Saturday

July 4, 2015

July 4, 2015

Total # Posts: 990

**geometry**

Give an example of an infinite set.
*April 9, 2012*

**physics**

Elena, for some reason I'm getting an answer of -3 (8.00 x 10^-12) x (d-x)^2 = (6.00 x 10^-12) x (x^2) (d-x)^2/x^2 = 7.5 x 10^-1 (d-x)(d-x)/x^2 = 7.50 x 10^-1 x^2-x+0.25/x^2= 7.50 x 10^-1 then I get x = -3 Can you help! I'm not sure where i am going wrong.
*April 5, 2012*

**physics**

Two spheres with charges of 4.00nC and 3.00nC are placed 0.500m apart. At what point between the two charges must the third charge of 2.00cN be placed so that the net electrostatic force acting on this charge is zero?
*April 5, 2012*

**Precalc**

Evaluate Tan[(3pi-70000pi)/2]
*March 28, 2012*

**BioChem**

Write the chemical equation for the reaction that occurs when you add NaOH solution to NaH2PO4/Na2HPO4 buffer solution
*March 23, 2012*

**chemistry**

Hydorgen peroxide may be prepared by the following reactions: 2NH4HSO4 ---> H2+(NH4)2S2O8 (NH4)2S2O8+2H2O ----> 2NH4HSo4+H2O2 What mass of ammonium hydrogen sulfate, Nh4HSo4 is initially required to prepare 2.00 mole of H2O2? What mass of H2O is required? I have checked ...
*March 22, 2012*

**Chemistry**

What is the equilibrium equations that result when solid NH4F is dissolved in sufficient water to produce 5.0 mL of 0.5M NH4F solution? How would the addition of 5 drops of 0.1M HCl affect the equilibrium system. Give an explanation. How would the addition of 5 drops of NaOH ...
*March 20, 2012*

**math**

at camp, miriam learned how to use a pottery wheel. she can make 3 bowls in 2 hours. how long will it take her to make a set of 12 bowls?
*March 7, 2012*

**Math**

15/8-9/4=1 1/2
*March 6, 2012*

**Physics**

1.96 s
*March 4, 2012*

**understanding hospital billing and cosing**

Coding.
*March 3, 2012*

**Algebra 2**

A bag contains five red marbles and three blue marbles. In how many different ways can two red marbles be drawn if the first marble is not returned to the bag before the second marble is drawn?
*February 28, 2012*

**Algebra 2**

In how many different ways can six people be seated in a six-passenger van?
*February 28, 2012*

**Algebra 2**

The nurseryman brought six different varieties of trees to plant in six locations in the park. In how many different ways can he plant the trees?
*February 28, 2012*

**Algebra 2**

The artist, R. Locklen Jones, selects three paintings from a collection of six to display in a row. How many different arrangements of the display are possible?
*February 28, 2012*

**Algebra 2**

The red spinner has six equal sectors labeled with numbers 1 through 6. The blue spinner has four equal sectors labeled with letters A, B, C, and D. Find the probability of spinning the two spinners and getting a 5 with a B?
*February 28, 2012*

**Algebra 2**

A box contains 4 blue golf tees, 2 red ones, 1 yellow tee, and 3 white ones. Two tees are randomly drawn from the box. Find the probability of choosing a blue tee followed by a red one, if the first tee chosen is returned to the box before choosing the second tee?
*February 28, 2012*

**Algebra 2**

Two cards are randomly drawn from a standard deck without replacing the card after the first draw. Find the probability of drawing a spade followed by a heart?
*February 28, 2012*

**Algebra 2**

The numbers 1 through 9 are written on slips of paper and placed into a hat. Two slips are randomly drawn. If the first slip of paper is not returned to the hat after it is drawn, find the probability of getting a six and then a three?
*February 28, 2012*

**math**

what does z equal in the equation 3z minus z equals 24
*February 25, 2012*

**Physics 2**

A wire has a length of 4.52 x 10-2 m and is used to make a circular coil of one turn. There is a current of 7.94 A in the wire. In the presence of a 8.04-T magnetic field, what is the maximum torque that this coil can experience?
*February 25, 2012*

**Physics 2**

A wire has a length of 4.52 x 10-2 m and is used to make a circular coil of one turn. There is a current of 7.94 A in the wire. In the presence of a 8.04-T magnetic field, what is the maximum torque that this coil can experience?
*February 25, 2012*

**Geometry Are these two triangles similar? Thanks!**

Thank you :]
*February 20, 2012*

**Geometry Are these two triangles similar? Thanks!**

Are these two triangles similar? How do you know? There are two triangles HMG and JMK They are connected at the top point at M H is on the bottom left, G is on the bottom right, and M is at the top for triangle HMG For triangle JMK J is on the bottom right and K is on the ...
*February 20, 2012*

**6th grade Social studies**

What was the main effect of the repeated exiles of the Jews?
*February 18, 2012*

**Math **

Find two numbers on the 30-board(the factor game) with the greatest product.
*February 16, 2012*

**Chemistry**

Determine the grams of hexane that will react exactly with 22 g of oxygen. Show all working please. Thank you.
*February 12, 2012*

**Chemistry**

Calculate the moles of hexane required to form 150 g of carbon dioxide. Please show all working. Thank you.
*February 12, 2012*

**Africa**

Why did Greg mortenson start pennies for peace
*February 9, 2012*

**literature.......**

Yes i like it. Its really good. Im supposed to make a realistic fiction story too and i want to do it by myself with a little help. i love writing but not this genre i like making stuff up! Good luck. :)
*February 5, 2012*

**Geometry**

Find the area of a rhombus with a 45 degree angle and sides of 12m long?
*February 1, 2012*

**math**

what three consecutive months would have the least number of days
*January 31, 2012*

**consumer math**

did you ever figure this out? what was the answer?
*January 30, 2012*

**Alegbra**

Six angles in a hexagon are fit together.It looks like this... _____ /\ / \ /_1\6/_5\ \ 2/3\4/ \/____/ I try to draw the picture as best as I can but try to imagine. It's a hexagon with the six angles labeled near the center of the hexagon. The options given to this ...
*January 30, 2012*

**math**

A statue is made of a mixture of copper and zinc in a ratio of 11:4 (copper to zinc). If the weight of the statue is 3165 pounds, what is the weight of the copper?
*January 29, 2012*

**math**

The perimeter of the triangle is 40 inches. If you wanted to construct a similar triangle with a perimeter of 50 inches, what would be the length of the shortest side of the triangle?
*January 29, 2012*

**Math**

• 1 mile=5280 feet • 1 foot=12 inches • 5280 X 12 = 63,360 inches in 1 mile • 400 x 63,360 = 25,344,000 inches in 400 miles (this is how many inches SLC and Reno are apart today. • 250 x 63,360 = 15,840,000 inches in 250 miles (this is how many inches ...
*January 27, 2012*

**algebra**

y=1/2x-1
*January 27, 2012*

**Physics**

In a cathode ray tube, electrons initially at rest are accelerated by a uniform electric field of magnitude 4.71 x 105 N/C during the first 5.49 cm of the tube's length; then they move at essentially constant velocity another 47.9 cm before hitting the screen. Find the ...
*January 25, 2012*

**chemistry**

Calculate the number of moles in 35.7 grams of Na3PO3
*January 21, 2012*

**Calculus**

What exactly is an integral? I understand it is the area under a curve but what does it pertain to?
*January 17, 2012*

**Math**

How do you find the exact value of: 4sin 60degrees - 3tan 135degrees
*January 10, 2012*

**geometry**

a company logo is a rhombus with4-cm sides and angles of 60 degrees and 120 degrees. find the angle measures and side lengths if the logo is changed as follows
*January 9, 2012*

**Alebra**

Kathy works at an optical store selling eyeglasses. Each week she earns $180 plus a 2% commission of her total sales for the week. Next week she wants to earn at least $350. 1. Write an inequality that represents the dollar amount of eyeglasses kathy must sell to earn at least...
*January 3, 2012*

**Physics**

A vessel contains 10 kg of water and an unknown mass of ice at 0°C. The temperature of the vessel is monitored for 60 minutes. During the first 50 minutes, the temperature remains at 0°C. For the next 10 minutes, the temp steadily increases from 0°C to 2°C. a. ...
*December 8, 2011*

**physics**

A track star goes in the long jump at 10 m/s at 37 degrees above the horizontal. What is the magnitude of the horizontal displacement?
*December 7, 2011*

**Physics**

How can one find the magnitude and the directions of a resultant if Vector A is 35N @ 60' NE, and Vector B is 50N @ 20' NW?
*December 4, 2011*

**Physics**

How can one find the magnitude and the directions of a resultant if Vector A is 35N @ 60' NE, and Vector B is 50N @ 20' NW?
*December 4, 2011*

**math**

18a^3 + 30a^2 / 3a
*December 1, 2011*

**math**

18a^3 + 30a^2 / 3a
*December 1, 2011*

**chemistry**

What mass of KNO3 in grams would be required to prepare 0.6 liters of a 1.8 M KNO3 solution?
*November 29, 2011*

**Calculus**

A storage tank used to hold sand is leaking. The sand forms a conical pile whose height is twice the radius of the base. The radius of the pile increases at the rate of 2 inches per minute. Find the rate of change of volume when the radius is 5 inches.
*November 23, 2011*

**geometry**

I'm so confused...can someone please help??? I need to find the orthocenter of the triangle with the vertices R(-4,8), S(-1,5), T(5,5)??? How do you get 'y' for this problem?
*November 21, 2011*

**world history**

I have the same question on my test,I have my book in front of me and yes, it is D.
*November 18, 2011*

**Chemisty**

Iodine monobromide and ammonia react to produce nitrogen triiodide and ammonium bromide. (a) Balance the chemical equation for this reaction. (Use the smallest possible whole numbers. Enter 1 where appropriate. Do not leave any answer box blank.) . IBr(s) + . NH3(g) . NI3(s...
*November 16, 2011*

**Science**

Thermite is a mixture of iron(III) oxide and aluminum powders that is used in some countries to weld railroad tracks. It is a spectacular reaction to yield solid aluminum oxide that floats on the molten iron. When cooled, the iron is ground smooth and even with the rest of the...
*November 16, 2011*

**Science**

Al(OH)3(s) + HCl(aq) AlCl3(aq) + H2O(l) How many moles of HCl are required to react with 0.470 g of Al(OH)3 in the above unbalanced reaction? Use at least as many significant figures in your molar masses as in the data given. mol HCl What mass of HCl is required? How many ...
*November 16, 2011*

**math**

5.3+4=3.24-2.7
*November 14, 2011*

**math**

5.3+4=3.24-2.7
*November 14, 2011*

**statistics**

A nationwide study indicated that 27% of adults said that chocolate was their favorite ice cream flavor. A simple random sample of 150 adults is obtained. A.) Describe the sampling distribtuion of p, the sample proportion of adults whose favorite ice cream flavor is chocolate...
*November 11, 2011*

**calculus**

Question 1 The figure below shows the rate of change of the quantity of water in a water tower, in liters per day, during the month of April. If the tower had liters of water in it on April 1, estimate the quantity of water in the tower on April . Round your answer to the ...
*November 10, 2011*

**Logic- Formal Proof**

I need to solve a proof and I cannot figure it out. The instructions say only that I will have to use subproofs within subproofs. Premises: A or B A or C Conclusion: A or (B and C)
*November 9, 2011*

**geometry**

what is the slope of the line determined by the equation 2x+y=5?
*November 8, 2011*

**fraction 10-1 math **

camp big trees has 3 red canoes and 4 blue canoes. what fraction of the conoes are red ?
*November 7, 2011*

**fraction 10-1 math **

camp big trees has 3 red canoes and 4 blue canoes. what fraction of the conoes are red ?
*November 7, 2011*

**Algebra**

Thank you so much!! It really helped me understand!
*November 4, 2011*

**Algebra**

Rationalize the denominator: 5 /4-squareroot 5 (five over four minus square root five) Please explain
*November 4, 2011*

**Algebra**

Thank you!
*November 4, 2011*

**Algebra**

Two hoses are connected to a swimming pool. Working together, they can fill the pool in 4 hr. The larger hose, working alone, can fill the pool in 6 hr less time than the smaller one. How long would it take the smaller one, woking alone, to fill the pool? Please explain
*November 4, 2011*

**english**

what is an appositive phrase?
*November 4, 2011*

**math**

write a matrix for x-y=8,-2x-5y-6z=-27, 9x+10y-z=54
*November 2, 2011*

**Culture Diversity**

I have a paper due soon where I need to interview three Japanese Americans. Could any Japanese American answer the following questions for me? I would greatly appreciate it! If you dont feel comfortable answering some of them just leave them blank, Thanks! What is your first ...
*November 2, 2011*

**physics**

Consider the window (of area 0.68 m2) of an airplane. If the pressure inside the plane is atmospheric pressure, while the pressure outside is 31 % of Patm, find the force on the window. Ignore the velocity of the airplane (i.e., ignore Bernoulli’s effect).
*October 28, 2011*

**Physics**

If the pressure outside a window drops by 9.1%, while the pressure inside does not change, what is the force on the window? Assume that the area of the window is 2.3 m2.
*October 28, 2011*

**Physics**

Correction h + (d^2)/4h
*October 17, 2011*

**Physics**

h + (d^2)/h
*October 17, 2011*

**ALGEBRA-Help please**

Find the solution to the following system of two linear equations, if it has a solution. x+3y=4, 3x+9y=12
*October 13, 2011*

**Math**

I dont think I follow....
*October 13, 2011*

**Math**

1) Find the solution to the following system of two linear equations, if it has a solution. 2x-y=3, -x+y=1 2Find the solution to the following system of two linear equations, if it has a solution. 2x+y=4, x+3/2y=3
*October 13, 2011*

**math**

When is an exact number needed and when is an estimate okay?
*October 10, 2011*

**World History**

Everybody is saying the answer is Traditional Brahman elites,but that is so wrong. I ahve my history book here in front of me, and it says the answer is The Buddhist clergy .
*October 10, 2011*

**physics**

A military gun is mounted on a railroad car (m = 1590 kg) as shown in Figure P7.34. There is no frictional force on the car, the track is horizontal, and the car is initially at rest. The gun then fires a shell of mass 26 kg with a velocity of 280 m/s at an angle of 28° ...
*October 2, 2011*

**physics**

How long does it take an automobile traveling 62.0 km/h to become even with a car that is traveling in another lane at 37.5 km/h if the cars' front bumpers are initially 138 m apart? in seconds
*September 29, 2011*

**Calculus**

Let A be the region bounded by the curves y = x^2-6x + 8 and y = 0. Find the volume obtained when A is revolved around the Y-AXIS
*September 26, 2011*

**Calculus**

Let A be the region bounded by the curves y = x^2-6x + 8 and y = 0. Find the volume obtained when A is revolved around the Y-AXIS
*September 26, 2011*

**Science**

Why does a toy car go faster and further when it is added weight onto it and is put on a ramp at 45 degrees?
*September 25, 2011*

**biology**

Lack of iron in the photic zone of the open ocean restricts the size of plankton populations. Iron is what kind of factor for marine plankton?
*September 22, 2011*

**Math word problem**

A carpenter wants to put four shelves on an 8-foot wall so that the five spaces created decrease by 6 inches as we move up the wall. If the thickness of each shelf is 3/4 inch, how far will the bottom shelf be from the floor?
*September 21, 2011*

**chemistry**

An unknown rectangular substance measures 3.6 cm high, 4.21 cm long, and 1.17 cm wide. If the mass is 21.3g, what is this substance’s density?
*September 16, 2011*

**Biochemistry**

What is the pH after 5 mL of 0.1M NaOH has been added to 25 mL of 0.2M acetic acid?
*September 8, 2011*

**math**

Brandon’s rentals charges $ 25 per hour to rent a Windsufer and a wet suit. Wendy’s charges $20 per hour plus $15 extra for a wet suit. Find the number of hours for which the total charges for both would be the same.
*September 8, 2011*

**science**

The radius of the Iron atom is 124 pm. How many of these will span a distance of 50.5 m..
*September 5, 2011*

**math**

a person can copy the final exam in 28 minutes using a new copy machine. using an old copy machine, it takes 70 minutes. if both machines are used, how long will it take to complete the job
*August 2, 2011*

**Physics-Need Help fast!**

Two converging lenses, each of focal length 15.1 cm, are placed 40.2 cm apart, and an object is placed 30.0 cm in front of the first lens. Where is the final image formed? The image is located... What is the magnification of the system? M =
*August 1, 2011*

**Physics-Need Help fast!**

Part 1 A 3m long pipe is in a room where the temperature is 20 degrees C. What is the frequency of the first harmonic if the pipe is closed at one end? Part 2 sound traveling in air at 23 degrees C enters a cold front where the air temp is 2 degrees C. If the sound frequency ...
*July 27, 2011*

**Math**

Find a polynomial of minimum degree with zeros -3, -2 and 1 (of multiplicity 2)
*July 16, 2011*

**Math**

Given the function f(x) = 7 - 6x, evaluate f(x+h)-f(x)/h
*July 16, 2011*

**Math Calculus**

Reiny, Before you do equals to zero, how did you get 0.04x^3 + 55x^2 - 1380 = 0? I set 0.04x + 55 - 1380/x^2 = 0 and I got x=-137.317, or x=-5.204,, or x=4.921 if i plus in to the originals i have to plus each x's? and the minimum average is the smallest number from the ...
*July 8, 2011*

**Math Calculus**

no i don't see any negative sign in my homework question... first I did C*bar(x)/x = 0.02x^3+55x^2+1380/(x) = 0.02x^2 + 55 x + 1380/x then I differentiate it C*bar*'(x) = 0.4x - 1380/x^2 +55 then I set it equal to zero which gives me x = -137.317 or x=-5.104 and 4.921 ...
*July 8, 2011*

**Math Calculus**

Let C(x) = 0.02x^3 + 55x^2 + 1380. Find the minimum average cost for this commodity. I got to the point where I got x=-1374.98, x=-5.018, x=5 but what do I have to do again after this? Because I am missing some steps after I find x. Do i have to plug all the X's to the ...
*July 8, 2011*