Thursday
May 5, 2016

Posts by Matthew

Total # Posts: 642

Math
hey
May 23, 2013

Math
prove identity Sin2x - sinx/cosx + cos2x= sinx/cosx + 1
May 19, 2013

Language
Read the poem and answer the questions that follow 1.There once was a cowboy named Ray 2. Who never had that much to say, 3. Except for the times 4. Stampedes stopped on a dime 5. When that cowboy named Ray hollered Hey 1.in which lines do you see repetition? 2. What is the ...
May 10, 2013

Math
Yes, I copied it correctly. I was wondering too. Thank you for your help
May 5, 2013

Math
How do you find the price of each share if 700 shares of stock are sold for $55.00 ?
May 5, 2013

Math ASAP please
#1 is p = 0.20k + 100. #4 is correct.
April 19, 2013

Math
crap, i screwed up writing my answers. Ignore them please.
April 7, 2013

Math
So I have a question regarding advanced functions, logarithm stuff. here is the question: Beginning with the function f(x) = log[base(a)]x ,state what transformations were used on this to obtain the functions given below: a) p(x) = -(5/8) log [base(a)]x b) r(x) = log[base(a)](...
April 7, 2013

Calculus-Inverse Functions
is the inverse function of x+ floor(x) equal to x - floor (x/2) i got this after plotting points but i'm not sure. thank you
March 31, 2013

Calculus
The continuity of floor functions the function: x - floor(x) it is continuous on what interval? i got all real numbers except for integers. is this right. thank you.
March 31, 2013

math
but why the choice for ln?
March 18, 2013

math
nevermind on 2), i would appreciate an asnwer to 1) though
March 18, 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 amount of oxygen-19 was 0...
March 18, 2013

math
The value, V, of a $25000 vehicle after y years is given by V = 25000 (0.85)y What is the rate of depreciation? (1 mark) What will the car be worth after 5 years? (1 mark) To the nearest month, how long would it take to reduce the vehicle’s value to 10% of its original ...
March 17, 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?
March 17, 2013

Chemistry
An experiment requires 0.7 M NH3(aq). The stockroom manager estimates that 15 L of the base is needed. What volume of 15 M NH3(aq) will be used to prepare this amount of 0.7 M base?
March 8, 2013

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 <-- This one 2. Which type of kind of wave causes the medium to vibrate only in a direction ...
March 6, 2013

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 <--- i think this one B. 2/6 C. 4/6 D. 3/6 2. P(number ≥ 3) (1 point) A. 4/6 B. 1/6 C. 2/6 <-- this i think D. 5/6 ...
March 6, 2013

Math
It would be less then the World because of the international and if you add the cost of how much it is the answer shows you that it's less.
March 2, 2013

Algabra 1
A) {7, 6, 5, 3} B) {7, 6, 5, 4} C) {-7,-6,-5,3} D) {-7,-6,-5,4}
February 26, 2013

algebra
real world situation a problem describing incresing then constant and finally decreasing
February 19, 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
February 14, 2013

math 5th
help
February 12, 2013

Soc. Studies
1.D 2.A 3.C 4.C
February 11, 2013

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 represent the Burj Khalifa ...
January 15, 2013

Computer
More than likely the computer requires more memory.
January 10, 2013

Math
Several friends are taking turns flying a kite. Each friend flies the kite for the same amount of time. They spend 6 hours flying the kite altogether. Explain what information you need to find how long each friend flew the kite for.
January 7, 2013

Chemistry
A 208 g sample of sodium-24 decays to 13.0 g of sodium-24 within 60.0 h. What is the half-life of this radioactive isotope?
December 11, 2012

Chemistry
All isotopes of technetium are radioactive, but they have widely varying half-lives. If an 800.0 g sample of technetium-99 decays to 100.0 g of technetium-99 in 639,000 y, what is its half life
December 11, 2012

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!!
December 11, 2012

TRIGONOMETRY
Write the following trigonometric expression as an algebraic expression in x free of trigonometric or inverse trigonometric functions sin(cos^-1 x) -1≤x≤1
December 4, 2012

math
3.56kg = G
November 27, 2012

Chemistry
16. n^2= number of orbitals
November 18, 2012

Chemistry
dE= -Rh((1/nfinal^2)-(1/ninitial^2)) Rh is a constant = 2.178E^-18
November 18, 2012

Chemistry
never mind, I figured it out.
November 18, 2012

Chemistry
Air bags are activated when a severe impact causes a steel ball to compress a spring and electrically ignite a detonator cap. This causes sodium azide (NaN3) to decompose explosively according to the following reaction. 2 NaN3(s)--> 2 Na(s) + 3 N2(g) What mass of NaN3(s) ...
November 18, 2012

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, how many gallons of ...
October 22, 2012

Physics
In reply to Jennifer, her explanation is CLOSE to be correct. Instead of converting rpm to rps, convert it to rad/s and use that as the velocity. To do this, multiply the rpm by 2π and then divide by 60. Use that and the radius in the formula then divide by 9.8 and you ...
October 3, 2012

chemistry
A set of bookshelves rests on a hard floor surface on four legs, each having a cross-sectional dimension of 3.9 6.5 cm in contact with the floor. The total mass of the shelves plus the books stacked on them is 260. kg. Calculate the pressure in pascals exerted by the shelf ...
September 30, 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 the photocell emits ...
September 23, 2012

Physics
i.imgur. com/cqwun. png i'm kind of stuck.. are the answers 6, -3, -3, and 0?
September 11, 2012

math
how do you find the % on a spinner?
September 10, 2012

math
What is the compatible estimation for 329 + 64
September 9, 2012

Physics
i.imgur. com/VWFwb. png
September 9, 2012

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?
September 6, 2012

Physics
A "rocket car" is launched along a long straight track at = 0 . It moves with constant acceleration = 2.5 . At = 3.0 , a second car is launched with constant acceleration = 8.7. At what time does the second car catch up with the first one? How far have the cars ...
September 5, 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?
September 5, 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?
September 5, 2012

Math
What are two ways to read x/16?
September 4, 2012

math
1. A year on earth is 365 earth days so a year on mars would be longer. 2. 686-365= 321 days longer 321 days divided by 7 days in one week = 45.857 weeks longer.
September 4, 2012

math
500
August 29, 2012

Math
Oh, nevermind. Found it. The answer is 721 eggs...
August 28, 2012

Math
Can anyone help?
August 28, 2012

Math
Well, the thing is, the problem says that only one eggs is left over, but, four has three extra, and five has one extra... I'm throughally confused...
August 28, 2012

Math
That helps but I need a little more help than that...
August 28, 2012

Math
I have to figure out how to do this problem. I don't have the slightest idea how to even begin it, so if you can lead me through it, step by step, I would be very grateful. A woman is walking home with eggs in her bag. Suddenly, a car comes speeding towards her. She jumps ...
August 28, 2012

Algebra
algebraic expression for the sum of twice a number squared and 7
August 23, 2012

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
August 18, 2012

Science - Chemistry
What happens when you mix Sodium Bicarbonate, Bromothymol blue, and Calcium Chloride? What is Bromthymol blue used for in this experiment?
August 17, 2012

Math
Compare. write >, <, or= 2/5 4/5 7/10 3/5 1/2 4/7
June 27, 2012

Please help!- science
how do nerve fibers in the brain send messages
May 23, 2012

Math
first three terms of a geometric sequence are the same as the 1st, 9th and 11th terms of an arithmetic sequence, respectively. What is the common ratio in the geometric sequence ? Thanks!
May 12, 2012

Science please help!
A lamp connected to a battery lights up. If a second, identical lamp is connected to the battery in parallel, the current drawn from the battery will _____ , and compared to the original brightness of the first lamp, both lamps will be _____ . will the current increase and ...
May 12, 2012

Science!
Always forms virtual images at the same distance behind the optic as the object is in front of it. I thought it was concave but im not sure if concave lens form a virtual images when its infront of the optic
May 12, 2012

math
change .7 to hundreds
May 2, 2012

English
Thank you very much, Writeacher. I need to revise these sentences, too. 1) I was last proud of myself when I helped one of my friends one week ago. She lost her father after a tragic accident (better: in) and I'm currently supporting her emotionally. 2) I often blamed (...
April 21, 2012

Physics
A car is initially traveling at 20 m/s when it accelerates to 35 m/s in a time of 5 seconds. What is the acceleration of the car in m/s^2?
April 20, 2012

English
Here are other sentences I need to check. I really hope you can check them, Writeacher. 1) blamed my friend Peter for breaking some plates, but the real guilty was me. I’m quite independent of my parents because I do a lot of things without their help. 2) I’m not ...
April 20, 2012

English
I urgently need to revise a few sentences containing reflexive pronouns. I really hope you can help me. 1) I was last proud of myself when I won a swimming competition. I (once) blamed one of my friends for telling me a lie. 2) I depend on my parents. I’m still dependent ...
April 20, 2012

English
Yes, it does make sense. Blasè means uninterested. Could you please check if everything is OK as I made a few changes? Thank you very much! 1) Mr. Otis buys Canterville Chase from Lord Canterville. After that, Mr. Otis drives with his family to Canterville Chase. 2) ...
April 19, 2012

English
Writeacher, what does "blasè" mean? Example: I was getting a bit blasè by the time I had my last interview. I still need to check a sentence. Thank you very much. 1) Speaker 2 believes that appearance is important when going for an interview. For this ...
April 19, 2012

English
Writeacher, I downloaded a few details about modals expressing possibility/probability 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 sure...
April 19, 2012

English
Sorry, for asking you the same thing again, but I really don't know if I have to leave these two sentences as they are. 1. I have already been at school today. 2. I have already been to school today. (Is there a difference between them?) 3.I haven't been to the cinema ...
April 19, 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 sure: &#...
April 19, 2012

English
I left out a sentence. Thank you very much, Writeacher. I haven't had my chess lesson yet. I haven't done my chess lesson (is a mistake). Can you suggest a site with exercises on the use of modals to express degrees of probabilities?
April 19, 2012

English
Writeacher, I really hope you can have a look at my last examples. I need to know which are wrong. I still have a few doubts on the use of to/at/in after have been. Thank you for helping me. 1) I haven't gone out for a walk. I have already been to school (or at school) ...
April 19, 2012

English
I still have a few doubts on the use of to/at/in after have been. Thank you for helping me. 1) I haven't gone out for a walk. I have already been to school (or at school) today. I haven't been to the cinema yet today. 2) I've already gone shopping online. I've ...
April 19, 2012

English
I still have a few doubts on sentences you checked yesterday. 1) I did/had/went for an interview. (Is "do" possible?) 2) I've just taken (done is a mistake) a grammar test. 3) I've just been tested orally in English. 4) I haven't taken an oral English ...
April 19, 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 there, Mrs. Lucretia ...
April 18, 2012

English
Thank you, very much. Here is the second part. I will post you the whole summary again after your correction. 1) Mr Otis’s daughter, Virginia, finds the ghost and he talks to her about his story. Virginia takes the ghost seriously and decides to help him. 2) The last part...
April 18, 2012

English
Writeacher, I urgently need you to check this paragraph. I really hope you can help me. As it is a short summary of Wilde's Canterville Ghost, I think it should be in the present. Can you suggest a site containing a simple and concise summary of the story? 1) Mr. Otis ...
April 18, 2012

English
I have a few questions on sentences I wrote last week. Could you please check them? 1) In the summary of Gulliver's travels I used the present but a few sentences are in the past. 2) When Gulliver comes back home in England, his wife and his other family members welcome ...
April 18, 2012

English
Writeacher,could you please check if everything is Ok. Thank you very much for your invaluable help! 1) Swift was born in Ireland of English parents. He was also educated there and he became a priest. 2) He left Dublin for England in 1689 to reside (stay at?) at the household ...
April 18, 2012

English
I left out the following statements. Thank you very much. 1) All of his works are characterized by his polemical genius, expressed in various literary genres. 2) The first pamphlet to bring Swift fame was the Battle of the Books, where he imagines a battle between the books of...
April 17, 2012

English
Can you please check these sentences on Jonathan Swift's life? Thank you, Writeacher. 1) Swift was born in Ireland of English parents. He was also educated there and he became a priest. 2) He left Dublin for England in 1689 to reside (stay at?) at the household of William ...
April 17, 2012

English
Thank you very much, Writeacher. I left out the following sentences. 1) I still haven't got asleep even if it is almost 2 am. 2) I've already seen Almost Friends with my best friend. 3) I haven't visited the town museum yet. 4) I have just arrived from the studio ...
April 17, 2012

English
I left out these sentences which are more or less the same but I need to know which are possible. Thank you very much. 1) I'm the singer in the music (is musical possible?) band The Boyz. 2) I'm the singer in the band, the Boyz. I'm the singer in the band called ...
April 17, 2012

English
I urgently need you to check these sentences on the present perfect. Thank you. 1) I've just come back from the studio where we were rehearsing/practising(exercising/training are mistakes?).Is "we practised" possible? 2) I still haven't spent my time ...
April 17, 2012

English
I left out two sentences.Thank you very much, Writeacher. 1) ...... you ever ...... to lend him your book? Have you ever had to lend him your book? also 2) Do you ever have to lend him your book? I don't have to buy any butter (also I won't have to buy any butter: mum ...
April 17, 2012

English
I have a few further doubts. Thank you very much for the help. 1) I sent her two emails last week, but he hasn't replied to any of them. (I think both the simple past and the past perfect are acceptable). 2) How long does it take him to drive to wrok? 3) Why was she ...
April 17, 2012

English
I left out the following sentences. Thank you very much, Writeacher. 1) This is the first time I’ve flown in an aeroplane. The child slept from eight till eight without waking one. I’ve known Mary since last month. 2) We sent John three emails last week, but he didn...
April 17, 2012

English
Writacher, I urgently need you to check these sentences. Thank you very much. 1.The new teacher arrives on Tuesday for his first lesson. 2.We are meeting our friends in the square at 3 o’clock and then we are going to the disco together. 3.Tomorrow it will be rainy. 4.He...
April 17, 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. 3)Many knights did not ...
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 ...
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...
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 o’clock and then we (...
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 on time. 3) Let'...
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 future, ...
April 16, 2012

English
I left out a last thing about the comprehension. Thank you very much Writeacher. 1) Paradoxically, Amnesty is an organization that will only be satisfied when it has become redundant. Meaning: Amnesty will go on working until its work becomes unecessary. (TRUE) 2) Synonyms: ...
April 15, 2012

English
I still have a sentence on the listening comprehension for you to check. Thank you. 1) It fights for the release of people imprisoned for racism and political prisoners. 2) Its local groups operate by collecting information about prisoners, and then make (making) pressure on ...
April 15, 2012

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