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Posts by Matthew

Total # Posts: 698

English
Can you please check these sentences? I forgot to include them before. I really need to check them with you. 1) My family and I have been on holiday in (to?) Greece (he has come back from Greece). We stayed on (not in) Mikonos, a little island... 2) There wasn't (any ...

English
Could you please check these other sentences, please? Thank you. 1) I’ve just been on holiday with my family. I’ve just gone on holiday with my family. 2) My nephews did some pirates’ games. If you have just come back from your holiday: I was in Spain with my ...

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 should arrive to ...

English
Writeacher, I urgently need your help to check a few sentences on job. 1)When I go to the supermarket, first I get the trolley and then I go to the meat and fish section and finally to the check-out counter. I usually pay cash but sometimes by/with the credit card/I use the ...

English
I urgently need to check these sentences for the last time. Thank you. 1) The doctor prescribed a nasal spray to be used (is TO USE a mistake??) three times a day. Incorrect: The doctor prescribed me OR to me a nasal spray ... 2) Why don't you take SOME bicarb (or ...

English
I still have a few doubts. Can you please tell me if the sentences are all possible? Thank you 1) He cut his finger when he was slicing some bread. The surgeon gave him five stiches. The surgeon put five stiches in his finger. 2) The doctor put a cast on my ankle. The doctor ...

English
Thank you very much, Writeacher. Here are some more things I wanted to include. 1) Can you help me organize the introduction to the project? I will also include a group photo of the participating students as well as photos of our school. 2) Once the students know about our ...

English
Can you have a look at these sentences, please? 1. I’m emailing you the list of students, who are looking forward to starting the email partnership. As you can see, there are 25 pupils, coming from different classes and age groups. Do you think you can find other 4 pupils...

English
1) How can I shorten the word sixteen-year-old pupils? sixteen-year-olds? I need to include groups of students belonging to different classes. So I would like to identify them according to their age.

English
Could you please check these last two sentences, again? Thank you. 1) On one hand, I think it would be best to organize a student exchange program for next autumn and, on the other hand see the number of students who would be interested in spending an academic year at your ...

English
I left out the following sentences. Please, could you check them too? 1) My backpack is very heavy because inside (in it? are both possible) there are extra clothes, food, water (or food and water) for two days, a map, and a compass. 2) I'll take a big backpack with a tent...

English
Could you please check these sentences, please? Thank you. 1) The thieves stole a lot of things but they didn't damage the house. (turn this sentence into the passive/this is part of a test: A lot of things was/were stolen by the thieves but the house wasn't damaaged. ...

English
I left out these sentences. Thank you. 1) I hope the weather will be nice/good. I hope to have luck with the weather. If there is heavy rain, I'll have to wear walking boots. I also have a wind breaker in my rucksack in case it will rain. 2) All the boys and girls who will...

English
Imagine you are one of the competitors in the Ten Tors Challenge. Describe your clothes and the things you will take with you on the Challenge. (Can we use both the present continous and the future when described the clothes,: I will wear/ I will have to take ...) I gave two ...

English
I urgently need you to check this. Thank you, Writeacher. 1) Sorry for disturbing you again. Our secretary told me she hasn't received your headmaster's email, yet. 2) Can you please send it again to the following email address.....? We'll be organizing a link to ...

English
I still have a few sentences to check. Thank you very much, Writeacher. 1) During my last holiday I went to Switzerland. For my birthday my parents gave me cards for a horse jumping tournment in Zurich and I went to watch it. 2)We went to friends who have a house in Zurich and...

English
I urgently need you to help me check these sentences. Thank you, Writeacher 1) I'm sorry we havent' been in touch with each other for a long time. I've just been on holiday with my family. 2) I visited a medieval village and two islands on the Maggiore Lake. During...

English
Writeacher, can you suggest possible topics for email conversations among teenagers? 1) I will ask my students to introduce themselves, describe their daily routines, their hobbies and interests and the place where they live. They will do that with the help of our arts teacher...

English
I urgently need you to help me find the proper words. Thank you Writeacher 1) Thank you very much for sending me the list of your students. I was thinking of creating a link to our partnership ( I don't know how to express this) on my school webpage. 2) Five of your ...

English
Writeacher, here is my today's post. I varied my name from Henry to Matthew because there are too many Henry on Jiskha!!! In this way I can get to my post more easily. Imagine you have been on holiday with your family. Write an email to a friend telling him/her all your ...

Calculus-derivatives
Verify if these are correct answers. 1. The derivative of f(x)=e^2x -e^-2x is f'(x)=2e^2x - 2e^-2x? 2.A certain radioactive substance is decaying so that at time t, measured in years, the amount of the substance, in grams, given by the function f(x)=3e^-3t. What is the ...

Chemistry
So for #2 it should be 2Pb(NO3)2 → 2PbO2 + 4NO2 + O2 #4, maybe instead of SO3 on the products side, it should be SO4? So, 4NaCl + 2SO2 + 2H2O + O2 → 2Na2SO4 + 4HCl

Chemistry
So, they give me a word equation, where I am suppose to try and create a balanced equation for it. Ammonium phosphate and barium hydroxide react to form ammonium hydroxide and barium phosphate. 2(NH4)3PO4 + 3BaOH2 → 6NH4OH + Ba3(PO4)2 [I was thinking there should be ...

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 molecular weight is 102.2...

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 molecular weight is 102.2...

Calculus
How many tangents does the graph of f(x)=(x-1)^2(x-3)^2 have? I found out the derivative of f(x)=(x-1)^2(x-3)^2 f'(x)=4x^3 - 24x^2 + 44x -24 What do I do next?

algebra
Hi, Lucy, this is Matthew's mom, if you put the three corners together you would get 1/2 a circle or circumference. I hope this helps you.

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?

Calculus
Could someone help me with this question. Determine what limit would be represented by the following graph. imgur dot com/bceWN I am not sure if it has open dot or closed but what would the equation be for open and closed dot?

Calculus
Is this the right explanation for this question 1. Examine the continuity of the function h(x)= -x, if x<0 0, if x=0 x, if x>0 Answer: Since h(x)= -x, if x<0 0, if x=0 x, if x>0 is h=|x|, we can conclude that the function is 1. continuous everywhere 2. ...

Calculus
I don't know what to write for question b and c. 1 a)Determine the values of x for which the function f(x) = 3/(√x^2+3x-4) is continuous. Values of x are -4 and 1. -------------------------------------- b) What does your answer in part a. represent? c) Why is it ...

Math/trig
Log radical b/ a^2 is equivalent to 1) 1/2 log b + 1/2 log a 2) l/2 log b- 2 log a 3) 2 log b - 1/2 log a 4) 1/2logb/2 log a

Calculus
Verify this question 1. Determine lim as x->3 (3x-8)/(4x-12), if it exists. (3(3)-8)/(4(3)-12) =1/0 Therefore it doesn't limit doesn't.

Calculus
Is there suppose to be calculations involved? :|

Calculus
What would be discontinous at x=? explain please

Calculus
Can someone help me with this question. With steps. Examine the continuity of the function h(x)= -x, if x<0 0, if x=0 x, if x>0

Math
Can You please explain the steps

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

Precalculus
I got 4x^3+8x^2+5x+1/(x-3)

Precalculus
I keep getting wrong answer for this question. Write as a single logarithm log(x+1)+2log(2x+1)-log(x-3)

Precalculus
I keep getting wrong answer for this question. Write as a single logarithm log(x+1)+2log(2x+1)-log(x-3)

Precalculus
I keep getting wrong answer, its not the same as the book :3

Precalculus
Write as a single logarithm log(x+1)+2log(2x+1)-log(x-3)

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

Math
THANK YOU I HAVE BEEN ON THIS FOR SO LONG

Precalculus
Evaluate log(base4)8 + log(base4)(1/8 log(base4)=(8x1/8) =1 I got 1 but the back of the book says 0...?

Physics
Your friend's car is parked on a cliff overlooking the ocean on an incline that makes an angle of 16.9° below the horizontal. The brakes fail, and the car rolls from rest down the incline for a distance of 36.3 m to the edge of the cliff, which is 61.1 m above the ...

English
Is Famine considered as Extra curricular activity?

English
I am doing my application form for a university, it asks for my job information Job Title: I work at Mcdonalds part-time and work in the kitchen, what will my job title be? Kitchen staff? :S

Math
Evan is painting a stool that has a cylindrical seat and four rectangular prism legs. The seat has a diameter of 8 inches and a height of 2 inches. Each leg is 2 inches by 2 inches by ten inches. How much area will Evan have to paint? Use three point one four for pi. Show your...

stats
The null hypothesis in this study where μ1 = tv news group, and μ2 = radio news group is

Math
Total number of scores is 45. Alex scored 9. What percent of the total number of points did Alex score?

Calculas
(Inventory Cost) A shopkeeper finds that the cost C of ordering and storing the latest laptop is C = 2 x + (300000 / x), where x is in the interval [1, 300]. The delivery of truck can bring at most 300 units per order. (a) Find the order size that will minimize the cost (b) ...

Caculas
(Airplane & Radar) An airplane is flying (horizontally) at the height of 6 km on a flight path that will take it directly over a radar tracking station (on ground). If the distance D between the plane and the radar is decreasing at a rate of 300 km/hr, find the speed of the ...

Biology
Using RNA a s a template for prot e in synthesis instead of t r ans l a t ing prot e ins directly from the DNA is advantageous for the cell because A) RNA is much more stable than DNA. B) RNA acts as an expendable copy of the genetic material, allowing the DNA to serve as a ...

Calculus
Find the area of the region bounded by y=x^4/3-4 , the x-axis,x=-1 , and x=1 .. Search tips:

MATH
can you help me with the table and graph for a direct and indirect equations? Y=x Y=x+5

science
like what?

science
are there any current or new treatments available for epilepsy?

science
What is epilepsey?

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 turned during the ...

Chemistry
Calculate the heat (in kJ) required to transform 58.60 g of dinitrogen tetraoxide from a solid at a temperature of -9.3 °C to a gas at 47 °C. Report your answer to one decimal place. Data: Molar mass of dinitrogen tetraoxide, N2O4 = 92.011 g/mol Melting point = -9.3 &...

Chemistry
(a) Which of the ions K+ , Na+ , Be2+ will have the largest heat of hydration? Which the smallest? (b) Of the two compounds KNO3 and NaNO3 , which has the stronger intermolecular forces? (c) Of the two compounds PCl3 and Xe, which has the stronger intermolecular forces?

Statistics
its a worksheet where i have to do the hypothesis tests though.

Statistics
Hi. I need to complete hypothesis tests and i am unsure if i used the correct tests for each of the following: 1. Do people actually prefer Pepsi or Coke in a taste test? 2. Can people correctly identify Pepsi versus Coke? 3. Are people consistent with their prior preference? ...

trig
for what values of theta between 0 and 2 pi is the function of theta equal sine theta positive?

Superglue fuming--fingerprints
What is an amino acid? Why do they cause superglue to stick to my fingerprints on a cd when I place the cd in a plastic box covered with plastic wrap? I'm 9, so I really need just a simple answer. Thanks.

Chemistry
How many molecules (not moles) of NH3 are produced from 8.92×10−4 g of H2?

math
out of 150 students, 20% of them earned straight A's. how many students earned straight A's?

math
determine the value of N: N/20 * 100%=60%

Math
There are 80 students 35 of them are boys about what percent are boys

Math
Thanks

Math
Which of the following is NOT proportional? A)4/10 = 6/15 B) 2/1 = 30/15 C) 5/25 = 4/24 D) 63/90= 70/100

jlc
Three is the first number of pair and 8 is second if 50 is first number what is second number?

4th grade math
you simply have to write it out. So first one the expression would be 1285-622 because have to find the difference between the two numbers.

geometry
The way to work out this problem is that you do the lXhXw so width times the height times the length so 6 times 6 times 6= 216. 5th grader by the way.

7th grade subject
you simply must chose whether which one makes sense so I would go with5-3=2

Proof read please
You should divide the paragraphs so it will look a whole lot neater. Rather than that I think it's good.

English
take out ( ).

physics
suppose an experimental arrangement like the one in part 2 has mass m1= 0.200kg at the 0.100m mark and a mass m2=0.100 kg at 0.750m mark. Can the system be put in equilibrium by a 0.050kg mass? if it can not be done state where it would be placed. If it cannot be done, state ...

Chemistry
Thank you so much for the help on my other question!!! An alloy (solution of metals) is 80% by volume iron. The rest is aluminum. Aluminum has a density of 2.70 g/cm³, and iron's is 7.87 g/cm³. A block of alloy measures 2.0 ft. wide and 3.0 ft. long. If the block...

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?

College Math
I am really struggling with this Fibonacci number problem. If the greates common factor of "m" and "n" is "r", then the greatest common factor of Fm and Fn is Fr. Show that this is true for m=6 and n=9. I am so confused

math
there are two planes. they both leave the airport at 1pm. one plane travels north at 150mph and the other plane travels west at 200mph. how many miles will they be apart at 3pm?

Algebra
19[7+w+(-2)]

Algebra
How far in miles is a line of 1,000,000 pennies. Please show chart with 5 instances. Define a variable and write an algebraic expression.

calculus
Find the derivative of the function. 1. 2x+5/3x-2 2. (1-x)(1+x^2)^-1 Please show work. TYVM. :)

physics
A plane flying horizontally at 50 m/s is 2000m from its target. a)At what height must a projectile be released in order to strike the ground target. (neglect air resistance) b)At what velocity will the projectile strike the target? c)What is the angle of impact with respect to...

physics
A rocket is fired at 1500 m/s at an angle of 50 degrees with respect to the ground. a)What are the horizontal and vertical velocities at 10 seconds. b)What is the actual velocity at 10 seconds.

Math
rays pq and qr are perpendicular. point s lies in the interior of <pqr. if m<pqs = 4x + 7 and m<sqr = 9 + 4a, find m<pqs and m<sqr

economics
Assume that it takes four hours of labor time to paint a room and three hours to sand a floor. If all 24 hours were spent painting, how many rooms could be painted by one person? If a decision were made to sand two floors, how many painted rooms would have to be given up? ...

science
how can pollution start in the Blue Ridge region affect the habitat of a tadpole living in the Piedmont region (think about the watershed)

Algebra
Can i get some help simplifying this fraction? ((x+5)/(x)) / ((x+5)/(2x))

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! :)

physical science
list two safety procedures to create a supersaturated solution

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

Calculus I
Using Newton's Method, determine the first approximation to the solution of: e^(4x)= 10-2x starting with x=0 what is x1= ??? P.S. ( the 1 is a subscript )

language arts
from the following words I got to separate them into 3 groups: omitted syllable, omitted letter, and added syllable. drowned, restaurant, ivory, chocolate, desperate, lightning, adjective, penetrate, aspirin, athletes, identity , sisastrous, ecstatic, platinum, incidentally ...

Physics 203 ( College)
Tangential acceleration is the instantaneous linear acceleration associated with the particle at distance (r) from the center of rotation. thus Centripetal Accel= (angular accel)(r)

Physics
When friction is used to counteract centrifugal force, the side friction factor, f, between the tires and roadway is incorporated into the calculation for the superelevation angle. (the angle of road banking where friction is not needed) tan@=[(Vt)^2-(f)(r)g]/[(r)g+f(Vt)^2] (...

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