Thursday
July 24, 2014

Posts by Natalie


Total # Posts: 480

Calculus
For f(x)=2(x+5)^3 +7 Find and classify the extreme values, determine where the function is increasing and decreasing, where it is concave up and concave down, and any points of inflection. I understand this is using the first and second derivative tests, but I can't find a...

calculus
Find a point c satisfying the conclusion of the Mean Value Theorem for the function f(x)= x^1/3 on the interval [1,8] I got f'(c)= 1/7 but am not sure where to go from there.

Calc
A cup of coffee at 90 degrees celsius is put into a 30 degree celsius room when t =0 . The coffee's temperature, f (t ) , is changing at a rate given by f '(t )=-8(0 .8) t degrees celsius per minute, where t is in minutes. Estimate the coffee's temperature when t =...

Calc
Nevermind! Solved it. Sorry guys. :)

Calc
t 0 5 10 r(t)0 90 0 A shop is open 9 AM - 7 PM. The function r(t), gives the rate at which customers arrive (in people/hour) at time t, where t measures time in hours since 9 AM. Suppose that the salespeople can serve customers at a rate of 75 people per hour. At 4 hrs after o...

Calc
q 0 125 250 375 500 625 750 C'(q) 27 35 41 45 43 46 51 Give fixed cost = 8800 and cost of producing 250 units is 17425, how much would the total cost increase if production were increased one unit, to 251 units?

History
Why should Uncle Toms Cabin be a part of the US History curriculum? Please explain!

History
Can you please tell me what chapters you found that information from so I can state it?

History
Yes but I cant put it into words.

History
In Uncle Tom's Cabin, (the book) did blacks have a racial caste system? Please explain

calculus
What is the derivative of y=sin^3(x)+sin(x^3) ?

Chemistry
What kind of compound is table salt and how does it dissolve in water? Would salt dissolve in vegetable oil? Why or Why not?

Chemistry
Predict which compound will have the higher boiling point and explain how you made your choice by including intermolecular forces. 1. H2O or CH2O 2. CS2 or CH4

Chemistry
Iodine 131 is a radioactive isotope. After 4.00 days, 70.8% of a sample of 131I remains.What is the half life of 131I?

Chemistry
The density of solution of sulfuric acid is 1.29 g/cm3, and it is 38.1% acid by mass. What is the mass, in grams, of 25.0 mL of sulfuric acid?

Statistics
The ABC Self-Concept Inventory has a split- half reliability coefficient of 0.90 and the XYZ Self-Concept Inventory has a Spearman- Brown reliability coefficient of 0.90. And if all factors are equal, which instrument would be chose to use?

Math
Which expression is equivalent to 9(4+r)?

statistics
If an instrument requires some professional judgments in scoring, then the manual should also include information on a. Interrater RELIABILITY b. Corrections of the reliability coefficients using the Spearman-Brown formula c, Both KR 20s and KR 21s d. Test retest reliability c...

Social Studies (History)
How can Fred Korematsu be compared to Homer Plessy?

Social Studies (History)
What were three effects of World War 2

Social Studies (History)
I think that those countries wanted Dictators because they weren't powerful enough to make their own decisions.

Social Studies (History)
Why did Germany, Japan, Italy, and Soviet Union all move to dictatorship?

chem
Wow, I feel stupid...I need some sleep. Thanks so much!!

chem
Ok then, I got 750.81 torr. I know that Partial pressure = total pressure x the mole fraction Does this mean that I have to find moles of O2 and H2?

chem
I got .988atm, but what do I do with the temp?

chem
A sample of oxygen gas was collected via water displacement. Since the oxygen was collected via water displacement, the sample is saturated with water vapor. If the total pressure of the mixture at 26.4 °C is 725 torr, what is the partial pressure of oxygen? The vapor pres...

chemistry
What is the density (in grams per liter) of a gas at STP if 4.16 L of the gas in a bulb at 43.7 °C, and 737.9 mm Hg weighs 0.262 g?

Chemistry
(NH4)2S is a strong electrolyte. Determine the concentration of each of the individual ions in a 0.200 M (NH4)2S solution. [NH4] = M [S] = M

chemistry
Knowing the concentration of a solution allows us to find all of the following except A. the mass of a solute. B. the mass of the solvent. C. the volume of the solvent. D. the concentration of a solution when conditions change.

Algebra
Neil gets in an elevator at the 30th floor and it begins to move downward at a speed of 8 feet per second. After 12 seconds the elevator is 240 feet above ground. a. Let y= the height in feet of the elevator 'x' secinds after Neil got in. Write an equation to show the ...

Maths
WhAt is x 3x9^x=81

Chemistry
Assume that the normal blood buffer contains 0.00080 M carbonic acid and 0.0085 M hydrogen carbonate, the pKa = 6.35 for carbonic acid and the volume of blood in the body is 7.00 L. The blood pH, due to disruption is now 7.20. What is the ratio of [HCO3−]/[H2CO3] now tha...

Chemistry
If you need to prepare 250.0 mL of a pH 5.00 buffer that has a total buffer concentration of acetic acid + sodium acetate of 0.050M, how many moles of each will you need to prepare the solution? Given solutions of acetic acid and sodium acetate with concentrations of 0.10M and...

Math
How do you factor 12v^2-25v-7?

Chemistry
How many lone pairs are in a chlorite ion (CLO2)- ?

Chemistry
What would be the speed of the following particles if they had the same wavelength as a photon of green light (λ = 500.0 nm)? Proton (mass = 1.673*10^(-24)g) =_____ neutron (mass = 1.675*10(-24)g) =_____ electron (mass = 9.109*10^(-28)g) =_____ alpha particle (mass = 6.64...

Chemistry
for both? and then add them?

Physics
I need to explain and demonstrate mathematically why it is easier to pull a wheelbarrow than it is to push it. Also, what effect does the component of force parallel to a bicycle crank have?

Physics
I need to explain and demonstrate mathematically why it is easier to pull a wheelbarrow than it is to push it. Also, what effect does the component of force parallel to a bicycle crank have?

Physics
I need to explain and demonstrate mathematically why it is easier to pull a wheelbarrow than it is to push it. Also, what effect does the component of force parallel to a bicycle crank have?

Physics -URGENT-
A 55 kg boy and a 37 kg girl use an elastic rope while engaged in a tug-of-war on a frictionless icy surface. If the acceleration of the girl toward the boy is 2.4 m/s^2, determine the magnitude of the acceleration of the boy toward the girl in m/s^2

PHYSICS
55 kg boy and a 37 kg girl use an elastic rope while engaged in a tug-of-war on a frictionless icy surface. If the acceleration of the girl toward the boy is 2.4 m/s 2 , determine the magnitude of the acceleration of the boy toward the girl in m/s^2

Language Arts
i have info about when it was invented and where it got its name from

Language Arts
yes I have some info on the history of the alphabet already.

Language Arts
can you help with a thesis statement about the history?

Language Arts
I am going to start with the history/ origin of the alphabet. Then I am going to talk about how it influences communication. What would be another point to sum that up?

Language Arts
I want to also incorporate the history

Language Arts
Its an informative speech on the alphabet.I want to talk about how the alphabet is essential in our daily lives and how everything in some form is based on knowing and understanding of the alphabet.

Language Arts
3 main points for a speech on the alphabet

math
suppose that an employee ears $28,000 in the first year on the job. Each year thereafter, the employee receives a %3 raise. Find the total amount that the employee earned in all 20 years.

social studies
which of the following groups benefitted the least from the prosperity of the second industrial revolution? a .textile workers b. railroad workers c. factory workers d. famers

Physics
I'm sorry, yes that is what I meant, but the difficulty I'm having is solving for z. I get it to a certain point and then I get stuck.

Physics
Consider the equation v = 1/8zxt2. The dimensions of the variables v, x, and t are [L]/[T], [L], and [T], respectively. The numerical factor 8 is dimensionless. What must be the dimensions of the variable z, such that both sides of the equation have the same dimensions? (Use t...

physics
The drawing shows a person looking at a building on top of which an antenna is mounted. The horizontal distance between the person's eyes and the building is L = 81.0 m. In part (a) the person is looking at the base of the antenna, and his line of sight makes an angle of &...

Biomechanics
What will be the vertical velocity at take off for a high jumper in order for them to clear a height of 2m?

math find the max/min
f(x) = x2 + 2x - 9

math
What is the solution of the equation |2-x | =3

Pre-calculus
As you drive down a mountain, you see a sign that says there is a 6 degree grade over the next 5 miles. What is the change in elevation over that 5 mile stretch?

math URGENT thx
what is the rule? x 5 7 9 11 y 1 1.6 1.8 2.2

math
what is the rule? x 5 7 9 11 y 1 1.6 1.8 2.2

Math
The AC voltage coming out of a standard wall plug in the United States can be expressed as the function V(t) = 120sin(120*pi*t), where t represents time (in seconds) and V is the voltage. We will let t be greater than or equal to 0 for simplicity. A. Make an accurate sketch of...

Precalculus with Trigonometry
Calculate the work done by gravity as a 10 kg object is moved from point A = (0,0,0) to point B = (1,2,0). We are given s = (x sub f - x sub I)x(hat) + (y sub f - y sub I)y(hat) + (z sub f - z sub I)z(hat). Sorry if that doesn't make sense. I think I have to plug in the nu...

Math
If a Ferris wheel has a 64 m radius and the center ot the wheel is 84 m above the ground, what is the height of a carriage above the ground starting from 0 degrees to 360 degrees?

orchestra programs????????
New York Jazz Workshop if you're willing to commute to NY. They have fabulous programs for teens under a great teacher/performer.

math
thx so much!!!

math
Triangle ADE is inside rectangle ABCD. Point E is half way between points B and C on the rectangle. Since AB is 8 cm and side AD is 7 cm. 1. what is the area of triangle ADE? 2. what is the ratio of the area of the triangle ABE to the area of triangle ADE? 3. What is the ratio...

math
thank u

math
Raymond is planting a border of 48 seedlings that will completely surround a rectangular garden. He wants to plant the seedlings 2 feet apart. If the garden plot is 30 feet long, how wide should it be?

Precalc with Trig
There isn't a typo this is the equation my professor gave us, thanks for the help!

Precalc with Trig
What value(s) of x from 0 to 2pi solve the following equation: cos squared x - cos x - 6 = 0

Precalc with Trig
No, I don't just my professor trying to trick us, thanks for the help!

Precalc with Trig
What value(s) of theta (0 less than or equal to theta less than or equal to 2pi) solve the following equation: cos squared theta - cos theta - 6 = 0

Precalculus with Trig
Rewrite the following expression as an algebraic expression in x: cos(arcsin(x))

Precalculus with Trigonometry
Graph f(x) = sin(3x)/sin(x) - cos(3x)/cos(x) and make a conjecture. Prove your conjecture.

Precalculus with Trigonometry
Prove or disprove the following identity: cos (x+pi/6) +sin (x-pi/3) = 0

math
A model of a park was built on scale of 1.5cm to 50m. If the distance between two trees in the park is 150m, what is the distance on the model?

Precalculus with Trigonometry
Prove or disprove the following Identities: cos(-x) - sin(-x) = cos(x) + sin (x) sin raised to the 4 (theta) - cos raised to the 4 (theta) = sin squared (theta) - cos squared (theta) cos (x+(pi)/(6)) + sin (x - (pi)/(3)) = 0 cos(x+y)cos(x-y) = cos squared (x) - sin squared (y)...

Precalculus with Trigonometry
Draw and solve any triangles satisfying alpha = 20 degrees b = 10 c = 16

Precalculus with Trigonometry
What values of theta between 0 and 2pi solve the following equation? sin squared (2theta)-sin(2theta)-2=0 NOTE: if you choose to plot this, a good WINDOW is (0,2pi) x (-3,3).

Precalculus with Trigonometry
Prove or disprove the following identity: (sin(10x))/(sin(x)+sin(9x)) = (cos(5x))/(cos4x))

Life orientation
In 10 to 15 lines critically discuss 5 ways in which human or environmental problem impact on the community.Provide relevant sources to support

Life orientation
community organizations that are involved in supporting HIV

Life orientation
Community organizations that are involved in supporting HIV

Life orientation
In 10-15 lines,critically discuss 5 ways in which human or environmental problem impacts on the community.Provide relevant sources to support your claims.

Math
Which sentence will give the best estimate

Physics
A transformer has 25 turns in the primary coil and 200 turns in the secondary coil. If 12 V is connected to the primary coil and a 20-Ω device is connected to the secondary coil, calculate the current in Amperes passing through the device.

Physics
The primary of a step-down transformer connected to a 240 V source has 1000 turns. The secondary has 100 turns. What is the output voltage of this transformer?

government
During its early history, the British Parliament _____.

satistics
assume the probability that an electronic device will have a type 1 defect is 1% and the probability that it will have a type 2 defect is 2%. given that these two defects are not independent ,what is the probability that an item randomly selected has both a type 1 and type 2 d...

math
A rope is used to hold a tree upright. it is attached to the ground at a distance of 95 feet from the tree and forms an angle of 47 degree with the ground. How long is the rope to the nearest foot?

Math
Jen-Min wants to enlarge a 4 inch by 6 inch photo so that the longer side will be forteen inch how long will the shorter side be?

math
if part a of a square is one fourth and part c is one tenth then what is part b?

Math
A ship is traveling due north. Every 30 mins,the captain corrects his course by a certain number of degrees.Here are the corrections made during the first four hours of the voyage: 5,-7,3,2,-6,8,-4,-6 ps theres degrees in the numbers Note:in marine Navigation the course is the...

Social Studies
What did railroads contribute to the development of the west? Pls Help! Soical studies is my worst subject ever! Thanks if you can help!

possesive nouns
The sister of Miguel woke him up

3rd grade math
Jeff rodé his bike around a bike trail that was 1/3 of a mile long.He rode around the trail 9 times.Write a fraction greater than 1 for the distance.How many miles did Jeff ride?

Chemistry
69.3 additional BaCl2

Chemistry
A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat losses, and that the specific heat (capacity)...

Chemistry
A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat losses, and that the specific heat (capacity)...

Chemistry
A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat losses, and that the specific heat (capacity)...

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