# Posts by Natalie

Total # Posts: 664

**Maths**

WhAt is x 3x9^x=81

*December 1, 2013*

**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 ...

*November 11, 2013*

**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...

*November 11, 2013*

**Math**

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

*November 6, 2013*

**math**

Rodney is able to package and ship 416 cards in an 8 hour work day. Write an equation to represent Rodney's rate, where h represents hours and c represents total number of cards

*October 16, 2013*

**Chemistry**

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

*October 14, 2013*

**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....

*October 10, 2013*

**Chemistry**

for both? and then add them?

*October 10, 2013*

**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?

*October 10, 2013*

**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?

*October 10, 2013*

**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?

*October 9, 2013*

**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

*October 6, 2013*

**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

*October 6, 2013*

**Language Arts**

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

*September 30, 2013*

**Language Arts**

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

*September 30, 2013*

**Language Arts**

can you help with a thesis statement about the history?

*September 30, 2013*

**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?

*September 30, 2013*

**Language Arts**

I want to also incorporate the history

*September 30, 2013*

**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.

*September 30, 2013*

**Language Arts**

3 main points for a speech on the alphabet

*September 30, 2013*

**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.

*September 24, 2013*

**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

*September 9, 2013*

**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.

*September 4, 2013*

**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 ...

*September 4, 2013*

**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 &...

*September 4, 2013*

**Biomechanics**

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

*July 31, 2013*

**math find the max/min**

f(x) = x2 + 2x - 9

*July 21, 2013*

**math**

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

*June 3, 2013*

**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?

*May 22, 2013*

**math URGENT thx**

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

*May 22, 2013*

**math**

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

*May 21, 2013*

**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...

*May 6, 2013*

**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 ...

*April 22, 2013*

**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?

*April 21, 2013*

**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.

*April 20, 2013*

**5th grade math**

I got nothing.

*April 15, 2013*

**math**

thx so much!!!

*April 14, 2013*

**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...

*April 14, 2013*

**math**

thank u

*April 11, 2013*

**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?

*April 11, 2013*

**Precalc with Trig**

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

*April 11, 2013*

**Precalc with Trig**

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

*April 11, 2013*

**Precalc with Trig**

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

*April 7, 2013*

**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

*April 7, 2013*

**Precalculus with Trig**

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

*April 7, 2013*

**Precalculus with Trigonometry**

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

*April 7, 2013*

**Precalculus with Trigonometry**

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

*April 7, 2013*

**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?

*April 6, 2013*

**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...

*April 4, 2013*

**Precalculus with Trigonometry**

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

*April 4, 2013*

**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).

*April 4, 2013*

**Precalculus with Trigonometry**

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

*April 4, 2013*

**5th grade math**

0.2

*March 28, 2013*

**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

*March 28, 2013*

**Life orientation**

community organizations that are involved in supporting HIV

*March 28, 2013*

**Life orientation**

Community organizations that are involved in supporting HIV

*March 28, 2013*

**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.

*March 28, 2013*

**Math**

Which sentence will give the best estimate

*March 25, 2013*

**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.

*March 17, 2013*

**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?

*March 17, 2013*

**government**

During its early history, the British Parliament _____.

*February 28, 2013*

**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 ...

*February 27, 2013*

**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?

*February 12, 2013*

**math6**

7,141.5

*February 4, 2013*

**math**

all you need to do is round both numbers up so all you do is 0.06*13=0.78

*January 23, 2013*

**Accounting**

Was this job legit?!? Just wondering I don't wanna waste my time if it's not.

*January 19, 2013*

**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?

*January 18, 2013*

**math**

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

*January 15, 2013*

**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...

*January 14, 2013*

**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!

*December 9, 2012*

**possesive nouns**

The sister of Miguel woke him up

*December 6, 2012*

**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?

*December 6, 2012*

**Chemistry**

69.3 additional BaCl2

*November 30, 2012*

**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...

*November 16, 2012*

**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...

*November 16, 2012*

**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...

*November 16, 2012*

**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...

*November 16, 2012*

**Physics**

Compute the final temperature.

*November 12, 2012*

**Physics**

A Jaguar XK8 convertible has an eight-cylinder engine. At the beginning of its compression stroke, one of the cylinders contains 499 cm ^ 3 of air at atmospheric pressure (1.01\times 10^5 Pa}) and a temperature of 27.0 degrees C. At the end of the stroke, the air has been ...

*November 12, 2012*

**Physics or Math**

Yay thanks, thought it was simple thank you.

*November 9, 2012*

**Physics or Math**

I thought maybe I mixed up the order, and that I should have done (3,0,0) - (-1.3,2.4,0), point minus "effective origin" (the rotation axis) which makes more sense, this changes it to 12.67k, is that correct?

*November 9, 2012*

**Physics or Math**

A force F = 0.8 i + 2.5 j N is applied at the point x = 3.0 m, y = 0 m. Find the torque about the point x = -1.3 m, y = 2.4 m. Hmm, (this is essentially just a vector problem) I know you're supposed to find the position vector r and take the cross product of r x F, the ...

*November 9, 2012*

**math**

3 sail boats to 6 fan boats

*November 6, 2012*

**Math**

The panels for the Pulsar 32-inch TV are manufactured in three locations and then shipped to the main plant for final assembly. Plants A, B, and C supply 50%, 30%, and 20%, respectively of the panels.The quality-control department of the company has determined that 1% of the ...

*November 5, 2012*

**Physics**

An Earth satellite moves in a circular orbit at a speed of 5800 m/s. a)What is the radius of the satellite's orbit? b) What is the period of the satellites orbit in hours?

*October 23, 2012*

**physics**

A mass of 2.6 kg lies on a frictionless table, pulled by another mass of 4.7 kg under the influence of Earth’s gravity. The acceleration of gravity is 9.8 m/s2 .If the acceleration of the object has a magni- tude of 3.5 m/s2, what is the angle θ between the two ...

*October 12, 2012*

**early child care**

D.

*October 11, 2012*

**Physics**

You will fire the spring gun 3 times from the first detent and measure the change in height of the (pendulum + ball) for each shot. Write the equation for the change in height of the first shot.

*October 11, 2012*

**algebra**

M --- +. 5= -2 3.

*October 6, 2012*

**Early childhood education**

For this assignment, you are asked to design a Plan-Do-Review activity. Be sure to describe in detail each stage of the process (student involvement in the planning, what students would actually do, and what specific questions you would ask during the review stage of the ...

*October 3, 2012*

**Stats**

A large population has a mean of 200 and a standard deviation of 40. Which one of the following best describes the percentage of measurements that fall in an interval that is within two standard deviations of the mean?

*September 14, 2012*

**Physics**

The function ax(t) describes the acceleration of a particle moving along the x-axis. At time t=0, the particle is located at the position x0 and the velocity of the particle is zero. ax(t)=a0e−bt The numerical values of all parameters are listed below: x0=980 m a0=500 ...

*September 1, 2012*

**Physiology**

Why does a solution of Haemolysed red blood cells look clear instead of cloudy?

*July 30, 2012*

**Chem**

Can a 100ml sample of 3.0m H2 SO4 could be neutralized by 100 ml of 3.0m NH3

*July 16, 2012*

**College Physics**

A person who is properly constrained by an over-the shoulder seat belt has a good chance of surviving a car collision if the deceleration does not exceed about 30 "g"s (1.0 g= 9.8m/s^2) Assumind uniform deceleration of this calue calculate the distance over which the...

*July 2, 2012*

**Physics PLEASE HELP!**

How many molecules are there in 0.029 moles of carbon dioxide gas, CO2? I asked this today, and the person told me to do 0.029 * 6.022e23 and my answer was wrong :/ Can someone please tell me what my answer should be!!?

*June 20, 2012*

**Physics**

How many molecules are there in 0.029 moles of carbon dioxide gas, CO2?

*June 20, 2012*

**phsical science**

a tire contains air ata pressure of 2.8 bar at 10 degree celsius.if the tires volume is unchanged what will the air pressure in it be when the tire warms up to 35 degree celsius if the car is driven.

*June 20, 2012*

**scaled math question**

In a scale drawing, 1/2 inch represents 3 feet. If the same scale is used, how many inches will be needed to represent 24 feet?

*June 2, 2012*

**Chemistry**

If 45.5 mL of He at 25.0°C and 101.3 kPa were heated to 75.0°C, what would be the volume?

*May 28, 2012*