Friday

November 27, 2015
Total # Posts: 177

**Chemistry**

How long will it take for a 18.0-g sample of iodine-131 to decay to leave a total of 2.25 g of the isotope? The half-life of iodine-131 is 8.07 days
*August 23, 2015*

**algebra**

The price of products may increase due to inflation and decrease due to depreciation. Derek is studying the change in the price of two products, A and B, over time. The price f(x), in dollars, of product A after x years is represented by the function below: f(x) = 12500(0.82)x...
*August 10, 2015*

**EXPONENTS**

thx Sue
*April 15, 2015*

**EXPONENTS**

Which is equal to 3^3/3^-1? A -81 B -1/81 C 1/81 D 81 The options totally confuses me because I thought it would have to be 3^2
*April 15, 2015*

**180g/l**

I want to make up a 180g/l solution acid using 98% Sulphuric Acid. How much H2SO4 do I use should I make a stock solution first.
*September 22, 2014*

**math**

The perimeter of a rectangle is 62 inches. If the length of rectangle is four inches less than four times the width find the dimensions.
*September 9, 2014*

**economics**

what are the consequences of providing welfare and subsidies in South Africa?
*September 8, 2014*

**algebra**

angles of a triangle The second angle of a garden triangle is four times as large as the first. the third angle is 45 degrees less than the sum of the other two angles. find the measure of each angle. 15 x 4=60 x 3 = 180 side a=15 side b = 60 sIDE C = 3
*August 24, 2014*

**Algebra**

H. If you are paid a weekly base salary of $200 plus an hourly wage of $5.00, determine an equation for finding your weekly gross pay (P) for t hours. Specify an amount between 25 and 50 hours worked for 1 week and determine your gross pay for that week. 200 weekly base salary...
*August 14, 2014*

**MATH**

Please help I am supposed to verify that cot^2x+tan^2x =sec^2xcsc^2x-2 I just can't seem to get the two equations to equal to each other.
*May 9, 2014*

**Chem**

A block of metal has a width of 3.2 cm , a length of 17.1 cm , and height of 5.2cm . Its mass is 1.2kg . Calculate the density of the metal
*September 12, 2013*

**Chemistry**

The question is: What is the molarity of the copper (II) chloride solution your teacher provided? Show calculations. Obtain the true molarity of the copper (II) chloride solution and calculate percent error. I have done this so far trying to answer the question: Molar Mass: (...
*April 23, 2013*

**chemistry**

Monosodium glutamate (aka MSG) NaC5H8NO4 is used as a food additive for flavor or as a preservative. a. what is the mass of MSG (g) that contains 545 mg sodium? b. calculate the percentage of each element present in MSG.
*April 12, 2013*

**chemistry**

A sample of hematite Fe2O3 has the mass 4.83 x 10 3 kg. a. how much iron (kg) can be extracted from this sample of hematite? b. what is the percentage of iron in this ore?
*April 12, 2013*

**chemistry**

A student needs to use a 0.750 mol sample of (NH4)2SO3 for an experiment: a. how many grams does she need to weigh out? b. how many formula units are in the sample?
*April 12, 2013*

**chem**

Body temperature is about 308K. On a cold day, what volume of air at 273K must a person with a lung capacity of 2.00 L breathe in to fill the lungs?
*February 23, 2013*

**English 102**

What is "Imagine there is no Heaven" by Salman Rushdie about? I was looking for a general summary because I don't understand
*February 5, 2013*

**Chemistry :(**

Calculate the molality, % percent composition by weight, and the mole fraction of HCl in an aqueous 12M HCl solution that has a density of 1.20 g?mL Please help :(
*January 22, 2013*

**Math**

The amount of money Kylie spends on food to the amount she spends on gas per week is 7:4. She spends $45 more on food than gas. How much does she spend on food? How much does she send on gas? On one of the weeks, she spends an additional $75 on food for a dinner party. What is...
*January 16, 2013*

**statistics**

An insurance company charges its policy holders an annual premium of $200 for the following type of injury insurance policy. If the policy holder suffers a "major injury" resulting in lengthy hospitalization, the company will pay out $15,000 to the injured policy ...
*September 24, 2012*

**Math-Stats**

An insurance company charges its policy holders an annual premium of $200 for the following type of injury insurance policy. If the policy holder suffers a "major injury" resulting in lengthy hospitalization, the company will pay out $15,000 to the injured policy ...
*September 24, 2012*

**Calculus**

The percentage of the moon's surface that is visible to a person standing on the Earth varies with the time since the moon was full. The moon passes through a full cycle in 28 days, from full moon to full moon. The maximum percentage of the moon's surface that is ...
*August 23, 2012*

**Calculus**

How would you begin this problem? On a standard summer day in upstate New York, the temperature outside can be modeled using the sinusoidal equation O(t) = 11 cos (pi/12 t) + 71, where t represents the number of hours since the peak temperature for the day. For 0 less than or ...
*August 22, 2012*

**Calculus**

What will the graph look like for two full periods?
*August 22, 2012*

**Calculus**

What would the values of A, B, and C be in this problem? The tides in a particular bay can be modeled with an equation of the form d= A cos (Bt) + C, where t represents the number of hours since high-tide and d represents the depth of water in the bay. The maximum depth of ...
*August 22, 2012*

**Calculuc**

How do you set up this problem? The decay constant for the radioactive element cesium 137 is .023 when time is measured in years. Find its half-life.
*August 22, 2012*

**Maths**

I was given a question on number patterns. The queston states tha I must keep adding one table to increase the amount of seatings by keeping it in a square formation. I need to giv a general formula but I am struggling with the sequence
*April 4, 2012*

**Spanish-Please check my work**

Could someone please check this for me. I had to rewrite the following sentence using a direct object pronoun in two different ways. I wrote: Nosotros queremos leerlos. Los hosotros queremos leer. Thank you for checking
*January 29, 2012*

**Precalculus**

A nautical mile equals the length of arc subtended by a central angle of 1 minute on a great circle on the surface of Earth. If the radius of Earth is taken as 3960 miles, express 1 nautical mile in terms of ordinary, or statute, miles.
*January 12, 2012*

**History**

It doesn't give me any information about culture, language or religion? I could have looked it up on wikipedia myself, but I was looking for a more credible source. I thought this site was run by teachers and tutors.
*December 18, 2011*

**History**

The world can be divided into West (Occident) and East (Orient) Describe the origins of this division, and How are they... different in culture? language? and religion? Thanks for any and all help!!!
*December 18, 2011*

**Math**

Write the equation of the line passing through the point (-2, -4) and perpendicular to y= (-1/2x)-1
*December 14, 2011*

**Calc**

There should be two answers for each because there are two equations.
*December 14, 2011*

**Calc**

Evaluate the function at the given values of the independent variable and simplify. f(x)= {x^2)-3 if x is less than or equal to -2 {6x+1 if x > -2 a. f(-3) b. f(0) c. f(-2) How do I solve this/what are the correct answers so I can check my work?
*December 14, 2011*

**Calc**

Calculate the exact values of sin(theta) cos(theta) and tan (theta) when theta=240 degrees. How would I do this with and without a calculator?
*December 9, 2011*

**Math**

State the exact values of the following. cos(360 degrees) sec(7pi/2) tan(-9pi/2) How do I do these? Thanks!
*December 9, 2011*

**ENG 101**

Im taking my first college class in ENG 101 and i need to write an persuasive essay and Im having a hard time. I was wondering if anyone can help me come up with an outline or what I reasons that I can provide and I can come up with minor details. Here is the assignment: Final...
*December 2, 2011*

**math**

Suppose the ratio of the number of boys to the number of girls in a class is 7:3. What percent of the class is girls?
*November 14, 2011*

**science**

thanks ahah didnt mean to post twice
*October 24, 2011*

**science**

Aside from temperature change what is another but less major reason why sea levels might rise due to climate change?
*October 24, 2011*

**science**

Aside from temperature change what is another but less major reason why sea levels might rise due to climate change?
*October 24, 2011*

**Algebra 2**

81+76+82=239 239/3=79.6 81+81+76+82=320 320/4=80 your missing number or the grade you need to get is an 81 at least. if you make an 81. you will have an 80 as you average grade
*October 19, 2011*

**Math (please help)**

could you help me check my answers?
*October 19, 2011*

**Math (please help)**

thank you so much i have a whole page of these... im so confused!
*October 19, 2011*

**Math (please help)**

n/3-8=-2 what is n?
*October 19, 2011*

**Math**

one of them i 81
*October 19, 2011*

**Algebra**

5/2x-8/1=-3
*October 19, 2011*

**5th grade math**

9000
*October 19, 2011*

**math**

yes
*October 19, 2011*

**psy**

I have read prior post and my book but I can not figure out what is the connection between learning theory and mechanistic and reciprocal interactionism? I am not even sure if the definitions I have are correct although my answers were graded and excepted. Compare mechanistic ...
*October 12, 2011*

**Vocab./English**

i would say b) because the mother had little respect for you because the baby started crying if the baby was sleeping she would be thankful
*August 3, 2011*

**Chemistry**

I blanked how to solve this: How many grams of carbon dioxide are produced when 2.5 grams of sodium bicarbonate reacts with excess citric acid according to: 3NaHCO3+H3C6H5O7 -> Na3C6H5O7+3CO2+3H2O Could you include the steps, please? Thanks.
*June 15, 2011*

**calculus**

An open box is to be constructed so that the length of the base is 4 times larger than the width of the base. If the cost to construct the base is 5 dollars per square foot and the cost to construct the four sides is 3 dollars per square foot, determine the dimensions for a ...
*April 9, 2011*

**English-Please Help?**

John Updike's short story entitled "Son" covers four generations, correct-great grandfather, grandfather, father and son, correct? I dogpiled this and can't find anything on it. If anyone can direct me paragraph- by paragraph who is being spoken about, I'...
*February 17, 2011*

**English**

After reading the short story, we have to write a son's perspective in today's world and a father's perspective in today's world about their relationship- it's a little hard when I'm confused about what the short story is really about and I'm a girl...
*February 16, 2011*

**English**

Can someone direct me to where I can get an analysis of "Son" by John Updike-I have searched everywhere and I'm totally confused on this short story Thank you
*February 16, 2011*

**Math**

x^+y^=36 y=x+2 Find exact solution for the system of equations
*February 9, 2011*

**Math**

How do you find the solution to this system of equations? y=x+2 y=x(squared)
*February 9, 2011*

**Physics**

A mass-on-a-spring system has a spring constant k = 384 N/m and a mass m = 0.51 kg. (a) If it is given an initial displacement of 0.22 m and then released, what is the initial potential energy of the oscillator? = 9.29 J (b) What is the maximum kinetic energy of the oscillator...
*December 9, 2010*

**college chemistry**

I dont understand how I am supposed to give two separate half reactions.
*October 25, 2010*

**college chemistry**

HIO3 + FeI2 + HCl --> FeCl3 + ICl (in acidic solution) Show and label the two balanced half-reactions (oxidation and reduction). Add H2Os, H+s or OH-s as needed. I just wanted to know if the answer I got is correct 2FeI2 +6HCl +Cl +HIO3-->6FeCl3 +ICl +3H20
*October 25, 2010*

**college**

I dont know which are the half reactions.
*October 23, 2010*

**college**

HIO3 + FeI2 + HCl --> FeCl3 + ICl (in acidic solution) Show and label the two balanced half-reactions (oxidation and reduction). Add H2Os, H+s or OH-s as needed.
*October 23, 2010*

**Physics**

Hi, I posted this under my twin's account by accident-I'm Joelle Thank you
*September 23, 2010*

**Physics**

I had this question last night for Dr. Bob-A fox sees a piece of carrion thrown from a nest 14 m high and goes to get it. Carrion is thrown 1.5 horizontal velocity. Fox is 7. m from base of tree. What is mgnitude of fox's average velocity if it grabscarrion just as it ...
*September 23, 2010*

**Physics**

Forgot to say the wind is due east while the plane is traveling due west
*September 22, 2010*

**Physics**

So is the answer ever 2/3 greater than V plane or just 2/3 V-
*September 22, 2010*

**Physics**

I have a question An airplane is flying at 120km/h due west moves into a region where the wind is blowing at 40km/h. If the planes original velocity is Vplane, what is the expression for the plane's resulting velocity in terms of V plane? Answers are given 1/3 greater than...
*September 22, 2010*

**Physics**

I have a question An airplane is flying at 120km/h due west moves into a region where the wind is blowing at 40km/h. If the planes original velocity is Vplane, what is the expression for the plane's resulting velocity in terms of V plane? Answers are given 1/3 greater than...
*September 22, 2010*

**home work**

^*pertains
*September 5, 2010*

**chemistry**

what is the freezing point of pure acetic acid being stirred and not being stirred. also at what point does it become a solid then a liquid, and vice versa.
*July 10, 2010*

**Language**

It has to do with the game of polo. More than one pony per player is needed in order to allow tired mounts to be changed for fresh mounts between or even during chukkas. There are typically between 4 to 8 ponies per player. The group of ponies for a given player is commonly ...
*June 3, 2010*

**Biology**

The objective is to trace a drop of blood from an ear lobe capillary to a big toe capillary specifying all blood and heart structures it passes through. What would be a good website to refer to for help with this?
*May 22, 2010*

**Health**

Describe two approaches or indicators to measure patient outcomes. If I could locate a book on the subject I would, but I don't know of any resources. Thanks
*May 18, 2010*

**Chemistry**

Can someone explain what properties of carbon make it so versatile? Thank you
*May 17, 2010*

**Chemistry**

Which compound is a saturated hydrocarbon? ethane ethene ethyne ethanol Thanks for any help you can give
*May 3, 2010*

**math**

3. You recently started the paperwork to purchase a new home, and you were just notified that you can move into the house in 2 weeks. You decide to hire a moving company, but are unsure which company to choose. You search online and are interested in contacting two companies, ...
*April 25, 2010*

**math help**

Let u = [2,−3, 1] and v = [0, 1, 4]. Calculate the vector u − v. Place u and v tail-totail to form two sides of a triangle. With regard to this triangle, what does u−v represent? Calculate the number u•u and discuss its relevance to the diagram you have ...
*April 15, 2010*

**Biology**

What is the habitat and # of living species of: 1.single celled protozoa 2.joint legged arthopods 3.back bone chordates
*April 1, 2010*

**physics**

A 1.00-kg duck is flying overhead at 1.50 m/s when a hunter fires straight up. The 0.010 0-kg bullet is moving 100 m/s when it hits the duck and stays lodged in the duck's body. What is the speed of the duck and bullet immediately after the hit?
*March 29, 2010*

**Geometry**

A diameter of a circle is 32 yards long. A chord is 11 yards from the center. How long is the chord?
*March 24, 2010*

**Geometry**

How would you solve these? The radius of a circle is 34 meters long, and a chord of the circle is 60 meters long. How far is the chord from the center of the circle? The diameter of a circle is 60 inches and a chord of the circle is 48 inches long. How far is the chord from ...
*March 24, 2010*

**English**

I need to know what the summary of Imagine There Is No Heaven by Rushdie.I don't understand it at all
*March 15, 2010*

**math**

A: Solve the following equation: k2 + 4k = 0 A: By factoring B: By using the quadratic formula D: Do the results in A, B, differ from each other? Why or Why not?
*February 28, 2010*

**math**

Give the equation of a line perpendicular to the line y = -8x + 8 having the y-intercept 2 units below the y-intercept of the given equation. At what point the two equations cross each other?
*February 28, 2010*

**math**

Calculate the range, standard deviation, and interquartile range for the data set: {-1, 0, 1, 2, -1, 0, 1, 2, -1, 0, 1, 2, 1, 1, -2}
*February 27, 2010*

**HELP**

Did any members of the present court justices vote on the Hazelwood case in 1988? If any did, how did they vote? Who selects the justices, and how long do they serve on the court?
*February 3, 2010*

**Journalism**

I have descriptions of things and need to match people. I'm not sure who this is. Originally this news -gathering agency resembled a monopoly because of the power it possessed. At one time it was cpmposed of several agencies, principally in New York and the Midwest. A ...
*January 5, 2010*

**Math**

Find the length of segment BC if segment BC is parallel to segment DE and segment DC is a medsegment of triangle ABC. A(-3,4) E(4,3) D(1,1) B and C do not have coordinates
*January 5, 2010*

**Chemistry**

Explain in terms of forces between structural units why H2O2 has a higher melting point than C3H8. Also, which of the following has a lower melting point? NH3 or AsH3 C3H7OH or C2H5OCH3 I know that this has to do with hydrogen bonding. Can you possibly briefly explain ...
*December 9, 2009*

**English**

I am having trouble finding information on coffee makers for a modern invention project. I need information like where it was invented,purpose,where it's sold,customer,how much it costs, and other interesting info. If you have any recommandations for websited it would be ...
*December 6, 2009*

**Chemistry**

941 - 418 = 523 418 - 163 = 255 523 + 255 = 778 778/2 = 389 kj/mol (did it on mastering chemistry, answer was correct)
*November 11, 2009*

**9th grade**

i need help finding what these words are from these clues: possible opening found in the cell membrane substance which makes up cell walls granular material in the nucleus that thickens to become chromosomes the endoplasmic reticulum is a network of.... structures responsible ...
*September 15, 2009*

**Biology**

I need help with a crossword and I cant figure out what the words are too these clues: Possible opening found in the cell membrane substance which makes up cell walls granular material in the nucleus that thickens to become chromosomes the endoplasmic reticulum is a network of...
*September 15, 2009*

**math**

3x+2y = 0 x-2y = 0 If the system has infinitely many solutions, express your answer in the form x=x and y as a function of x Your answer is x=? y=?
*September 3, 2009*

**math**

Solve the system 6x+4y = 12 9x+6y = 18 If the system has infinitely many solutions, express your answer in the form x=x and y as a function of x x=? y=?
*September 3, 2009*

**Math**

<L and <M are complementary angles. <N and <P are complementary angles. If m<L = y-2, m<M = 2x+3, m<N = 2x-y, and m<P = x-1, find the values of x,y,m<L,m<M,m<N,and m<P. how do you work this out?
*August 30, 2009*

**Math**

If <BFA=3r+12 and m<= -8+210, find m<AFE. How do you work this out?
*August 30, 2009*

**English**

I have a research project and i have a specific topic, but i'm not sure of what to search for. Any suggestions? Research 19th century London. Dickens paints a rather dreary picture of London in the early 1800s. Is his depiction accurate or biased? What kind of city was ...
*August 23, 2009*

**Geometry**

Find the coordinates of the missing endpoint given that S is the midpoint of line RT. T(-4,3), S(1-,5) How do you work this out?
*August 19, 2009*