Tuesday
October 21, 2014

Posts by Kristin


Total # Posts: 183

Algerbra math
(7x^2+3x+9)+(2x^2+5x-2)
October 1, 2014

Calculus
2x -------- (x-2)(x+2) using partial fractions That's supposed to be a division sign of some sort
May 22, 2014

Calculus
WHat?
May 21, 2014

Calculus
find the co-ordinates y=x(2-x) where the gradient is 2
May 21, 2014

Calculus
Where did -h come from
May 21, 2014

Calculus
1/X by first principles
May 21, 2014

Calculus
A fragment of bone is discovered to contain 20% of the usual carbon-14 concentration. Estimate the age of the bone to the nearest hundred years, given that Carbon-1 is radioactive with half-life of 5730 years and the rate of decay is given by the following differential ...
May 21, 2014

Calculus
What do you mean my discs and shells?
May 21, 2014

Calculus
Find the volume of the solid generated by rotating about the y axis the area in the first quadrant bounded by the following curve and lines. y=x^2, x=0, y=2.
May 21, 2014

Survey Math help
A movie complex has eight different movie theaters. The manager of the complex wants to conduct a survey to determine which snacks to add to the menu. Which represents the best sample the manager could use for the survey? Would I do specific ages the first 100 randomly picked ...
May 1, 2014

Coordinates Math"Steve"
Is the proportional? x: 1 3 4 6 y: -4 -12 -16 -24 I think it is. Am I correct?
April 25, 2014

Geometery help
Ok I will thanks guys.
April 25, 2014

Geometery help"Steve"
The point Q(x,y) is reflected in the origin. Use arrow notation to describe the original point and its reflection. I chose this: (x,y) to (x,y) Am I right?
April 25, 2014

Help me solve??
Thank you for the steps that helps so much/. Thank you Steve!
April 25, 2014

Help me solve??
XYZ has vertices X(5,6), Y(9,12), and Z(12,8). it is translated right 8 units and up 3 units. What are the coordinates of X', Y', and Z' ?
April 25, 2014

Math
If you put me into 7 equal groups with 3 in each group and 5 are left over, what number am I?
March 6, 2014

what??
im not trying to fool anything this is not a name change.MS.SUE Im not trying to be disrecptful since you do help a lot of kids but I also have talking to a lot of kids to and they say that sometimes your very rude and mean....im just trying the help the guy @mathhelp123 he ...
January 8, 2014

math
he will help you mathhelp
January 8, 2014

math
I don understand this either
January 8, 2014

math
I just saw this guy post this here and I think he needs help??? A recipe calls for 4 pounds of fruit.you have 60 ounces of fruit. A.do you have as much fruit as you need? B.if not,how much more do you need?
January 8, 2014

history
trouser wearing members of a revolutionary uprising of the french working class were called the___________?
November 29, 2013

history
the ____ act required king______ 1 to convene parliament every three years. is it parliament,king charles?
November 29, 2013

PHYSICS
Two 75 kg hockey players skating at 5.50 m per s collide and stick together. if the angle between their initial directions was 120 degress, what is their velocity after the collision?
November 5, 2013

Chemistry
Anhydrous aluminum oxide can be reduced to aluminum according to thisa chemical equation: 2 Al2O3 (s) ---> 4 Al (l) + 3 O2 (g) Calculate the mass of aluminum oxide reacted if 82 g of Al was produced and the percent yield was found to be 89.3%
October 18, 2013

Chemistry
What mass of copper(II) nitrate would be produced from the complete reaction of 65.3 g of copper, according to the chemical reaction shown below? Cu + 2 AgNO3 ----> Cu(NO3)2 + 2 Ag Use the masses to two decimal places using the periodic chart in the front of your text. ...
October 18, 2013

chemistry
a. How many atoms of hydrogen are in 25.0 g of ammonia (NH3)? Use the format 6.02E+23 for 6.02 x 1023 b. How many atoms of nitrogen are in the same amount of ammonia? Use the molar mass to two decimal places found on the periodic table in the front of your text.
October 18, 2013

calculus
Meg's pension plan is an annuity with a guaranteed return of 4% per year (compounded quarterly). She would like to retire with a pension of $20,000 per quarter for 10 years. If she works 30 years before retiring, how much money must she and her employer deposit each quarter?
September 16, 2013

Chem
Caculate the volume of CO2 gas given off at 756 mm Hg and 23C when 150 kg of limestone(CaCO3) is heated until it decomposes according to the following reaction:CaCO3(s)=CaO(s)+CO2(g)
March 13, 2013

science
Which of the following is true about an object that floats in water? (1 point) The object is less dense than frozen water. The mass of the object is less than that of water. The density of the object is less than that of water. The volume of the water is greater than the ...
March 1, 2013

Physics
The focal length of the objective of a telescope is 0.2 m and the eyepiece has a focal length of 1.6 m. What is the length of the telescope? A. 1.8 m B. 1.4 m C. 1.6 m D. .90 m E. 8.0 m
January 20, 2013

english
Please help me write an essay. the question is "What do you think the theme is of Our Town and how is it shown?"
January 6, 2013

Math word problem
Patsy has cheerleading practice on every fourth school day. She wants to be in the school play, but they have practice on every sixth school day. If both started on September 5th, what would be the first date that she has to choose between cheerleading and play practice? I ...
December 5, 2012

Math help!
I got the same thing 3. our teacher we thought said to subtract the two middle and then divide it by two to get the median. We are confused.
October 10, 2012

Math help!
Mean 82 Median 3 Mode 81 The median? But I really do not understand it because it is such a low number? I am sorry I am trying to understand.
October 10, 2012

Math help!
It would have to be the median?
October 10, 2012

Math help!
The mean?
October 10, 2012

Math help!
Jack has the following scores on exams in his math class. 81, 87, 93, 89, 61, 81 If he wants to make his performance sound as good as possible, which measure should he use—the mean, the median, or the mode of his exam grades when he talks about how he is doing?
October 10, 2012

Math
oops! yes I forgot to divide by two! 19 is the median. And would that best represent the ages?
October 10, 2012

Math
so the mean is 16.75 The median is 12 right? Because I had to subtract the two middle numbers to get the middle number. The mode is 2 So would it be the median to represent the ages of the houses?
October 10, 2012

physics
The upward force is the same in both situations.
September 29, 2012

statistics
The average temperature in households is 67.6 degrees F. The standard deviation is 4.2 degrees F. A random sample of 51 households is to be selected What is the probability that the average of this sample will be within 1.4 STANDARD ERRORS of the population mean?
September 28, 2012

english
a good thesis statement on why teachers should have the authority to remove disruptive students from their classes permanently.
September 28, 2012

History
How did england change after its war with spain? and How did this change played a role and part in history by analyzing the magnitude and scope?
September 23, 2012

science
A conatiner filled with marbles weighs 435 grams. The container weighs 28 grams. What is the mass of the marbles?
September 18, 2012

education
I just need to know the steps required for a multicultural education to be effective
September 16, 2012

education
Read the following scenario: You are a second-grade teacher at Happy Valley Elementary School. You are teaching language arts and social studies. Your classroom of 21 students consists of 7 white students, 5 Latino students, 4 African American students, 3 Native American ...
September 16, 2012

Economics
2. If a firm increases all of its inputs by 60 percent and its output increases by 90 percent, then you know that: A) it is encountering diseconomies of scale. B) it is encountering economies of scale. C) it is encountering constant returns to scale. D) the marginal products ...
September 13, 2012

Economics
Suppose that a tour bus business incurred implicit costs of $600,000 and explicit costs of $7 million in a specific year. If the firm sold 125,000 tours at $60 per person, its accounting: A) profits were $100,000 and its economic profits were $500,000. B) losses were $100,000 ...
September 13, 2012

Chemistry
A rock sample contains only Sb2S3 and FeS. If 835g of the sample contains 11.2% antimony, what is the mass percent of the Sb2S3 in the sample? What is the mass percent of the sulfur in the sample? So far, I have determined that 11.2% of an 835g sample is 93.52g Sb, the molar ...
August 31, 2012

Chemistry
100 ml of 0.01N HCl is added to 0.9L of distilled water. What would the final pH of the solution be?
August 30, 2012

Introduction to HS
Ok, thank you very much for your help!!
July 25, 2012

Introduction to HS
I am having trouble with a question. In order to get an idea of significant subject areas in a chapter, it is best to read the. A. Subheads B. Graphics C. Captions D. Table of contents In my study guide it states : Read all the subheadings and sub-subheadings. These will give ...
July 25, 2012

business stat
1. Suppose quality control inspectors at the coffee house chain take a sample of 100 pieces of this chocolate product from an incoming shipment. They find a sample average of 60% cacao with a standard deviation of 8%. What is the standard error of the sampling distribution of ...
July 23, 2012

Chemistry
If you reclaim 0.250g Ag from AgNO3, how much AgNO3 did you have to begin with?
July 16, 2012

Physics
A 3.30-kN piano is lifted by three workers at a constant speed to an apartment 28.8 m above the street using a pulley system fastened to the roof of the building. Each worker is able to deliver 197 W of power, and the pulley system is 75.0% efficient (so that 25.0% of the ...
June 17, 2012

Physics
If a projectile is launched from Earth with a speed equal to the escape speed, how high above the Earth's surface is it when its speed is three-fifths the escape speed? I keep getting the answer 2.56x10^6 m after solving it a few different ways. Help would be great.
April 28, 2012

geometry
Factor 15x^2 - 8x - 16
March 8, 2012

algebra 2/math
how do i factor x^3+2x^2-x-2
February 29, 2012

algebra
X^2-4x=0
February 21, 2012

chemistry
design a simple lever that could be raised and lowered smoothly using niitinol wires.
February 16, 2012

Physics
A driver in a car traveling at a speed of 56.0 mi/h sees a deer 116 m away on the road. Calculate the minimum constant acceleration that is necessary for the car to stop without hitting the deer (assuming that the deer does not move in the meantime).
February 2, 2012

AP Chemistry
This is part of a marathon problem, we have to identify the five compunds of H, N, and O described below. For each compound, I have to write a Lewis structure that is consistent with the information given. a.) All the compunds are electrolytes, although not all of them are ...
December 4, 2011

Physics.
What is the transfer mechanism of energy, momentum, and angular momentum?
November 27, 2011

Physics help please
gets larger?
November 27, 2011

Physics help please
suppose you have 2 cars, and the larger one is twice as massive as the smaller one. If you and a friend push on them so that their accelerations are equal, how must the forces applied to the cars compare? a. the force on the larger car is equal to that on the smaller car. b. ...
November 27, 2011

algebra
Suppose D=(w+2)(w-3)(w+6).For what three values of w will D have a value of 0?
November 21, 2011

Chemistry
If solution A had a pH of 8, and solution B had 1,000 times this hydrogen ion concentration what would be the pH of solution B, and would solution B be acidic or basic?
November 14, 2011

trig
find the coordinates of the terminal point on the unit circle determined by t=9pt/7 to two decimal places
November 13, 2011

Physics
The position vector r of a particle moving in an xy plane is given by [r = (6t^3-3t)i + (4-1t^4)j] with r in meters and t in seconds. What is the angle between the positive direction of the x axis and a line tangent to the particle's path at t = 3 s? Give your answer in ...
September 25, 2011

Math
To subtract 91 from 99, do you need to regroup? Explain
September 19, 2011

Math
To subtract 91 from 99, do you need to regroup? Explain
September 19, 2011

3rd math
Bethany has 40 apples. Write a subtraction story about the apples that would require regrouping. Then write the answer in a complete sentence.
September 19, 2011

physics
a rocket blasts off and moves up with an acceleration of 12 m/s2 until it reaches 30 m then the engine shuts down and the rocket continues in free fall. What is the max hieght of the rocket and what is the total duration of the rockets flight?
August 31, 2011

chemistry
When 0.100 mol of carbon is burned in a close vessel with 8.00g of oxygen, how many grams of carbon dioxide can form?
July 24, 2011

grammar
A Superblade was used at the 2 o'clock position, and the anterior chamber was entered was used is a verb ,was entered is also a verb ,am i right
June 15, 2011

Thermodynamics
An intrepid explorer takes 400 g of ice from the cold Siberian environment, where the temperature is –40 degrees and places it in a kettle inside his mobile laboratory. The ice melts and he heats the water to +40 degrees. What is the total amount of heat absorbed by the ...
June 6, 2011

algebra
simplify and write using only positive exponents. thanks. (2x^3y^4)^-2 divided by (8xy^6)^-3
May 25, 2011

Chemistry
write the balanced equation for the ionization of the weak base pyridine, C5H5N, in water
May 8, 2011

chemistry dilutions
you have 47 mL of a 2 M stock solution that must be diluted to .5 M how much water should you add
May 5, 2011

calculus
The function f is continuous on the closed interval [0,6] and has values that are given in the table below. x |0|2|4|6 f(x)|4|K|8|12 The trapezoidal approximation for(the integral): 6 S f(x) dx 1 found with 3 subintervals of equal length is 52. What is the value of K? How do ...
May 2, 2011

Chem 100
at 1 atm how much energy is required to heat 67 grams of H2O(s) at -22 degrees C to H2O(g) at 159 degrees C
May 1, 2011

Math
50=n/2+26
April 11, 2011

4th grade math
Find a rule that gives the third number from the first two numbers. Fill in the blanks.....10, 4, 5, ? 15, 7,7, ? 19,9,?
March 17, 2011

Chemistry
I don't understand how you know what state designation things are in a chemical equation. For example this is given: 2 (NH4)3PO4 (__) + 3 Ba(NO3)2 ---> Ba3(PO4)2 (__) + 6 NH4NO3 (__) How do you just know what to put for their state or phase designation?
March 10, 2011

reimbursement methodologies
does anyone have answers to test 38181803 for penn foster
February 19, 2011

Physics
A coiled Hookean spring is stretched 10 cm when a 1.5kg mass is hung from it. Suppose a 4 kg mass hangs from the spring and is set into vibration with an amplitude of 12 cm. A. Find the force constant of the spring. B. Find the Maximum restoring force acting on the vibrating ...
February 16, 2011

algebra
-9 + 36 divided by 6 times 2 -(-6) - 5 +2 = ? I'm having trouble with the order of operations.
February 15, 2011

Math
estimate:42.9*7.84=
February 9, 2011

math
An urn holds 13 identical balls except that 2 are white, 4 are black, and 7 are red. An experiment consists of selecting two balls in succession without replacement and observing the color of each of the balls. How many outcomes are in the sample space for this experiment? How...
February 2, 2011

math
An urn holds 13 identical balls except that 2 are white, 4 are black, and 7 are red. An experiment consists of selecting two balls in succession without replacement and observing the color of each of the balls.
February 2, 2011

math
please explain how to get the answer to this question. five students make the following guesses on the number of jelly beans in a jar: 72, 78, 68, 60 and 84. the guesses were off by 14, 2, 4, 6 and 10 (not in order). how many jelly beans are in the jar?
January 27, 2011

math
five students make the following guesses on the number of jelly beans in a jar: 72, 78, 68, 60 and 84. the guesses were off by 14, 2, 4, 6 and 10 (not in order). how many jelly beans are in the jar?
January 26, 2011

general
kristin nhas found answers and no longer needs help thank you
January 25, 2011

general law
Dr. Bob applies for medical staff privileges at General Hospital. The hospital administrator? A. is not required to look into Dr. Bob’s background. B. is required to query the National Practitioner Data Bank. C. is required to query the Data Bank unless Dr. Bob is a ...
January 25, 2011

penn foster
Dr. Bob applies for medical staff privileges at General Hospital. The hospital administrator? A. is not required to look into Dr. Bob’s background. B. is required to query the National Practitioner Data Bank. C. is required to query the Data Bank unless Dr. Bob is a ...
January 25, 2011

law
Dr. Bob applies for medical staff privileges at General Hospital. The hospital administrator? A. is not required to look into Dr. Bob’s background. B. is required to query the National Practitioner Data Bank. C. is required to query the Data Bank unless Dr. Bob is a ...
January 25, 2011

law
news paper calls a rehab clinic and asks if a celebrity is a patient..clinic should: lie, tell ytruth, acknowledge shes there but give no details, say its prohibited
January 25, 2011

Physics
and for part d, take what the answer you got for c and plug all your variables into the equation of answer part c = .5 * .045 * v^2
December 3, 2010

Physics
for part c, the answer should be the exact same as part b.
December 3, 2010

Physics
for part b, take the amplitude (1.4) and square it and then multiply by what you got for part a. so PE = .5 * k * x^2 = .5 * .72 * 1.4^2
December 3, 2010

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