# Kathryn

Most popular questions and responses by Kathryn-
## Algebra

the table shows the results of a survey of college students. find the probability that a student's first class of the day is a humanities class, given the student is female. First class of the day for college students male female humanities 70 80 science

*asked on May 19, 2014* -
## Math

Garrett throws a dart at a circular dart board. The dart board has a radius, and the bull's eye in the center of the dart board has a radius of 6 inches. What is the probability that a dart thrown at random within the dartboard will hit the bull's eye?

*asked on May 19, 2014* -
## Algebra 2

A beam rests against a wall, forming a 50 degree with the floor. Use the function y=9 sec 0 to find the length of the beam to the nearest tenth of a foot. choice: 14.0ft, 11.ft7, 5.8ft, 6.9ft

*asked on May 19, 2014* -
## algebra

Which cosine function has maximum of -2, and a period of 2pi/3

*asked on May 19, 2014* -
## Science

Earth's energy sources include both renewable and nonrenewable resources. Name at least three sources of energy that could be used in your house. Then describe the ideal energy source for generating most of your home's electricity, and explain why you

*asked on May 16, 2018* -
## Health

3. No matter if you are underweight, overweight, or an appropriate weight, you still need exercise. TRUE *** FALSE 4. A person who is heavier than the standard for the person's height is OVERWEIGHT *** OBESE HEFTY EXTREMELY OBESE 7. Which of the following

*asked on November 6, 2015* -
## Chemistry

I am beyond desperate. I do not understand how to calculate heat change at all and I have been looking online and reading my book for the last three hours. Below is posted a problem. It would be amazing if someone could work through it and explain each

*asked on April 7, 2009* -
## Chemistry

Which of the following compounds is a strong electrolyte? a. C6H12O6 b. C7H14O5 c. C4H8O2 d. NaC2H3O2 e. All of these --- I think it is D but I'm not sure. Also, how do you know if it is a strong or weak acid?

*asked on April 20, 2011* -
## Physicis

How much energy is needed to heat and melt 3.0 kg of copper initially at 83°C? Be mindful of significant figure rules for both multiplication and addition

*asked on December 10, 2012* -
## Statistics

A) Identify the question, population, and sample. b) Discuss any potential bias or lurking variables that may affect the results.? c) Write about the extent to which we can generalize the findings to all people who use cell phones. Stewart Fist reported

*asked on January 21, 2015* -
## statistics

A) Identify the question, population, and sample. b) Discuss any potential bias or lurking variables that may affect the results.? c) Write about the extent to which we can generalize the findings to all people who use cell phones. Stewart Fist reported

*asked on January 21, 2015* -
## statistics

A) Identify the question, population, and sample. b) Discuss any potential bias or lurking variables that may affect the results.? c) Write about the extent to which we can generalize the findings to all people who use cell phones. Stewart Fist reported

*asked on January 21, 2015* -
## physics

If an object is dropped from a tall building and hits the ground 3.0 s later, how tall is the building?

*asked on November 7, 2012* -
## art

Compare and contrast the use of geometric shapes in Pablo Picasso's "three musicians" and Edward Hopper's "house by the railroad". Thanks!

*asked on March 6, 2017* -
## Trig

Prove cos^2t+4cost+4/cost+2=2sect+1/sect

*asked on March 5, 2012* -
## chemistry

The specific heat of copper metal is 0.385 J/ g- K. How many KJ of heat needed to raise the temperature of 1.1 kg block of copper from 27.5 C to 50 C?

*asked on March 19, 2017* -
## chemistry

a buffer is prepared by combining 10.0g of NaH2PO4 wiht 150mL of 0.20M NaOH and diluting to 2.0L. What is the pH of the buffer, Ka H2PO4-= 6.2x10-8

*asked on October 7, 2009* -
## AP Chem. 3

A 1.80 g sample of a large boimolecule was dissolved in 21.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolecule. For carbon tetrachloride, the boiling point constant is

*asked on January 30, 2012* -
## Physics

If the 50.0 kg boy were in a spacecraft 5R from the center of the earth, what would his weight be? (Use the 50.0 kg boy for significant figures) i got 20N again not sure.. it dosnt tell me if i got them wrong or right online classes are horrible and very

*asked on November 7, 2012* -
## Histories/Social Studies

What was the dividing line between Former Han and the later Han marked by? ((IN ancient China))

*asked on October 27, 2008* -
## chemistry

a scientist wants to make a solution of tribasic sodium phosphate ,Na3PO4, for an experiment. how many grams of Na3PO4 will be needed to produce 750 mL of a solution that has a concentration of Na+ ions of 1.30M

*asked on March 14, 2010* -
## Physics

A 6.00 Kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is 0.360. Determine the kinetic frictional force that acts on the box when the elevator (a) is stationary (b)

*asked on November 7, 2012* -
## physics

If an object is dropped from a tall building and hits the ground 3.0 s. later, what is the magnitude of the object's displacement in 1.0 s.; in 2.0 s.? for 1.0s i got 9.8 for 2.0s i got 20. is this correct?

*asked on November 7, 2012* -
## Biology

Read the statment and then say which answer is right, why its right and why the others are wrong. I think the answer might be D but I don't know how to explain it or if it is even right. A biologist marked a cell which she knew was about to undergo

*asked on December 18, 2007* -
## 5th grade Math

Dr. Gallo's waiting room has a total of 18 magazines, including 3 fashion magazines. There are 5 more cooking magazines than there are decorating magazines. How many decorating magazines are there? You can use cubes to act out the problem.

*asked on December 3, 2013* -
## physics

If an object is dropped from a tall building and hits the ground 3.0 s later, what is the velocity of the object when it hits the ground? (Remember that the velocity is downward) i got -29m/s is this correct?

*asked on November 7, 2012* -
## chemistry

I have two questions that I really don't understand. The first one is: A reaction proceeds with delta H=-10kJ/mol. The energy of activation of the uncatalyzed reaction is 150kJ/mol, whereas it is 100kJ/mol for the uncatalyzed reaction. How many times

*asked on March 5, 2012* -
## Physics

Calculate the total heat content of 10 kg of ice at -23°C. (Hint: absolute zero is -273°C.) Be mindful of significant figure rules for both multiplication and addition.

*asked on December 10, 2012* -
## 5th grade Math

Dr. Gallo's waiting room has a total of 18 magazines, including 3 fashion magazines. There are 5 more cooking magazines than there are decorating magazines. How many decorating magazines are there? You can use cubes to act out the problem.

*asked on December 3, 2013* -
## Statistics

suppose 60 people are asked which method is best to avoid getting the flu. the results are shown in the table below. determine the percentage for each method and complete the table. round to the nearest whole number. Method Frequency % Flu shot 15 washing

*asked on August 19, 2014* -
## Stats

1.Number of people in attendance at a baseball game qualitative/ordinal qualitative/nominal quantitative/discrete quantitative/continuous 2. number of tracks on a CD qualitative/ordinal qualitative/nominal quantitative/discrete quantitative/continuous

*asked on August 11, 2014* -
## Math

Bunches of 6 roses were selling for $8. Anita paid $40 for roses. How many roses did she buy? PLEASE HELP!

*asked on October 1, 2012* -
## Trig

A ship leaves port with a bearing of S 40 W. After traveling 7 miles, the ship turns 90 degrees on a bearing of N 50 W for 11 miles. At that time, what is the bearing of the ship from port?

*asked on March 5, 2012* -
## physics

A backpack full of books weighing 58.0 rests on a table in a physics laboratory classroom. A spring with a force constant of 140 is attached to the backpack and pulled horizontally. If the backpack begins to slide when the spring ( = 140 ) stretches by

*asked on May 19, 2011* -
## Writing--Plz Help!!

I am confused with this question that I have on a homework assignment. When developing a written plan, a technique in which the writer includes every detail as it occurs is called: 1. writing a rough draft 2. outlining 3. brainstorming I am leaning toward

*asked on December 5, 2006* -
## Science

Describe in one paraghraph what embryonic and adult stem cells are and how knowing the difference relates to the artice (the article was on stem cells from human skin; no embryos needed). How do i answer that and what are embryonic cella and adult stem

*asked on February 25, 2008* -
## HELP, PLEASE-Science

Read the statment and then say which answer is right, why its right and why the others are wrong. I think the answer might be D but I don't know how to explain it or if it is even right. A biologist marked a cell which she knew was about to undergo

*asked on December 19, 2007* -
## Math

Last weekend, I went to play in the nearby park. It was real fun! I rode my new bicycle that Mom had gifted me on my birthday. On reaching the park, I saw that there were a total of 8 bicycles and tricycles. If the total number of wheels was 20, how many

*asked on June 24, 2008* -
## Question

What needs to be done to correct this sentence? 1.Just what would you do,Cheryl,if the situation were reversed? a.The sentence is correctly punctuated. b.Remove the comma before Cheryl. c.Remove the comma after Cheryl. d.Replace the comma after Cheryl with

*asked on October 17, 2006* -
## writing

I need help writing a thesis statement for my philosophy paper. The paper is about two philosopher's, Thrasymachus and Socrates. Essentially the paper is about the multiple definitions of justice that Thrasymachus throws out and how Socrates proves them

*asked on March 3, 2012* -
## chemistry

Does Kv2SOv4, Kv2COv3 or KCv2Hv3Ov2 create the greatest increase in pH when mixed with water?

*asked on January 13, 2011* -
## 12th grade

prove that the statement 1/5+1/5^2+1/5^3 +...+1/5^n=1/4(1-1/5^n) is true for all positive integers n, write your proof in the space below

*asked on September 22, 2010* -
## Science (?)

What are all the ways humans use rivers? I am writing a report on the relationship between water and organisms and I am now talking about the ways we humans use river. So far I have as a source of transportation, recreation (for boating, fishing, and

*asked on November 30, 2008* -
## Prob and Stats

If X is a random variable with distribution X~N(350,110) find (a)P(X

*asked on October 4, 2011* -
## physics

A car goes around a curve on a road that is banked at an angle of 30.5 . Even though the road is slick, the car will stay on the road without any friction between its tires and the road when its speed is 19.0 . What is the radius of the curve?

*asked on May 19, 2011* -
## math

The second of two numbers is 7 times the first. Their sum is 72. Find the numbers.

*asked on April 20, 2013* -
## chemistry

I have a worksheet that has a question on it the question states: How much iron can be recovered from 25.0 g of Fe2O3 and that is all i have i have just started in the middle of this class can i have an explanation of how to get to the answer please?

*asked on October 26, 2012* -
## Physics

You ride your bicycle down a hill, maintaining a constant speed the entire time. 1. As you ride, does the gravitational potential energy of the Earth-bike-rider system increase, decrease, or stay the same? 2. Does the kinetic energy of you and your bike

*asked on May 23, 2011* -
## chemistry

The normality of Hv2SOv4 is given as 0.20 N for a reaction in which the Hv2SOv4 furnishes two hydrogen ions. What is the molarity of the Hv2SOv4? A. 0.40 M B. 0.30 M C. 0.20 M D. 0.10 M

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

Mr Mike plants cabbages in a square grid so that the number of rows and columns are equal. He increased the size of his garden eqully in rows and columns to create a new patch that could grow 211 additional cabbages at the same spacing. How many cabbages

*asked on October 8, 2009* -
## math

i don't know how to work these problems out so i'll just pick a random one out from my home work and if someone could explain it to me step by step that would be very helpful. Solve the tragicomic expression for all answers between 0 degrees and 360

*asked on May 15, 2008* -
## Science

Read the statment and then say which answer is right, why its right and why the others are wrong. I think the answer might be D but I don't know how to explain it or if it is even right. A biologist marked a cell which she knew was about to undergo

*asked on December 18, 2007* -
## geography

What physical features are significant in the locations of the major cities of the Middle East? Thanks!

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

A trainer for a professional football team keeps track of the amount of water players consume throughout practice. The trainer observes that the amount of water consumed is a linear function of the temperature on a given day. The trainer finds that when it

*asked on March 3, 2015* -
## math

1. Ms.lynch has 21 coins in nickels and dimes. Their total value is $1.65. How many of each coin does she have? 2. A vending machine that takes only dimes and quarters contains 30 coins, with a total value of $4.20. How many of each coin are there?

*asked on April 20, 2013* -
## chemistry

How would set up a problem like this? A mass of 20.0 g of NaOH is dissolved in water to form 5.0 dm^3 of solution. What is the molarity of the hydrogen ion concentration if the temperature is 25 degrees Celsius?

*asked on January 11, 2011* -
## Math

A furniture company displays bedroom sets which require 21 square meters of space and living room sets which require 42 square meters of space. The company, which has 546 square meters of available space, wants to display at lease 6 bedroom sets and

*asked on June 28, 2010* -
## stats

The probability of receiving a false positive on a mammogram is 7%. If the patient receives 10 mammograms in her lifetime what is the probability that none of the tests come back as a false positive?

*asked on April 17, 2010* -
## Social Studies

According to Procopius two sixth century Christian monks undertook an elaborate smuggling operation to provide Byzantium with the expertise to produce what? A) steel B) iron C) ceramics D) gun powder E) silk

*asked on March 2, 2009* -
## US HISTORY

What effect did racial violence have on President Kennedy's approach to civil rights?

*asked on May 19, 2008* -
## Statistics

You are a real estate agent and you are trying to predict home prices for your clients that want to list their house for sale. You have a very small city without much data. You will need to use the data that you have available for the past year on homes

*asked on June 2, 2013* -
## Statistics

You are a real estate agent and you are trying to predict home prices for your clients that want to list their house for sale. You have a very small city without much data. You will need to use the data that you have available for the past year on homes

*asked on May 30, 2013* -
## physics

A truck of mass 8,000kg is traveling along a level road at an initial speed of 25m/s. The driver then shifts into neutral so that the truck is coasting, and the truck gradually slows to a final speed of 13m/s.

*asked on April 8, 2013* -
## math (algerba 1) Please help!

x+y=0 3x+y=-4 Sovle each system of equation by graphing. If got the answer (-3,3), but it's not there. Please explain!

*asked on January 16, 2013* -
## statistics

If a large number of people guess randomly on each of 100 items on a true-false test, the mean would be expected to be ì=___*, and ó=__*. • What % of the examinees would be expected to get a score of 65 or >?

*asked on October 4, 2011* -
## spanish

Please translate these words into a sentence. bebur, manuel, debe, aqua

*asked on September 16, 2011* -
## Math

paper = 10 point, 10 off for each day late. student missed 5 out of 10 and was 3 day late. what is the score?

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

A rectangular box measures exactly 72 cubic feet. What are its possible dimensions? Give 3 answers.

*asked on November 11, 2010* -
## Geography

In geography I'm doing pollution in antartica but I can't understand half the things on the websites I've looked at Help please!

*asked on May 21, 2009* -
## Trigonometry

this is a propf and I need both sides to equal each other. Thanks this one stumped me. sin^3x/(1-cosx) = sinxcosx+sinx

*asked on April 19, 2009* -
## Algebra

write the equation of the circle passes through the point (√5,0) and whose center is the origin

*asked on May 21, 2014* -
## Math

identify the center and radius of the circle with the equation (x+5)^2+(y-2)^2=9 A. this equation represents a circle with center (5,-2) and a radius of 3 units B. This equation represents a circle with center (-5,2) and a radius of 3 units C. this

*asked on May 21, 2014* -
## Math

identify the center and radius of the circle with the equation (x+5)^2+(y-2)^2=9 A. this equation represents a circle with center (5,-2) and a radius of 3 units B. This equation represents a circle with center (-5,2) and a radius of 3 units C. this

*asked on May 21, 2014* -
## Statistics

Calculate a linear regression, the residuals, and the correlation between two variables using the following info: number of people:12,14,15,18,20,16,14,13,18,19,20,22 and cost of drinks:24,30,36,38,65,44,36,30,39,76,80,85

*asked on May 30, 2013* -
## statistics

Estimate the tenure of someone that could have $5.8($k) and 15 years of job satisfaction. Make sure to state your multiple regression equation in your example. What are some of things that you can estimate from the model? How effective is evaluating the

*asked on May 30, 2013* -
## math check my answers

1. 2(x+3)squared-6x+5=0 Answer= 2xsquared+6x+23=0 2. 3xsquared-6x+5=-2(x+1)-10 Answer= 3xsquared-4x+17=0 How would I solve from this point?

*asked on April 3, 2013* -
## math

Write a number with 8 more in the tens place (The number is 498,763.14)

*asked on October 26, 2012* -
## PLEASE HELP: Chemistry

How many atoms of element "R" are present in 55.80 g of (AH3)4(R2O3)4 (molar mass = 478.17 g/mol)? Please help. I've tried going (g of molecule/mol)x(1 mol of molecule/ 55.80g)but I'm not really sure what to do with this.

*asked on October 14, 2010* -
## Physics

for imcomplete cancellation to occur, opposite pulses must have?

*asked on August 28, 2010* -
## algebra

im practicing simplifing expressions and have been given (-9a-9)5. should i use disstributing rule if not please explain how i would have to do this problem. thnx

*asked on October 3, 2009* -
## calculus

how do you solve the integral of 1/[(square root of x)(lnx)] from 2 to infinity? i did the p- integral theorem with 1/square root of x and got it to be a divergent integral. however i was told this was the wrong way and that i should do it by integration

*asked on August 25, 2009* -
## speech

i want to do a persuassive speech topic on animals but i was wondering what some of the options i have are. i was also thinking about doing one on exsessive homework, what kind of studies have been done on that?

*asked on February 26, 2008* -
## math--I am stumped

I am stumped please help me with this problem. ---- A man was walking down a path one day when a women appeared in front of it at exactly 8:06 AM. The next day, the man was walking down the same path, and the women appeared in front of it at 6:03 PM. The

*asked on July 12, 2008* -
## history

what are the main influences on central America & the Caribbean countries? a)Aztecs & Mayas b)ecotourism & communism c)the spice trade & shipping d)colonialism & slavery

*asked on December 11, 2007* -
## english

what does moral censure mean such as when used in the sentence plea bargaining conflicts with moral censure

*asked on October 24, 2007* -
## Trigonomic Identities

The question wants me to find sin(x/2) when cosx = -(12/13) in the interval (pi,3pi/2). I know that the eventual answer will be 5/sqrt26, however, I am not sure how to get there.

*asked on March 27, 2018* -
## Math (Trig Identities)

I am currently working on a problem relating to trigonometric identities and I seem to be stuck. The question wants me to find sin(x/2) when cosx = -(12/13) in the interval (pi,3pi/2). I know that the eventual answer will be 5/sqrt26, however, I am not

*asked on March 26, 2018* -
## Statistics

use the stem-and leaf plot below to answer questions 11-13. Assume that 30/0=300 30/0 31/2 2 32/1 5 33/0 3 6 34/4 5 7 8 35/1 1 2 9 How many numbers are in the original data set? 6 16 22 9 What is the largest number in the data set? 9 22 35 359 If this data

*asked on August 26, 2014* -
## Statistics

Calculate the residuals using the following info: number of people:12,14,15,18,20,16,14,13,18,19,20,22 and cost of drinks:24,30,36,38,65,44,36,30,39,76,80,85

*asked on June 2, 2013* -
## Physics

what force can cause the displacement of an object but does no work??

*asked on April 25, 2013* -
## Writing

What are some ideas for a title of an article on dances at school?

*asked on January 18, 2013* -
## physics

If an object is thrown up at an initial velocity of 9.8 m/s, what would be the magnitude of the final velocity upon impact with the ground? im doing an online class and i don't have a book so if you could explain some of the question that would be great

*asked on November 7, 2012* -
## physics

If an object is thrown up at an initial velocity of 9.8 m/s, what would be the magnitude of the final velocity upon impact with the ground? im doing an online class and i don't have a book so if you could explain some of the question that would be great

*asked on November 7, 2012* -
## Trig

prove sin(α+β)sin(α-β)=cos^2β-cos^2α

*asked on March 5, 2012* -
## Chemistry

Convert the value 8.1 x 10^15 ng/m3 to units of g/cm3. I am not sure how to do this kind of problem when the units are cubed. This is what I have so far. (8.1 x 10^15 ng/m3) x (1 g/ 1x10^9ng) x (1m/ 100cm) = 8.1 x 10^22

*asked on January 28, 2011* -
## Chemistry--Quick Question

Which of the following are LAWS according to the Scientific Method? It is possible for more than one answer. a. The volume of a gas is inversely proportional to its pressure. b. A solid has a mass of 100.0 grams and a volume of 11.1 mL. c. When a piece of

*asked on January 18, 2011* -
## chemistry

What is the gram equivalent mass? In a reaction of Hv3POv4 with a base, three protons are donated for each formula unit of Hv3POv4. What is the gram equivalent mass of Hv3POv4?

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

"A 25.0% solution of Al2(SO4)3 has a density of 1.75 g/ml. What is the mass of dissolved solute in 40.0 ml of solution?" How would one set this problem up?

*asked on December 8, 2010* -
## Chemistry

How many atoms of element "R" are present in 55.80 g of (AH3)4(R2O3)4 (molar mass = 478.17 g/mol)? Please help. I've tried going (g of molecule/mol)x(1 mol of molecule/ 55.80g)but I'm not really sure what to do with this.

*asked on October 15, 2010* -
## Chemistry

Hello, I am looking just for someone to tell me how I go about doing this problem, ie. the formula that i would need to know for it. I would really like to figure it out on my own but I'm not sure how to. The mass ratio of Kr to F in a particular compound

*asked on September 30, 2010*

## Pages

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