Monday

March 2, 2015

March 2, 2015

Number of results: 120,359

**Calculus**

assuming that you wish to have $19000 in 7 years and that the account earns 6% compounded continuously. Round your answer to the nearest cent. Answer:
*December 1, 2010 by Brooke*

**Calculus**

Evaluate: integral x^3/[sqrt*(x^2+100)]dx can someone tell me what they get as a final answer..I've been going at this for hours and don't get the answer in the back of the textbook
*January 18, 2011 by Jon *

**Calculus**

Evaluate: integral x^3/[sqrt*(x^2+100)]dx can someone tell me what they get as a final answer..I've been going at this for hours and don't get the answer in the back of the textbook
*January 18, 2011 by Jon *

**Pre-Calculus**

Evaliuate the differnce quotient f(x+h)-f(x)/ h for f(x) = X^2 + 2x - 2 currently i have done (x+h)^2 + 2(x+h)-2 - x^2-2x - 2 / h the answer is 2x+h+2 but each time i try to work on the problem i dont get this answer... thanks in advance
*February 1, 2011 by K.C*

**science**

can i get the full answer to : determine your distance traveled and displacement if you walk 100 m forward and then 35 m back ? answer son as possible please and thank you !!
*February 22, 2011 by destiny*

**maths**

Expand the brackets in the following expression (5y-3)^2 My answer is 5y^2-3^2 The answer i worked out seems to simple but is it correct? If not can someone tell me what i need to do. thanks
*March 8, 2011 by susan*

**Pre-Algebra Check**

1. Round your answer to the nearest tenth, if necessary. 22 miles/hour = ______ feet/second a. 0 b. 15 c. 1.5 d. 32.3 Answer: C? Thank you in advance!
*April 21, 2011 by Cheryl*

**maths**

What is the gradient of a line that has an angle of inclination of 75°? Enter the answer, rounded to 4 significant figures in the box below. the answer should be a number. ???
*May 8, 2011 by elizabeth*

**chemistry**

How many grams of MgO are produced when 40.0grams of 02 react with Mg? 2mg+O2--->2mgO Could you please set the problem up? I think the answer is 101, but I do not know how to get that answer. Thank you
*October 1, 2011 by Connie*

**Social Studies 7R - Qs. Check**

What is Preamble? I know the pre part is before but what about amble? My Answer: Intro of the Declaration of Independence. Is my answer is correct.
*January 31, 2012 by Laruen *

**Chemistry(Please check answer)**

The solubility product expression for mercury(I) iodide, Hg2I2 is Ksp = ? My answer is [Hg2^2+^][2I^-^]^2^ Would you agree?
*April 8, 2012 by Hannah*

**Algebra II **

Solve 4^(x+2)= 160 How would I round this answer to the nearest hundredth? My answer was 200, I don't believe I worked the problem out correctly.
*June 12, 2012 by Greg B.*

**aig math (please answer Ms.Sue)**

other than the digit 3, what is a number that could belong in the box? 1'3=1___ "1'3" is in exponents my answer is 1 am i right if not tell me why
*August 6, 2012 by lidia*

**Math**

A multiple-choice test has four possible answers for each question. If a student guesses at the answer, what is the probability that he or she selects the correct answer
*November 1, 2012 by Pamela Straw*

**english 3**

One of the key questions historical criticism attempts to answer is: Who made the most important scientific discoveries of the time? Answer
*December 4, 2013 by jasmine *

**Math**

5. Solve the proportion using cross product 18/20 = k/110 A. 99 (my answer) B. 122 C. 33 D. 2.9 (my answer) The reason why I picked 2 of them were because I'm stuck between the two
*March 12, 2014 by Easy Math problem *

**chem/math**

I need help solving for x here (I dont get the right answer, which is supposed to be x=0.137) 3.88 = 3.74 + log (x/0.1) Please explain how you would get that answer Thank you
*July 8, 2014 by Ann*

**Physics**

HI I'm just looking for an answer for 3 questions as my textbook does not explain the answer. How a tin can loses heat through: 1) Conduction 2) Convection 3) Radiation
*September 30, 2014 by Jamie*

**science **

A 5.0 kg model vehicle travelling at 14 m/s experiences a rocket boost of 85 N ( in the direction of motion) for 20 s What is the resulting speed? The answer is 350 but i dont know how to get to that answer
*November 6, 2014 by Danny*

**Math**

Hi! So I did this world problem and I got the answer "4194 units" (which is right) however, it says to round my answer to the nearest whole unit. How do I do that? Thanks!
*November 14, 2014 by Tamia*

**calculus**

hello! i just needed help to verify or falsify my answer and any explanation as to why would be extremely helpful! thanks ahead of time. y=(x^2)-6x+10 a. at x=3 b. at x=0 c. at x=1 d. at x=-3 my answer was D. thanks again!
*November 24, 2014 by kailey*

**calculus**

hello! i just needed help to verify or falsify my answer and any explanation as to why would be extremely helpful! thanks ahead of time. y=(x^2)-6x+10 a. at x=3 b. at x=0 c. at x=1 d. at x=-3 my answer was D. thanks again!
*November 24, 2014 by kailey*

**algebra 2**

Hi i posted this question: the general expression for consecutive multiples of 6 is 6N, 6(N + 1), 6(N +2), etc. find three consecutive multiples of 6 such that 4 times the first exceeds twice the third by 12. and than Bobpursley replied: Let N be the first, so n+1 is next, etc...
*July 18, 2007 by lana*

**Math**

1. (5yd 2ft) + (7yd 1ft) = ? 2. (6mi 10ft 4in) - (4mi 8ft 8in) = ? 3. 5(2yd 10in) = ? 4. What is the square root of 36/49? My Guesses: 1. 13yd 2. 10mi 18ft 12in 3 and 4. I have no idea. 3. 10yd 25 inches It gives 4 choices but 10yd 25in is not 1 of them... These are the ...
*June 29, 2007 by Chris*

**Calculus again**

Find the equation of the tangent to y=2-xe^x at the point where x=0 So I found the first derivative by doing the sum rule and product rule. I got e^(x)(x-1) Then I found the slope by substituting 0 for x and got -1. Then I found y by substituting 0 into the original equation ...
*June 5, 2008 by Sam*

**stats help please**

Suppose that one of every 100 people ina certain community is infected with HIV. You want to identify an HIV-positive person ina study of an experimental new drug. How many individuals would you expect to have to interview in order to find the first person who is HIV-positive...
*January 23, 2007 by david*

**To Tammy**

See the answer to the problem you posted about 10E and 11E. I unintentionally put the 10 and 11 as subscripts in my answer to your question last night instead of superscripts as above. The answer I gave you is correct but I should have used superscripts instead of subscripts.
*October 23, 2007 by DrBob222*

**Math**

I factored 3.6x^6+2x^6-2.8x^2+3.2x as; 3.6x^7+2x^6-2.8x^2+3.2x However my answer is incorrect. The correct answer should be; 0.4x(9x^6+5x^5-7x+8) How do I get to the correct answer? So that I am able to do similar problems, because every problem that I have factored with ...
*August 7, 2010 by Lynn*

**math**

(4-y^2)/(y-2) = y/2 (4-y^2)/(y-2) = y/2 4 - y^2 = (y*(y-2))/2 4 - y^2 = (y^2-2y)/2 8 - 2y^2 = y^2 - 2y 3y^2 - 2y - 8 = 0 (keep the above equation in mind) quadratic formula: (-b +/- sqrt(b^2 - 4ac))/2a now solve by plugging in the appropriate numbers and choose (normally) the ...
*October 30, 2006 by math*

**vocabulary help**

When the realtor realized that there was a large dent in the floor, he tried to __________ cover it before the potential buyers noticed it. flagrantly ostensibly (my answer) surreptitiously latently Choose the word that best completes the sentence. After traffic made them late...
*October 15, 2014 by Sara*

**Physical Science**

I needed help on these 3 questions that I don't quite understand. Can someone please explain to me how to solve the answer? Use this scenario to answer questions 1-3: A car crashes in a tree at a velocity -26.6 m/s. The passenger in the car is wearing a seat belt and is ...
*March 28, 2009 by mysterychicken*

**AP Physics**

A ball is thrown horizontally from the top of a building 51 m high. The ball strikes the ground at a point 120 m from the base of the building. The acceleration of gravity is 9.8 m/s 2 Find the x component of its velocity just before it strikes the ground. Answer in units of m...
*September 11, 2012 by Noah*

**Math**

Simplify the expression. (-4)^-6(-4)^-7 My answer: -4 Simplify and give the answer in scientific notation. (5 X 10^6((3 X 10^5) My answer: 1.5 X 10^12 (3 X 10^6)(8 X 10^-4) My answer: 2.4 X 10^3 Astronomers measure large distances in light-years. One light-year is the distance...
*February 6, 2014 by Anonymous*

**social studies**

i have a crossword puzzle but i have one word i can't figure out.the clue: the------i- coastal plain is a strip of land that begins in the norteast and runs along the east and gulf coasts.please help me. http://en.wikipedia.org/wiki/Atlantic_Coastal_Plain can you give me an ...
*September 12, 2006 by ashley*

**algebra am i right**

Find the volume of a right circular cylinder whose base has an area of 6 cm^2 and whose height is 17 cm. [A] 153ð cm^3 [B] 612ð cm^3 [C] 102 cm^3 [D] 153ð cm^2 [E] None of these i think its C Please show your work. That's the right answer, but we'd like to know why too. um i ...
*September 27, 2006 by cassii*

**calculus please help**

what is the integral of x/(1+x^2)^2 dx This is a question of a past AP exam of calculus BC i know i have to use the substitution method where u=(1+x^2), du=2xdx. I have to find the integral but i'm just focused on the coefficient because i get a different answer for that part ...
*April 4, 2007 by david*

**chem**

Mass of tablet: 1.4930g Volume of HCL added: 100ml Find the milimoles of HCL added I have many questions similar to this, could someone explain how to do this...do I just find the # of moles regularly and multiply by 1000? any help would be much appreciated
*October 16, 2007 by Alexa*

**Math**

I need to understand how to do the problem and not the answer. P.S. bobpursley, no offense but I didn't understand what your response meant. That information I already know but I need to know how to do the problem to get 213 as the answer. Anida won the class election by ...
*May 24, 2009 by Ninja*

**Trig**

A force of 323 newtons makes an angle of 54 degrees and 20 minutes with a second force. The resultant of the two forces makes an angle of 39 degrees forty minutes with the first force. Find the magnitude of the second force. I have the answer, 814.3022, but I need to know how ...
*October 19, 2010 by Brittany*

**physics**

A curve of radius 20 m is banked so that a 970 kg car traveling at 50 km/h can round it even if the road is so icy that the coeﬃcient of static friction is approximately zero. The acceleration of gravity is 9.81 m/s^2 Find the minimum speed at which a car can travel ...
*November 1, 2012 by JoAnna*

**Physics**

A freestyle skier hits the take off ramp with an initial velocity of 17.5 m/s with a purely vertical take off (90 degrees). What is the peak height that the skier will reach? Can you fully explain to me how to get this answer? I did the formula d=Vi*deltT+(1/2)(a)(t^2). To get...
*February 27, 2013 by Caitlyn*

**statistics**

From past experience it is felt that the random variable, X, the age of a mother at the birth of her first child, is normally distributed with a mean of 21.3 and a variance of 16. Find the probability that a randomly selected mother: (a) has her first child before age 16 (b) ...
*January 26, 2011 by Tian*

**Math**

1. The ratio of the number of dimes to the number of pennies in a purse is 3 to 4. If 3 pennies are taken out of the purse, the number of dimes and the number of pennies in the purse will be equal. How many dimes are in the purse? (Answer key says 9- and if I multiply the ...
*February 9, 2015 by Wendy*

**Math**

12+4n/3 = 8 Not multiple choice.. trying to find n. My answer is 7 9a - 3(a -6) = -6 Not multiple choice.. I'm not quite sure how to do this The width of a rectangle is 6 in. less than its length. The perimeter is 68 in. What is the width of the rectangle? Not multiple choice...
*September 17, 2014 by Anonymous*

**statistics**

Consider the following. (a) What percentage of a normal distribution is greater than the mean? (Give your answer correct to the nearest percent.) Incorrect: Your answer is incorrect. . % (b) What percentage is within 1 standard deviation of the mean? (Give your answer correct ...
*May 26, 2013 by Gayle*

**Statistics**

Consider the following. (a) What percentage of a normal distribution is greater than the mean? (Give your answer correct to the nearest percent.) Incorrect: Your answer is incorrect. . % (b) What percentage is within 1 standard deviation of the mean? (Give your answer correct ...
*May 27, 2013 by Gayle*

**math **

Consider the following. (a) What percentage of a normal distribution is greater than the mean? (Give your answer correct to the nearest percent.) Incorrect: Your answer is incorrect. . % (b) What percentage is within 1 standard deviation of the mean? (Give your answer correct ...
*May 30, 2013 by Nora 2*

**math**

Find the exact length of the curve analytically by antidifferentiation. You will need to simplify the integrand algebraically before finding an antiderivative. 1. y = (1/3)(x^2 + 2)^(3/2), from x = 0 to x = 3 and 2. x = (y^3)/3 + 1/(4y), from y = 1 to y = 3 [HINT: 1 + (dx/dy)^...
*February 4, 2008 by todi*

**pre calculus**

Having a bit of a problem with this for the given functions f, g and h. find f*g*h and state the exact domain of f*g*h Please show all your work f(x) = inx g(x) = x -169 h(x) = 9x^2
*December 21, 2011 by Amy*

**math**

two drums contain 600lts. and 800 lts. of water . find the size of the largest vessel that can be filled an exact number of times from each drum.
*August 19, 2012 by sumit*

**trig**

Find all solutions of cos (x) + 1/2 sec (x) = -3/2 in the interval (2pi, 4pi) (Leave your answers in exact form and enter them as a comma-separated list.)
*July 31, 2013 by Holly*

**Trigonometry**

Find all solutions of 4(sin(x)**2)-8cos (x) -8 = 0 in the interval (2pi, 4pi). (Leave your answers in exact form and enter them as a comma-separated list.)
*July 31, 2013 by Holly*

**Math**

Suppose that è is an angle in standard position whose terminal side intersects the unit circle at ((-15/13),(12/13)). Find the exact values of cscè, tanè, and sinè.
*April 17, 2014 by Nick*

**math**

I believe the answer is 5 months; however, I did it the long way. Explain how to find the answer. Tom has a collection of 30 CDs and Nita has a collection of 15 CDs. Tom is adding 1 CD a month to his collection while Nita is adding 4 CDs a month to her collection. Find the ...
*December 31, 2011 by Jane*

**Geometry**

Find the area of the following circle. ( = 3.14; round answer to the nearest whole number). Circumference = 120 cm. (Hint: Find r from C = 2r (round r to tenths); then find area).
*January 16, 2011 by Ivan*

**Earth Science - Please Check My Answer**

Please help me with the following question: Please select the word from the list that best fits the definition Creates clouds, snow, sleet, rain and hail A. Radiation B. Conduction C. Convection D. Water Cycle I think the answer is mostly B, but I think it could be D as well. ...
*January 19, 2015 by Brady*

**Science**

Am I correct with my answeres below? During which hours of the day is the earth's emitted radiation highest and Why? My Answer: I think it is in the afternoon because of the increase in surface temperature. Why are values of LW^ higher in the summer than in the winter? My ...
*March 9, 2009 by Mama Mia*

**Chemistry**

Cola drinks have a phosphoric acid content that is described as `from 0.057% to 0.084% of 75% phosphoric acid, by mass." Estimate the pH range of cola drinks corresponding to this average range of H3PO4 content. I am having trouble with the wording of this question, I know I ...
*February 3, 2015 by Ken*

**Science. NEED HELP PLEASE**

Can someone check if these are right: Tell the reaction rate 1.)Question: one antacid tablet is placed in a glass of cold water, while another table is placed in a glass of hot water. Answer:TEMPERATURE 2.) Question: a mixture of baking powder, flour, sugar, and eggs is placed...
*January 14, 2014 by Kalie *

**English**

Choose the best answer 1. What do you get if you mix common bacteria and vinegar. The word common means a. multiple b. ordinary - the answer c. lower-class d. poisonous 2. It is a serious question. The answer is you get bacteria that eat toxic waste and turn that waste into ...
*March 10, 2014 by Anonymous*

**math,help**

on one of last week homeworks i got this one wrong can someone explain to me what is the correct format. The demand supply equations for a certain item are given by: D= -5p+40 S=-p^2+30p-8 The correct answer was: $1.43 how do you get to this answer because i've tried it and it...
*April 19, 2007 by jasmine20*

**Stats **

I need help with this problem for school. For the first one i got .3758 and second 1.6, but i don't think they are right. My calculations are off It is known that about 20% of car insurance policies include emergency road service. Suppose we randomly select 10 car insurance ...
*February 15, 2011 by John*

**Physic**

A 220 g cart moves on an air track (a one-dimensional system in which motion is friction free) at 1.3 m/s. It collides with and sticks to another cart of mass 550 g, which was moving in the opposite direction at 0.80 m/s before the collision. What is the velocity of the ...
*April 30, 2014 by Anonymous*

**algebra problem**

I need to find the equation of a parabola. I am not sure if this is the correct way or if I have the correct answer. Vertex at origin, focus is at (0,3) Equation of parabola vertex (0,0) focus (0,3) focus (h,k+p) (0,0+3) y=0-3 directrix y=-3 a=(1/4)(p) a=(1/4(-3))=(-1/12) a=(-...
*April 30, 2008 by Tim*

**Statistics**

I need to know how to find the probability that z0 is greater than or equal to 2.40 using my TI-83+. The answer is .008200, but I don't know how to get that using my calculator. The only reason I know the answer is because it is an example from my homework. Please help! On a ...
*December 4, 2012 by Chris*

**Math for Educators**

Use Gauss's approach to find the following sums (do not use formulas). a. 1 + 2 + 3 + 4 +...+ 102 b. 1 + 3 + 5 + 7 +...+1001 a. The sum of the sequence is ? My answer 102-51(103)= 5,253 b. The sum of the sequence is? My answer 500.3(1,002)=501,300.6 Are my answers correct? If ...
*June 4, 2013 by Carol*

**Physics**

In a resonance-tube containing air, the source of sound is a small loudspeaker driven by a variable-frequency oscillator. The distance between successive antinodes is 10 cm for a frequency of 1625 Hz. When the frequency is slowly reduced, the standing wave pattern at first ...
*March 16, 2013 by Priscy*

**8th Grade Math**

*I NEED THESE IN ALGEBRAIC EXPRESSIONS! 1.) The larger of two numbers is 1 less than 3 times the smaller. Their sum is 63. Find the numbers. 2.) Find two numbers whose sum is 92, if the first is 4 more than 7 times the second. 3.) The sum of two numbers is 172. The first is 8 ...
*November 8, 2010 by Disha*

**calculus**

Hi i have two questions: what is the exact value of cos 5(pie)/12? what is the exact value of cos2(pie)/9 cos(pie)/18 + sin2(pie)/9 sin(pie)/18? thank you
*May 8, 2013 by Maria*

**Chemistry**

The phosphoric acid in a 100.00 mL sample of a cola drink was titrated with 0.1476 M NaOH. The first equivalence point was detected after 13.32 mL of base added, and the second equivalence point after 28.65 mL. Calculate the concentration of H2PO4- in mol/L. (Hint: if only ...
*January 29, 2010 by Jenna*

**Math**

A bicyclist is competing in a tournament. He is currently in a very hilly part of the tournament's course. For his current hill, his height in metres over time in minutes is modelled by the function; f(x)=-0.00075x^2-0.5825x+17.269 a) Estimate the bicyclists instantaneous rate...
*February 14, 2014 by Jennifer*

**Trig**

how do i find the exact value of s [pie/2, pie] sin s = radical2/ whole number 2 what is s in radians? how do i figure this out without the use of a calculator. I drew the graph and located it in the second quadrant and i think the triangle is a 45-45-90 but i don't how to ...
*September 15, 2011 by ALISON*

**Social studies**

Could you please check these other sets of terms. Here are the terms: scarcity cost benefit analysis marginal revenue needs incentives economy opportunity cost variable costs capitalism marginal cost food, clothing,shelter, and other things required for survival. Answer: needs...
*March 23, 2009 by Sam*

**Precalculus**

From a point on ground level, you measure the angle of elevation to the top of a moutain to be 38 degrees. Then you walk 200 m fartheraway from the mountain and find that the angle of elevation is now 20 degrees. Find the height of the mountain. Round the answer to the nearest...
*November 19, 2006 by Anonymous*

**Math**

1. Find the value of Sin^-1(-1/2) a. -30 degrees b. 30 degrees c. 150 degrees d. 330 degrees 2. Find the exact value of cos(-420 degrees) a. -1/2 b. 1/2 c. sqrt of 3/2 d. -sqrt of 3/2 3. p(-9/41, 40/41) is located on the unit circle. Find sin theta. a. 40/41 b. -9/41 c. -9/40 ...
*April 5, 2008 by Belden*

**Math (Pre-Calculus)**

9t^4 + 6t^2 + 2 the problem is asking for the value of t at which the graph is at it's minimum. what i did was set t^4 to x^2 and t^2 to x. So that means I have 9x^2 + 6x + 2. Completing the square and the vertex formula gave me the same answer of -1/3 as x. So setting that ...
*October 15, 2009 by Kaz*

**Algebra: Answer Check**

1) 5 = 2t - s 20 = 8t - 4s Answer: Identity 2) 4t - 6s = 2 -6t + 9s = -3 Answer Identity
*March 2, 2009 by Gabby*

**Math**

evaluate |-24|-|-22| answer -2? -|-618|answer -618 3-|7-9|answer 5? ?
*October 17, 2009 by david*

**Math**

Use properties of logarithms to find the exact value of this expression. Do not use a calculator. 6log6 8 - log6 7
*October 25, 2008 by Kristina*

**trig**

how can i find all the exact solutions to the equation : 2cos^2x + 3sinx = 3 the solutions have to be between [0,2pi)
*July 18, 2009 by Joe*

**trig**

find the exact value of cos(theta) if the terminal side of angle(theta) contains the point (-3,5)
*January 31, 2010 by rob*

**trig**

Given that sin (pi/10)=(sqrt(5)-1)/4, use double-angle formulas to find an exact expression for sin(pi/5).
*May 16, 2011 by Victoria*

**college algbra**

find the domain f(x)=x/x-8,g(x)=-7/x solve the following exponential equation equation exact answers only 3e x-1 = 2+e^x-1
*November 26, 2012 by zach w*

**Math**

sec(alpha) = -4(√(5))/5 find exact values at alpha for the remaining five trig functions
*April 10, 2013 by Tina*

**Calculus (please help!!!!)**

Consider the parameterization of the unit circle given by x=cos(4t^2−t), y=sin(4t^2−t) for t in (−InF, INF). Describe in words and sketch how the circle is traced out, and use this to answer the following questions. (a) When is the parameterization tracing ...
*April 14, 2011 by Catherine*

**calculus**

x^2 + y^2 = 25 3x + y = 15 Find the two points of intersection. I don't just want the answer, if you could tell me how to find it, it would save my life. The sqaure root is making it really hard for me to understand.
*January 20, 2009 by Nicole*

**Math(Please check)**

g(x) = (3/2)^x+2 I need to find the intercepts. My teacher told me to press trace on my graphing calculator to find them. I got x = 0 and y=3 everything else is decimals so is my answer just (0,3)?
*March 23, 2010 by Abbey*

**MATH**

Isopropyl alcohol, C3H8O, is used in rubbing alcohol mixture. Alcohol on the skin cools by evaporation. How much heat(in kJ) is absorbred by the alcohol of 2.25g EVAPORATED? THE HEAT VAPORIZATION OF Isopropyl alcohol is 42.1 kJ/MOL Compute the number of moles of C3H8O that ...
*June 11, 2007 by LEO*

**mth174**

A tank is full of water. Find the work W required to pump the water out of the spout. (Use 9.8 for g and 3.14 for π. If you enter your answer in scientific notation, round the decimal value to two decimal places. Use equivalent rounding if you do not enter your answer in ...
*February 7, 2012 by Alex*

**Calculus 2**

A tank is full of water. Find the work W required to pump the water out of the spout. (Use 9.8 for g and 3.14 for π. If you enter your answer in scientific notation, round the decimal value to two decimal places. Use equivalent rounding if you do not enter your answer in ...
*June 22, 2013 by Liz*

**English please check my answer**

Please check my answer thank you. Gastrectomy is listed as the principal procedure on the surgical report. You know that (-ectomy) means excision or surgical removal. What part of the medical word does "ectomy " represent ? A. Root B. Suffix C. Prefix D. Combining form My ...
*March 19, 2008 by Dakotah*

**Math-check my answer**

check my answer please..... 1 euro is worth 1.2 U.S dollars if I budget 150$ per night for a hotel room. What is the maximum number of euros I should spend for a room? My answer is 108 euros as a maximum (with an actual number of 107.425) Correct???
*September 15, 2009 by Christy*

**Chemistry**

estimate Delta H for the following reaction C2H4 (g)+3O2(g)→2 CO2(g)+2 H2O(g) So we have (4) C-H bonds and (1) C=C bond or (H = 4*414 + 615= 2271) For oxygen, (3) O=O bonds or (H = 3*502=1506) 2CO2 is (2) O=C=O (H=730*4=2920) 2H2O is (2) H-O-H or (H=4*464=1856) Delta H...
*December 7, 2014 by Mahnoor*

**Chemistry**

estimate Delta H for the following reaction C2H4 (g)+3O2(g)→2 CO2(g)+2 H2O(g) So we have (4) C-H bonds and (1) C=C bond or (H = 4*414 + 615= 2271) For oxygen, (3) O=O bonds or (H = 3*502=1506) 2CO2 is (2) O=C=O (H=730*4=2920) 2H2O is (2) H-O-H or (H=4*464=1856) Delta H...
*December 7, 2014 by Anon*

**Physics**

A 32-u oxygen molecule (O2) moving in the +x direction at 580 m/s collides with an oxygen atom (mass 16 u) moving at 870 m/s at 27 degrees to the x axis. The particles stick together to form an ozone molecule. Find the velocity of the ozone. Express your answer in terms of the...
*April 13, 2009 by Jacob*

**Math**

I need help trying to write out these binomial expansions: they all need to be raised to the 8th power. Thanks 1. (x + y) 2. (w + z) 3. (x - y) 4. (2a + 3b) - Now explain how your answer for #1 could be used as a formula to help you answer each of the other items. In each case...
*April 16, 2012 by Samantha*

**Math check answer please**

Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling at 40mph, B is traveling at 44 mph. Train A passes a station at 820am, train B passes the same station at 850. At what time will train B catch up to train A. My estimate is 924am
*July 8, 2010 by Christy*

**Algebra**

A theater has 38 rows with 23 seats in each row. Estimate the number of seats in the theater and tell how you arrived at your estimate
*September 10, 2014 by Kali G*

**Physics**

A runner is jogging at a steady 2.7 km/hr. When the runner is 7.7 km from the finish line, a bird begins flying from the runner to the finish line at 5.4 km/hr (2 times as fast as the runner). When the bird reaches the finish line, it turns around and flies back to the runner...
*September 21, 2013 by Theresa *

**Phys**

i cant get this no matter what i try; A curve of radius 40 m is banked so that a 1070 kg car traveling at 60 km/h can round it even if the road is so icy that the coeﬃcient of static friction is approximately zero. The acceleration of gravity is 9.81 m/s a)Find the ...
*March 2, 2011 by HELP JOHN*

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