Friday

July 31, 2015

July 31, 2015

Total # Posts: 1,180

**chemistry**

What is the pH of a solution made by adding grams of NH4Cl, to 550 mL of 0.205 M NaOH?
*April 20, 2011*

**math**

can some one help 3>4+5+
*April 19, 2011*

**substition algebra**

solve x & y: 3X-6Y(-6X+34)=30
*April 19, 2011*

**Math**

Sean's mom was 27 years old when he was born. When Sean is 14 years old his mother's age will contain the same two digits as Sean's age. The next time that Sean's age and his mother's age contain the same 2 digits ____ years later.
*April 19, 2011*

**Math**

Today Justin reached 1/11 the age of his mother was when he was bron. Today, Justin's mother is _____ times as old as Justin.
*April 19, 2011*

**Math**

find the derivative f(x)= 4xe^x f(x) = ln (2z-11)^7 f(x) = ln (x-1/3x+1)
*April 17, 2011*

**chemistry**

. Given the following stocks 4M NaCl, 3M NaOH, 5M HCl (a) Prepare 200ml of a solution containing 0.5M NaCl and 0.1M (b) Prepare 300ml of a solution containing 0.5M NaCl (c) Prepare 200ml of a solution containing 0.5M NaCl and 0.1M HCl
*April 15, 2011*

**algebra**

Tad was delivering lunch to a local office building. His first delivery was to the middle floor of the building. He then took th elevator up 4 floors for the next delivery, down 6 floors for his third delivery, and up 7 floors for his final delivery. He was then on the top ...
*April 14, 2011*

**physics**

At the equator, the earth’s field is essentially horizontal; near the north pole, it is nearly vertical. In between, the angle varies. As you move farther north, the dip angle, the angle of the earth’s field below horizontal, steadily increases. Green turtles seem to...
*April 14, 2011*

**Fractions**

Add the following. 1/2+3/12+1/4; 3/12+1/2+1/4;5/6+1/3;1/4+3/8+1/4
*April 13, 2011*

**Fractions**

Crate has 24 pieces of fruit . 1/2 are oranges, 1/4 are mangos and 2/8 are pineapples. Howmany oranges are there, how many mnagos and how many pineapples? Al ate 1/8 of a sandwich,Bob ate 1/8, then Bill ate 1/4. How much did they eat all together? What fraction was left. 24 ...
*April 13, 2011*

**Fractions**

24 students. 2/3 have brown hair, the rest blond hair. How many students have brown hair. What fraction of the students have blonde hair and how many students is that?
*April 12, 2011*

**Fractions**

Actually the question was wrong> 24 pieces of fruit. 1/2 are oranges, 1/4 are mangos, and 2/8 are pineapples. How many oranges, how many mangos and how many pineapples are there?
*April 12, 2011*

**Fractions**

Ms.Perez has a crate of 24 pieces of fruit. 1/2 are oranges, 1/4 are mangos, and 2/3 are pineapples. How many or oranges? How many or mangos? How many are pineapples?
*April 12, 2011*

**math**

stacy multiplied 5x9 and said the answer was 44. what two patterns could you use to show that her answer is not correct?
*April 5, 2011*

**math**

Shawna thinks that 8x2=17. what number pattern shows that she not correct?
*April 5, 2011*

**math **

Select a variable (mean, proportion, variance or standard deviation) of interest to you and collect data consisting of at least 30 values. Define the variable. Define the population. Describe how the sample was selected. Use Microsoft Excel (and MegaStat if at all possible) to...
*April 4, 2011*

**Physics**

A radioactive nucleus is at rest when it spontaneously decays by emitting an electron and neutrino (as shown in the figure below ). The momentum of the electron is 8.11 x 10−19 kg·m/s and it is directed at right angles to that of the neutrino. The neutrino's ...
*March 28, 2011*

**Physics**

A radioactive nucleus is at rest when it spontaneously decays by emitting an electron and neutrino (as shown in the figure below ). The momentum of the electron is 8.11 x 10−19 kg·m/s and it is directed at right angles to that of the neutrino. The neutrino's ...
*March 27, 2011*

**Physics**

A radioactive nucleus is at rest when it spontaneously decays by emitting an electron and neutrino (as shown in the figure below ). The momentum of the electron is 8.11 x 10−19 kg·m/s and it is directed at right angles to that of the neutrino. The neutrino's ...
*March 27, 2011*

**Calculator help**

i have a ti 83, and i want to plug this equation r=1+cos(theta)( this is polar coordinates) into my calculator but the graph does not look right. i think i messed around with the windows or table set menu and i cant fix it. can someone tell me what numbers i should put in my ...
*March 26, 2011*

**Physics -- Help!!**

If you launch a ball precisely 8' vertically how long does it take to go from the ground to 8' and back to the ground? If you then launch the same ball precisely 10' vertically, how much longer will it take to return to the ground?
*March 24, 2011*

**Physics**

I launch a ball vertically precisely 8' in the air. Then I launch a ball vertically 10' in the air. How much longer will it take the ball to travel 10' versus 8'? Put differently, how much more time does it take the ball to go the 2' further (travelling up ...
*March 24, 2011*

**Physics**

When mass M is at the position shown, it is sliding down the inclined part of a slide at a speed of 1.89 m/s. The mass stops a distance S2 = 2.1 m along the level part of the slide. The distance S1 = 1.18 m and the angle θ = 35.10°. Calculate the coefficient of ...
*March 24, 2011*

**Math **

If a player makes an average of 60% of his free throw attempts, what is the probability he will make both shots of a one-and-one (to have an opportunity to shoot a second free throw he must make the first)?
*March 24, 2011*

**calc**

find the arc length of f(x)=x^2/2
*March 15, 2011*

**chemistry**

what is the molarity if 0.5 grams of sodium chloride is dissolved to make 0.05 mL of solution?
*March 14, 2011*

**unit circle**

how does the direction ( clockwise or counterclockwise effect the values of the unit circle? what does it mean?
*March 12, 2011*

**physics**

A car is driven east for a distance of 49 km, then north for 21 km, and then in a direction 30° east of north for 27 km. Determine (a) the magnitude (in km) of the car's total displacement from its starting point and (b) the angle (from east) of the car's total ...
*March 10, 2011*

**English**

Explain why rhythm and rhyme are used in epic poetry.
*March 10, 2011*

**algebra**

Given that XY =21 and 1 < x < 2, find the sum of the upper and lower bounds of Y. Express your answer as a decimal.
*February 27, 2011*

**trig**

if cos(pi/4) is sqrt2/2 i thought sec(pi/4) is 2/sqrt 2,but its just sqrt 2 . can some one please explain.
*February 27, 2011*

**Algebra**

The five-digit number 31d26 ----- is divisible by 3. Find the sum of all possible values of d.
*February 27, 2011*

**algebra**

Find the number of square units in the area of the region in the first quadrant which is bounded by x = 4, the y-axis, y = 2, and y = 8.
*February 27, 2011*

**CALC**

INTEGRAL OF Y^2/(25+Y^2)
*February 26, 2011*

**world history**

How did the Renaissance contribute to the Age of Exploration? by emphasizing the importance of converting people to Christianity by awakening a spirit of discovery and innovation in Europe by fostering a belief in the importance of working as a group by persuading Europeans ...
*February 21, 2011*

**calc**

find integral using table of integrals ) integral sin^4xdx this the formula i used integral sin^n xdx =-1/n sin^n-1xcosx +n-1/n integral sin^n-2 using the formula this is what i got: integral sin^4xdx=-1/4sin^3xcosx+3/4 integral sin^2xdx= -1/2sinxcosx+1/2 integral 1 dx can ...
*February 20, 2011*

**algebra**

a speaker was so boring that one-half of the audience left after a few minutes. Five minutes later, one-third of the remaing audience left. Ten minutes later, one-fourth of those remaining left, leaving only nine people in the audience. How many people were in the audience at ...
*February 19, 2011*

**geometry**

The road rose at an 8 degree angle, what is the grade?
*February 15, 2011*

**math**

A peddler is taking eggs to the market to sell. The eggs are in a cart that holds up to 500 eggs. If the eggs are removed from the cart 2,3,4,5, or 6 at a time, one egg is always left over. If the eggs are removed 7 at time, no eggs are left over. How many eggs are in the cart?
*February 14, 2011*

**Symbolic Logic**

1) Give a general proof to show that for all sentences X and Y and for every consistent set Σ of sentences, if X and Y are logical consequences of Σ, then the set {X, Y} is consistent. 2) Let C be a logical consequence of the set {P1, P2, P3} and of the set {P1, P2, ...
*February 12, 2011*

**chemistry**

at 25˚c the density of water is 0.997g/cm³,the density of ice at -10˚c is 0.917g/cm³. if a soda can volume is 240 ml is filled then frozen at -10˚c, what volume does solid occupy?
*February 1, 2011*

**Algebra**

What system of equations do I use to solve the following question? A boat traveled 336 miles downstream and back. THe trip downstream took 12 hours. THe trio back took 13 hours. What is the speed of the boat in still water What is speed of the current?
*January 31, 2011*

**math**

first find the common denominator of 6 so you get 2/6 + 5/6 then you add straight across to get 7/6 over 2/5. when you divide the fractions, take the denominator and flip it to then multiply straight across so, you have 7/6 * 5/2 = 35/12
*January 31, 2011*

**Manufacturing **

Discuss how it is possible that schools put up barriers to enrolling a child with emotional disabilities
*January 30, 2011*

**Statistics**

Given a mean of 60 and a standard divation of 7, what proportion of scores is between 45 and 78? What is the formula for determining this proportion?
*January 27, 2011*

**Statistics**

Given a mean of 60 and a standard divation of 7, what percentate of scores ae 73 or less? What is the formula for determining this value?
*January 27, 2011*

**Algebra**

Lee took a survey for the school newspaper and received the following data about the number of hours classmates studied per week: (1,2,4,5,6,8,9,10,10). Express as a common fraction the positive difference between tthe median and mean of this set of data.
*January 26, 2011*

**trig**

a plane is flying at an altitude of x with the distance at 800 meters with an angle of 70 degress. what equation would you use to solve. tan70= x/800 tan70= 800/x sin70= x/800
*January 26, 2011*

**chemestry**

an oilo slick 110 nm 1.0 * 10^6 square meters of ocean.How many liters of oil are in the slick
*January 24, 2011*

**com/155**

five sentences about the role of education in successful financial planning
*January 23, 2011*

**Chemistry**

CH3COOH + H2O = CH3COO- + H3O+ Acid acetic is a weak acid so not all of it will dissociate. The constant for acid acetic is 1.8 . 10^-5 therefore 1.8x10^-5=(x^2)/(0.2-x) x is the amount that disociated solve the equation and x is 1.88x10^-3 pH=-log(pH)=-log(1.88x10^-3)=2.72
*January 23, 2011*

**Physics**

A laser emitting at 632.8nm illuminates a double slit. A screen is positioned 2.00 m from the slits. Interference fringes are observed with a separation of 1.0 cm. (a) Determine the separation of the slits. (b) Determine the angle of the first-order dark fringes.
*January 16, 2011*

**social studies 20-1 (URGENT)**

thats the thing i do not know what these sources mean and how they relate to nationalism. if smeone explains them to me then i can do the rest myself.
*January 13, 2011*

**social studies 20-1 (URGENT)**

examine each source below and write in paragraph form, a response in which you: -interpret each source to identify and explain the perspective(s) related to Nationalism. -identify and discuss one or more ideological concepts that are refleted in the sources. -Use your knowlage...
*January 13, 2011*

**Math**

you are 70 meters from train and road crossing with the train going 60meters per second, after 4 seconds has fast is the train traveling away from you?
*January 8, 2011*

**calc**

A kite 100 ft above the ground moves horizontally at a speed of 8 ft/s. At what rate is the angle of elevation between the string and the horizontal decreasing when 200 ft of string have been let out?
*January 2, 2011*

**chem100-1**

Can eletrolysis be used to separate salt in the sea int o elemental sodium and clorine gas -- somthing like 2NaCl --> 2Na + Cl2 ?
*December 28, 2010*

**economics**

"The Fed should simply increase the money supply at the same rate that the full employment economy grows, and the government should desist from any stabilizing urges." What school of thought would make this suggestion, and how do economists of that school justify ...
*December 20, 2010*

**physics**

A car of mass 1979 kg drives over a semicircular hilltop of radius 12.6 m and through a semicircular valley of radius 17.2 m with a constant velocity of 7.28 m/s. What is the normal force on the car at the bottom of the valley? would i use the equation mv^2/r +mg ?
*December 19, 2010*

**algebra**

two runners jog around an oval path at constant rates, but in opposite direstions. one runner completes a lap every 10 minutes, and the other does a lap every 12 minutes. how many minutes elapse between consecutive meetings of the runners? express answer as a mixed number.
*December 16, 2010*

**physics**

if you exert a force of 500 N to walk 4 m up a flight of stairs in 4 s, how much
*December 15, 2010*

**math**

Six people are going to be seted in a row of 8 chairs. How many different ways may they be seated?
*December 15, 2010*

**help me please physics**

A monatomic ideal gas expands from point A to point B along the path shown in the drawing. (a) Determine the work done by the gas. J (b) The temperature of the gas at point A is 198 K. What is its temperature at point B? K (c) How much heat has been added to the gas during ...
*December 10, 2010*

**Physics**

1.2x2x34/30 Distance between two crest points is 1.2x2 Distance between 35 crest points is 1.2x2x34. Note a crest is a point. One may not measure the time duration of a crest point. I've just noted that waves and crests are both used in such problems. The total distance is...
*December 6, 2010*

**honors physics**

A 3.2 kg block is hanging stationary from the end of a vertical spring that is attached to the ceiling. The elastic potential energy of this spring/mass sytem is 2.1 J. What is the elastic potential energy of the system when the 3.2 kg block is replaced by a 5.3 kg block?
*December 1, 2010*

**economics help**

I need a specific article that deals with monopoly power, either regulated or illegal attempts at monopolization.
*November 30, 2010*

**medical billing and coding**

Your answer is in your books, you need to find the answers there. We can guide you, but you need to do the reading also.
*November 28, 2010*

**Pen Foster Child Care**

Are you looking for someone to give you tha answers to all the questions on your test ?
*November 28, 2010*

**Physics**

A satellite of mass 210 kg is launched from a site on Earth's equator into an orbit at 210 km above the surface of Earth. (a) Assuming a circular orbit, what is the orbital period of this satellite? (b) What is the satellite's speed in its orbit? (c) What is the ...
*November 24, 2010*

**Physics**

200N
*November 22, 2010*

**Math**

Write the following fractions in increasing order: 45/44, 5/4, 12/11
*November 21, 2010*

**algerba**

A person wins 500 points in a game. What is the corresponding number?
*November 21, 2010*

**algebra**

_3r+18=6r add 3r to ech side of equation. 18=9r dived each side by 2 2=r r=2
*November 21, 2010*

**short story, part 2**

an auther's purpose in using rhetoric is to? a. create a certain effect for the reader b. present facts as they realy are c. provide hints as to whats going to happen d. seperate realism from idealism
*November 17, 2010*

**Financial and managerial accounting**

1. Use the following data for questions 1 and 2.On March 12, 2005, Trio, Inc. acquired melting equipment for $37,000. The estimated life of the equipment is 7 years, with an estimated residual value of $9,000.Refer to above data. In its financial statements, Trio uses straight...
*November 17, 2010*

**Financial and managerial accounting**

1. Use the following data for questions 1 and 2.On March 12, 2005, Trio, Inc. acquired melting equipment for $37,000. The estimated life of the equipment is 7 years, with an estimated residual value of $9,000.Refer to above data. In its financial statements, Trio uses ...
*November 17, 2010*

**college**

Doug Corporation purchased Leslie Company's entire business for $3,200,000. The fair market value of Leslie's net identifiable assets is $2,900,000.
*November 16, 2010*

**interest rate**

what must the interest rate be if an investment is to double its value in 15 years, compounded monthly in decimal form, rounded to 3 significant figures
*November 13, 2010*

**compounded interest**

calculate the future value of an investment of $8,500 if it is to be invested for 9 years at an interest rate of 6.1%, compounded quarterly.
*November 13, 2010*

**physics**

if you exert a force of 500 N to walk 4 m up a flight of stairs in 4 s, how much power do you use?
*November 11, 2010*

**Chemistry**

How many atoms of carbon are found in 5.94 grams of acetic acid?
*November 9, 2010*

**Social Studies**

What countries are neighbors with brazil.
*November 8, 2010*

**Social Studies**

Name the industries in brazil
*November 8, 2010*

**Social Studies**

Who are the leaders in brazil and their position and name
*November 8, 2010*

**Social Studies**

What are the issues in brazil
*November 8, 2010*

**Social Studies**

What type of people live in brazil
*November 8, 2010*

**Calculus**

How do you find the area under the witch of agnesi? (for all radii)
*November 6, 2010*

**Statistics**

An insurance company estimates 40 percent of its claims have errors. The insurance company wants to estimate with 90 percent confidence the proportion of claims with errors. What sample size is needed if they wish to be within 5 percent of the actual?
*November 5, 2010*

**physics**

A baseball is hit at ground level. The ball reaches its maximum height above ground level 2.6 s after being hit. Then 2.1 s after reaching its maximum height, the ball barely clears a fence that is 96.4 m from where it was hit. Assume the ground is level. (a) What maximum ...
*November 3, 2010*

**physics**

A rifle that shoots bullets at 460 m/s is to be aimed at a target 47.0 m away. If the center of the target is level with the rifle, how high above the target must the rifle barrel be pointed so that the bullet hits dead center? (Neglect air resistance.)
*November 3, 2010*

**physics**

A soccer player kicks the ball toward a goal that is 28.6 m in front of him. The ball leaves his foot at a speed of 18.5 m/s and an angle of 30.6° above the ground. Find the speed of the ball when the goalie catches it in front of the net. (Note: The answer is not 18.5 m/s...
*November 3, 2010*

**physics**

A diver springs upward from a board that is three meters above the water. At the instant she contacts the water her speed is 9.00 m/s and her body makes an angle of 71.0° with respect to the horizontal surface of the water. Determine her initial velocity, both magnitude ...
*November 3, 2010*

**statistics**

Scores on the Stanford Binet Intelligence Scale (SBIS) are distributed as normal with a mean of 100 and a standard deviation of 16. Use the probabilities under the Normal Curve to answer the following questions. a. A child scored 84 on the SBIS. What is his z score? -1 b. What...
*November 1, 2010*

**STATISTIC**

Mrs. Carlson has discovered that the students in her class who watch a larger amount of television do more poorly on her exams compared to those who watch a smaller amount of television. Which of the following conclusions can Mrs. Carlson draw? Explain your answer. a. Watching...
*November 1, 2010*

**Chemistry **

I need help with What is the solubility of silver oxide, Ag2O, in a solution buffered at pH 10.50? The Kc for the following equilibrium is 2.0 x 10-8. Express your answer in g/L Ag2O(s) + H2O(l) ¡ê 2Ag+ (aq) + 2OH- (aq)
*October 25, 2010*

**college**

Organic chemistry question. I need help with a couple of questions on organic groups. What are some products that contain: Alkynes, Aromatic (benzene), Ethers, Aldehydes, Ketones, and Acids. I also need to know some of the harmfull effects that each one of them can cause.
*October 24, 2010*

**physics**

h=49.62m 49.62m-11m for the wall clear of the top = 38.62 4.9 its from multiplying 1/2(-9.8m/s^2) 1/2(ay)
*October 24, 2010*

**bilogy**

paper explaining how the organism in the diagram has evolved physiologically to become suited to its environment. Make sure to reference the diagram you located in your paper.
*October 20, 2010*