Monday

October 24, 2016
Total # Posts: 699

**Chemistry**

An unknown compound contains only C, H, and O. Combustion of 4.50 g of this compound produced 10.2 g of CO2 and 4.19 g of H2O. What is this empirical formula of the unknown compound?

*September 21, 2013*

**Math Homework, Help!!!! **

A marble statue is 39 years old and a limestone statue is 97 years old. In how many years will the limestone statue be twice as old as the marble statue?

*September 7, 2013*

**Algerbra**

i don't mean that

*August 29, 2013*

**Algerbra**

sure

*August 29, 2013*

**Algerbra**

3/4t-5/6=2/3t

*August 29, 2013*

**Algerbra**

Okay Thanks!!!

*August 29, 2013*

**Algerbra**

b=-8

*August 29, 2013*

**Algerbra**

2b=-16

*August 29, 2013*

**Algerbra**

2(4-2r)=-2(r+5)

*August 29, 2013*

**Algerbra**

But how did you get that answer? I tries 3 times and got a different answer

*August 29, 2013*

**Algerbra**

-2n=-46

*August 29, 2013*

**Physics**

a yellow lamp emits light with a wavelength of 6.00E-7 meters. Calculate the frequency of the yellow light.

*July 22, 2013*

**algebra**

(2X-Y)+7X(2X-Y)+10X

*July 18, 2013*

**math**

(X+2Y)+6X(X-2Y)+8X

*July 18, 2013*

**AP Calculus**

An open box is to be made from cutting squares of side 's' from each corner of a piece of cardboard that is 35" by 40". (a) Write an expression for the volume, 'V', of the box in terms of 's'. (b) Draw a graph of V(s). (c) State the domain and...

*July 17, 2013*

**Algebra**

thank you

*June 17, 2013*

**Algebra**

What is the factored form of 6x^4-21x^3-12x^2 ?

*June 17, 2013*

**Algebra**

Thank you to all

*June 6, 2013*

**Algebra**

A ball is thrown into the air. The height h, in feet, of the ball can be modeled by the equation h= -16t^2+20t+6, where t is the time, in seconds, the ball is in the air. When will the ball hit the ground? first should I use x= -b/2a?

*June 6, 2013*

**Algebra**

Sorry, I accidently clicked it an extra two times

*April 23, 2013*

**Algebra **

A circular mirror is surrounded by a square metal frame. The radius of the mirror is 5x. The side length of the metal frame is 15x. What is the area of the metal frame? Write your answer in factored form.

*April 23, 2013*

**Algebra **

A circular mirror is surrounded by a square metal frame. The radius of the mirror is 5x. The side length of the metal frame is 15x. What is the area of the metal frame? Write your answer in factored form.

*April 23, 2013*

**Algebra**

Thank you

*April 23, 2013*

**Algebra **

A circular mirror is surrounded by a square metal frame. The radius of the mirror is 5x. The side length of the metal frame is 15x. What is the area of the metal frame? Write your answer in factored form.

*April 23, 2013*

**Algebra**

How are the processes of adding monomials and adding polynomials alike? How are the processes different?

*April 22, 2013*

**Algebra**

Thank you.

*April 8, 2013*

**Algebra**

the angle of elevation from bottom to the top of the mountain has a measure of 60 degrees. suppose a ski lift to the top is 2000 feet long. how high is the mountain to the nearest feet? Am I suppose to find the sine of 60?

*April 8, 2013*

**ABC**

Do you mean how many integers are in between 21 and 47 inclusive?

*April 8, 2013*

**AP Chemistry**

Nevermind . . . the G value for Br2 isn't 0, which was throwing off my calculations. The answer ended up being 4.96x10^-20

*April 8, 2013*

**AP Chemistry**

So I have the reaction 2HBr(g) <--> H2(g)+Br2(g) I'm supposed to find the equilibrium constant, K, using free energy (G) values. The values in my textbook for G of H2 and Br2 were zero, and the value for HBr(g) was -53.5. So, to find delta G I did products - ...

*April 8, 2013*

**MATH**

But then when i try to factor i get 0=t^2-3t-12

*April 7, 2013*

**MATH**

WAIT ITS t^2 NOT 3t^2

*April 7, 2013*

**MATH**

Logv3(12) = logv3 (3t^2) - logv3 (3t) (the v means "log 3"- 3 is the base)

*April 7, 2013*

**Math**

Questions 22 , 23

*March 31, 2013*

**physics**

a proton (mass 1.67 x 10^-27 kg) with a velocity of 1.10 x 10 7 m/s collides with a motionless helium nucleus, and the proton bounces back with a speed of 6.00 x 10 6 m/s. The helium nucleus moves forward with a velocity of 4.00 x 10 6 m/s after the bombardment. What is the ...

*March 24, 2013*

**chemistry**

what is the molarity of a sodium hydroxide solution if 26.0mL of the solution os titrated to the end point with 57.5mL of a 0.500M hydrochloric acid solution

*March 8, 2013*

**Math**

A population of 75 foxes in a wildlife preserve quadruples in size every 15 yr. The function y= 75 * 4^x , where x is the number of 15 yr periods, models the population growth. How many foxes will there be after 45 years?

*March 7, 2013*

**math**

The answer is 280cm2, ill explain why... the picture's length is 60cm. The frame is 5 cm wide so u have to add five centimeters to the left and to the right which equals ten centimeters. 60+10=70cm. now you have to multiply four to it which = 280cm2 There.:D

*February 28, 2013*

**Algebra**

thank you

*February 26, 2013*

**Algebra**

Exponents: Simplify the expression 7ab^-2 / 3w I got 7a3w / b^2 Is this correct?

*February 26, 2013*

**Trig**

Whoops nevermind. I was thinking if they were 11pi/6 and -pi/6.

*February 19, 2013*

**Trig**

Is the angle 11pi/12 on the unit circle the same as the angle -pi/12? I'm thinking it would be, but I'm not sure.

*February 19, 2013*

**physics**

A 21.0-g metal cylinder is placed on a turntable, with its center 85 cm from the turntable's center. The coefficient of static friction between the cylinder and the turntable's surface is ìs = 0.83. A thin, massless string of length 85 cm connects the center of ...

*February 17, 2013*

**math 5th**

its 60 yards

*February 12, 2013*

**Algebra**

Solve the system of inequalities. y<2x+4 -3x - 2y> 6 So I just want y alone. For the second inequality, I added 3x to both sides and got -2y> 3x+6. Then I divided both sides by -2. I got y> -3/2 - 3 Do I have to switch the inequality symbol or something?

*February 12, 2013*

**algebra **

Write an inequality that describes the region of the coordinate plane not included in the graph of y<5x+1

*February 7, 2013*

**Algebra **

x+y=x-5 I want to get y alone on one side, so if I subtract x from both sides, what would be x - x?

*January 22, 2013*

**Alegbra **

Suppose the modified quota is 2.77. Fill in the blanks, and round your answers to two decimal places. (a) Find the lower quota. (b) Find the upper quota. (c) Find the arithmetic mean of the lower and upper quotas. (d) Find the geometric mean of the lower and upper quotas. (e) ...

*December 23, 2012*

**math**

what is the lcm of 11 5 and 4 please help

*December 13, 2012*

**Physical Science**

Greyhounds can accelerate at 7/m/s2 at a start of the race . How much force does it take a 35 kg dog to produce this acceleration?

*December 11, 2012*

**Physical Science**

How much force is required to give a 500kg crate an acceleration of 2 m/s2 on an icy surface without friction?

*December 11, 2012*

**Physical Science**

an object with a mass of 50kg is hurled at an acceleration rate of 30 m/s2. How much force was applied to the object?

*December 11, 2012*

**physical Science**

How much force is required to give an object with mass of 20kg an acceleration of 12m/s2 ?

*December 11, 2012*

**physical science**

on hole 9,Bill hit a golf ball. The golf ball weights 0.45 kg.The acceleration on the ball was 4/m/s2. What was the force of Bill swing?

*December 11, 2012*

**Physical Science**

Bill hit a ball with an acceleration of 40 ms2.The mass of the ball is 0.5kg. What is the force?

*December 11, 2012*

**Algebra **

Terrance skated 8 feet in 4 seconds at a constant rate how fast did he skate in feet per second

*December 10, 2012*

**biology**

Stem cells may open the door to discoveries about many diseases and may allow treatments for diseases to be developed. However many ethical issues surround stem cell research which need to be addressed by scientists, governments, etc. a. Explain why scientists would want to ...

*December 9, 2012*

**stem cells**

Stem cells may open the door to discoveries about many diseases and may allow treatments for diseases to be developed. However many ethical issues surround stem cell research which need to be addressed by scientists, governments, etc. a. Explain why scientists would want to ...

*December 9, 2012*

**physics**

A 20.0kg solid gold statue is raised from the sea bottom. What is the tension in the hoisting cable (assumed massless) when the statue is accelerating upward at 2m/s^2? (assume the statue is still completely underwater) The density of gold is 19.6x10^3kg/m^3

*December 9, 2012*

**physics**

A U-shaped tube contains a fluid of density 1.5x10^3 kg/m^3. the right side of the tube is closed, with vacuum above the fluid. The left side of the tube is open to the atmosphere. Assume the atmospheric pressure outside the tube is exactly 10^5 Pa. a) How much higher will the...

*December 9, 2012*

**Math**

set the equation to 0 and solve for t. you may have to use the quadratic formula...

*December 9, 2012*

**Math**

A rectangle is 6 cm long and 5 cm wide. When each dimension is increased by x cm, the area is tripled. Find the value of x.

*December 6, 2012*

**Physics**

A force of 310 N is applied horizontally to a crate in order to displace the crate 45.0 m across a level floor at a constant velocity. As a result of this work, the crate's internal energy is increased by an amount equal to 12 percent of the crate's initial internal ...

*December 4, 2012*

**math**

(1) 9.6 dividedby 1.2=8 (2) 57.8 divided by 3.4= 17 (3) 2.3 divided by 21.643= 941 (4) 0.51 dividd by 0.459= 9 (5) 0.16 divided by 3.8= 23 remainder 12 (6) 0.78 divided by 15.6= (7) 0.048 dividedby 7.2=150.0 help Ms. Sue

*November 29, 2012*

**MATHS**

thanks

*November 27, 2012*

**MATHS**

Find the area of the region bounded by the curve of sin x between x = 0 and x = 2π.

*November 27, 2012*

**MATHS**

A committee of two persons is selected from two men and two women. Find the probability that the committee will have at least one man.

*November 27, 2012*

**Algebra 1**

Find the final amount of an investment if $2,000 is invested at an interest rate of 8% compounded quarterly for eight years. Please and thank you! I`ve been having so much trouble with this question. Thank you!

*October 22, 2012*

**Physics**

Angela, you so fine<3

*October 22, 2012*

**Math. Increases again**

The worlds pop in 1970 is estimated to be 3.7*10^9. The yearly growth rate is approximately 2%. How large would the world's pop be in 1980? Would i use log functions? please help.

*October 13, 2012*

**Math. Increases**

Do I do log functions for this question?

*October 13, 2012*

**Math. Increases**

The worlds pop in 1970 is estimated to be 3.7*10^9. The yearly growth rate is approximately 2%. How large would the world's pop be in 1980? Please show work. Thanks :)

*October 13, 2012*

**Algebra 2**

The excursion boat on the river takes 2½ hours to make the trip to a point 12 miles upstream and to return. If the rate at which the boat travels in still water is 5 times the rate of the river current, what is the rate of the current? Which of the following equations ...

*October 13, 2012*

**Math.. due tomorrow morning!**

Assume that each female rabbit of a colony gives birth to three female rabbits. How many female rabbits of the tenth generation will be descendants of a singal rabbit of the first generation?

*September 30, 2012*

**Math. i need help!**

Assume that each female rabbit of a colony gives birth to three female rabbits. How many female rabbits of the tenth generation will be descendants of a singal rabbit of the first generation?

*September 30, 2012*

**physics **

The three vectors in the figure below have magnitudes a = 2.45 m, b = 3.15 m, and c = 15.0 m and angle θ = 36.5° find x component of vector a

*September 30, 2012*

**Math**

Assume that each female rabbit of a colony gives birth to three female rabbits. How many female rabbits of the tenth generation will be descendants of a singal rabbit of the first generation?

*September 30, 2012*

**Chemistry**

Suppose the atmospheric pressure during the experiment was 751 mmHg. The temperature of the water was found to be 23.0 degrees celsius. What is the pressure of the oxygen gas, Po2 that is produced?

*September 27, 2012*

**Math**

round each number to the place of the underlined digit 165,023,912 the one is underline?

*September 17, 2012*

**Chemistry**

An automobile gasoline tank holds 20.0 gal when full. How many pounds of gasoline will it hold if the gasoline has a density of 0.560 g/mL?

*September 10, 2012*

**Ss**

In the late 1800s mant industrialists set up welfare institutions and organizations.to help the urban poor?

*August 3, 2012*

**Finance Management**

CASE STUDY 1 please read the continuing case at the end of Chapters 1 and 2 in your textbook. After studying the Chapter 1 case, respond to the following: 1.At which level do some of the basic functions (cost accounting, reporting tax, patient accounts and billing, accounts ...

*July 16, 2012*

**intro chem**

What is the mass of carbon dioxide produced if 1.95 g sodium carbonate is used?

*July 15, 2012*

**social studies/ history**

thank you

*May 19, 2012*

**social studies/ history**

Oh!!!! Ms.Sue, the question said "Explain the Iroquoise pollitical system".

*May 19, 2012*

**social studies/ history**

OK THANK YOU FOR ANSWERING QUESTION NUMBER 2 THOUGH

*May 19, 2012*

**social studies/ history**

the homework never said wether it was kinship.All it said was iroquois system.

*May 19, 2012*

**social studies/ history**

1) Explain the Iroquois system. 2) How did the Europeans change the ways of life of the Plains Indians. Help! And no links please since I am in a rush, I have to pick someone up.

*May 19, 2012*

**Calculus Max/Min Prob**

At 7:00 am, one ship was 60 miles due east from a second ship.If the first ship sailed west at 20 mph, and the second ship sailed southeast at 30 mph, at what time are they closest together?

*May 10, 2012*

**government**

Can someone help please

*May 7, 2012*

**chemistry**

write and equation for the reaction of triethylamine and water. does the eqilibrium go to the right or left. so far what I have is C6H15N + H2O but I'm not sure of the products

*April 12, 2012*

**chem**

why is the solubility of benzoic acid dependent on pH?

*April 12, 2012*

**Math**

A contractor gives a quote of $21,060 to build an 18 foot by 24 foot barn. What is the building cost per square foot?

*April 8, 2012*

**chemistry**

For the theoretical yield, I used the mass of acetic anhydride. Was I supposed to use the mass of salicylic acid (which was 2.00 g) instead? acetic anhydride + salicylic acid ---> acetic acid +acetylsalicylic acid

*April 4, 2012*

**chemistry**

I have to find the theoretical yield of acetylsalicylic acid in the exeriment? I used 5.0 mL acetic anhydride which is about 5.40 grams. When I calculated the theoretical yield, I got 9.53 grams. Is this number correct?

*April 4, 2012*

**Accounting**

Identify each statement as true or false. If false, indicate how to correct the statement. 1. Depreciation is a process of asset valuation, not cost allocation. 2. Depreciation provides for the proper matching of expenses with revenues. 3. The book value of a plant asset ...

*April 2, 2012*

**Calculus**

derivative of y=ln2^x please help, I am getting the wrong answer every time

*March 29, 2012*

**Math**

I have solved the following and I am writing just their answers with it, please let me know if these are correct. thanks 1. Simplify, and write in the base of 3: (9^x . 3^4x)^2 answer: 3^12x 2. Differentiate and simplify y= (e^x - 1) / x^2 answer: (xe^x - 2e^x +2) / x^3

*March 25, 2012*

**Chemistry(Please help)**

just copy and paste your question into google and the exact same question pops up on the first link. the post you posted before is the 3rd link down.

*March 14, 2012*