Wednesday

April 16, 2014

April 16, 2014

Total # Posts: 560

**alg II**

how do you solve this equation 2 cos pi x = 4x + 5

**math**

it is the cost of the item.

**math**

what is a 40% mark up on an item that costs-$38.00?

**Little River **

Jack and Jill invented a Trivia game in which a player can score 0,6 or 11 points on each turn.each player must take at least one turn.write an equation for a total score of 45 points in the game.

**chemistry**

A galvanic cell has an iron electrode in contact with 0.20 M FeSO4 and a copper electrode in contact with a CuSO4 solution. If the measured cell potential at 25 degrees Celcius is 0.61 V , what is the concentration of Cu2+ in the CuSO4 solution?

**physics ( help)**

First of all your initial vertical velocity is not 4.5 m/s. it is Viy= 4.5 * sin(30) and your horizontal = 4.5 * cos(30)

**Algebra**

sqrt(55) -sqrt(1/55)+sqrt(5/11)=?

**English**

Not sure that you need that dash in "already-significant" In the end, change "help" to "helping." Better yet, you could say "I'm looking forward to contributing to the success of your company."

**Algebra**

sqrt(55)-sqrt(1/55)+sqrt(5/11)=?

**Algebra**

I am racking my brain trying to figure out how to work this: the square root of 55 minus the square root of one over 55 plus the square root of 5 over 11. Do I use conjugates? Ahhhh!

**geo 2**

if ABCD is a square and DB is equal to 12 cm, then AC is equal to 6 cm.

**math**

simplify 9-(6+4v) & 7(p-10)-7

**econ**

A bumper crop of farm products causes: 1) only a slight decline in the price of farm products because the demand for farm products is income inelastic. 2) a large decline in the price of farm products because the demand for farm products is price inelastic. 3) only a slight de...

**math**

Find the set that describes the intersection of each pair of sets: a. C={people who are more than 20 years old}. D={people who are enrolled in college}. b. A={4,6,8}, B={2,4}. c. E={the odd whole numbers}, F={the even whole numbers greater than 40}.

**Chemistry**

I need to duplicate the strength of lye made from wood ash dissolved in water (Potassium Hydroxide) to that of lye made from Sodium Hydroxide disolved in water. The soap recipes I use require lye of various strengths as determined by fluid volume of water combined with the pre...

**Chem**

I need to duplicate the strength of lye made from wood ash dissolved in water (Potassium Hydroxide) to that of lye made from Sodium Hydroxide disolved in water. The soap recipes I use require lye of various strengths as determined by fluid volume of water combined with the pre...

**Chem**

I know how to make soap, using lye. I want to be able to make the lye solution from wood ash be the same ph as commercial lye. I think this can be done using the ph of sodium hydroxide in water as I first stated. Is it possible to compute this ph.

**Chem**

What is the PH range between 58 grams and 87 grams of Sodium Hydroxide in 6 oz by volume of water. What is the PH range of that amount of Sodium Hydroxide in 8 oz of water. I need this information to learn to make soap using wood ash.

**AP Physics**

The initial kinetic energy imparted to a 0.72 kg bullet is 1777 J.The acceleration of gravity is 9.81 m/s2. Neglecting air resistance, find the range of this projectile when it is fired at an angle such that the range equals the maximum height attained. Answer in units of km.

**Ma**

Autoparts Inc. produces three types of parts' assemblies: (P,Q,R)and they each require (2,5,3) units of work on machine I and (2,2,4) units of work on machine II respectively. The two machines have respectively (160,190) units of work available per day. It is given that th...

**AP Physics**

27. a)In the 1950’s, an experimental train that had a mass of 32800 kg was powered across a level track by a jet engine that produced a thrust of 4.37× 10^5 N for a distance of 465 m.Find the work done on the train. Answer in units of J. b)Find the change in kinetic...

**AP Physics**

22. a)You are a pirate working for Dread Pirate Roberts. You are in charge of a cannon that exerts a force 20000 N on a cannon ball while the ball is in the barrel of the cannon. The length of the cannon barrel is 2.19 m and the cannon is aimed at a 32 angle from the grou...

**AP Physics**

A student weighing 700 N climbs at constant speed to the top of an 8 m vertical rope in 10 s. The average power expended by the student to overcome gravity is most nearly 1. P = 560 W. 2. P = 87.5 W. 3. P = 5, 600 W. 4. P = 1.1 W. 5. P = 875 W.

**AP Physics**

15. A 3.0 kg block is pushed 3.0 m at a constant velocity up a vertical wall by a constant force applied at an angle of 30.0 with the horizontal, as shown in the figure. The acceleration of gravity is 9.81 m/s2. If the coefficient of kinetic friction between the block and...

**AP Physics**

6. a)A 1260 kg car accelerates uniformly from rest to 4.65 m/s in 2.6 s. Find the work done on the car in this time.Answer in units of J. b)Find the average power delivered by the engine in the first 1.768 s. Answer in units of W. c)Find the instantaneous power delivered by th...

**ap Physics**

1. a)A 15.6 kg block is dragged over a rough, horizontal surface by a constant force of 72.2 N acting at an angle of angle 34.8 above the horizontal. The block is displaced 24.6 m and the coefficient of kinetic friction is 0.234.Find the work done by the 72.2 N force.The ...

**Economics**

Rank in order from best to worst, the economic systems(command, market and mixed) according to which, in theory, best attempts to meet the conditions of The Human Development Index. Why did you rank them this way. I am thinking (in theory): 1-command 2-mixed 3-market The The H...

**Economics**

I have to fill in the following for a fascist economy. Ownership of resources = private Philosophers= Karl Marx (are there more?) Role of government= to controls production and allocation of resources Reaction to social and technological Change= don't know Role of nature= ...

**word problem**

a computer company gives a discount of 10% on a new piece of software.If it makes a 40% profit what percentage does the marked price exceed the cost price

**8th grade History**

Around the town of Gettysburg, Pennsylvania...

**Economics**

I am given four pictures and I am asked to determine which are needs and which are wants. They are: -An airplane -A plate of breakfast(eggs, toast, beacon) -A child's bed -A sports car I think: airplane= want plate of breakfast= need Child's bed= need sports car = want...

**Chem II**

For the reaction H2+I2, Kc=55.3 at 700K. In a 2. L flask containing an equilibrium mixture of three gases, there are .056g H2 and 4.36 g I2. What is the mass of the I2 in the flask?

**Chemistry**

Lead(II) nitrate solution reacts with potassium iodide solution to produce lead(II) iodide and potassium nitrate. The answer in the book is: Pb(NO3)2(aq) + 2 KI(aq) ---> 2KNO3(aq) + PbI2(s) I understand how to write and balance the equation. However, I am confused about how...

**math**

A manufacturer of light bulbs knows that 3% of the production of their 60W bulbs will be defective. What is the probability that exactly 5 bulbs in a carton of 144 will ne defective? Did not understand the posted answer before, need it simplified.

**math**

did not understand your answer?

**math**

A manufacturer of light bulbs knows that 3% of the production of their 60W bulbs will be defective. What is the probability that exactly 5 bulbs in a carton of 144 will ne defective?

**math (trig)**

if cos 2 theta = -(1/3) and theta is in Quadrant 2, find sin theta, cos theta, tan theta, and draw triangle theta

**trig**

If sin 2 theta = (2/5) in Quadrant 2, find sin theta, cos theta, tan theta, and draw triangle theta.

**math 65**

how do i change a fraction to a decimal

**Math**

Sorry, whenever I post, the pattern does not come out right. There should be one "I" diagonally down and to the right and one to the left of B. Same pattern with all the other letters. Thanks

**Math**

How many different paths will spell the word BINOMIAL in the following arrangement(moving diagonally downwards to the left or right)? ...B ..I I .N N N O O O O .M M M ..I I ...A L L My Answer: Starting from B using Pascal's Triangle ...B ..1 1 .1 2 1 1 3 3 1 .4 6 4 .10 10 ...

**Math**

How many different paths will spell the word BINOMIAL in the following arrangement(moving diagonally downwards to the left or right)? B I I N N N O O O O M M M I I A L L My Answer: Starting from B using Pascal's Triangle B 1 1 1 2 1 1 3 3 1 4 6 4 10 10 20 20 20 There are 4...

**math**

4 2/5 - 2 1/2 = P + 3/10

**algebra**

for a person 6 feet tall who weighs 200 pounds, find the value for k in the equation w = kh to the 3rd power

**math**

Latoya has 3/4 of a bag of popcorn. If she eats half of the popcorn at a movie , how much does she have left?

**math**

Rupert flew 3/16 of the way around the world, but George only flew 4/9 as far as Rupert how far around the world did George fly?

**AP Calculus**

A particle is moving around the unit circle (the circle of radius 1 centered at the origin). At the point (.6, .8) the particle has horizontal velocity dx/dt=3. what is its vertical velocity dy/dt at that point? a)-3.875 b0-3.75 c)-2.25 d03.75 e)3.875

**math**

Determine the domain and range of the function. 4-X^2 if x<0 f(x)= 4-2X if x≤x≤2 sqrt(x-2) If x>2

**spanish**

I have a question about this phrase translated to Spanish. "Well, yes. I enjoy studying Spanish very much." Is it this way? Pues si, yo estudio espanol mucho. or Pues si, yo estudiar espanol mucho. using the infinitive form of estudiar. Thank you.

**chemistry**

How many molecules are 100.00 grams of H2O?

**chemistry**

What is the mass of 5.00 moles of Pb(CH3COO)2?

**physics**

a 600 kg hammer of pile driver is lifted 2 meters above a piling head. what is the change in potential energy if the hammer is released, what will its speed at the instant it strikes the piling?

**Math**

Fine the size of the following matrix and its additive inverse matrix. Identify if it is a square, column, or row matrix: [ 2 -3 7 1 0 4 ]

**math**

I think you would need one of the variables because all that is telling me is 180 = 1/2bh . Are there any other variables listed?

**math**

This is about direct variation. The area a painter can paint varies directly with the amount of time he works. One morninig, he painted 204 ft² between 8 a.m. and 12:15 PM. Write a direct variation equation to describe the area y covered in x hours. The forumlua for direc...

**Trig**

Simplify: (cosx + cos2x + cos3x + cos4x + cos5x + cos6x) / (sinx + sin2x + sin3x + sin4x + sin5x + sin6x) into a single Cotangent function. Using the sum-to-products, I was able to get remove some of the addition in attempts to get full multiplication, but I could not get the ...

**math**

Find the maximum area of a rectangle inscribed between the x-axis and f(x)=-x^4+3

**Math**

Find the periodic payment that will amount to the given sum under the given conditions: S=$150,000; interest is 6% compounded semiannually; payments are made at the end of each semiannual period for 11 years.

**math**

how would 3 neighbors divide a sharing a rectangle piece of land divide it into 24 equal pieces and what fraction of land would each get

**chemistry**

how many moles of sodium ions are present in 3.50 L of 0.400 M Na3PO4?

**math**

This pattern represents the SQUARE NUMBERS: 1,4,9,16,25,36...draw a picture or diagram to explain SQUARE NUMBERS.

**science**

How often do you water basil?

**spanish**

Help with spanish!!!! Have to put correct words in the banks. 2 of them will not be used.? Querida Beth: 1) (blank) esta todo bien y esperamos que 2) (blank) tambien lo este. 3) (blank) lo pensemos y lo conversemos, tu padre y yo no estamos contentos con tu viaje. 4) (blank) e...

**Chemistry**

When titrating an acid with a base, a dilute solution of the base is used. When titrating a base with an acid, a dilute solution of acid is used. Why are these titrations done with dilute solutions?

**Chemistry**

What volume of 0.5 N nitric acid would be required to completely neutralize 300 ml of 1.0 N sodium hydroxide?

**Chemistry**

If you had one gallon of concentrated hydrochloric acid (12 N) and added water to make dilute hydrochloric acid (6 N), how much dilute hydrochloric acid would you have?

**physics**

thank you !

**chem**

In the explosion of a hydrogen-filled balloon, 0.54 g of hydrogen reacted with 6.6 g of oxygen to form how many grams of water vapor?

**marketing**

Your team has been hired by ABC company’s senior management to conduct a research project. The company has 40 employees and has been in business for 25 years. The company offers sales & service on all sizes of new Xerox copiers. The company has been faced with decreasing ...

**chemistry**

Calculate the volume of 1.80 M \rm Na_3PO_4 in milliliters that contains 6.00 g of solute.

**math figuire**

Volts divided by the amount of resistance will give you the amps.

**Biochem**

The conc is 6.0M HCL

**Physics**

Two motorcycles are traveling due east with different velocities. However, 2.16 seconds later, they have the same velocity. During this 2.16-second interval, motorcycle A has an average acceleration of 1.30 m/s2 due east, while motorcycle B has an average acceleration of 19.4 ...

**Pre Calc**

From a committee of 6 people how many sub-committees of 3 can be formed, and with 7 people and with 8 people and with n people?

**Pre Calc**

How many triangle are determind by the vertices of a hexagon, heptagon, octagon, and n-gon?

**Math**

in salem, 42% of the registered voters are republicans and 44% are democrats. the other 217 are independents. how many registered voters are there in salem?

**math**

During a football game, two players try to tackle another play. One player applies a force of 50.0 N to the east. A second player applies a force of 120.0 N to the north. What is the total applied force? (Since force is a vector, you must give both the magnitude and direction...

**Chemistry**

A 4.50 g sample of LiCl at 250 C dissolves in 25.0 ml of water also at 25.0 C.? The final equilibrium temp of the resulting solution is 60.8 C. What is the enthalpy of solution, deltaHs, of LiCl expressed in kilojoules per mole.

**CHEMISTRY**

Explain why it is quantitatively not acceptable to titrate each of the vinegar samples with the NaOH titrant to the same dark pink endpoint?

**algebra**

The perimeter of a rectangle is 128m the length is 4m more than twice the width

**statistics**

which of the following statements are correct? a. a normal distribuiton is any distribution that is not unusual. b. the graph of a normal distribution is bell-shaped. c. if a population has a normal distribution, the mean and the median are not equal. d. the graph of a normal ...

**statistics**

indicate whether the given statement could apply to a data set consisting of 1,000 vlaues that are all differnt. a. the 29th percentile is greater thatn the 30th percentile b. the median is greater thatn the first quartile c. the third quartile is greater than the first quarti...

**12th grade**

The area of a circle is 28.26 square centimeters. What is its diameter (use 3.14 for ð)?

**physics**

A big yo-yo(radius .2m, mass 20kg) has a string wrapped about its circumference. If yo-yo falls, how far does it fall in 2 seconds? (The yo-yo is shaped like a disk)

**chemistry**

100 million automobiles contains 1.1 kg of CFC-12 and leaks 25% of its CFC-12(CF2Cl2) into the atmosphere per year, how much Chlorine in kilograms is added to the atmosphere each year due to auto air conditioners?

**economics**

By 2008 the US trade deficit was still very large (roughly 5% of gross income) and our net debt position was around $5 trillion (over 1/3 of gross income). Unfortunately, it also appears that we have fallen into a major recession of uncertain duration and depth. Discuss the ca...

**Accounting**

Imagine you have been selected by your manager to present a training session to a group of new employees. The new hires do not have accounting backgrounds and have little or no work history in a responsibility center. The purpose of this training session is to explain the func...

**Physics**

A hunter aims directly at a target (on the same level) 125m away. If the bullet leaves the gun at a speed of 227 m/s, by how much will it miss the target? I'm not sure how to approach this problem. I know I need to find the horizontal distance traveled, probably by finding...

**Algebra 2**

I meant to type this one: If the sine of an acute angle is 0.8, what is the sine of twice that angle? 1.60 or .64? Thanks

**Algebra2**

I got it, .5

**Algebra2**

Help How do I figure out: (cos 40)(cos20) - (sin 40)(Sin 20) Thank you

**Right Hand Rule**

a) west b) zero deflection c) up d) down

**algebra 2**

I am taking an online class, and cant understand why when I calculate ona ti84 plus an answer I get decimal answer and my teachers answer is sq root, is there something I am not doing on my calculator? How do I convert. Example, teachers answer to the following was sin 315deg...

**algebra2**

Example, teachers answer to the following was sin 315deg = -sin 45deg = -sqrt2/2 I got a decimal answer.

**algebra2**

I am taking an online class, and cant understand why when I calculate ona ti84 plus an answer I get decimal answer and my teachers answer is sq root, is there something I am not doing on my calculator? How do I convert.

**Chemistry**

902 mL

**statistics**

The first class in a relative frequency table is 50–59 and the corresponding relative frequency is 0.2. What does the 0.2 value indicate?

**Science**

what is the relative location of the marine biome, specifically the ice cap biome?

**chemistry**

6) How many grams of copper (II) fluoride, CuF2, are needed to make 6.7 liters of a 1.2 M solution?

**calculus**

sum_(n=-1)^infinity(-1)^(n+1) (1/3)^n = 9/4~~2.25... How do you find that out? Is there a formula?

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