Saturday

December 20, 2014

December 20, 2014

Total # Posts: 243

**Chemistry**

100 cm3 of alkane X with the general formula CxHy requires 650 cm3 of oxygen for complete combustion. Deduce the structural formulae for the isomers of X.
*December 17, 2014*

**Physics**

a 60-kg student travelling in a car with a constant velocity has a kinetic energy of 1.2 *10^4 J. What is the speedometer reading of the car in km/h?
*December 11, 2014*

**English**

In this novel, Moon Shadow comes to America to be with his father, Windrider, from their home in the Middle Kingdom. As Moon Shadow and his father struggle to survive in a hostile country, they somehow find time to focus on their dreams. Windrider has read about the flying ...
*December 9, 2014*

**English**

Yes but i dont really get the question or the book, please help
*December 9, 2014*

**English**

In the book dragonwings why does windrider break the rules and go after black dog? Why does the tiger genral cooperate with windrider?
*December 9, 2014*

**English**

In the book dragonwings why does black dog beat up moon shadow? What does the fact that the boy is not angry at black dog suggest or tell you about him?
*December 9, 2014*

**English**

In the book dragonwings why doesn't moon shadow attend public school? How is he being educated?
*December 9, 2014*

**Calc I**

I am having trouble taking the derivative of the following: t(4-t^2)^(1/2) I can't decide if you need to use the product rule or not. What I did is used the PR to get (4-t)^1/2)*1t^2*(4t-1)^(-1/2) Is this correct?
*December 7, 2014*

**Chemistry**

2K2Cr2O7 + 8H2SO4 + 3C2H5OH → 2Cr2(SO4)3 + 2K2SO4 + 3CH3COOH + 11H2O
*November 29, 2014*

**Chemistry**

During a Breathalyzer Test it was determined that 1.60mg of K2Cr2O7 was consumed by the above reaction. Calculate the number of milligrams of ethanol in the test sample.
*November 29, 2014*

**science**

a mechanic applies the force of 50 N at a distance of 40 cm from the pivot on a wheel wrench . what is the size of the moment ?
*November 9, 2014*

**Calculus **

Please check, if there is something wrong please explain what I did wrong. Thank you! Calculate the d^2y/dx^2. y= e^-x + e^x y' = e^x - e^-x y'' = e^x + e^-x Find the x-coordinace of all critical points of the given function. determine whether each critical point ...
*November 6, 2014*

**chemistry**

If you dissolve 236.5 g of (NH4)3PO4 and 166.9 g of K3PO4 in enough water to make the volume of the solution 505.0 mL What is the molarity of ammonium ions and phosphate ions?
*November 2, 2014*

**Physics**

At t=0 a grinding wheel has an angular velocity of 24.0rad/s . It has a constant angular acceleration of 35.0rad/s2 until a circuit breaker trips at time t = 1.90s . From then on, it turns through an angle 436rad as it coasts to a stop at constant angular acceleration. Through...
*October 5, 2014*

**Math **

F(x)=2sin(3x/2-3pi/4)+2
*September 28, 2014*

**Math**

Solve the given quadratic equation exactly using the quadratic formula. Write the solutions in its simplest form. Using a calculator, determine all irrational solutions to the nearest thousandth. Separate the solutions with a comma and list the smaller one first. For the ...
*September 23, 2014*

**Math**

In mr.kingmans math class four fifths of the stundents earned an a on their math exam.the rest of the class earned a b .what percent of the class earned an a ? WhAt percent of the class earned a b
*August 10, 2014*

**PHYSICS**

Two dogs pull horizontally on ropes attached to a post; the angle between the ropes is 62.0∘. Dog A exerts a force of 270N , and dog B exerts a force of 302N . Find the magnitude of the resultant force. Find the angle the resultant force makes with the rope of dog A.
*August 10, 2014*

**PHYSICS**

A dockworker applies a constant horizontal force of 71.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 10.0m in a time of 5.50s . If the worker stops pushing after 5.50s , how far does the ...
*August 10, 2014*

**Chemistry Help**

1. Spectroscopic studies of the reaction of azide ion with the cluster [Ru3(CO)12] in acetone solvent confirmed the occurrence of process (i) under a CO atmosphere. Kinetic measurements of this rapid [Ru3(CO)12]+ N3– →[Ru3(NCO)(CO)11]–+ N2(i) reaction revealed ...
*July 26, 2014*

**ENG1511 ENGLISH**

Good Day, Please help Correct the following sentences for subject verb-agreement, tense or fragment. When he thought he could afford to pay his own school fees. Going home now, how I wish I could get there before it starts to rain. I am writing my homework after every class
*July 21, 2014*

**ENG1511 - english**

Good Day, Please help Either subject verb-agreement, tense or fragment. When he thought he could afford to pay his own school fees. Going home now, how I wish I could get there before it starts to rain. I am writing my homework after every class.
*July 21, 2014*

**Physics**

1. How is average speed related to instantaneous speed? What certain conditions must be met for the two variables to have the same or close value? 2. Cite one practical example on the use of the concepts of instantaneous speed, average speed in observing safety on the road.
*July 2, 2014*

**Physics**

Dina walked North and East and has a resultant displacement of 125, 35^0 East of North. She has a velocity of 2.5 m/s. Compute her walking time and average speed.
*June 26, 2014*

**Physics**

1. A person runs 800. m at an average speed of 6.00 m/s and then the next 800. m at an average speed of 8.00 m/s. Calculate (a) the total time of travel and (b) the average speed. 2. Sam travels by car from one city to another. He drives for 45.0 min at 95.0 km/h, 30.0 min at ...
*June 24, 2014*

**Physics**

On the way to class, you walk north and then west such that your resultant displacement is 290 m in a direction 25deg west of north. Your average velocity is 2.0 m/s in the same direction as the displacement. Calculate (a) your walking time and (b) your average speed.
*June 24, 2014*

**Math**

Compare and contrast the solutions of ax^2 + h = 0 to the solutions of ax^2 = h, where a and h are positive.
*June 19, 2014*

**Math**

1. What is the tenth term of the geometric sequence whose first term (a1) is 16 and the common ratio (r) is –½? 2. Given the terms a10 = 3 / 512 and a15 = 3 / 16384 of a geometric sequence, find the exact value of the first term of the sequence.
*June 18, 2014*

**Math**

Given: ________, – 243, – 226, – 209, – 192, – 175, … The 67th term of the sequence is __________. The series of the first 27 terms of the sequence is __________.
*June 18, 2014*

**Math**

– 11 is the __________ term of the arithmetic sequence – 847, – 836, – 825, – 814, – 803, …
*June 17, 2014*

**Physics**

A person runs 800. m at an average speed of 6.00 m/s and then the next 800. m at an average speed of 8.00 m/s. Calculate (a) the total time of travel and b) the average speed.
*June 17, 2014*

**Math**

Find the value of x so that 3x – 2, 2x – 1 and 4x – 3 form an arithmetic sequence.
*June 17, 2014*

**Math**

Black Eyed Peas’ 2011 Live Concert is to take place in a circular park. Due to the shape of the area, seats are set up so that the innermost row has 64 seats and each successive row has 17 more seats than the row before it. The park’s open area can accommodate 17 ...
*June 17, 2014*

**college math**

The area of a wetland drops by 15 every 9 years. What percent of its total area disappears after 45 years?
*April 1, 2014*

**Physics**

What would be the total distance traveled?
*March 23, 2014*

**Physics**

A stone is thrown in the air with an initial velocity of 50 m/s at 37 degrees to the horizontal. Find the total time the ball is in the air.
*March 23, 2014*

**Physics**

The rope forms a triangle with the pole and the angle is between the rope and the point at which it connects to the pole.
*March 12, 2014*

**Physics**

A carnival seat and a passenger has a combined weight of 193. As the seat is spun on a 18m rope tethered to a pole at an angle of 59.2 degrees, at what speed is the seat traveling?
*March 12, 2014*

**Finance**

Find the APR, or stated rate, in each of the following cases EAR: 12.4 semianually 13.3 monthly 11.0 weekly 14.7 infintely
*February 23, 2014*

**English**

Thank you, Tyler and Ms. Sue.
*February 19, 2014*

**English**

present
*February 19, 2014*

**English**

Selina Sanchez, together with her colleagues, ________ a competitive market research model for other businesses to follow. (Points : 1) present presents
*February 19, 2014*

**Physics**

A ball has an initial velocity of -23m/s. If the ball has a new velocity of 76m/s after 27 seconds, what is the ball acceleration
*December 12, 2013*

**math**

If Julie bought 8 T-shirts, she would be short $28. If she bought 4 T-shirts and 3 baseball hats, she would have $17 left. If each hat cost $5, how much money did she have in the beginning?
*November 7, 2013*

**math**

Laundry- detergent $7.99 T Flower- bouquet $3.99 T, A grocery store receipt shows 5% state tax due on laundry detergent and a flower bouquet. Does it matter whether the tax is calculated on each separate item or the total cost? Explain.
*November 6, 2013*

**math**

Sarah bought 8 folders and 3 rulers. Lea bought 8 rulers and 3 folders. Sarah paid $1.25 more than Lea. How much was each folder if each ruler was 45 cents?
*November 1, 2013*

**math**

Stephen drove at a constant speed from Town X to Town Y at 9 A.M. yesterday. Half an hour later, Cole drove from Town X to Town Y at a constant speed that was 30km/h faster than Stephen's. By 9:30 A.M., Stephen traveled 40 km. Cole caught up with Stephen at Town Y, ...
*October 24, 2013*

**math**

What is 20 divide by 6400?
*October 23, 2013*

**math**

Stephen drove at a constant speed from Town X to Y at 9 A.M.yesterday. Half an hour later Cole drove from Town X to Y at A constant speed that was 30 km/h faster than Stephens. By 9:30 A.m, Stephanie had already traveled 40 km. Cole caught up with Stephen at Town , arriving at...
*October 22, 2013*

**math**

This year the Sum of Mr. Bellinis age and his son's age his son's age is 38 years. 4 years ago, Mr. Bellini was 5 times as old as his son. How old is his son this year? How old is Mr. Bellini this year?
*October 10, 2013*

**math**

When dividing 0.08 by 0.4 I come up with 5, but I need to show it in a graph. I can't figure out how to do this
*October 10, 2013*

**thank you**

Thanks for your help Jai. ;)
*October 8, 2013*

**math**

This year, the sum of Mr. Bellini's age and his son's age is 38 years. 4 years ago, Mr. Bellini was 5 times as old as his son. How old is his son this year? How old is Mr. Bellini this year?
*October 8, 2013*

**math**

Thank you so much Steve. :)
*October 7, 2013*

**math**

Deepak is 10 years old, and his brother is 7 years old. In how many years time will their total age be 41.
*October 7, 2013*

**SS**

wow had the same questions on my quiz and got them all right
*September 29, 2013*

**solve algebra equation**

32.1=a-21.8
*September 19, 2013*

**Chemistry**

The post that I followed for #1 ended up with the wrong answer
*September 11, 2013*

**Chemistry**

A 16.0 g sample of a compound known to contain 3 ion species is dissolved in 100. g of water. The boiling point of the solution is 103.1°C. What is the molar mass of the compound?
*September 11, 2013*

**Chemistry**

Hard ball candy is prepared from boiling an aqueous sugar solution that has a boiling point of 260.°F. What is the molality of this solution?
*September 11, 2013*

**Chemistry**

What is the freezing point of a solution of sucrose (table sugar), a nonelectrolyte, that contains 60.0 g of C12H22O11 dissolved in 413 g of water?
*September 11, 2013*

**Chemistry**

A solution is made by mixing 90.6 g of magnesium sulfate heptahydrate with 2320.0 g of water. 690.00 mL of the solution has a mass of 745.20 g. What is the molarity of the magnesium sulfate solution?
*September 11, 2013*

**Chemistry**

If you are making 230.0 mL of 2.70% (m/m) CuSO45 H2O, how many grams of the solute should you use?
*September 11, 2013*

**Trig**

Suppose a CD player makes 48 revolutions per minute. Through how many degrees will a point on the edge of a CD move in 1 minute? In 2 sec?
*July 5, 2013*

**Trig**

A tire is rotating 600 times per minute. Through how many degrees does a point on the edge of the tire move in 1 minute?
*July 5, 2013*

**Chemistry**

A tire is rotating 600 times per minute. Through how many degrees does a point on the edge of the tire move in 1 minute? In 1 second?
*July 5, 2013*

**Chemistry**

Suppose a CAV player makes 48 revolutions per minute. Through how many degrees will a point on the edge of a CD move in 1 minute? In 2 sec?
*July 5, 2013*

**Math**

What is 36 over 156 in simplest form?
*June 26, 2013*

**statistics**

Let x and y be the amounts of time (in minutes) that a particular commuter must wait for a train on two independently selected days. Define a new random variable w by w = x + y, the sum of the two waiting times. The set of possible values for w is the interval from 0 to 2a (...
*June 10, 2013*

**grammar please help!**

thank you so much!
*May 1, 2013*

**grammar please help!**

1.D 2.A?
*May 1, 2013*

**grammar please help!**

I still need help on 1 and 2. Identify the object of the preposition in each of the following sentences. 1. Ashley and her father arrived home from work. a. and b. father c. from d. work 2. Ashley put her journalism books in the new bookcase. a. bookcase b. put c. new d. in ...
*May 1, 2013*

**6th grade grammar please help**

thank you but I'm still confused on 1 and 3 could you explain why its not from and in.
*April 30, 2013*

**6th grade grammar please help**

I need a good grade in grammar so please check my answers! Identify the object of the preposition in each of the following sentences. 1. Ashley and her father arrived home from work. a. and b . father c. from d. work 2. Ashley’s bedroom was across the hall. a. bedroom b. ...
*April 30, 2013*

**Calculus**

Find dy/dx by implicit differentiation for x^2 - 2xy + y^3 = C
*April 28, 2013*

**Chemistry**

How many grams of CuSO4 * 5H2O are needed to prepare 100mL of a 0.10 M solution ?
*April 4, 2013*

**Chemistry**

Identify the atom that increases in oxidation number in the following redox reaction. 2MnO2 + 2K2CO3 + O2 2KMnO4 + 2CO2 *A.) Mn B.) O C.) K D.) C Please show work Thank you.
*March 21, 2013*

**Spanish: check answers**

Ms. Sue the answers are right under 19, It says answers and I listed my them. Thank You MathMat.
*March 21, 2013*

**Spanish: check answers**

Questions: 3. Paella is a dish like tacos. a dish made of rice, seafood, and vegetables eaten in Spain. another name for enchiladas. 4. Fast-food restaurants in the Spanish-speaking world are generally very popular with adults. look similar to the ones in the United States and...
*March 21, 2013*

**Us History**

How did social responsibility of businesses change during the Great Depression era?
*March 5, 2013*

**Calculus**

Determine convergence or divergence for the following series. State the tests used and justify your answers. Sum (infinity, n=1) 1/(1+e^-n) Sum (infinity, n=1) (2*4*6...2n)/n! Sum (infinity, n=0) (n-6)/n Sum (infinity, n=0) (n-6)/n! Sum (infinity, n=0) (100n^14)/4^n
*March 4, 2013*

**Calculus**

Determine convergence of divergence. If convergent, find the sum. Sum (infinity, n = 0) (e/pi)^n
*March 4, 2013*

**Spanish 1**

Complete the sentences with the correct form of ir. todos Los Dias, yo ____ a la escuela
*February 26, 2013*

**English**

period is right
*February 12, 2013*

**math**

Which units would you use to measure the area of a rectangle with L=1m and W=34 cm? Explain
*February 12, 2013*

**math**

i write out all the whole numbers,starting from 1,If i wrote 1994 digits altogether,what was the last complete number i wrote down
*February 10, 2013*

**math**

what is the interior angle of a regular polygon
*February 10, 2013*

**math**

Write the fraction in the simplest form. 12/56: 3/30: 5/25: 9/39: 6/54: 2/100: 8/18: THANKS
*January 24, 2013*

**math**

i thought you would add?
*January 16, 2013*

**math**

Jeremy collected nickels for one week. He is making stacks of his nickels to determine how many he has. The thickness of one nickel is 1/4 in. How tall is a stack of 4 nickels? 3 nickels, 2 nickels?
*January 16, 2013*

**Math**

Is yo last name akres/ acres, or Whatever.
*January 14, 2013*

**Science, Heat Transfer**

someone please help me!
*January 14, 2013*

**Science, Heat Transfer**

list 3 forms of radiation from the sun. how are they alike. how do they differ?
*January 14, 2013*

**math**

infinite
*January 14, 2013*

**math please help imedietely**

if for one row she needs 3red 6yellow and 3white, then for 8rows, 8x3 8x6 and 8x3= 24, 48, 24. :)
*January 14, 2013*

**its urgent math i need the answer fast**

first how many units?
*January 14, 2013*

**5 th grade math**

D.
*January 10, 2013*

**Algebra 1**

40 bicycles
*January 9, 2013*

**Geometry**

a baseball diamond is a square 27 cm on a side. how far is the homeplate from the second base?
*January 4, 2013*