# Matthew

Popular questions and responses by Matthew-
## math

Burj Khalifa is the world tallest building in Dubai at 828 m tall. The CN Tower in Toronto is 553 m tall. Sam wants to compare the Burj Khalifa and the CN Tower by creating rectangular prism models on a 10 cm by 10 cm square base. She has decided to

*asked on January 15, 2013* -
## world history

What impact did the Silk Road have on Marco Polo’s expeditions to the Mongolian Empire? Marco Polo traveled the Silk Road to reach Mongolia but the path was too treacherous and led to Polo’s death. Macro Polo used the Silk Road to reach the Mongolian

*asked on November 29, 2018* -
## calculus

find an equation of the curve that satisfies dy/dx=4x^3y and whose y-intercept is 7

*asked on March 19, 2011* -
## Theoretical&Experimental Probability please help!

Please check my work thanks!! A number cube with the numbers 1 through 6 is rolled. Find the given probability. 1. P(number < 2) (1 point) A. 1/6

*asked on March 6, 2013* -
## English

What is the sentence pattern for: The waterfall rushed down the steep hillside. options: s-v-io-do s-lv-pa e-v-s s-lv-pn s-v-do s-v-do-oc quest pattern s-v

*asked on August 18, 2012* -
## English

A few more things.Thank you. “Why don’t we go to the seaside for the weekend?” he asked (us). He proposed going to the seaside. He proposed that we should go...(??) Can you tell me if the names below are female or male names? Thank you. Helen (F)

*asked on April 1, 2012* -
## Mathematics

In a class of 50 students, the number of students who offer Accounting is twice as the number who offer Economics. 10 students offer neither of tsubjecs the two subjects. I. Illustrate the information on a Venn diagram. II. How many students offer

*asked on October 8, 2019* -
## math

A car skids to a stop, leaving four skid marks with an average length (D) of 60 feet. The road is asphalt. Skid tests reveal a drag factor(f) of 0.75. Since all four wheels were braking, the braking efficiency (n) is 100% or 1.00. To the nearest mile per

*asked on October 2, 2018* -
## Physics

Please help me out, I can't figure out the process for answering this question and my TA is of no help, A 0.11- ball is placed in a shallow wedge with an opening angle of 130 degrees,for each contact point between the wedge and the ball, determine the

*asked on October 7, 2009* -
## Math

Chris Shopper received a $800 discount loan to purchase a washer and dryer. The loan was offered at 10% for 120 days. What are the proceeds? I tried this problem and the answer is not 26.40

*asked on June 24, 2013* -
## integrated science

please help me If the following elements were involved in a chemical reaction, which one would be most likely to form a cation? chlorine (Cl) nitrogen (N) potassium (K) fluorine (F) I think it is A.

*asked on December 19, 2018* -
## Chemistry

What is the molar mass of toluene if 0.85 g of toluene depresses the freezing point of 100 g of benzene by 0.47 degrees celsius? Kf= 5.12 C/m

*asked on May 6, 2016* -
## math

You backpacked for a distance of 15.75 miles today. If you backpacked at an average speed of 1.26 miles per hour, how many hours did you spend backpacking today?

*asked on April 29, 2019* -
## PreCalculus

Convert 2 e^{\pi i/6} to rectangular form.

*asked on June 28, 2020* -
## English

“She asks my name, and when I tell her she hoots, ‘Barbara Bush!’ Despite my vigorous protestations, the joke is repeated twice during the breakfast service.” Why is it, most likely, that Barbara Ehrenreich protested “vigorously” to the joke

*asked on January 13, 2019* -
## Please help check physical science!

Please help check my answers I really want to make a 100%! 1. A mechanical wave moves through a medium, which can be (1 point) A. a liquid. B. a solid. C. a gas. D. all of the above

*asked on March 6, 2013* -
## Math

solve for x 2^x=0.125 5^2x=39 13^x=27

*asked on February 1, 2012* -
## Statistics

a)One game in a state lottery requires you to pick 1 heart, 1 club, 1 diamond, and 1 spade, in that order, from the 13 cards in each suit. What is the probability of getting all four picks correct and winning $5000 b)If three of the four selections in part

*asked on November 8, 2010* -
## Chemistry

Doing some homework, are my answers right? HCN= Polar HCOOH= Polar H2CCCH2= Nonpolar Out of the following elements: Na, H, and Au order them least to greatest in the following: Eletronegativity= Na is smallest, H is second, Au is largest Ionization Energy=

*asked on April 3, 2014* -
## Physics

Bernie drove home from a vacation in 1.5 hours. He traveled a total distance of 60 miles. What was his average speed in miles per hour?

*asked on September 6, 2012* -
## Physics

When jumping, a flea reaches a takeoff speed of 1.5over a distance of 0.45. A.) What is the flea's acceleration during the jump phase. B.) How long does the acceleration phase last?

*asked on September 5, 2012* -
## English

Can you check if everything is OK in my rephrase of Owen's poem? 1) In the first stanza the soldiers are retreating towards their trenches. Instead of being youthful, strong fighters, they are presented as prematurely old and weak. 2) They are bent over

*asked on March 28, 2012* -
## differentiability

If g is a differentiable function such that g(x) is less than 0 for all real numbers x and if f prime of x equals (x2-4)*g(x), which of the following is true? A. f has a relative maximum at x=-2 and a relative minimum at x=2, B. f has a relative minimum at

*asked on December 31, 2010* -
## Geometry

Does a regular nonagon have point symmetry? I know it has rotational symmetry but I am not sure if it would work for point symmetry I think I would.

*asked on November 21, 2018* -
## math

to which subset of real numbers does the number -22 belong?

*asked on September 12, 2017* -
## Equation

Four times a number, increased by 25 is 13 less than 6 times the number. What is the number? 4n+25=-13-6n. ???

*asked on September 11, 2013* -
## Math

Tim wants to model a doll house from a real house that measures 60 feet in length by 28 feet in width. He decides to use a scale in which ¼ inch equals 1 foot. Based on this scale, What will be the length of the longer side of Tim's model? inches What

*asked on June 25, 2013* -
## Math

A vehicle covers 2,160 miles in 5.5 hours. What is the average speed of the vehicle to the nearest tenth. I got 55.5, but I don't think it is correct.

*asked on June 25, 2013* -
## algebra

The height above the ground of a ball thrown up with a velocity of 96 feet per second from a height of 6 feet is 6+96t-16^2 feet, where t is the time in seconds. According to this model, how high is the ball after 7 seconds? Explain (Thank you in advance!

*asked on May 4, 2011* -
## English

(Nickel and Dimed) Ehrenreich’s experiences with low-wage workers revealed to her that in general, these workers treat each other A. as competition for higher-level jobs within the company B. as professionals who can help each other gain success C. with

*asked on January 13, 2019* -
## Math

A submarine at -28 feet dives 40 feet. What is the submarine's elevation after the dive?

*asked on October 23, 2016* -
## Math

Suppose that a wind is blowing in the direction S45°E at a speed of 50 km/h. A pilot is steering a plane in the direction N60°E at an airspeed (speed in still air) of 150 km/h. The true course, or track, of the plane is the direction of the resultant of

*asked on September 14, 2015* -
## Pre-calc

There exist constants a, b, c, and d such that(sin x)^7 = asin 7x + bsin 5x + csin 3x + dsin x for all angles x. Find d. I tried rewriting them in the exponential form, but it becomes ugly as there are many negative cosines and divisions of i. Help?

*asked on April 7, 2015* -
## Chemistry Need Help

Given the chemical equation, Cl2 + F2 2ClF, how many moles of ClF are produced in the reaction, if 1.50 moles Cl2 are made to react with 1.75 moles F2 ? I got the answer 3.50 moles but it was wrong. Can anyone help me please.

*asked on February 27, 2015* -
## Operations with Fractions

Darion needs 20 pieces of string 3/8 inch in length. He cut a 4 7/8 inch piece of string into pieces that are 3/8 of an inch long each. How many more pieces of string of string does he need?

*asked on November 15, 2014* -
## Algebra

A petroleum company has two different sources of crude oil. The first source provides crude oil that is 35% hydrocarbons, and the second one provides crude oil that is 60% hydrocarbons. In order to obtain 120 gallons of crude oil that is 55% hydrocarbons,

*asked on October 22, 2012* -
## English

Writeacher, I downloaded a few details about modals expressing possiblity/probabity but I'm still doubtful about their use. My questions to you are numbers 1-2. Using modals to talk about the present: 1)Will / won't We use will and won’t when we are very

*asked on April 19, 2012* -
## English

Writeacher, I'm finding it difficult to check these sentences, which need to be revised grammatically. 1) The Tempest is the last one of Shakespeare’s plays. It’s very different from his previous ones. In fact it is not a tragedy, like Macbeth or

*asked on April 10, 2012* -
## English

Writeacher, I need your help to check a few things. Thank you. 1) At the first time Clare didn't say if she was free, but the next day she confirmed she was able to go to the cinema. (Can you check this sentence for me?) 2) I would like to enrol at the

*asked on March 22, 2012* -
## English

I forgot to add the following data. Thank you very much. 1) You should make a short list of the job requirements before going for the interview. 2) There is nothing wrong with pulling out the paper with the company’s data on during the interview. 3) You

*asked on March 15, 2012* -
## Math

Mr. Clarkson and Mrs. Rose had an average of $180. After Mr. Clarkson spent $73 and Mrs. Rose received $38 from her father, Mr. Clarkson had 1/4 as much money as Mrs. Rose. How much money did each have at first?

*asked on February 14, 2012* -
## Physics

An electric motor rotating a workshop grind- ing wheel at a rate of 147 rev/min is switched off with a constant deceleration of 1.24 rad/s2. How long does it take for the grinding wheel to stop? Answer in units of s Through how many radians has the wheel

*asked on December 6, 2011* -
## math

find the volume of the rectangular prism: base area 56 in2, height 6 inches

*asked on January 31, 2011* -
## Social Studies

I am presently creating a unit about land transportation in the community and how these transportations affect our daily lives eg. taxi, garbage truck, train etc. Do you have any ideas or suggestions for a fun lesson plan.... do you have any websites that

*asked on March 28, 2008* -
## Chemistry; to drwls or drbob

i think i have posted this before except i forgot to put the decimal in the temperature. i was hoping you could help me now that it might make more sense. The total pressure in a flask containing air and ethanol at 25.7 C is 878 mm Hg. The pressure of the

*asked on February 4, 2008* -
## Algebra

A woman is 43 years old, and her daughter is 15 years old. How many years will it be before the woman’s age is just twice her daughter’s?

*asked on September 28, 2019* -
## Math

X+ 13/x=8/3

*asked on May 25, 2018* -
## Maths

Two concentric circles are such that one circle has half the radius of the other. If a point is chosen at random inside the larger circle, the probability that it also lands outside the smaller circle is?

*asked on November 21, 2017* -
## Math

The smaller angle between the hands of a clock at 8:43 is what?

*asked on October 25, 2017* -
## Chemistry

Potassium superoxide, KO2, is used for producing oxygen and removing carbon dioxide in selfcontained breathing units, space shuttles, and other enclosed spaces. First the potassium superoxide reacts with moisture to release oxygen and produce potassium

*asked on October 15, 2017* -
## Chemistry

A mixture of KCr(SO4)2 and its hydrate KCr(SO4)2•12H2O has a mass of 1.6336 g. After heating to drive off all the water, the mass is only 1.4659 g. What is the weight percentage of KCr(SO4)2•12H2O in the original mixture? Report your answer to 4

*asked on October 10, 2017* -
## pre calc

write the equation in the slope-intercept form 8x − 3y + 6 = 0

*asked on January 4, 2017* -
## Ecology

an endemic species is best defined as a species that

*asked on June 5, 2016* -
## Physics

A charge of -5.02 μC is traveling at a speed of 8.86 × 106 m/s in a region of space where there is a magnetic field. The angle between the velocity of the charge and the field is 54.6o. A force of magnitude7.85 × 10-3 N acts on the charge. What is the

*asked on May 17, 2016* -
## Functions, graphs

f(x)=(x+1)/(1+x^2) a) explain why the graph lies above the x axis on the interval x=0 and x=sqrt(3) b)write an expression using the indefinite integral that gives the area between the graph f and the x axis between the values x=0 and x=sqrt(3). c)use

*asked on March 5, 2016* -
## Algebra

If x varies directly as y and x=9 when y=2 find x when y is 6

*asked on November 24, 2015* -
## math

A cyclist covers his outward journey downhill at 24mph. His return journey, over exactly the same distance uphill, is covered at only 12mph. What is the cyclist's average speed over the entire journey?

*asked on March 5, 2015* -
## Math

In triangle ABC, the degree measure of angle A is 20 degree greater than the degree measure of angle B. Angle C is a right angle. What is the measure of angle B? Is it 70 degrees. 90-20=70

*asked on January 28, 2015* -
## Chemistry

What is the difference between Citric Acid C6H8O7 and H3C6H5O7? I am seeing both and don't know which is the right one. Is one a solution of citric acid? Thanks

*asked on September 29, 2014* -
## math

Area of a rectangle = 221 m2; width = length = ? Should the answer be 13 or or 26

*asked on September 2, 2014* -
## Physics

Two boys are pulling a box across a horizontal floor as shown in the figure below. vector F 1 = 50.0 N and vector F 2 = 100 N. (a) Find the resultant (or sum) force by the graphical method. (b) Find the resultant (or sum) force by the component method.

*asked on August 25, 2014* -
## Math

Thank you for the answer now I understand. For the next question I made a mistake this is the question elli has two 8 and 1/2 pound bags of mints. She plans to put 1/12 pound at each place setting. Will she have enough mints? She has 256 guests I think

*asked on December 11, 2013* -
## Physics

An unmarked police car traveling a constant 80km/h is passed by a speeder traveling 135km/h. Precisely 3.00s after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 1.50m/s^2 , how much time passes before

*asked on October 6, 2013* -
## Chemistry

Calculate delta G of a reaction with equilibrium constant, K= 9.5 x 10^5 at 25 degrees C

*asked on July 10, 2013* -
## Math

Tim wants to model a doll house from a real house that measures 60 feet in length by 28 feet in width. He decides to use a scale in which ¼ inch equals 1 foot. Based on this scale, What will be the length of the longer side of Tim's model? inches What

*asked on June 25, 2013* -
## Math

How do you find the price of each share if 700 shares of stock are sold for $55.00 ?

*asked on May 5, 2013* -
## math

I asked the following the other day and received the following answer: Posted by Matthew on Sunday, March 17, 2013 at 11:03pm. A quantity of oxygen gas had 16.32 g of the radioactive isotope oxygen-19 in it. When measured exactly 10 minutes later, the

*asked on March 18, 2013* -
## math

A quantity of oxygen gas had 16.32 g of the radioactive isotope oxygen-19 in it. When measured exactly 10 minutes later, the amount of oxygen-19 was 0.964 g. What is the half-life, in seconds, of oxygen-19?

*asked on March 17, 2013* -
## Science

a 5-kilowatt source powers a motor that is lifting a 30 kg mass straight up. how far will the mass move in 6 seconds

*asked on February 14, 2013* -
## Chemistry

What is the half-life of a 100.0 g sample of nitrogen-16 that decays to 12.5 g of nitrogen-16 in 21.6 s? Please help me!!

*asked on December 11, 2012* -
## Chemistry

A photocell is a device used to measure the intensity of light. In a certain experiment, when light of wavelength 530 nm is directed on to the photocell, electrons are emitted at the rate of 5.1 10-13 Coulombs/sec. Assume that each photon that impinges on

*asked on September 23, 2012* -
## Physics

A juggler throws a ball straight up into the air with a speed of 20. With what speed would she need to throw a second ball half a second later, starting from the same position as the first, in order to hit the first ball at the top of its trajectory?

*asked on September 5, 2012* -
## Math

Compare. write >,

*asked on June 27, 2012* -
## English

I retyped the first part considering your corrections. Can you check if it is OK now? Thank you very, very much. 1) Mr. Otis buys Canterville Chase from Lord Canterville. After that, Mr Otis drives with his family to Canterville Chase. When they arrive

*asked on April 18, 2012* -
## English

I urgently need you to check this paragraph. Thank you, Writeacher. 1)Henry II was successful in bringing order and stability. 2) To avoid civil wars, he needed to reduce the power of the barons and wanted professional soldiers (mercenaries) to do this.

*asked on April 16, 2012* -
## English

I left out two exercises for you to check. Thank you very much, Writeacher. By the way, do you say "talk about a topic of your choosing/or of your choice? 1) I ……………………… buy any butter, mum has just bought some. (Shall I include a colon

*asked on April 16, 2012* -
## English

Here is the second exercise. Thank you very much for the revision. 1) John ……………………… buy the dictionary for the exam: he can take mine. 2) You ………………………stand on the left on the escalators. 3) I

*asked on April 16, 2012* -
## English

Can you check if the various exercises are all possible? Thank you, Writeacher. Here is exercise 1. •1) The new German teacher (arrive) _______on Tuesday, for his first lesson. 2) On Saturday night we (meet) _______our friends in the square at 3

*asked on April 16, 2012* -
## English

Can you please check the sentences? Thank you, Writeacher. 1) Are there any questions before you start? Did you have any difficulty in doing your homework? 2) Take a photocopy and pass the others on. Share these copies, one between two. Please, keep an eye

*asked on April 16, 2012* -
## English

Can you please check these instructions, Writeacher. Thank you very much. English remedial test 1) Complete the following sentences with must/mustn’t, have to, don’t have to, should/shouldn’t 2) Fill in the correct future form (will future, going to

*asked on April 16, 2012* -
## English

Can you please check these sentences on history, please? Thank you, Writeacher. 1) In the 8th and the 9th centuries Scandinavian invaders, known as the Vikings, attacked the monasteries and villages near the water and robbed them. 2) King Alfred the Great

*asked on April 8, 2012* -
## English

I left out the following sentences. Can you please check them? I hope they are the last on the same subject. I really rely on your invaluable help. 1) Caliban feels like a slave. He has o obey Prospero's orders because of Prospero's magic powers. There is

*asked on April 8, 2012* -
## English

I left out the following sentences. Thank you very much. 1) The Tempest is the last one of Shakespeare’s plays and it’s very different from his previous ones. In fact it is not a tragedy, like Macbeth or Hamlet, but a romance based on forgiveness and

*asked on April 7, 2012* -
## English

I urgently need you to check these sentences. Thank you very much. 1) “Pamela” is an epistolary novel, that is a collection of letters written by a virtuous girl, Pamela Andrews, to her parents. The plot is very simple and built around the

*asked on April 4, 2012* -
## English

Just a question. If you had to write this sentence in the second conditional: If the weather is bad, I won't go out. If the weather was/were bad, I wouldn't go out

*asked on March 28, 2012* -
## English

Writeacher, I urgently need you to revise the introductory part of Chapter 10 (Dr Jekyll and Mrs Hyde). Can you check tenses,please? 1) In Chapter ten Dr Jekyll comes to the realization of the primitive duality of man. He admits that man is not truly one

*asked on March 18, 2012* -
## statistics

Times for a surgical procedure are normally distributed. Method A has a mean of 28 minutes and a standard deviation of 2 minutes for completion. What is the probability that a surgical procedure conducted by method A takes at most 33 minutes to complete?

*asked on March 17, 2012* -
## Chemistry

I need some help with some of these questions: The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name implies, it stinks! It is 58.77 percent carbon, 13.81 percent hydrogen, and 27.40 percent nitrogen. Its

*asked on February 20, 2012* -
## Math

Determine the values of x for which the function f(x) = 3/(√x^2+3x-4) is continuous.

*asked on February 10, 2012* -
## Chemistry

An aqueous solution of copper (I) chloride is 15.7% by mass copper (I) chloride. Copper (I) is 35.8% by mass chlorine. If the solution has a density of 1.045 g/cm³, how many gallons of solution contain 2.3 kg of copper?

*asked on October 8, 2011* -
## Chemistry

I need to know how to right a net ionic equation for the following chemical reaction: 5 H2C2O4 + 3 H2SO4 + 2 KMnO4 = K2SO4 + 2 MnSO4 + 8 H2O + 10 CO2

*asked on April 14, 2011* -
## Geometry

The sum of the measures of the angles of a polygon with n sides is given. Find n. 32) 180 33) 1080 34) 1980 35) 2880

*asked on March 17, 2011* -
## History

would an Egyptian style revolution beneficial or detrimental to the US government?

*asked on February 22, 2011* -
## 6th grade

What are the d themes of geography ,

*asked on October 17, 2010* -
## science

an unknown metal has a volume of 20cm^3 and a mass of 54g. Identify the metal

*asked on April 11, 2010* -
## math

I wrote my question wrong. It should be write 25000000 in expanded notation using the power of 10

*asked on March 7, 2010* -
## Physics

A spring has a spring constant of 259N/m. Find the magnitude of the force needed (a) to stretch the spring by 3.54 10-2m from its unstrained length and N (b) to compress the spring by the same amount. N

*asked on November 17, 2009* -
## Chemistry

A silver bar has mass of 368g. What is the volume, in cm^3, of the bar? the density of silver is 19.5 g/cm^3.?

*asked on October 11, 2007* -
## Chemistry

The diamenter of a carbon atom is 77 pm. Express this measurement in um?

*asked on October 11, 2007* -
## Substitution Method in Algebra!HELP PLZ!

Use the Substitution method to solve the system of equations. 3x + y = 5 4x - 7y = -10 multiply first equation by 4 multiply second equation by 3 thus both equations have same x or y value in this case it is the x value. 12x + 4y = 20 12x - 21y = -30 solve

*asked on November 5, 2006*