Friday

December 19, 2014

December 19, 2014

Total # Posts: 1,154

**chemistry**

What is the solubility of calcium fluoride in a buffer solution containing 0.45 M formic acid and 0.20 M sodium formate? Given: Ka for formic acid = 1.7 x 10-4 Ka for hydrofluoric acid = 6.8 x 10-4 Ksp for calcium fluoride = 3.4 x 10-11
*December 3, 2014*

**chemistry**

A voltaic cell is constructed with all the reactants and products in their standard states. Will this condition hold as the cell operates? Explain.
*December 3, 2014*

**Precalc**

Two lookout towers are situated on mountain tops A and B, 4 mi from each other. A helicopter firefighting team is located in a valley at point C, 3 mi from A and 2 mi from B. Using the line between A and B as a reference, a lookout spots a fire at an angle of α = 38° ...
*November 21, 2014*

**math**

Mandy is enlarging a photo that is 3 in. wide and 4.5 in long. if she wants the width of the enlargement to be 10 in, what will be the length??
*November 21, 2014*

**Economics help**

Why important is it to consider exchange rates when planning to travel to another country
*November 18, 2014*

**Derivatives**

If g(x) = tan (5x2), then g ′(x) = ? I've worked this problem out like four times already and I keep getting a complete different answer..So I think I'm doing it wrong. I keep getting these.. g'(x)= cosx^2 5tan g'(x)= 2cosxtan^2
*November 17, 2014*

**Calculus Can you help**

yay!
*November 17, 2014*

**Calculus Can you help**

Suppose the functions f and g and their derivatives have the following values at x = 1 and x = 2. Let h(x) = f(g(x)). Evaluate h′(1). X | f(x) G(x) f'(x) g'(x) ____________________________ 1 | 8 2 1/3 -3 2 | 3 -4 2π 5 My answer: -6π but I'm not ...
*November 17, 2014*

**Math help/check**

Suppose the functions f and g and their derivatives have the following values at x = 1 and x = 2. Let h(x) = f(g(x)). Evaluate h′(1). X | f(x) G(x) f'(x) g'(x) ____________________________ 1 | 8 2 1/3 -3 2 | 3 -4 2π 5 My answer: -6π
*November 16, 2014*

**Pre-Cal**

If g(x) = tan (5x2), then g ′(x) = ? I've worked this problem out like four times already and I keep getting a complete different answer..So I think I'm doing it wrong. These are the answers I have gotten while doing this problem. g'(x)= cosx^2 5tan g'(x...
*November 16, 2014*

**geometry**

What's a sample space???
*November 8, 2014*

**geometry**

Eddie is arguing with tana about the probability of flipping three coins. They decided to flip a penny, nickel, and a dime. Which would be better determining the sample space, a tree diagram or an area model? Justify your answer.
*November 8, 2014*

**geometry**

Use Pythaorean Theorem a^2+b^2=c^2
*November 4, 2014*

**chemistry**

How many molecules are in 105 g of sugar (C12H22O11)? Answer in units of molec
*October 31, 2014*

**chemistry**

How many hydrogen atoms are in 833 grams of water? Answer in units of atoms
*October 30, 2014*

**Math**

x= -4, 9
*October 29, 2014*

**AP Giannini**

Dexter makes a scale drawing of his room. In real life, the room is 10' wide and 12'6" long. In Dexter's drawing, the room is 4"wide, what measure should the length be? explain how you figure this out.
*October 15, 2014*

**chemistry**

how could solid magnesium phosphate be prepared and collected using hydrochloric acid, sodium phosphate solution, water and magnesium? For the answer, write a series of steps that describe the procedure and includes a balanced chemical equation for each step
*October 14, 2014*

**3rd garde math**

what is 12 x 12? im having a hard time can anyone help me??????????
*October 1, 2014*

**Trigonometry**

A volleyball player spikes the ball from a height of 2.44 meters. Assume that the path of the ball is a straight line. To the nearest degree, what is the maximum angle, θ, at which the ball can be hit and land within the court?
*September 30, 2014*

**Physics**

A meter stick weighs 200 grams and is supported at the center. Three masses of 100, 200, and 150 grams are placed respectively, at the 10-cm, 20-cm and 60 cm points of the meter stick. To balance the meter stick, where must a 300 grams weight be placed on the meter stick?
*September 28, 2014*

**Social Studies**

I need a website that has answers to this worksheet: Russia and Eastern Europe: CHERNOBYL - April 26, 1986.
*September 23, 2014*

**physics**

A state trooper’s car sends out a radar signal at a frequency of 13.3 GHz. Find the wavelength of this signal. The wave speed is 2.998 × 108 m/s. Answer in units of m
*September 18, 2014*

**music**

How much music is in your head?
*September 18, 2014*

** math**

Which of the following situations describe quantities that combine to make 0? During the top of the fourth inning of a baseball game, the Ravens scored three runs. During the bottom of the fourth inning, the Raiders scored five runs to tie the game. Jacoby went on a hiking ...
*September 18, 2014*

**math**

a plane flew for 4hrs, 30 miles per hour and an adverge speed of 515 mph how far did it fly?
*September 17, 2014*

**AP CALC. AB **

1.Locate the discontinuity of the function y=1/(1+sin x) 2.Suppose that f is a continuous function defined for all real numbers x and f(-5)=3 and f(-1)=-2 . If f(x) = 0 for one and only one value of x, then which of the following could be x?
*September 14, 2014*

**AP CAlc. AB Please helppp!! **

f(x)=|x|+1 Let A(r) be the enclosed by the x axis, the line x=-2, the graph of the function f, and the line x=r for any r=>-2 A) Write A(r) as a piecewise function with its joints at r=0 Please walk me through each step i am really confused!!
*September 8, 2014*

**AP CAlc. AB**

Thank you so much Steve!!!
*September 6, 2014*

**AP CAlc. AB**

limit x->0 (3k+k(x^2) sin(1/x)), if k is a positive constant
*September 6, 2014*

**comprehension**

Thank you so much!!!!
*September 5, 2014*

**comprehension**

can you please explain to me how it is 8 days so i can learn?
*September 5, 2014*

**comprehension**

thank you
*September 5, 2014*

**comprehension**

the grasshopper fell into a hole that was 3 meters wide and 2 meters deep. the grasshopper himself was only 5 centimeters long. over the course of a day he managed to climb 1/4 of a meter. if he continues at this rate how long will it take him to climb out the hole? A- 8 days ...
*September 5, 2014*

**English**

I'm writing a fable but I'm stuck for ideas. I like the morals don't judge a book by its cover and man is what he believes. I cant think of anything else but the story has to have animals as the characters. I can't get help from my teacher as we got this ...
*September 5, 2014*

**math**

how is the process used to multiply a fraction an a whole number similar to the process used to multiply two whole numbers?
*September 1, 2014*

**Algebra**

5.) A boat makes a trip downstream in 5 hours. The return trip against the current takes 12 hours. If the speed of the current is 3 1/2 km/h, what is the speed of the boat in still water? 6.) How far does the boat referred to in Exercise 5 travel (one-way)?
*August 31, 2014*

**p.e**

I do not go to connection academy. I go to arvada middle school and this is homework I need help on.
*August 26, 2014*

**p.e**

All aspects of health are equally important. A problem in one area can affect other areas. A. true B. False Is the answer false?
*August 26, 2014*

**p.e**

I wouldn't think it would be becauseyou can't control your friends so would it be d
*August 26, 2014*

**p.e**

You decide you are going to make more responsible health decisions. Which of the following risk factors can you control? A. there is a history of heart disease in your family. B. there is a higher incidence of high blood pressure in your ethnic group. C. your friends have ...
*August 26, 2014*

**p.e**

I thought that the answer was D because of the illness but my mom said I was wrong.Is the answer D?
*August 26, 2014*

**p.e**

Which of the following habits will most likely move you towards the illness end of the health continuum? A. maintaining supportive relationships with family and friends B. getting enough rest C. Dieting D. isolating yourself from others Is the answer a?
*August 26, 2014*

**English**

What's the relative clause in this sentence His questions revealed an intelligence that was beyond his young years
*August 19, 2014*

**Math**

the answer is c.)42
*August 13, 2014*

**Accelerated Algebra **

it takes 80 feet of fencing to enclose your garden. According to your calculations,you will need 350 square feet to plant everything you want. Is your garden big enough? Explain your answer. They gave a rectangle length=40-x and width= x I asked my mom and she also got ...
*August 10, 2014*

**physics**

An object carries a charge of -6.9 µC, while another carries a charge of -2.0 µC. How many electrons must be transferred from the first to the second object so that both objects have the same charge?
*July 28, 2014*

**physics**

Two spherical objects are separated by a distance of 1.53 × 10-3 m. The objects are initially electrically neutral and are very small compared to the distance between them. Each object acquires the same negative charge due to the addition of electrons. As a result, each ...
*July 28, 2014*

**physics**

A proton moves parallel to an electric field between points A and B. The change in the proton's electric potential energy is EPEB – EPEA. If the proton is removed from point B and replaced with an electron, how does the change in electric potential energy of the ...
*July 28, 2014*

**Physics**

Two objects separated by a distance r are each carrying a charge –q. The magnitude of the force exerted on the second object by the first is F. If the first object is removed and replaced with an identical object that carries a charge +4q, what is the magnitude of the ...
*July 28, 2014*

**Help english**

I need help with English comprehension.
*July 17, 2014*

**math**

find the straight line that passes through point (2,4) and is perpendicular to line 2x + 12y - 6 = 0
*July 5, 2014*

**computer system organization**

2. You're an IT professional, and your boss has asked you to prepare a briefing for senior staff on the comparative advantages and disadvantages of three competing tape drive technologies: Digital Linear Tape (DTL), Advanced Intelligent Tape (AIT), and Linear Tape Open (...
*July 1, 2014*

**Chemistry**

A solution of X2CO3 has a concentration of 15.2 g/dm^3. 25 cm^3 of this solution require 27.5 cm^3 of 0.2 M HCl for complete reaction. Calculate the ralative atomic mass of X
*June 28, 2014*

**math**

A cylinder is 12cm tall and has a diameter of 3 cm. What is the surface area?
*June 8, 2014*

**math**

A polyhedron has 6 faces and 4 vertices. Use Euler's formula to calculate the number of edges.
*June 8, 2014*

**Algebra**

Using a standard 52-card deck, whats the probability of being dealt a pair of aces in a 5-card hand?
*May 28, 2014*

**English**

Connect the first act of Love's Labor's Lost to a current event
*May 15, 2014*

**Chem**

Calculate the absolute error in a mole ratio. Determine mole ratio of Zinc iodide. error in mass (g) was +- 0.005 Mass of reacted Zn = 0.16 Mass of iodine = 1.134 experiment value= 1:1.95 calculate absolute error in 1.95?
*May 15, 2014*

**Physics**

A car's engine is only 12% efficient at converting chemical energy in gasoline into mechanical energy. If it takes 1.8 x 104 N of force to keep the car moving at a constant speed of 21 m/s, how much chemical energy would be needed to move the car a distance of 450 m at ...
*May 4, 2014*

**Algebra**

How would you simplify b^4=25/4
*April 22, 2014*

**Science**

when the interior of a car absorbs sunlight and warms up.
*April 15, 2014*

**MATH**

In triangle PQR, <P=90 degrees, <Q=10.5 degrees and RQ=120 cm. Find PR.
*April 15, 2014*

**Math**

In triangle PQR, <R=90 degrees, <Q=10 degrees and RQ=16 cm. Find PR.
*April 15, 2014*

**Chemistry**

The equilibrium constant Kc^i is 3.2x10^-34 at 25 degrees C for 2HCl(g) -> H2(g) + Cl2 (g). The equilibrium constant Kc^ii is .10 at 25 degrees C for 2ICl (g) -> Cl2 (g) + I2 (g). a) Calculate the equilibrium constant Kc for the reaction below at 25 C Cl2(g) + I2 (g) -&...
*March 13, 2014*

**Math**

Put the quadratics below into vertex form by completing the square. state the vertex. y=2x^2 - 4x-6
*March 8, 2014*

**Math**

Put the quadratics below into vertex form by completing the square. state the vertex. a) y=x^2 - 4x-21
*March 8, 2014*

**Chemistry**

Is the reaction between sodium sulfate and strontium nitrate endothermic or exothermic and why?
*March 5, 2014*

**Math **

A rocket follows a parabolic trajectory. After t seconds, the vertical height above the ground, in metres, is given by H=37t - t (squared). What is the maximum height of the rocket after 10 seconds? What is the max height of the rocket? What time does it reach the maximum ...
*March 5, 2014*

**physics**

What is the momentum of a 4 Mg semi truck going 30 m/s south?
*March 5, 2014*

**Language**

Thank You Writeacher
*March 4, 2014*

**Language**

What's the easiest way to tell the difference between participles and gerund? Besides that one is a adjective and the other one is a noun and the type of questions they ask.
*March 4, 2014*

**Math**

Please can you tell me how to find the percentage and probability
*February 28, 2014*

**physics**

Explain why should torques, not forces, play essential roles in the following actions. (a) open or close a door (b) tighten or loosen a screw using a wrench c) "Give me a place to stand, and I shall move the Earth with it"
*February 24, 2014*

**math**

Please can you tell me which method should I use to solve probability because I don't understand how to solve probability for grade 6
*February 24, 2014*

**math**

Tara has driven 70 miles of a 154 mile trip. If she averages between 50 and 57 miles per hour, which of the following is a reasonable amount of time it will take her to complete the trip?
*February 24, 2014*

**Math**

How can you solve this inequality using an algebraic method. -x^3+2x^2+4x-8 > or equal to 0 (x-2)(-x+2)(x+2) > or equal to 0
*February 22, 2014*

**Pre calc**

8sinxcosx=1 I don't know where to go after 2sinxcosx=1/4
*February 5, 2014*

**Chemistry**

In a similar experiment, a student needs a 0.50 M KOH solution (MM = 56.11 g/mol). The student only has a 50.00 mL volumetric flask. How much KOH should be added before the flask is filled with water?
*February 2, 2014*

**world history**

Oops sorry, but it's an abbreviation for: political, economic, religious, military, social power
*February 2, 2014*

**world history**

I need to find out if Obama mentions any PERMS power in this section of the State of Union 2014 Speech. I'm stuck and it doesn't seem like he mentions any political power, military power, etc. --------------------------------------- As Prepared for Delivery – Mr. ...
*February 2, 2014*

**Consumer Math**

is there any tutorial i can watch to get this question right?
*January 31, 2014*

**Chemistry**

Where can I find some chemical equations about land pollution? Please give me the website link.
*January 28, 2014*

**Chemistry**

Can you list some chemical equations about water pollution? At least 5.
*January 28, 2014*

**ela**

I'm doing an essay on how author's language expresses change in character. First, I need to know how David changed from a particular event in the story David's Haircut by Ken Elkes. I want to say that David changed from the haircut or that David changed from the ...
*January 27, 2014*

**math**

A teacher has a 10m roll of ribbon 3 cm wide . She cuts off 7 equal lengths 3 cm wide to make team bands for PE . There is 90 cm of ribbon left . How long is each team bands
*January 26, 2014*

**Fractions**

how do I solve for X? can you show me how?
*January 26, 2014*

**Fractions**

Sam has 9 yellow pencils in his desk. 3/4 of his pencils are yellow. How many pencils does Sam have in his desk? 3rd grade fraction, slightly confusing to me
*January 26, 2014*

**Math**

Thank you both! :)
*January 22, 2014*

**Math**

Would it be 60%????
*January 22, 2014*

**Math**

Express 3/5 as a percent.
*January 22, 2014*

**social studies**

I need to answer the questions on my study guide, it is my homework but I forgot my book,I need to read chapter 3 it's about our earth,s renewable and non renewable resources.where else I find out about it
*January 21, 2014*

**physics**

A mountain biker rides a given distance due north, then drives twice that far to the west. At the end of the trip the direct distance from the starting point is 112meters. What is the length of each leg of the trip and in which direction is the end point?
*January 12, 2014*

**Earth science**

In a few sentences, explain how information from paleoglaciation and paleomagnetism support the idea that continental plates have moved over the past several million years.
*January 10, 2014*

**earth**

Suppose a geologist is studying two distinct areas next to a spreading ridge. The magnetic direction of the minerals in the oldest area is opposite to the magnetic direction of minerals in the newest area. (a) Which area is closest to the centre of the ridge, the older or ...
*January 9, 2014*

**Math**

Cause if f(x)=3x-1 F(5) would be 3(5)-1 Which is 14 But someone told me the answer was 16
*December 26, 2013*

**Math**

Would the answer be 16?
*December 26, 2013*

**Math**

Let f(x) be a linear function with f(1) = 2 and f(3) = 8. Find f(5) How do u solve it like the steps
*December 26, 2013*

**Math**

So the equation is -3(x+1/2)? Like there's no Y= in it?
*December 26, 2013*

**Math**

Find the equation of the perpendicular bisector of the line segment joining the points (1, 2) and (-2, 1) Does it mean I have to find the line. Then find a line that cuts that line in to half because perpendicular bisector
*December 26, 2013*

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