Thursday

November 27, 2014

November 27, 2014

Total # Posts: 844

**chemistry**

what is the molality of 18 g NaCl in 200 g of H2O?
*November 25, 2014*

**Math **

A savings account at Xyz bank offers 4% interest, compounded annually. How much money must I invest today in order for the account to grow to $5,000 in ten years? Answer to the nearest whole dollar.
*November 21, 2014*

**Inverses of functions**

−9+f−1(a−1)=−12 f(−3)=2
*November 12, 2014*

**Chemistry**

What mass (in grams) of sodium chloride, NaCl, is needed to make 422. g of a 3.39%(m/m) NaCl solution? (atomic masses: Na = 22.99, Cl = 35.45)
*November 7, 2014*

**Physics **

A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. A constant tangential force of 200 N applied to its edge causes the wheel to have an angular acceleration of 1.048 rad/s2. (a) What is the moment of ...
*October 28, 2014*

**Physics **

The four masses shown in the figure below are connected by massless, rigid rods. moi-cog-problem-fig (a) Find the coordinates of the center of gravity of this object if MA = 120 g and MB = MC = MD = 180 g x = ? m y = ? m (b) Find the moment of inertia about an axis that passes...
*October 28, 2014*

**geometry**

QRST is a trapezoid. If angle S is equal to 23 degrees, what is the measure of angle T
*October 20, 2014*

**Math**

(pi/4,3)=(x,y) d/dx 3cot^4x= 12cot^3x d/dx cotx= -csc^x d/dx x=1 (12cot^3x)(-csc^2x)(1) m=-12cot^3xcsc^2x equation to the tangent line would be y-3=-12cot^3xcsc^2x(x-pi/4) ?
*October 2, 2014*

**Math**

Find the equation of the tangent line to the graph of y=3cot^4x at x=pi/4 3cot^4(pi/4)=3(1)=3
*October 2, 2014*

**physics**

An object is being thrown upward at 50m How long does it take the object to reach maximum height? What is the maximum height of the object? How much time does it take for the audit to return to its original position? What is the velocity of the object when it hits the ground? ...
*October 2, 2014*

**Math (Implicit Differention)**

it is x^(2/3)
*October 2, 2014*

**Math (Implicit Differention)**

((x^2)/3)+((y^2)/3)=4 d/dx 2x/3 + d/dx 2y/3 (y')= 0 y'= -(2x/3)-(2y/3) at the point (-1,3sqrt3) y'=(-2(-1)/3)-(2(3sqrt3)/3)=(2/3)-((6sqrt3)/3)=(2/3)-2sqrt3 Answer is (2/3)-2sqrt3 correct?
*October 2, 2014*

**Physical Science 8th grade**

A balloon filled with air does not rise as a balloon filled with helium. What does this tell you about the density of helium? A. Helium is more dense than air B. Helium is less dense than air C. The two gases have the same density D. When heated, helium becomes more dense
*September 8, 2014*

**statistics**

The human resources department of an engineering company gives IQ tests to a randomly selected group of new hires every year. They claimed that the mean IQ score of new hires, , from this year is greater than or equal to the mean IQ score of new hires, , from last year. This ...
*August 3, 2014*

**math**

The polynomial x 3 + 5x 2 -57x -189 expresses the volume, in cubic inches, of a shipping box, and the width is (x+3) in. If the width of the box is 15 in., what are the other two dimensions? ( Hint: The height is greater than the depth.)
*June 9, 2014*

**Prevents**

If a book would cost 36 dollars and it had 10 percent of discount how much would the book cost after the discount
*May 28, 2014*

**math**

If it takes a runner 15 minutes to run a mile how many miles would he run in two and half hours.
*May 5, 2014*

**math **

If it takes a runner 15 minutes to run a mile how many miles would he run in two and half hours?
*May 5, 2014*

**pre calculus**

a gun with a muzzle velocity of 1200 feet per second is fired at an angle of 6 degrees above the horizontal. find the component form of a vector. verify the magnitude
*May 5, 2014*

**Math**

The quarterback of a football team releases a pass at a heights of 7 feet above the playing field, and the football is caught at a height of 4 feet, 30 yards directly downfield. The pass is released at an angle of 35 degrees with the horizontal. The parametric equations for ...
*April 21, 2014*

**Precalculus**

The quarterback of a football team releases a pass at a height of 7 feet above the playing field, and the football is caught at a height of 4 feet, 30 yards directly downfield. The pass is released at an angle of 35 degrees with the horizontal. The parametric equations for the...
*April 21, 2014*

**trig**

A plane is flying due south at a speed of 192 mph. a wind is blowing in at 53 degrees at 13 mph. what is the bearing of the plane?
*March 27, 2014*

**Math-Statistics**

Assume your expected lifetime income is $1.5 million and the standard deviation is $250,000. a) What is the chance that you will earn more than $1.1 million during your lifetime? b) What is the chance that you will earn less than $2 million during your lifetime? c) What is the...
*March 24, 2014*

**english**

Which synonym of the word look would be most effective in the following sentence? Detective Flint leaned forward with narrowed eyes to _______ what appeared to be a vital clue. A. survey B. scrutinize C. view D. ogle I think it's B.
*March 21, 2014*

**Science**

All them are wrong.. Just thought I would tell you
*March 20, 2014*

**geometry**

A person riding the original Ferris Wheel is traveling at a speed of 0.495 mph. If one revolution takes 9 minutes, what is the diameter of the Ferris Wheel? Show your work.
*March 19, 2014*

**health**

Drinking in moderation or not drinking at all will typically lead to? A. Weight gain B. Heart disease C. Weight loss D. High blood pressure
*March 18, 2014*

**Math **

XY= -25 what is the constant of variation for this relationship? a. 1/4 b. -25 c. -2.5 d. -0.4
*March 11, 2014*

**math**

A student has a penny, nickel, dime, and quarter distributed two coins apiece to his front two pants pockets. What is the probability that the front right pocket has more then 30 cents in it?
*March 8, 2014*

**math**

A truck drove 1400 miles at a rate twenty miles per hour slower on the return trip. If the trip took 22 hours total, how fast was the truck going on the return trip? Round your answer to the nearest hundredth.
*February 27, 2014*

**math**

Find the original price of a pair of shoes if the sale price is $56 after a 20% discount
*February 24, 2014*

**Math**

Thanks everyone
*December 14, 2013*

**Math**

SO ITS 20 PEOPLE?
*December 14, 2013*

**Math**

a restaurant charges a reservation fee of $15 for its party room, plus $21.50 per person. If the bill was $445, how many people were at the party? HELP PLEASE! IS THE ANSWER 30?
*December 14, 2013*

**chemistry**

2. What is the percent yield of Mg3N2 if 73.9 g of Mg reacts with 31.6 g of N2 to produce 79 g of Mg3N2 according to the following chemical reaction? (Reaction may or may not be balanced.) mg+n2=Mg3N2
*November 26, 2013*

**Geometry**

Jason designed an arch made of wrought iron for the top of a mall entrance. The 11 segments between the two concentric circles are each 1.25 m long. Find the total length of wrought iron used to make the structure. Round the answer to the nearest meter. and there's a ...
*November 20, 2013*

**American Governent**

List and Explain three duties of members of the executive office of the president.
*November 11, 2013*

**math**

identify an integer x for which 2x/5 represents a ratio greater that 2:1 but less than 3:1 could 2.4 be a possible answer?
*November 11, 2013*

**math**

anyone...PLEASE!!!
*November 11, 2013*

**math**

I really need help with this problem! Thanks so much!
*November 11, 2013*

**math**

identify an integer x for which 2x/5 represents a ratio greater that 2:1 but less than 3:1
*November 11, 2013*

**Math**

In a AAA map of Ohio, 1 inch equals approximately 10 miles or 18 kilometers. If the distance on the map between Pauling and Eaton is 9.8 inches, how many kilometers is it between the two towns?
*November 11, 2013*

**chemistry**

n an experiment, Ann mixes concentrated sulfuric acid with water in a reaction test tube. The walls of the test tube turn hot. What type of reaction has occurred?
*October 21, 2013*

**geometry**

For 1 through 10, what is the area and volume of the given shape, if the length of one side of the base is 6, the height is 8, and the slant height is 10? (Not all shapes will require all three numbers.) The shape is a right prism with: 1. an equilateral triangle as the base
*September 23, 2013*

**prealgerbra & introductory algebra**

-22+y=y/-14
*September 21, 2013*

**Intermediate Algebra**

Thank you so much, I couldn't figure out what to multiply both sides with. Again this is an awesome website.
*September 21, 2013*

**Intermediate Algebra**

y/11=3
*September 21, 2013*

**Math**

a pharmacist found at the end of the day she had 7/4 as many prescriptions for antibiotics as tranquilizers. She had 66 prescriptions altogether. How many did she have for tranquilizers?
*September 5, 2013*

**AP Physics**

You can obtain a rough estimate of the size of a molecule by the following simple experiment. Let a droplet of oil spread out on a smooth water surface. The resulting oil slick will be approximately one molecule thick. Given an oil droplet of mass 10.00 multiplied by 10-7 kg ...
*September 4, 2013*

**math**

9x^4-x^2=0 step by step
*September 2, 2013*

**math**

Titus deposited $1,508.49 in a savings account that earns 4.2% simple interest. What will Titus's account balance be in 8 months?
*August 29, 2013*

**English**

If someone speaks candidly, she is most likely speaking ; ~honestly ~quietly ~sarcastically
*August 28, 2013*

**English**

Which of the following was not a popular genre during the Victorian era; detective fiction, gothic fiction or postmodern fiction?
*August 28, 2013*

**composition 1**

How do I start a good readers response?
*August 26, 2013*

**calculus**

how would you solve a problem like this for X: (1/3=(3^2x+2)
*August 18, 2013*

**Chemistry **

In the following reaction, how many grams of ferrous sulfide will produce 0.56 grams of iron oxide? 4FeS+7O2->2Fe2O3+4SO2 The molar mass of ferrous sulfide is 87.92 grams and that of iron oxide is 159.7
*June 26, 2013*

**Physics**

An object whose mass is unknown is held by two rigid rods. The whole system is at rest. The angle between the vertical direction and the left rod from point A to B is 60 degrees. The angle between the vertical direction and the right rod from point C to D is 30 degrees. The ...
*June 24, 2013*

**PHYSICS**

Two cars lost in a blinding snowstorm are traveling across a large field, each thinking they are on the road, as shown in the figure on the left. They collide. If the distance x is 150 meters and the red car is travelling at 19.1 mph, how fast to the nearest hundredth of a mph...
*June 6, 2013*

**Physics**

A pinhole camera has a small circular aperture of diameter D. Light from distant objects passes through the aperture into an otherwise dark box, falling on a screen at the other end of the box. The aperture in a pinhole camera has diameter D = 0.600 mm. Two point sources of ...
*June 2, 2013*

**Algebra 2 **

The functions f(θ) and g(θ) are sine functions, where f(0) = g(0) = 0. The amplitude of f(θ) is twice the amplitude of g(θ). The period of f(θ) is one-half the period of g(θ). If g(θ) has a period of 2pi and f (pi/4) = 4, write the function ...
*May 24, 2013*

**Algebra**

Square root 18 + (3/square root 2)
*May 8, 2013*

**Algebra**

Square root 18 + 3/square root 2
*May 7, 2013*

**Math**

Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after ...
*May 2, 2013*

**algebra 1**

*I have asked countless people to help me with this story problem and nobody seems to know how to do it! Please help! Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C ...
*May 2, 2013*

**algebra 1**

Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after 37...
*May 1, 2013*

**Math**

Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after 37...
*May 1, 2013*

**Math**

For a seesaw that 14 ft long, where should the fulcrum be placed to balance a 204 lbs adult and a 81.6 lbs child?
*April 24, 2013*

**math**

A 4inch-thick concrete slab is being poured for a circular patio 14 feet in diameter. Concrete costs $55 per cubic yard. Find the cost of the concrete, to the nearest cent.
*April 11, 2013*

**English**

An international agreement that aims to reduce carbon dioxide emissions and the presence of greenhouse gases. Countries that ratify the Kyoto Protocol are assigned maximum carbon emission levels and can participate in carbon credit trading. Emitting more than the assigned ...
*April 8, 2013*

**Algebra**

Matt ate a total of 100 raisins over a five day period. Each day he ate six more raisins than the previous day. How many did he eat the first day?
*March 30, 2013*

**Algebra**

Three ships leave New York for France on the same day. The round trip takes the first ship 12 days, the second ship 16 days and the third ship 20 days. How many days will elapse before all three ships again leave New York on the same day? Assume continuous trip activities for ...
*March 29, 2013*

**statistics**

The average homicide rate for the cities and towns in a state is 10 per 100,000 population with a standard deviation of 2. If the variable is normally distributed, what is the probability that a randomly selected town will have a homicide rate greater than 14?
*March 24, 2013*

**Physical science **

Help Please . Aisha drops an antacid tablet in water and times how long it takes to dissolve. Which of the following will decrease the reaction rate? A.increasing water temperature B.decreasing water temperature C.using more water
*March 22, 2013*

**physical science**

A. increasing water temperature B decreasing water temperature C.using more water
*March 22, 2013*

**physical science **

Help please. Aisha drops an antacid tablet in water and times how long it takes to dissolve. Which of the following will decrease the reaction rate?
*March 22, 2013*

**chemistry**

a 225.0 g sample of an unknown, silver, pure metal was heated to 95.5 degrees celsius then put into 150.50 g of water at 22.5 degrees celsius. the water was heated by the hot metal to a temperature of 31.4 degrees celsius. what is the specific heat? what is the metal?
*March 18, 2013*

**chemistry**

thank you , but what do I substitute the specific heat metal for to find out what it is?
*March 15, 2013*

**chemistry**

a 225.0g sample of an unknown, silver, pure metal was heated to 95.5 degrees Celsius and then put into 150.50g of water at 22.5 degree Celsius. the water was heated by the hot metal to a temp. of 31.4 degree Celsius. what is the specific heat of the metal and what is the metal?
*March 15, 2013*

**chemistry**

what mass of a sample of gold requires 1.75 kJ to change its temperature from 28.2 degrees Celsius to 89.5 degrees Celsius?
*March 15, 2013*

**math**

in a triangle, the measure of the first angle is twice the measure of the second.the measure of a third triangle is 64 degrees more than athe measure of the second angle. Use the facts that the sum of the measures of the three angles of a triangle is 180 degrees to find the ...
*March 13, 2013*

**Math**

What is the value of x x/60 = 1/2/1/6
*March 11, 2013*

**Math**

An architect is drawing a scale model of a new mall. The real mall will be 1800 feet long. The scale the architect is using is 1 inch is equal to 100 feet. How long will the model be?
*March 11, 2013*

**Math**

A ladder has a shadow 3.5 meters long. Marlowe’s shadow is .75 meters long. If Marlowe is 1.5 meters tall, how tall is the ladder?
*March 11, 2013*

**Math**

A pole has a shadow that is 5 feet long. Jackie's shadow is 3 feet long, and she is 6 feet tall. How tall is the pole?
*March 11, 2013*

**Math**

A pole has a shadow that is 5 feet long. Jackie's shadow is 3 feet long, and she is 6 feet tall. How tall is the ladder?
*March 11, 2013*

**Chemistry**

How much heat (kcal)is needed to melt 14 ice cubes? Each cube is at 0c and has a mass of 28grams.
*March 4, 2013*

**trig**

10sinB+5 = sinB+5
*March 1, 2013*

**chemistry**

At 0*C a 1.0-L flask contains 5.0 x 10^-2 mol N2, 1.5 x 10^2 mg O2, and 5.0 x 10^21 molecules of NH3. What is the partial pressure of each gas, and what is the total pressure in the flask?
*March 1, 2013*

**Physics**

a 0.67 kg rubber ball has a speed of 2.2 m/s at point a and kinetic energy 7.1 J at point B find the total work done on the ball as it moves from a to b
*February 27, 2013*

**Physics**

a 0.67 kg rubber ball has a speed of 2.2 m/s at point a and kinetic energy 7.1 J at point B find the total work done on the ball as it moves from a to b
*February 27, 2013*

**Physics**

A current of 4.6 A is measured through a 7.8 ohms resistor for 1.75 minutes. How much heat is generated by the resistor?
*February 26, 2013*

**Physics**

A current of 4.6 A is measured through a 7.8 ohms resistor for 1.75 minutes. How much heat is generated by the resistor?
*February 26, 2013*

**math**

A marathon runner ran the first 5 mi. in 32.5 min. If she continues running at this pace, how long will it take her to run the entire marathon of 26.2 mi?
*February 21, 2013*

**math**

A factory produces bicycles 6 motorcycles in 9 hours. Write a proportion and solve it to find how many hours it takes to produce 16 motorcycles
*February 19, 2013*

**Math**

A basketball star earned $2,000,000 last year. He played in 64 games for an average of 42 minutes per game. Find these rates dollars per game dollars per minute of playing time
*February 14, 2013*

**Math**

Mr. quark drove his car 314 miles in 6.5 hours. He used 12.7 gallons of gas. Find these rates. gallons per mile
*February 14, 2013*

**Math**

Mr. quark drove his car 314 miles in 6.5 hours. He used 12.7 gallons of gas. Find these rates
*February 14, 2013*

**Statistics**

If student A scored 42 on a test of reading and the test had a mean of 52 and a standard deviation of 8, what percentage of test respondents scored below student A?
*February 13, 2013*

**Biostats **

If the average (xbar) on an assignment in a class was 82% with a standard deviation (s) of 4.8, what is the z-score for someone scoring 75% (round to the one hundredths place or two decimal places)?
*February 3, 2013*

**Physics**

If a 60 kg meteor falls to earth from a great distance. How much gravitational potential energy does it lose? (the energy PE is 0 at a great distance). What happens to this potential energy? Final-Initial=-Gmm/r-0=change in energy
*January 31, 2013*

Pages: **1** | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | Next>>