Posts by Matthew

Total # Posts: 731

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

algebra
real world situation a problem describing incresing then constant and finally decreasing

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

Soc. Studies
1.D 2.A 3.C 4.C

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 ...

Computer
More than likely the computer requires more memory.

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.

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?

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

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!!

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

math
3.56kg = G

Chemistry
16. n^2= number of orbitals

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

Chemistry
never mind, I figured it out.

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) ...

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 ...

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 ...

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 ...

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 ...

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

math
how do you find the % on a spinner?

math
What is the compatible estimation for 329 + 64

Physics
i.imgur. com/VWFwb. png

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?

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 ...

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?

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?

Math
What are two ways to read x/16?

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.

math
500

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

Math
Can anyone help?

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...

Math
That helps but I need a little more help than that...

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 ...

Algebra
algebraic expression for the sum of twice a number squared and 7

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

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

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

Please help!- science
how do nerve fibers in the brain send messages

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!

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 ...

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

math
change .7 to hundreds

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 (...

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?

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 ...

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 ...

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) ...

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 ...

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...

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 ...

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: &#...

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?

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) ...

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 ...

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 ...

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 ...

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...

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 ...

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 ...

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 ...

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...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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...

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...

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 ...

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 ...

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...

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 (...

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'...

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, ...

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: ...

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 ...

English
Sorry, but the same sentences have been sent to you twice, or even three times!! I just have a question to you. 1) Amnesty fights for the release of any prisoner who opposes violence. TRUE. I thought Amnesty does not fight only for prisoners who oppose violence.

English
I left out two sentences because I'm finding it difficult to send you my post all together. 3) It is an organization that will only be satisfied when it has become redundant. Does this sentence mean that it will go on working until its work becomes unnecessary? 4) The aims...

English
I left out the following questions. Thank you very much, Writeacher. 1) First, the organization collects information. When it has proof that a person is a prisoner of conscience, it hands over that person’s case to a local group. 2)This group send (or sends?) letters to ...

English
I still have a few questions on the listening comprehension. Thank you. 1) "Amnesty works for the release of ‘Prisoners of Conscience’- men, women and children imprisoned anywhere for their beliefs, colour, sex, ethnic origin, language or religion. It also seeks...

English
Writeacher, can you help me check these sentences? Thank you very much for your invaluable help! 5)After making sure a person is a Prisoner of Conscience, the organization starts sending letters to governments and benefits (food, medicine) to the prisoner. (better: to the ...

English
Another doubt. Thank you very much for your help. 1) She said to me (she told me) that I could go to the cinema as long as I finished my homework. 2) Is "she said to me" a mistake? say is normally followed by direct speech.

English
I left out a last sentence. Thank you very much, Writeacher. He told me that I could go to the cinema provided that I finished (not I had finished) my homework.

English
I left out a few things. Thank you very much for helping me. 1) Amnesty works by collecting information. When it has a proof that a person is a 'Prisoner of Conscience', then a person's case is handed over to a local group. Question: Amnesty gathers information a) ...

English
I hope I can send you my post this time. Thank you, Writeacher. 19 He invited me to go for a motorbike ride. He requested me to go (is not possible?) He consented/agreed to drive me to the airport. 2) She said to me (she told me) that I could go to the cinema (is this sentence...

English
Can you please check these sentences? Thank you very much. 1) Write an example for each of the incorrect verbs. 2) Write an example-sentence (?) for each of the verb you made wrong. 3) You shouldn't have phoned him. (He phoned and you regret it) 4) You needn't have ...

English
I just have four more questions. Thank you very much, Writeacher. 1) He was becoming a bit blasè by the time he had his last interview. I can't remember the meaning of blasè. 2) This tells that the job candidate is interested enough to research the company. (...

English
I still have a few sentences to check. I really hope you can help me check them. I added a few more sentences. 1)I think the best thing to do is working at a passion because in this way you'll work better than anyone else. 2)You feel the need to go to work. 3) If you work ...

English
I left out these other sentences. Thank you very much, Writeacher. 1) If I'm lucky, I'll work at a passion and at the same time at a career. I think that a good job is a job that you love and that permits (?) you to do the things you are keen on. 2) I have the ambition...

English
I included a few things about correct behaviour in class. Can you please check them, too? 1) I should get top marks in all subjects. I should apply myself (fully) when in class. I should get involved in the lessons. 2) I should ask my classmates about next time's homework ...

English
I still have more sentences to check. I really hope you can revise them, too. 1) Revise all your sentences orally. 2) Bring the government down (and bring down the government) 3) He stopped to take on the students (to take the students on is possible?) 4) Mark took over the ...

English
I have some more sentences to check on the same subject.Thank you very much! 1) I took off a day because I was ill. Correction: I took a day off... Or I went sick (I took a day sick leave/I asked for a day sick leave??) 2) I would like to work at my passion because I would be ...

English
I left out two sentences. Thank you very much. 1) My father took a day off to bring (better take/drive) me to the beach. 2) She is looking through the data on her monitor.

English
I still have a few sentences to check. Thank you very much, Writeacher. 1) I would worl at a passion (my passion), because even if I know it is difficult to take off, I think that the job itself can motivate me. In fact, I'd prefer to have a job in which I can do what I ...

English
I still have to check a few other sentences on the same subject. Thank you very much in advance,Writeacher. In particular sentences 4-5-6. 1) If I work at the passion, then it is the job itself that motivates me. 2) I will take up working tomorrow. (is this sentence possible...

English
I left out the following sentences. Thank you very much, Writeacher. 1) I think everybody would work at a passion but many times (mistake) this is often not possible. 2) If I worked, I would work at a job because I'll need (I need) to put aside money for me and my family. ...

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