Sunday

February 14, 2016
Total # Posts: 3,152

**Chemistry**

8. Imagine you have two containers of gas, one labeled gas A and one labeled gas B. Gas A has an average speed of 700 m/s and gas B has an average speed of 1100 m/s. Both containers are being held at the same temperature. How could you match the average speeds of gas A and gas...
*August 15, 2013*

**chemistry**

4. A container of gas has a volume of 3.5 L and a pressure of 0.8 atm. Assuming the temperature remains constant, what volume of gas would result if the pressure was 0.5 atm? A. 1.8 L B. 5.6 L C. 0.2 L D. 2.2 L My guess is B but I just want to double check
*August 15, 2013*

**Chemistry**

1. What is the mass of the 3.7 mol PbO2? A. 884 g PbO2 B. 65 g PbO2 C. 0.15 g PbO2 D. 825 g PbO2 I honestly have no guess for this one. Can anyone tell me how to do it?
*August 15, 2013*

**Algebra**

Twenty ounces of water are removed from a container and 3/4 of the original remains. How much water did the container have originally?
*August 13, 2013*

**Math**

Hi, I need some help with this question. Could anyone help? Tammy has 15 coins that total $1. What coins does she have and how many of each? Is there more than one answer? Find all the possibilities. Thanks, Hannah
*August 12, 2013*

**Math**

If I add all the numbers from 1-100 what do I get? This question has been confusing me for a while...
*August 10, 2013*

**Chemistry**

7. Which of the following is true? A. Cesium is the most active group 1 metal, because its valence electron is held more tightly than the others in the same group. B. Group 1 elements are more reactive than the group 2 elements because they have more valence electrons to lose...
*August 7, 2013*

**Chemistry**

15. When chromium loses two electrons, its configuration changes to A. [Ar]4s1. B. [Ar]3d4. C. [Ar]4s13d5. D. [Ar]4s13d4. I'm guessing it's B but I just want to double check
*August 7, 2013*

**Math**

Hi! I need some help with a problem in the packet I have to complete over the summer. Can anyone help? at uncle joe's farm there are chickens and sheep. tommy counted the heads and got a total of 12 heads. then he counted feet and got a total of 38. can you figure out how ...
*August 2, 2013*

**physics **

a 2.00 kg rock is dropped from a bridge to the water 50.0m below. what is the velocity as it hits the water? what is its kinetic energy as it hits the water?
*August 1, 2013*

**Analytical chem**

SPECTROPHOTOMETRIC ANALYSIS OF STEEL I have a known molarity of KMnO4 solution. It was diluted by a factor of 20. Its absorbance is now 1.18. The length of the path is 1 cm.What is the molarity of the new solution.
*July 23, 2013*

**chemistry**

Atoms of the group 15 elements tend to react to form _______ ions. A. 5+ B. 32 C. 52 D. 3+ My guess is D. Which is correct?
*July 17, 2013*

**Economics**

Anybody know the answer??
*July 9, 2013*

**Trigonometry**

Solve the triangle using the law of cosine: a= 5 b= 6 y= 35
*July 8, 2013*

**Trigonometry**

Could someone please help me out with this? I've read my text book, but can't seem to figure it out. And could you please show me how to do them? The Earth travels in a circular orbit around the Sun at 29.79 km/sec. If the radius of the orbit is 1.496 x 10^8 km, what ...
*June 4, 2013*

**science**

if a person puts 500 newtons into pushing an immovable wall that was 2 meters tall how many joules of work would they do
*May 30, 2013*

**social studies**

What are the responsibility's of the department of education
*May 28, 2013*

**social studies**

what is the responsibility's of education?
*May 28, 2013*

**social studies**

What is the responsibility's of the department of energy
*May 28, 2013*

**english**

One way we get to know characters is to want to avoid the most. Select TWO characters from Julius Caesar and write short essays on what you believe they fear the most and what evidence you used to come to this conclusion. any ideas
*May 28, 2013*

**geometry need asap**

A manufacturer made a container that looked like the Washington Monument to fill with raisins, as shown. Find the volume of the container the sides on the bottom are 2 inches for the base and the height is 7 inches
*May 28, 2013*

**geometry**

A manufacturer made a container that looked like the Washington Monument to fill with raisins, as shown. Find the volume of the container the sides on the bottom are 2 inches for the base and the height is 7 inches
*May 28, 2013*

**geometry **

I need to find the height and volume of a triangular prism. the front measures 8 cm and the side is 19 cm.
*May 28, 2013*

**geometry**

Find the surface area of the cone. in pie the radius is 3 cn the height is 18
*May 27, 2013*

**geometry **

I need to find the base, height, and volume of a triangu;ar prism. the front is 8 cm and the side bottom line is 19 cm
*May 27, 2013*

**geomerty**

please help
*May 27, 2013*

**geomerty**

A manufacturer made a container that looked like the Washington Monument to fill with raisins, as shown. Find the volume of the container the base is 2 in and 2 in the height is 5 in then the triagle is 2 in. There is a line between the h 5 and the 2
*May 27, 2013*

**geometry**

A manufacturer made a container that looked like the Washington Monument to fill with raisins, as shown. Find the volume of the container. The base has the front and sides as 2 and 2 inches the height is 5 in and the 2 inches.
*May 27, 2013*

**geo**

geometry
*May 27, 2013*

**geo**

help please
*May 27, 2013*

**geo**

I need to find the the height of the prism, the volume of the prism, and the area of the base. The front has a measurement of 8 cm and the line on the side has 19 cm. can you please help me.
*May 27, 2013*

**geo**

how do you find the base of a triangular prism >
*May 26, 2013*

**geometry**

these are the answer I have to pick from for volume 1088/3 pi feet cubed 960 pi feet cubed 320 pi feet cubed 1088 pi feet cubed
*May 26, 2013*

**geometry **

Find the area of the base and the volume of a cone. the height is 17 and the radius is 8. my answer needs to be in pie
*May 26, 2013*

**geometry **

I need to find the area of a base of a cylinder. The height is 9 and the radius is 3.
*May 26, 2013*

**geometry**

12 x 15 x 7 =450 would it be 2.8 galloons
*May 26, 2013*

**geometry**

12x 12 x15x15
*May 26, 2013*

**geometry **

The floor of a bedroom is 12 feet by 15 feet and the walls are 7 feet high. One gallon of paint covers 450 square feet. How many gallons of paint do you need to paint the walls of the bedroom?
*May 26, 2013*

**geomerty**

a= 2 x 3.14x 1 x 12 a = 75.36 a = 2 x 3.14x 8 x 3 a= 150.71 roller B
*May 26, 2013*

**geomerty**

Paint Roller A has a length of 12 in. and a diameter of 2 in. Paint Roller B has a length of 8 in. and a diameter of 3 in. Which roller can spread more paint on a wall in one revolution
*May 26, 2013*

**geomety**

128 feet
*May 26, 2013*

**geomety**

You want to pour a concrete slab with a width of 16 feet, a length of 16 feet, and a height of 0.5 feet. Find the volume of the concrete, so you know how much you will need
*May 26, 2013*

**geometry**

sa =4 x 3.14x 9^2 sa = 324 pie
*May 26, 2013*

**geometry **

Find the SURFACE AREA of a sphere that has a diameter of 18 centimeters. Leave your answer in terms of pi.
*May 26, 2013*

**Halfway solved-calc**

Oh, so that value is to be added. Okay, thank you!
*May 22, 2013*

**Halfway solved-calc**

Wow, thank you so much! But I'm wondering where the + 1 for the R and r, comes into play?
*May 22, 2013*

**Halfway solved-calc **

So I'm trying to solve this problem but one thing I don't get is, how do I know which method to use just by looking at the graph (disk, washer, or shell)? Find the volume of the solid generated by revolving the region bounded by the graphs y=x^2- 4x+ 5 and y= 5-x about...
*May 22, 2013*

**Math**

I absolutely understand this now. Thank you so much. I really couldn't have done it without your help Steve.
*May 22, 2013*

**Math**

No there wasn't. This is exactly the problem our substitute gave us, and I was having a hard time figuring out why that was so. Do they not intersect at (2, 0) as well? I was told this answer is incorrect as well (-1/4). I'm perplexed. :S
*May 22, 2013*

**Math**

3) Find the area bounded by the curves f(x)= x^3 + x^2 and g(x)= 2x^2 + 2x. I get 4653pi/105 after help from Mr. Reiny, but this is wrong. Have I calculated incorrectly? Thank you
*May 22, 2013*

**integral calculus**

I'm sorry about that. Can you explain why there is an error Mr. Pursley? I genuinely don't understand how there is an error.
*May 22, 2013*

**integral calculus**

let u=x^2 du= 2x dx dx=du/2x dx=du/2sqrt(u) -1/4 cos u is the integral
*May 22, 2013*

**Calculus**

3) Find the area bounded by the curves f(x)= x^3 + x^2 and g(x)= 2x^2 + 2x. I get 4653pi/105 after help from Mr. Reiny, but this is wrong. Have I calculated incorrectly? Thank you
*May 22, 2013*

**Calculus**

I did it and I get 4653pi/105 but this is wrong. Have I calculated incorrectly?
*May 21, 2013*

**Calculus**

Thank you very much Reiny. I understand it a bit better now.
*May 21, 2013*

**Calculus**

We're learning disks, shells, and cylinders in school but we have a substitute and I've been trying to teach this to myself. Can you check them please? =) Thank you! 1) Find the volume of the solid formed when the region bounded by curves y=x^3 + 1, x= 1, and y=0 is ...
*May 21, 2013*

**Calculus**

We're learning disks, shells, and cylinders in school but we have a substitute and I've been trying to teach this to myself. Can you check them please? =) Thank you! 1) Find the volume of the solid formed when the region bounded by curves y=x^3 + 1, x= 1, and y=0 is ...
*May 21, 2013*

**biology**

ap biology lab -what barriers might hinder the acquisition of plasmids
*May 17, 2013*

**bio**

I am doing the biology ap bacteria DNA transformation lab and I came up with a transformation efficiency of 150,000. I read somewhere that they should be between 2,000-8,000. is my answer way off? My group counted an average of 1529 colonies to begin with so i dont see how the...
*May 17, 2013*

**geometry **

AB= ft2 CB = ft l (slant height) = ft S = ft2 I need to find the answers this is a cone with a radius of 5 and a height of 13. Thank you
*May 16, 2013*

**math**

I need to find the A small b, C small b, slant height, and surface area of a cone. The height is 9.2 and radius is 5.6. Please help
*May 16, 2013*

**math**

The Transamerica Pyramid in San Francisco is shaped like a square pyramid. It has a slant height of 856.1 feet and each side of its base is 145 feet. Find the lateral area of the building.
*May 16, 2013*

**geometry**

please help
*May 15, 2013*

**geometry**

The Transamerica Pyramid in San Francisco is shaped like a square pyramid. It has a slant height of 856.1 feet and each side of its base is 145 feet. Find the lateral area of the building.
*May 15, 2013*

**geometry **

Find the surface area of a cone with diameter 27 m and slant height 19 m. Leave your answer in terms of pie
*May 15, 2013*

**math**

Find the surface area of a cone with diameter 27 m and slant height 19 m. Leave your answer in terms of . Note: You do not need to include in your answer
*May 15, 2013*

**math**

The Transamerica Pyramid in San Francisco is shaped like a square pyramid. It has a slant height of 856.1 feet and each side of its base is 145 feet
*May 15, 2013*

**gov**

what was the lower courts decision of the terry v.s ohio case?
*May 8, 2013*

**math**

7 inches is across the top of the can and 5 goes up and down.
*May 8, 2013*

**math**

can you pleae explain how to do this?
*May 8, 2013*

**math**

a cylinder can of coca has the dimensions of base 7in and height 5 inches. what is the approximate surface area available for the label?
*May 8, 2013*

**math**

197.8
*May 8, 2013*

**math**

I dont understand how to do this
*May 8, 2013*

**math **

A cylindrical carton of oatmeal with radius of 3.5 in. is 9 in tall. If all surfaces except the top are made of cardboard , how much cardboard is used to make the oatmael carton. Round your answer to the nearest square inch
*May 8, 2013*

**Math story problem**

A satellite dish is shaped like a paraboloid of revolution. the signals that emanate from a satellite strike the surface of the dish and are reflected to a single point, where the receiver is located. If the dish is 14ft across at its opening and 4ft deep at its center, at ...
*May 7, 2013*

**Math!**

Solve the equation on the interval 0<theta<2pi -tan(2theta)+2sin(theta)=0
*May 7, 2013*

**Trig**

cos[(tan^-1(3/4))+(cos^-1(9/41))]
*May 6, 2013*

**math**

I am supposed to find the area of a segment of a circle. The circle is cut with two radi with an angle of 90 degrees. Then where the radi touch the circle another line is drawn to connect them. The triangle and the small section between the triangle and the edge of the circle ...
*May 5, 2013*

**geometry**

possible answers are a 9 pi / 4 - 9 units squared b 6 pi / 4 - 4.5 units squared c 9 pi / 4 units squared d 9 pi /4 - 4.5 units squared
*May 4, 2013*

**geometry **

Find the area of the segment of the circle. Leave your answer in terms of pi. there is a circle with a 90 degree triangle and one side is 3 cm
*May 4, 2013*

**geometry**

You and your friend ordered a 12 cut pizza with a radius of 8 inches. How much cheese is needed to cover one slice of the pizza? Hint: Find the area of one slice. Round your answer to the nearest tenth
*May 4, 2013*

**math**

If a ramp has a slope of 1/8, and I need to put a support post 11 feet from the low point on the ramp, how long should the post be?
*April 29, 2013*

**Calculus**

Nevermind you can ignore this, I figured it out. I was just forgetting to do e^answer at the end.
*April 25, 2013*

**Calculus**

Find the limit as x approaches infinity of (lnx)^(1/x). This unit is on L'Hopital's rule. I know that the answer is 1, I just don't know how to get there. I tried taking the ln of everything so that you have ln(the whole limit) = limx-->infinity (1/x)ln(lnx) but...
*April 25, 2013*

**physics**

In a series circuit, the voltage across the resistor has an amplitude of 10 V. Across the inductor it is 25 V and across the capacitor it is 9 V. To the nearest tenth, what is the amplitude of the voltage across the whole group?
*April 22, 2013*

**Economics**

Would leisure time considered an inferior good when the substitution effect dominates? I think that the answer is yes because if you are willing to work more hours in order to make more money than you do not value leisure time that much. Is this correct? Thank you
*April 22, 2013*

**Microeconomics**

Is leisure time considered an inferior good when the substitution effect dominates? I think that the answer is yes because if you are willing to work more hours in order to make more money than you do not value leisure time that much. Is this correct? Thank you!
*April 21, 2013*

**Algebra**

Find the specified value of the following functions and state the domain of each one. f(x)=x-11;g(x)=7x^2 (a) (f+g)(5)=
*April 19, 2013*

**Economics(Please check, thank you)**

Is leisure time considered an inferior good when the substitution effect dominates? I think that the answer is yes because if you are willing to work more hours in order to make more money than you do not value leisure time that much. Is this correct? Thank you!
*April 19, 2013*

**Data Management**

How many 4 digit number can be made using 0 -7 with no repeated digits allowed?
*April 16, 2013*

**Data Management**

A bag contains three green Christmas ornaments and four gold ornaments. If you randomly pick two ornaments from the bag, at the same time, what is the probability that both ornaments will be gold?
*April 16, 2013*

**Data Management**

How many ways can the manager of a baseball team put together a batting order of his nine players, if the shortstop must bat 3rd?
*April 16, 2013*

**physics **

Suppose the Sun is 1.52669 × 108 km from Earth. The speed of light is 2.99792 × 108 m/s. How long does it take for its light to reach us? Answer in units of min
*April 8, 2013*

**chem**

A certain constant-pressure reaction is nonspontaneous at 37°C. The entropy change for the reaction is 83 J/K. What can you conclude about the sign of ÄH? What can you conclude about the magnitude of ÄH?
*April 6, 2013*

**chem**

Express the second law of thermodynamics as a mathematical equation. (Select all that apply.) For a reversible process, ÄSuniverse = 0. For a spontaneous process, ÄSuniverse > 0. For a spontaneous process, ÄSuniverse = 0. For a reversible process, Ä...
*April 3, 2013*

**chem**

the volume of 0.220 mol of an ideal gas at 34°C is increased isothermally from an initial volume of 12.0 L. If the final volume is 21.5 L, calculate the entropy change for the process.
*April 2, 2013*

**Math**

Which is the best estimate of -15/16 divided (-1/2)?
*April 1, 2013*

**biology**

how do chromosomes move inside a cell during each stage of cell division?
*March 31, 2013*

**chem**

Which of the following could be added to a solution of sodium acetate to produce a buffer? ? A) acetic acid only B) acetic acid or hydrochloric acid C) potassium acetate only D) sodium chloride or potassium acetate E) hydrochloric acid only i knowt he answer is b but i dont ...
*March 31, 2013*

**chem**

how do i do the ^4 when there is an x and it is a bionomial. i am having trouble
*March 28, 2013*