# Posts by Mark

Total # Posts: 1,718

Physics
A mortar shell is launched with a velocity of 100m/s at an angle of 30 degree above the horizontal from a point on a cliff 50m above a level plain below. How far from the base of the cliff does the mortar shell strike the ground?

statistic
A survey was made of 100 customers in a department store. 70 of the customers indicated they visited the store because of a newspaper advertisement. The remainder had not seen the ad. A total of 40 customers made purchases; of these customers, 30 had seen the ad. What is the ...

statistic
Wendy is a randomly chosen member of a large female population, in which 13% are pregnant. Wendy tests positive in a pregnancy test. Pregnancy test correctly identifies pregnancy 91% of the time and correctly identifies non pregnancy 95% of the time. What is the probability ...

physics
pt A: Fp - Ff. in this case, you would do 30.51 - 17.13 = 13.38

Chemistry
What are the concentrations of OH– and H in a 0.00070 M solution of Ba(OH)2 at 25 °C? Assume complete dissociation.

calculus
f(x)= e^-3x g(x)=x+x^2 calculate the following derivative (d/dx)f(g(x))=?

calculus
let y=(x+sin(x))^2 f(x)=? g(x)=? (f o g)'=? compute the derivative using the chain rule

Calculus
Given the following functions: F(u)= u^(5/2) and g(x)= x^6+1, find-f(g(x))=?, f'(u)=?, f'(g(x))=?, g'(x)=?,(f o g)'(x)=?

College Algebra
8,9), x + 2y = 7 please solve this for me

english
Okay so there is a non profit organization called Heifer. This group sends animals to 3rd world countries. It teaches people to raise animals on their own for food. One stipulation to receiving the animal is you have to give two of it's offspring to another family so they ...

Science
They would form a birdhouse

Science
They would take the shape of a birdhouse

math
simplify the following by adding like terms -4-6m+10n-56-n+9m

Math
Can someone please help me figure out the mean, standard deviation, raw score, and z-score of 27,3,4,16,0.. Any help is super appriciated.. thanks sooo much.

physics
a 2.00 m tall basketball player is standing on the floor 10 m from the basket. if she shoots the ball at a 40 degree angle with the horizontal at what initial speed mjust he throw the basketball so that it goes through the hoop without striking the backboard? the height of ...

Pyschology
When a result is significant, explain why it is wrong to say the result “proves” the research hypothesis. PLEASE HELP

Statistics
Please help me. I am working a paper that needs a verbal statment and a numerical statement. My hypthoesis is The use of social media Facebook is associated with an increase among couples.. if anyone can help that would be great. Thanks so much.

Science NEED HELP NOW
Hate the metric system

physics
sarah ride her bike at an average spped of 6m/s. how long does it take her to ride 6km (6,000 m)?

Chemistry
What is the empirical formula of a hydrocarbon that contains 89.94% C by mass?

Chemistry
What is the empirical formula of a hydrocarbon that contains 89.94% C by mass?

physics
Bob has a helicopter and from the launch pad he flies the following path. First he travels from the launch pad a distance of 33 kilometers at heading 10 degrees West of North. Then he flies 18 kilometers heading 45 degrees East of South. After this he flies 14 kilometers ...

math
140

science
what is the dependent and independant variable, force or pressure?

Math
a bag contains 3 red marbles, 5 blue marbles, 2 yellow marbles, and 2 lavender marbles. How many sets of 4 marbles includes at most one of the yellow marbles?

Physics
F*** you! That wasn't the right answer!

Math
Thank you Ms. Sue

Math
Jane has only \$1 and \$5 in her wallet, and they total \$79.00. If she has a total of 23 bills, how many of each bill does she have?

math
How many sheets of plywood would it take to sheath a roof that covered a building 74' wide,248' long and has a roof pitch of 4" in 12"?

construction
How many square yards would it take to cover a ball that had a radius of 3'?

construction
A swimming pool is 120' long,45' wide and 10' deep.How long would it take to fill with water if your maximum fill rate was 15 gallons per minute?

health
need help in orthopedic physician assistant exam

science
in which of the following materials is the velocity of light greatest

solid mensuration
45.19cm

Easy Pre-calculus Questions?
8.48 feet

English-Native speakers
This is a sentence in active and I have to write it in passive. My solution is: He was expected to bring the drinks or the drinks were expected to be brought which one is correct?

English-Native speakers
What is the passive of the following sentence? We expected him to bring the drinks

English - Native speakers
so the sentence he hoped they would all get what they wanted is not correct? There is no back shift of tenses?

English - Native speakers
oh no :) I thought how do we write it in reported speech?

English - Native speakers
"I hope you'll all get what you want" How does it sound in reported speech?

English - Native speakers
Is it better to use a little or little in the following example? If you have__________ time could you come and help me do my homework

English - Native speakers
can we use here a lot of hope?

English - Native speakers
Can we say : Scientist have a little hope of finding a cure for cancer or little hope.Can we say both? A little means positive and little negative

English-Native speakers
Is a producer synonym for a director?

English vocabulary
Is the synonym for: to have a leading role=to star

English Passive
Can you put this sentence in passive Her mother is teaching her French

English Passive
Can we say in passive: The bad news were or was given? The same with cast has been chosen or have been chosen?

English question tags
Why is the following sentence correct: Nobody is indispensable, is he? Why he? Which question tag can we use here?

English-Native speakers
Why do we use definite article in the sentence: I went to the airport at 8 o'clock. when this airport is mentioned for the first time?

English third conditional
Hello! For example we have a sentence If you________ (not/be) late, we____________(not/miss) the bus. Is it correct to say If you hadn't been late, we wouldn't have missed the bus? Can we write would have not missed? This is wrong right?

General Chem
What do you call a solution that is maid by mixing solid Na2S2O3 5H20 with NaOH? Also, what is the complete balanced equation for mixing the above solution with an aqueous solution of NaClO? Thanks anyone!

math
my tens digit is 5 more than my ones digit and 2 less than my hundreds digit.if the sum of my digit is 18.what number am i?

English - Native speakers
One question: The rule says the we use the definite article with ordinal numbers.I have just seen the example saying "a second letter". Is there some rule when to use it and when not to?

English - Native speakers
Hello! I know articles are really complicated in English language but what is the easiest way to explain the usage of definite, indefinite and zero article?

English - tenses
Thank you both :)

English - tenses
About that May-I agree with both of you. But this sentence about the manager is supposed to be filled with either will arrive soon or is arriving soon (I would fill it in with will arrive but the correct answer is is arriving soon (I accidentally involved going to future in ...

English - tenses
Ok to conclude: Is when in the first sentence synonym for after? If it is then I am clear about the past perfect How would you as a native speaker (I guess :)) explain to me when to use Simple Future and when Going to future?

English - tenses
Yes, I would also use past continuous. One more question. Is it correct that we use Going to Future when we are more sure that something is going to happen and Simple Future when something is not so sure and things can change? If this is correct why is this sentence correct: ...

English - tenses
Why is this sentence correct - concerning tenses I did my homework when I had watched TV. Does this mean that person did her/his homework after watching the Tv?

bio
Explain how genetic diversity in plants and animals supports long-term viability.

English - Native speakers
Hello! What is the difference between switch off the TV and turn off the TV?

math
automoniles arrive at the drive-through windom at a post office at the rate of 4 every 10 minutes. the average service time is 2 minutes. the poisson distributimes are exponentially distributed. (A) what is the average time a car is in the system? (b) what is the average ...

law
In the video game Corporate Cowboy, your task is to investigate complaints of wrongdoing on the part of corporate directors and officers, decide whether there is a violation of the law, and deal with the wrongdoers accordingly. Jane, a shareholder of Goodly Corporation, ...

English - Native speakers
Hello! Can you improve this sentence please "She didn't ask her supervisor days-off."

Chemistry
When 0.5963g of a sample containing NaNO2 and some inert material is allowed to react with excess HSO3NH2, the volume of N2 gas produced is measured. The volume of N2 gas corrected to 298.15K and 100kPa is calculated to be 0.146L. Find the mass percent of NaNO2 in the sample ...

msth
you are planning for your kids future education. he is 8 years old now and will start in ten years. How much will you have to set aside each year in order to have 65,000.00 if the interest rate is 7%.

math
what will a deposit of 4500 be worth if left in the bank for 5 years at 8% compounded quarterly?

Chemistry
A glass of ice water was made by adding six 25 g ice cubes to one liter of water. If the water was initially 25C and the ice cubes were initially at -15C, what is the final temperature of the ice water?

English - Native speakers
Hello! Can we say the following "The three of them are the best of friends" the best of friends?

physics
juana slides a crate along the floor of the moving van the coefficient of kinetic friction between the crate and van floor is 0.120 the crate has a mass of 56.8 kg and juana pushes with horizontal force of 124 N. if 74.4 J of work are done on crate and the delta x is 1.3m. ...

Physics
juana slides a crate along the floor of the moving van the coefficient of kinetic friction between the crate and van floor is 0.120 the crate has a mass of 56.8 kg and juana pushes with horizontal force of 124 N. if 74.4 J of work are done on crate and the delta x is 1.3m. ...

physics
When combined together, what is the weight (NOT MASS) of the moving pucks?

English-Native speakers
Ok one maybe weird question. If Susie is married to Bruce now and they have a son whose name is Edward, what is Edward to Susie's ex-husband Robert(with whom she has 2 children)? Robert is Edward's what?

English-Native speakers
Is glasses only a plural noun? We can't say a glasses right? What about a matches and a tissues?

Math
How do you put 7x= 3y-12 in y=mx+b form?

English - Native speakers
Is it correct to say Is he at work now or Is he now at work?

English - Native speakers
Thank you :) Don't we use hate only with ing? I hate to eat is also correct?

English - Native speakers
Can you please correct these sentences(concerning grammar) We should reduce a politician salary. I hate to eat sweets because it is not good for my teeth. I am going to ban her computer games. I work only a few hours for a month. My salary is going to reduce. He was a judge in...

physics
A .095kg aluminum sphere is dropped rom the roof of a 45m building.If 65% of the thermal energy produced when the sphere hits the ground is absorbed by the sphere, what is its temperature change?

physics
A cube of ice is take from the freezer at -8.5C and placed in a 95g calorimeter aluminum cup containing 310g of water at 20degC. The final situation is observed to be all water at 17degC. What was the mass of the ice cube?

physics
What will be the equilibrium temperature when a 245g block of copper at 285 degrees C is placed in a 145g calorimeter aluminum cup containing 825g of water at 12 C ?

plz help
10

plz help
Southern latitude range of Brazil, south America

Science/ geography?
I don't get the south latitude

Science/ geography?
60 N, 60 S?

Science/ geography?
Is that all Brazil?

Science/ geography?
What is the latitude range for Brazil, South America?

statistics
What is the third quartile, Q3, of the following distribution? 27, 18, 20, 21, 29, 33, 12, 14, 34, 10, 16, 21, 22, 24, 26 A. 24 B. 18 C. 27 D. 4 E. 31

Math
Oh sorry 246 marables

Math
Liz, jas and Sam each have a collection of marbles. The three of them pool their marbles to make a larger collection. They weigh the marbles on a postal scale. Together they have 2\$6 marbles which.weigh 183 ounces. What is the average weight(unit rate) of each marble?

physics
Thanks

physics
A storage tank at stp contains 18.5kg of nitrogen. What is the volume of the tank and what would the pressure be if you added another 15kg of nitrogen at the same temperature?

physic
c) Given these views of Darwin, we can derive an expectation of the ratio of transitional to non-transitional fossils found. I include in the following only those factors which yield a differential expectation of discovery of transitional fossils displaying the action of ...

physic
Given these views of Darwin, we can derive an expectation of the ratio of transitional to non-transitional fossils found. I include in the following only those factors which yield a differential expectation of discovery of transitional fossils displaying the action of natural ...

English - Native speakers
Ok and the last one. Is there a singular form of sheets? Do we say change your sheets? (sheets on the bed, not a sheet of paper)

English - Native speakers
Can we then say He may have come yesterday or just He might have come yesterday? Can we use may in the past tense or not?

English - Native speakers
Ok thank you both :) One more question. Is might the past form of may?

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