# Posts by john

Total # Posts: 8,589

Statistics
Suppose a multiple-choice test has 10 questions each with 5 choices. If a student guesses randomly. What is the probability that they get an B or better. ( they get at least a 80% on the exam) make sure to declare a binomial random variable and show all work

life science
Investigation to determine whether expired air contains carbon dioxide how should state the method,step by step for the experiment

informatic
Flow chart

Chem
At 1 atm, how much energy is required to heat 37.0g of H2O at -24.0 C to H2O at 155.0 C?

History
27

History
How many amendments were originally proposed and submitted to Congress as the initial draft of the Bill of Rights? • A. 12 B. 8 C. 15 D. 10 what will be the answer

History
Under most domestic search warrants what legal standard must be established before a warrant will be issued? A. Reasonable suspicion B. Reasonable cause C. Certiorari D. Probable cause any one sure of the answer

Calculus
Can someone explain how cos(X)/ square root (sin (X)) is 2 square root sin(x) +c Thanks!

Geometry
Determine whether a tangent line is shown in the diagram, for AB = 7, OB = 3.75, and AO = 8. Explain your reasoning. (The figure is not drawn to scale.)

math
10 23/99 I do this by taking the 23/100 and subtracting 1 from the denominator to get 23/99. If you had 10.33333 I would put 3/10 minus 1 from denominator to get 3/9 or 1/3.

physics
A student is thrown in a lake by his teacher, the student has a mass of 70 kg and a volume of 80,000 cm^3. Would the student sink or float? What is the net force on the student? What is the density of an object that has a mass of 2000 kg and a volume of 1.5 m^3? Would it sink ...

physics
A picture hangs on the wall suspended by two strings, as shown in the figure, with θ = 65°. The tension in string 1 is 1.3 N. (a)Is the tension in string 2 greater than, less than, or equal to the tension in string 1? Explain. (b) Verify your answer to part (a) by ...

physics
A baseball player slides into third base with an initial speed of 7.75 m/s. If the coefficient of kinetic friction between the player and the ground is 0.45, how far does the player slide before coming to rest?

physics
A 320 N bench is 2.40m long. The legs are .30m from each end and weigh 15.0 N each. If 3 persons weighing in order ,500 N, 750N, and 1000N sit .40m, 1.20m, and 2m respectively from one end of the bench, what downward force must each set of legs exert on the floor?

math
distance = rate x time + rate x time 22 = 30(x) + 18 (1-x) 22 = 30x + 18 -18x x = time of car Find and multiply it by 30 to find distance traveled in the car.

vocabulary
The couple ordered four hors d'oeuvres at the wedding. Did you just want errors corrected? just caps and spelling?

math
You want to take your 3 equations in 3 variables to 2 equations with the same 2 variables. Since the first equation has x and z, lets see if we can eliminate the y by combining the 2nd and 3rd equations. To eliminate y you need the coefficients to be equal and opposite. So you...

prob & stat
3, 14 6, 10 or 6, 14 7, 10 or 7, 14 10, 14 It looks like there are 6 possibilities that meet this criteria because they all add up to at least 14 which means 14 or more years If we choose two out of 5 Use a combination of 2 chosen from 5 which is 5!/(3! 2!) = 10 choices ! ...

Probabilities
What you did seems correct to me.

math
to simplify .08c = .12d multiply both sides by 100 to get 8c = 12d Now divide both sides by 4 to get 2c = 3d c = 3/2 d c + d 3/2 d + 2/2 d = 5/2 d

english
United Nations, 310, 314, 362 charter of, 311   Declaration of, 309  United States, 225, 238, 275, 289   in Big Four, 322, 325-7   in League of Nations, 299   Lend-Lease policy of, 307   Neutrality of, 305...

math
no it will be C

vocab
1. can be neither seen nor touched 2. has a receiver named 3. has no receiver named 4. expresses highest or lowest degree of comparison 5. add sign of possession to last name 6. indicates time 7. -ly 8. modifies a noun adjective transitive verb abstract noun superlative degree...

Math 157
C=1.75+5p

Calculus
Determine over what interval(s) is the function y=4x-6arctan(x) is concave up/concave down I took the second derivative and ended up with x=0. I do not believe I did this right. IF I happen to be right, wouldn't our answer just be undefined, rather than having intervals ...

Calculus
do you mean the other way around, when 0<y<2 it is upward, and downward at y>2 When I graph it on a number line (how I was taught) that's what I got, but of course I could be wrong.

Calculus
A particle moves on a vertical line so that its coordinate at time t is 3 y = t − 12t+ 3, t≥ 0 . When is the particle moving upward and when is it moving downward? Find the distance that the particle travels in the first 3 seconds. I got that t=2 and t=-2 and its ...

Statistics
8.15

PHYSICS
'show that a 2.5m length of wire with cross section area 0f 1.0mm and resistance of 0.75ohms has a resistivity o f 3.0 ×10-7'

Chemistry
If 100.0 mL of 0.150 M sodium nitrate is added to 50.0 mL of 0.150 M sodium carbonate, what is the resulting molar concentration of the sodium ion?

Math
My hundreds digit means nothing. Six more than my hundreds digit is my thousand’s and ones less than my thousands’ is my ten thousands. My tens digit is four more than my hundreds and my ones digit is five more than my tens digit. Question: What number am I?

(40*21) + (5*31.50)= 840+157.50=997.50

7850.01

Math
How do you solve the equation for finding the principal when the interest, rate, and time are given? I know the formula P=Interest over rate x time. how do you find the solution or amswer?

algebra
Since you cannot divide 4x^2 into 2x+1, the quotient would be zero with a remainder of 2x+1. Which can also be written as 0 (2x+1)/(4X^2 +8X+5)

university
A uniform electric field of magnitude 260 V/m is directed in the positive x direction. A +14.0 µC charge moves from the origin to the point (x, y) = (20.0 cm, 50.0 cm). (a) What is the change in the potential energy of the charge field system?

physic
if you have a intial object going 1m/s to the right then after 1.2seconds its going 0.5m/s to the left. whats is the constant acceleration?

Science living environment Regents
When you change the dna code to mRNA, will A become U or T?

Alg 2 HELP!
x = -b/2a which gives you a turning point which will help you come up with the max or the min. Once you fine x, then you can find y by substituting back into the original equation. Range can also be found by using this turning point.

Statistics
The total area under the control distribution curve is equal to a probability of what?

Statictics
1.8

Math/Physics
No way to solve?

Math/Physics
Given the following vectors, where Vector A is 6.3 meters and Vector B is 3.5 meters, determine the magnitude of the following vector sums: A+B, A-B, B-A I tried to do magnitude such as A+B = square root (6.3)^2+(3.5)^2 = 7.2 then A-B = square root (6.3)^2-(3.5)^2 = 5.2 then ...

Chem.
Thanks

Chem.
A gas bottle contains 0.250 mol of gas at 0.973 bar pressure. If the final pressure is 1.165 bar, how many moles of gas were added to the bottle?

paramedic science
The male person on-scene is complaining of abdominal pain but refuses any treatment or transport going against your advice. He has obvious bruising to his abdomen consistent with a seatbelt injury. Using Queensland Ambulance Service protocols as a guide - discuss what steps ...

physics
A person opens a door by applying a 11-N force perpendicular to it at a distance 0.90m from the hinges. The door is pushed wide open (to 120 ∘ ) in 2.2s How much work was done? What was the average power delivered?

physics
What is the acceleration (in m/s^2) of a vehicle that changes its velocity from 85 km/h to a dead stop in 13 s?

physics
A person opens a door by applying a 11-N force perpendicular to it at a distance 0.90m from the hinges. The door is pushed wide open (to 120 ∘ ) in 2.2s How much work was done? What was the average power delivered?

statisic
I will get you started. You want see if .85 is different from .70 The numerator of your fraction will be: .85 - .70 Always subtract the population proportion from the sample proportion. The .15 has to be divided by the standard deviation. Do you have that formula? The value ...

Math
Christine's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs Christine \$5.85 per pound, and type B coffee costs \$4.40 per pound. This month, Christine made 174 pounds of the blend, for a total cost of \$906.25. How many pounds of type ...

Oh ok is it A then?

Wouldn't it be the opinion of what you would think a wise person would do?

Every profession or field invents its own specialized words, in order to express complicated ideas without excessive wordiness.   Business-speak contains some useful phrases, but also suffers from three major problems: unnecessary words, euphemistic words, and ...

For example, "vis-a-vis" is often used instead of the simpler "in relation to" or "compared to." In this case, the business-speak phrase isn't much shorter than existing phrases, but it is definitely more obscure. This is a step in the wrong ...

Business-Speak In recent years the business world has coined its own unique, jargon-filled sub- language. This sub-language is often called "business-speak" (or "manager-speak," since some of its most enthusiastic users are managers and executives).

English
United Nations, 310, 314, 362 charter of, 311   Declaration of, 309  United States, 225, 238, 275, 289   in Big Four, 322, 325-7   in League of Nations, 299   Lend-Lease policy of, 307   Neutrality of, 305...

English
Pandas  Eating Habits......................................... 1-15  Reproduction......................................... 16-20  Geographic Areas ................................. 21-22  Endangered Species...

English
Thank you!

English
Count' -verb 1. to list numbers sequentially 2. to add up; enumerate 3. to include in a reckoning 4. to deserve consideration, to have merit -noun 5. the act of counting, a calculation 6. the total number resulting from a count 7. Baseball, the number of balls and strikes ...

Language Arts
I think number one is After you sign the agreement, it is too late, of course, to change your mind.

Language Arts
I think number two is Importantly, some of the best-preserved early human remains have been discovered in peat bogs.

Language Arts
1)The sentence says: After you sign the agreement, it is too late, of course, to change your mind. After you sign the agreement it is too late of course, to change your mind. After you sign the agreement, it is too late of course to change your mind. After you sign the ...

English
That is how I see it. Except for where it says counters, it should say counts.

English
Count' -verb 1. to list numbers sequentially 2. to add up; enumerate 3. to include in a reckoning 4. to deserve consideration, to have merit -noun 5. the act of counting, a calculation 6. the total number resulting from a count 7. Baseball, the number of balls and strikes ...

English
While dragonflies have several traits that inspire wonder, many people believe these flying insects are pests. Dragonflies spend much of their lives around water. They not only lay their eggs in or near the water, but their ??? young also develop in the water. In fact, ...

English
Thank you!

English
Which of the following sentence from the passage contain an opinion A) Snow blowers (also called snow throwers) can make the sometimes-difficult often unpleasant task of clearing snow from sidewalks and driveways much easier. B) Most snow blowers are gasoline-powered, though C...

English
Which of the following would be considered primary sources for this passage? manufacturer product manuals product reviews on the internet manufacturer warranty statements critical reviews in a trade journal Based on the passage, which of the following purchases makes the most ...

English
Snow blowers (also called snow throwers) can make the sometimes difficult, often-unpleasant task of clearing snow from sidewalks and driveways much easier. Before making a purchase, however, it’s best to learn a few snow blower basics. Most snow blowers are gasoline ...

But I think it could also be persuasive.

Which of the following writing styles best describes this passage? Descriptive Creative Technical Persuasive is it descriptive

News reporting Time magazine made waves in 2006 when, instead of selecting a politician, entertainer, or activist as its Person of the Year, it selected "you." The magazine's intention was to illustrate how millions of user-post blogs, videos, pictures, and other...

English
Extending her arms over the left-field wall,the baseball plummeted toward the fan,and she caught it cleanly on the fly before displaying the home run ball for all to see. a. Extending her arms over the left-field wall b Toward the fan c On the fly d Before displaying the home ...

English
Then perhaps D. It seems to be the only one left that could start off the paragraph.

English
I meant to say A, is that the one you disagree with?

English
i meant A

English
Which of the following sentence orders best forms an organized, logical paragraph? 1. Planning for a test involves determining the time needed for studying, reviewing notes and previous assignments, and prioritizing the content matter to be studied. 2. Students should ...

english
yes. Thank you

english
In a days work,the employees met their goals for the week. a days" b employees' c day's d employee's i think it is C

English
I did, thank you.

English
nothing else seems to make sense

English
it should still be C right

English
That's how it is

English
Which of the following sentences is punctuated correctly? A carpenter must use certain tools, hammers, saws, chisels, to finish a job. A carpenter must use certain tools hammers, saws, chisels -to finish a job. A carpenter must use certain tools – hammers, saws, chisels ...

english
i meant B, sorry

english
there's a period after the first one also

english

english
Which of the following sentences is written correctly? Mother gets a bit of family news, whenever my aunt visits her Mother gets a bit of family news whenever she visits my aunt. Whenever Mother and my aunt visit, she gets a bit of family news. Whenever Mother visits my aunt ...

English
yes, therefore it should be subject-verb agreement. right?

English
I did not see a nonessential clause, so I didn't think it could be A

English
i think D because there's no comma after stating.

English
Their professor, who was known for his imposing demeanor, looked around the classroom before stating. "Each of you students are responsible for arriving to class on time" Which of the following language conventions is violated in the sentence above? a.Punctuation for...

english
Thank you, and yes there's supposed to be a period at the end.

english
Which of the following sentence correctly follows the rules of punctuation and capitalization? There are two main sources of water pollution: Sewers and factories There are two main sources of water pollution: sewers and factories There are two main sources of water pollution...

Chemistry
You are given 75mL of 1mol/L NaOH and 75 mL of 1mol/L HNO3 at atmospheric pressure. After mixing the two compounds, he measured a rise in temperature from 25°C to 32°C. Find the change in energy of the system in kJ/mol. (Known: Density of aqueous solution is 1.00g/mL ...

Biology
How a radioactive element will decay over time?

Chem
I still am lost on how to find OH- Kw being 1 x10^-14 could leave any possibility for H

Chem
Mostly the H+ is what is confusing me

Chem
Compute values for [H] [OH] and pH of the following aqueous solutions. Tabulate the answers for comparison. Spell out the reasoning in each calculation a) 0.010M HCL b)0.0010M NaOH c) 0.010 N Ba(OH)2 (strong electrolytes assumed to be 100% dissociated.