **

A farmer has 460 feet of fencing with which to enclose a rectangular grazing pen next to a barn. The farmer will use the barn as one side of the pen, and will use the fencing for the other three sides. find the dimension of the pen with the maximum area?
*March 30, 2013*

**calculus**

find the interval(s) where the following functions are increasing and decreasing. f(x)= x/4 + 4/x
*March 29, 2013*

**calculus**

suppose the quantity demanded per week of a certain dress is related to the unit price p by the demand equation p=sqrt800-x. write the function that describes the revenue function? To maximize revenue how many dresses should be made and sold each week?
*March 29, 2013*

**statistics**

Suppose that the heights of female adults in the US are normally distributed with a mean (µ) of 65.4 inches and a standard deviation (σ) of 2.8 inches. Let X denote the height of a randomly chosen adult female. Find the probability that X is between 66 and 70 inches:
*March 15, 2013*

**Computers**

Select the first step in the Informative Processing cycle. storage output input processing
*March 11, 2013*

**Business English**

Which of the following statements is essential about how the standard pattern for informative and posiive messgaes should be applied? Use all five of the elements of the basic organizational pattern present each element in a separate paragraph of its own Present the ...
*March 11, 2013*

**math**

when rolling a die, do you think everyone will have the same results
*March 2, 2013*

**Algebra**

T o convert from X degrees centigrade to y degrees fahrenheit the function is f(x) 9/5x +32 find the inverse function f of negative 1. what does the inverse function represent? graph Help me!
*February 27, 2013*

**science**

Why do manufacturing industries have more problems controlling pollution then other kinds of businesses have?
*February 26, 2013*

**College Physics PLEASE HELP**

A cylindrically shaped piece of collagen is being stretched by a force that increases from 0 to 3.0 x 10^-2 N. The length and radius of the collagen are 2.5 and 0.091 cm. Young's Modulus is 3.1 x 10^6 N/m^2. a.) If the stretching obeys Hooke's Law, what is the spring ...
*February 23, 2013*

**College Physics PLEASE HELP**

A spring stretches 0.150 m when a 0.30 kg mass is hung from it. The spring is then stretched an additional 0.100 m from this equilibrium point and released. Determine a). the spring constant, k, b). the maximum velocity of the mass, c. ) the maximum acceleration of the mass, d...
*February 23, 2013*

**Physics**

A femur is a bone in the leg whose minimum cross sectional area is about 4.0 x 10^-4 m^2. A compressional force in excess of 6.8 x 10^4 N will fracture this bone. A.) Find the maximum stress that this bone can withstand and B.) What is the strain that exists under a maximum ...
*February 23, 2013*

**Physics**

A cylindrically shaped piece of collagen is being stretched by a force that increases from 0 to 3.0 x 10^-2 N. The length and radius of the collagen are 2.5 and 0.091 cm. Young's Modulus is 3.1 x 10^6 N/m^2. a.) If the stretching obeys Hooke's Law, what is the spring ...
*February 23, 2013*

**Physics**

A spring stretches 0.150 m when a 0.30 kg mass is hung from it. The spring is then stretched an additional 0.100 m from this equilibrium point and released. Determine a). the spring constant, k, b). the maximum velocity of the mass, c. ) the maximum acceleration of the mass, d...
*February 23, 2013*

**algebra**

electricity costs 7.57 a month plus 8.77 per kilo watt hour for the first 400 kWhr and 6.574 per kWhr for all useage over 400 in a month. what is the cost for 300 kWhr? 2638 What is the cost of 700? 7.57+8.77 times 400 and 6.574 times 300? 5487.77 I think. I need to write a ...
*February 23, 2013*

**Chemistry**

Hydrogen peroxide solution, H2O2(aq), is available with a concentration of 1.667mol/L. When diluted to a concentration of 0.25mol/L, the solution is used as a disinfectant. What volume of water should be added to 100 mL of the concentrated hydrogen peroxide solution to prepare...
*February 21, 2013*

**Chemistry**

A laboratory stockroom has a stock solution of 90%(m/v) sulfuric acid,H2SO4(aq). If a technician dilutes 50ml of the stock solution to a final volume of 300ml, what will be the new mass/volume percent concentration?(HINT: the dilution formula can be used for concentration ...
*February 21, 2013*

**Canadian Law**

thxxxx:)ur cool!
*February 20, 2013*

**Canadian Law**

Can you find a canadian case where the defence of mental disorder is used in late 2012 ti early 2013? I searched soooooooooooooooooooooooooo much I couldnt find it anywhere on the internet.. Please help me thanks in advance:)
*February 20, 2013*

**Chemistry**

Which of the following mixtures of KCl in water is a saturated solution and which is an unsaturated solution; 1)100g of KCl in 100mL of H2O at 40°C 2)50g of KCl in 100mL of H2O at 70°C 3) 120g of KCl in 100mL of H2O at 60°C My data is: Temperature82°C 58°C ...
*February 19, 2013*

**Chemistry**

Hi! I am doing this chemistry lab of solubility curve of a solid investigation and this is for KCl. The purpose of this lab is to investigate the relationship between the solubility of potassium chloride and the temperature of its solution and to create a solubility curve for ...
*February 18, 2013*

**Chemistry**

oh one more thing on the website what is the black line of on the solubility graph curve??How would I draw mine...I understand the blue one its just the black one...
*February 18, 2013*

**Chemistry**

Hi! I am doing this chemistry lab of solubility curve of a solid investigation and this is for KCl. The purpose of this lab is to investigate the relationship between the solubility of potassium chloride and the temperature of its solution and to create a solubility curve for ...
*February 18, 2013*

**albebra**

a cubic millimeter of the blood contains 22 to the 3rd power of white blood cells and 22 to the 5th power of red blood cells What is the ratio of whiteblood cells to red blood cells?
*February 18, 2013*

**Education**

B was exactly the same as A I think the test where my teacher got this from had a typo
*February 18, 2013*

**Education**

Bennett’s Developmental Model of Intercultural Sensitivity (DMIS) provides a continuum from A) individual to social development. B) individual to social development. C) insensitive to sensitive development. D) None of the answers are correct. I believe the answer is A, is...
*February 18, 2013*

**Solubility/English**

actually you know what I think I should be satisfied with howmuch you help so if you don't have time its ok I appreciate your time and help thankyou very much!
*February 17, 2013*

**Solubility/English**

thanks alotbut I hoped you would do some more so i know how to put chemistry stuff in these
*February 17, 2013*

**Solubility/English**

Ok so I have this procedure to rewrite in past tense passive voice please help me out here I have alot ofthings to do with this lab...your help isgreatly appreciated. Thankyou! 1) Set up a hot-water both by placing th 250/400mL beaker, about two-thirds full of water, on the ...
*February 17, 2013*

**Education/Technology**

What software features are important in selecting classroom management software, based on the classroom academic software evaluation rubric? A) The list includes grade level, documentation, cost, help features, and ease of installation. B) The list includes ease of updates, ...
*February 14, 2013*

**Education/Technology**

Productivity software that allows the student to create professional-looking pages with text, graphics, digital pictures, stylized headlines, and professionally prepared design elements is called: A) Desktop publishing software. B) Spreadsheet software. C) Graphics software. D...
*February 14, 2013*

**Education/Technology**

The type of software that uses fields, records, and files to organize and display data is A) classroom management software. B) electronic spreadsheet software. C) database management software. D) word processing software. I think this is C, to me it makes the most sense. Is ...
*February 14, 2013*

**Education/Technology**

Syllabi, class outlines, and discipline reports are practical applications of A) systems procedures. B) spreadsheet functions. C) database functions. D) word processing packages. I answer is C, it sounds where all three of these would be, is this correct?
*February 14, 2013*

**Education/Technology**

To get instant feedback for assessment, such as physical education fitness, a music lab activity, or reading competency, students have been shown how to use A) scanners or punch cards. B) handheld computers or PDAs. C) desktop or laptop computers. D) webcams or digital cameras...
*February 14, 2013*

**Education/Technology**

We already have D correct? So my answer should be A
*February 14, 2013*

**Education/Technology**

We anticipate that the next technology revolution will be A) virtual reality. B) wireless computers. C) voice input technology. D) 3-D images. I think the answer is C, is this correct?
*February 14, 2013*

**Education**

Is concept mapping a type of word processing software that helps with students with special needs?
*February 14, 2013*

**math**

a car travels at an average speed of 100 km/hr. how many km will the car travel in 2 hours, 15 min?
*February 13, 2013*

**Education/Technology**

Removable media are useful for a classroom teacher because they A) are read only. B) cannot be erased accidentally. C) have the greatest capacity of any storage device. D) are portable. I believe the answer is A, is this correct?
*February 10, 2013*

**calculus**

use implicit differentiation to find an equation of the tangent line to the curve at the given point. 9x^2+xy+9y^2=19, (1,1) (ellipse)
*February 8, 2013*

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