# alison

Most popular questions and responses by alison-
## probability

Consider an image, in which every pixel takes a value of 1, with probability q, and a value 0, with probability 1−q, where q is the realized value of a random variable Q which is distributed uniformly over the interval [0,1]. The realized value q is the

*asked on November 16, 2018* -
## CHEMISTRY!!!=0

Determine pH of each solution: b) 0.20 M CH3NH3I I did.... CH3NH3^+ +H2O -> CH3NH2 + H3O^+ 0.20 ---------------0--------------0 0.20-x--------------x------------x so i got... ? =x^2/0.20-x i looked up in the back of the book and found the Kb of CH3NH2 to

*asked on March 1, 2012* -
## Chemistry

An 8.00 mass % aqueous solution of ammonia has a density of 0.9651g/ml. Calculate the molality, molarity, and mole fraction of NH3. This question seems simple but I cannot seem to remember how to do this. Help please?

*asked on December 14, 2011* -
## Chemistry!!!

Consider a solution that is 0.022 M in Fe2+ and 0.014 M in Mg+2. A). If potassium carbonate is used to selectively precipitate one of the cations while leaving the other on solution, which cation will precipitate first? What minimum concentration of K2CO3

*asked on March 21, 2012* -
## CHEMISTRY!!!!!!! HELP PLEASE:)

How many kilograms of chlorine are in 24 kg of each of the following chlorofuorocarbons (CFCs)? 1) CF2CL2 express answer using two sig figs how would i solve for this problem??? thanks!

*asked on September 7, 2011* -
## Trigonometry

Prove identity. Sec(pi-x)=-sec x

*asked on October 23, 2011* -
## probability

Marie distributes toys for toddlers. She makes visits to households and gives away one toy only on visits for which the door is answered and a toddler is in residence. On any visit, the probability of the door being answered is 3/4, and the probability

*asked on November 24, 2018* -
## Chem!!!:/

Determine whether of not each compound will be more soluble in acidic soln than in pure water. Explain. A). Hg2Br2 B). Mg(OH)2 C). CaCO3 D). AgI I think acid, neutral,acid,neutral ??? Help please!:) thAnks

*asked on March 19, 2012* -
## Chemistry

The boiling point of another member of this homologous series was found to be 309 K. What is the likely molecular formula for this compound? How many carbon atoms would you expect this new compound to have if its boiling point is between that of a

*asked on March 14, 2011* -
## Science

Write the half reactions and the balanced equation for the galvanic cell Hg(ℓ)| Hg2(+2)(aq)|| MnO(−4)(aq), Mn2 (aq), H(+)(aq)| Pt(s). What is the smallest possible integer coefﬁcient of Mn(2+)(aq) in the combined balanced equation?

*asked on November 15, 2014* -
## ALGEBRA

Part A: Maria rented a coat at $285 for 3 days. If she rents the same coat for 6 days, she has to pay a total rent of $510. Write an equation in the standard form to represent the total rent (y) that Maria has to pay for renting the coat for x days. Part

*asked on October 30, 2015* -
## Kate

Jay, Kay, Ray found themselves far apart for lunch while working in a field. Jay could see Kay, then turned 75 degrees and see Ray. Kay could see Ray, then turn 51 degrees and see Jay. Ray could see jay, then turn 54 degrees and see Kay. Which two were the

*asked on January 27, 2015* -
## CHEMISTRY!!!=0

Determine the pH of each solution: (a) 0.10 M NH4Cl can someone show me how to do this one so i have the idea of how to do the rest. thanks!

*asked on March 1, 2012* -
## trig

suppose theta is in the interval (90,180 degrees) find the sign of csc(-theta) is it positive or negative = positive???

*asked on September 6, 2011* -
## Physics

A car rounds a curve with a radius of 25 m at a speed 30 m/s. What is the centripetal acceleration of the car?

*asked on September 22, 2013* -
## chemistry

combustion analysis of a hydrocarbon produced: 33.01 g CO2 and 13.51 g H2O Calculate the empirical formula of the Hydrocarbon. I got CH5 but that doesn't seem right? how do i do this problem?

*asked on September 11, 2011* -
## physics

A skateboarder travels on a horizontal surface with an initial velocity of 4.4 m/s toward the south and a constant acceleration of 2.0 m/s2 toward the east. Let the x direction be eastward and the y direction be northward, and let the skateboarder be at

*asked on September 29, 2018* -
## math (taylor polynomials)

Find the degree 3 Taylor polynomial T3(x) of the function f(x)=(7x+50)4/3 at a=2 Find the second-degree Taylor polynomial for f(x)=4x2−7x+6 about x=0 thank you! (:

*asked on November 30, 2011* -
## Algebra

john is three times as old as Greg, and Greg is half the age of Bob, Steve is two times the age of John and Bob combined. if Steve's age is 60, how old is Greg's older cousin Jane, who is two years older than Greg?

*asked on April 14, 2016* -
## Math

Write an absolute value equation representing all numbers x whose distance from 0 is 17 units.

*asked on September 15, 2017* -
## chemestry

what is the electron configuration of lithium after making an octet

*asked on September 29, 2014* -
## Physics

two identical brass balls mounted on wooden posts initially have different amounts of charge, one plus 3 uC and the other plus 15 uC. The balls are allowed to touch and then separate again. What is the final charge on each ball?

*asked on October 26, 2013* -
## math

what numbers would you use to estimate the sum of 47 and 21?

*asked on March 29, 2011* -
## Social Studies

What were some reasons for the French and Indian war?

*asked on September 4, 2018* -
## Chemistry

what is the emission spectrum of the sun and what does this spectrum reveal about the types of elements in the sun?

*asked on October 27, 2007* -
## Chemistry

THE RATE LAW FOR THE REACTION 2NO + 02 = 2NO2 IS FIRST ORDER IN OXYGEN AND SECOND ORDER IN NO. PROPOSE A MECHANISM IN WHICH EACH STEP IS BIMOLECULAR. SPECIFY THE SLOW STEP. I HAVE NO IDEA WHAT TI DO. HELP PLEASE? THANKS.

*asked on January 22, 2012* -
## french

What contributions did the french make to america?

*asked on December 12, 2007* -
## chemistry

HF hydrolyzes according to the following equation: HF(aq)+H2O(l) H3O+(aq)+F-(aq) When 0.0300 mol of HF dissolves in 1.0 L of water, the solution quickly ionizes to reach equilibrium. At equilibrium, the remaining [HF]=0.0270 M. a.) How many moles of HF

*asked on May 1, 2016* -
## math

Kalin walks at a steady rate of 3 2/3miles per hour. The beach is 4 1/4 miles from his home. How long will it take Kalin to walk from his home to the beach and back to his home?

*asked on February 6, 2014* -
## Trigonometry

Write as an algebraic expression in u. Tan(cos^-1 u)

*asked on October 29, 2011* -
## chemistry

If 15.0 mL of a 1.5M HCl solution at 22.5 degrees C is mixed with 25.0mL of a 1.5M NaOH solution at 21.5 degrees C that is in a calorimeter, and the final mixed solution temperature ends up at 28.5 degrees C, 1.)what is the balanced equation for this

*asked on April 13, 2014* -
## ChemB

CALCULATE PH OF THE SOLUTION THAT RESULTS FROM EACH SOLUTION A) 150.0mL OF 0.25M HF WITH 225.0 mL OF 0.30M NaF Help please, these buffer questions are confusing.

*asked on March 12, 2012* -
## Further calculus

1) A price p (in dollars) and demand x for a product are related by 2x^2+6xp+50p^2=10600. If the price is increasing at a rate of 4 dollars per month when the price is 30 dollars, find the rate of change of the demand. 2) a) The price (in dollars) p and

*asked on November 2, 2011* -
## probability

Consider a Bernoulli process with parameter p=1/3. Let T1 be the time of the first success and let T1+T2 be the time of the second success. We are told that the results of the two slots that follow the first success are failures, so that XT1+1=XT1+2=0.

*asked on November 26, 2018* -
## ChemB

A forming acid solution has a pH of 3.25. Which of these substances will raise the pH of the solution upon addition? Explain. A) HCl B) NaBr C) NaCHO2 D) KCl

*asked on March 12, 2012* -
## maths pre ap

Krispy Krunch cereal is 49% sugar. about how many ounces of sugar are in a 16 oz box of Krispy Krunch?

*asked on February 9, 2011* -
## chem

An industrial chemist is studying smAll organic compounds for their potential use as an auto antifreeze. When 0.243g of a compound is dissolved in 25.0 ml of water, the freezing point is -0.201 degree celcius. (A) Calculate the molar mass of compound

*asked on December 14, 2011* -
## Algebra

A jet plane traveling at 550 mph overtakes a propeller plane traveling at 150 mph that had a 22-hour head start. How far from the starting point are the planes? The planes are ____ miles from the starting point.

*asked on September 17, 2017* -
## Chemistry

You carefully weigh out 19.00 of powder and add it to 76.95 of solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 88.16 . The relevant equation is CaCO3+2HCl ----> H2O + CO2 + CaCl2

*asked on September 9, 2011* -
## math

you are designing a 1000-cm^3 right circular cylindrical can whose manufacture will take waste into account. There is no waste in cutting the aluminum for the side, but the top and bottom of radius r will be cut from squares that measure 2r units on a

*asked on November 28, 2009* -
## Chemistry

A rxn has delta H ^0 rxn=-112kj and delta S^0 rxn =354 J/K. at what temp is the change in entropy for the rxn equal to the change in entropy for the surroundings?

*asked on April 12, 2012* -
## Physics

Rank the magnitude of the change in momentum of a ball from largest to smallest in the following situations: a) The ball is moving with constant velocity, hits a wall, and stops moving. b) The ball is moving with constant velocity, hits a wall, and bounces

*asked on October 12, 2018* -
## Math

Weatherwise is a magazine published by the American Meteorological Society. One issue gives a rating system used to classify Nor'easter storms that frequently hit New England and can cause much damage near the ocean. A severe storm has an average peak wave

*asked on December 23, 2012* -
## math

question: find the points at which the graph of x^2 -4x + y62 -6y =12 has a vertical or horizontal tangent line. I found the deriviative to be (x-2)/(3-y) Then, the x value for a horizontal would be x=2 and the y value for a vertical would be y=3. But how

*asked on November 1, 2009* -
## CHEM

a 250.0ml buffer solution is 0.250M in ascetic acid and 0.250M in sodium acetate. B). What is pH after addition of 0.0050mol of HCl? C). What is pH after addition of 0.0050mol of NaOH?

*asked on March 28, 2012* -
## physics

After 10.3 s, a jogger’s displacement is 360 m. What is the average velocity in m/s? Answer in units of m/s part 2 What is the average velocity in km/h? Answer in units of km/h

*asked on October 1, 2013* -
## trig

An automobile windshield washer 10inches long rotates an angle of 60degrres. If the rubber part of the blade only covers the last 9inches of the wiped, find the area of the windshield cleaned by the wiper.

*asked on September 17, 2011* -
## trig

find all values of theta in the interval (0,360) that have the given value: sintheta= √2 ______ 2

*asked on September 6, 2011* -
## Maths, Life Science, Geography, Business Studies

What career opportunities are open for me regarding the above subjects?

*asked on February 6, 2015* -
## CHEMISTRY:))))

A rock is 5.0% by mass fayolite(Fe2SiO4), 7.0% by mass forsterite(Mg2SiO4) and the remainder silicon dioxide. What is the mass percent of each element in the rock? I have the answers but i don't know how to solve the problem. How would you in steps solve

*asked on September 1, 2011* -
## Calculating Averages?

A certain element has four isotopes. 5.85% of has a mass of 53.93961 . 91.8% of has a mass of 55.934939 . 2.12% of has a mass of 56.93539 . 0.282% of has a mass of 57.93328 . What is the average atomic mass of element ? Express your answer numerically to

*asked on August 29, 2011* -
## Chemistry

The mass of the earth is known to be about 5.98 X10^24kg assume that it is approx. spherical with an average diameter of 1.276X10^7 METERS. from these data calculate the average density of the earth(g/cm^3) could the earth be made mostly of water

*asked on August 30, 2011* -
## Government

1. The main purpose of a legislature, whether it be the Indiana General Assembly or the US Congress, is to MAKE laws. True False 2. Indiana's two US Senators are Richard Lugar (R) and Dan Coats (R) True False 3. Currently in the US House of

*asked on July 4, 2016* -
## physics

A stone is dropped from the roof of a building; 1.60s after that, a second stone is thrown straight down with an initial speed of 26.0m/s , and the two stones land at the same time. part a. How long did it take the first stone to reach the ground? part

*asked on September 6, 2013* -
## Math (linear approximation)

Find a linear approximation of the function f(x)=(1+x)^(1/4) at a=1, and use it to approximate the numbers (.95)^(1/4) and (1.1)^(1/4). Round your answers to the nearest thousandth Cheers in advance!

*asked on November 29, 2011* -
## CHEM

Compare the value you obtained from average bond energies: (260Kj) to the actual standard enthalpy of formation of gaseous benzene, 82.9 kj. What does the difference between these two values tell you about the stability of benzene?

*asked on November 8, 2011* -
## Algebra

A statue is 8ft. tall. The display case for a model of the statue is 18 inches tall. Which scale allows for the tallest model of the statue that will fit in the display case? A. 1 inch: 2 inches B. 1 inch: 7 inches C. 1 inch: 5 inches D. 1 inch: 10 inches

*asked on October 25, 2007* -
## chemistry

35.6 g of Zn reacts with 87.1 g of Br to produce ZnBr2, the only product, with no reactant left over. How much ZnBr2 could be formed by reacting 156 g of Br? 1. 538 g 2. 45.4 g 3. 382 g 4. 220 g 5. 0.0156 g 6. 0.00262 g

*asked on August 27, 2014* -
## Math

How to solve: There are 40 chickens and cows in the farmyard. There are 100 legs in all. How many are cows and how many are chickens

*asked on September 16, 2010* -
## Math - APPRICIATE ALL HELP!

Suppose that a household's monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, HCF). When graphed, the function gives a line with a slope of 1.75. If the monthly bill fro 24 HCF is

*asked on November 9, 2016* -
## Finance

Brand Advertising is offered a 3/10 net 40 trade discount by its supplier. In the past Brand has been able to ger away with paying for supplies on credit in 60 days. Since it doesn't have money on hand to take advantage of the discount, it tries to

*asked on April 14, 2012* -
## Chemistry

A rock is 5.0% by mass fayolite(Fe2SiO4), 7.0% by mass forsterite(Mg2SiO4) and the remainder silicon dioxide. What is the mass percent of each element in the rock? I have the answers but i don't know how to solve the problem. How would you in steps solve

*asked on August 31, 2011* -
## Physics

A 2000kg car rounds a curve of 65m banked at an angle of 11∘ How much friction force will be required? I know how to find frictional force on a normal flat surface but I don't know how to apply it with a curve. Any help with work would be great!

*asked on September 27, 2013* -
## Statistics

An economist found that a random sample of 42 high school teachers had an average annual salary of $56,490. A previous study showed that the population standard deviation is $4150. Find the 99% confidence interval for µ, the average annual salary of all

*asked on December 17, 2012* -
## trig

How do i solve this equation over the interval [0degrees,360) cot(theta)+2csc(theta)=5

*asked on December 10, 2011* -
## Math

a carpenter divides a board that is 3.5 inches wide into 4 pieces of equal widthby cutting 3 places. if the width of her saw blade is 1/8 inch, what is the finished width of each piece? What percent of the board length is actullay used?

*asked on May 11, 2016* -
## Physics

During a head on car crash, the car is designed to slow down as its front end crumples. If a person can survive an acceleration of -33 m/s how far must the front end crumple if the car was initially traveling at 28 m/s?

*asked on June 17, 2013* -
## TRIG

1) Find an angle that makes the statement true: costheta =sin(3theta+10degrees) 2) Verify this proof: sec(Pie -x)= -secx Can someone show me how to solve for these. Very much appreciated!

*asked on October 23, 2011* -
## Chemistry

Write the formulas of the ions (including charges) present in aqueous solutions of the following: K2CO3 NH4NO3 NA2Cr2O7 Mg(C2H3O2)2 Make sure it is both mass and charge balanced. Here is a listing of many polyatomic ions. This should give you a start. Post

*asked on April 4, 2007* -
## Physics

A swimmer wants to cross a river, from point A to point B, as shown in the figure. The distance d1 (from A to C) is 200 m, the distance d2 (from C to B) is 132 m, and the speed of the current in the river is 1.0 m/s. Suppose that the swimmer's velocity

*asked on February 1, 2014* -
## PHYSICS!!

I've tried this problem again and again using conservation of momentum and energy but I am not having any luck: A ball of mass 0.300kg that is moving with a speed of 8.0m/s collides head-on and elastically with another ball initially at rest. Immediately

*asked on October 11, 2013* -
## math

A model of a boat is 1 3/8 feet long. How long is the model of a ship that is 3 times as long, I'd the models are made to the same scale?

*asked on February 11, 2013* -
## Physiology-help please:(

A child is brought to the speech therapist because she does not pronounce high-pitched sounds (like "s"). Name the sensory organ that is most likely the problem and what area of the organ is being affected? She also experiences extreme dizziness and loss

*asked on July 9, 2012* -
## Chemistry

Write balanced net ionic equAtions. D) zinc chloride and excess ammonia E) cupric phosphate and lots of ammonia A) ammonia and excess zinc sulfate

*asked on April 8, 2012* -
## Chemistry

1.CALCULATE pH of 1.0 L 0.010 M ascetic acid and 0.50 L 0.010 M NaOH. 2. Calculate pH of 1.0 L 0.010 M NaOH and 0.500 L 0.010M HCl Buffer help?

*asked on March 15, 2012* -
## Science n math

What is the molecular geometry n the electron domain for HCN

*asked on February 15, 2012* -
## Math- calculus

Suppose f is a function which satisfies the properties: f(x+y)=f(x)+f(y)+x2y+xy2 for all real numbers x and y, and limx→0f(x)x=1. f′(x) thanks in advance!

*asked on September 28, 2011* -
## trig

find the exact values of the six trig functions of the angle. -750 sin(-750)= cos(-750)= tan(-750)= csc(-750)= sec(-750)= cot(-750)= I've tried this question over and over again and i cannot get it right. i believe -750 is in the fourth quadrant but I'm

*asked on September 6, 2011* -
## Chemistry

Two of the questions my teacher put on the review sheet for our Acid/Base test are 1) what is the characteristic property of a buffer solution? and 2) what does a buffer solution contain? i think a buffer solution contains a weak acid and its conjugate

*asked on May 15, 2010* -
## math

find the value for (m) that makes each number sentence true a. 2/3 x 4/5 x m =1/3 b. 4/5 x 2/3 x m =1/3 c.2/3 x 4/5 = 1/3 / m

*asked on February 6, 2014* -
## Math

A friend claims that the average length of trout caught in this lake is 19 inches. To test this claim we find that a sample of 13 trout has a mean length of 18.1 inches with a sample standard deviation of 3.3 inches. The population standard deviation is

*asked on December 22, 2012* -
## calc

1)Convert 1/20 of a circle to both degrees and radians. All I have is 9/180 is what I come up with. 2) what fraction of a circle does 3pi/4 represent? Is 1/4 correct? 3) a ferries wheel has cars which move at 1.5mph. If the diameter of the wheel is 600 ft,

*asked on April 28, 2012* -
## chem

A student placed 12.0grams of glucose in a flask added enough water to dissolve glucose by swirling then added additional water until the .100 ml mark. A 60.0ml sample of this glucose soon was diluted to 0.500 L. How many grams of glucose are in 100. ml of

*asked on September 19, 2011* -
## Trig

how do i find the exact value of s [pie/2, pie] sin s = radical2/ whole number 2 what is s in radians? how do i figure this out without the use of a calculator. I drew the graph and located it in the second quadrant and i think the triangle is a 45-45-90

*asked on September 15, 2011* -
## trig

find the next two positive and negative angles coterminal with the quadrantal angle. 90 degrees. would the answer be..... would it be 450, 810?????? and -630, -270 ????

*asked on August 29, 2011* -
## Chemistry

I know that the more polar the bond between the H and A (if HA is an acid) is, the stronger the acid will be. what does it mean for a bond to be polar? is a bond more polar if it is more electronegative? how are bonds polar and how are bonds nonpolar? what

*asked on May 16, 2010* -
## Accounting

Rita forms Finch Corporation by transferring land (basis of 125,000; fair market value of 750,000) which is subject to a mortgage of 375,000. Two weeks prior to incorporating Finch, Rita borrows 125,000 for personal purposes and gives the lender a second

*asked on March 4, 2010* -
## math - 6th grade

how do you do front end estimation when the number of digits are different....like 12,249 - 6,875 dgud wat are the poperties of math and what do they all mean????????? i need help in my homework I haven't used the expression "front end" estimation but I

*asked on September 25, 2006* -
## Math

Which is an equation of the line that passed through ( 2,-5 ) and ( 6,3 ). A. Y= 1/2X - 6 B. Y= 1/2X C. Y= 2X + 12 D. Y= 2X - 9

*asked on November 3, 2013* -
## Math

An inner tube for a bicycle has a diameter of 2 inches and measures about 82 inches along its circumference. What formula would you use to determine the numbers of cubic inches of air the inner tube can hold

*asked on February 2, 2012* -
## Math

An inner tube for a bicycle has a diameter of 2 inches and measures about 82 inches along its circumference. What formula would you use to determine the numbers of cubic inches of air the inner tube can hold

*asked on February 2, 2012* -
## Trig

find the exact values of the six trig functions of angle... sin(-315degrees) how do i do this?

*asked on September 1, 2011* -
## Trig

assume A= alpha using complementary rule how do I solve for alpha? cos(2A+40) =sin(3A-60) I don't understand how to start the question. What are the steps in solving for alpha. Do i get cos to equal sin somehow?

*asked on September 1, 2011* -
## ENGLISH

ive done ten sentences, five are verb and five are adjective, please check. 1. Lily bought a pink cat mask for the halloween party. 2. Anna was covering her scar with makeup as she didn't want anyone to make fun of it. 3. Tory dressed up in disguise to

*asked on January 16, 2011* -
## ENGLISH

write 5 sentnces using synomnyns of hide as 5 description and 5 verb. please help, atleast one sentence give to me using one description synonym of hide and one verb synonym of hide all in one sentence.

*asked on January 12, 2011* -
## Chemistry

A solution of acetic acid having a concentration of about 0.2M is to be titrated using 0.200M NaOH. Select an indicator for the titration. what salt will the solution contain at the equivalence point? what is the approximate concentration of this salt at

*asked on May 15, 2010* -
## MS. SUE/english

dear ms. sue what is a propositional phrase

*asked on February 19, 2010* -
## English

I'm fishing for my word that I can use in my essay that would mean free with giving (almost to a fault), where one gives with little regard to where the money goes and what it would be used for.

*asked on January 28, 2010* -
## punnett squares

how would i make a punnet square to find the offspring of parents: SsYy x ssyy I don't understand what i would put for each of the boxes on the outside

*asked on December 20, 2009* -
## calculus

how would i find the deriviative of y= x^ (- square root of 2)

*asked on October 29, 2009*

## Pages

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