Friday

September 4, 2015
Total # Posts: 83

**Chemistry (Solutions)**

i really need help
*December 16, 2014*

**Chemistry (Solutions)**

the answer i got was 1500 is this correct??
*December 16, 2014*

**Chemistry (Solutions)**

Since 1991, house paint produced in Canada must contain no more than 600 ppm of lead. What is the maximum mass of lead permitted ion a 2.50 kg can of paint
*December 16, 2014*

**math**

sqrt(2(13.7)/9.8)
*October 10, 2014*

**Algebra**

Bill can mow his mother's lawn in 45 minutes. His brother Jim can mow it in 75 minutes. How long will it take them to do it together? Can someone help with with the work? But also an explanation of how it works? I want to understand this so I don't miss it on the test.
*September 6, 2014*

**Algebra**

Suppose that A = D + E and that D/A = 0.80. Solve for D/E. These are the steps I have taken, but I don't know how to proceed. 1. Divide A = D + E by A. 2. 1 = .80 + E/A 3. .20 = E/A 4. A/A = 1, D/A = .80, E/A = .20.
*September 6, 2014*

**physics**

A certain transverse wave is described by the equation y(x,t) = (6.50 mm)sin2pi((t/0.0360 s)-(x/0.280m)) Determine the wave's (a) amplitude (b) wavelength (c) frequency (d) speed of propagation and (e) direction of propagation
*July 9, 2014*

**Chemistry**

A 26.0 g sample of ice at -17.0°C is mixed with 124.0 g of water at 81.0°C. What is the equilibrium temperature?ºC.
*April 3, 2014*

**american history**

in the election of 1860, the---------- won the electoral votes of all y the free states, except a fraction of t he new jersey votes. a)constitutional union b)Whigs c)democrats d)republican
*December 17, 2013*

**Maths**

Show that 8^x =square root 2 5^x=1/square root 25 (3)
*December 1, 2013*

**Chem**

Give three examples each of household items that have: a. different structures and exhibit different properties b. same chemical make-up composition but a different structure, hence, different properties c. the same properties but with different chemical composition
*July 11, 2013*

**Chemistry**

Give three examples each of household items that have: a. different structures and exhibit different properties b. same chemical make-up composition but a different structure, hence, different properties c. the same properties but with different chemical composition (If ...
*July 11, 2013*

**Chemistry**

What is the mass of a cylinder of lead that is 2.50 cm in diameter and 5.50 cm long. The density of lead is 11.4 g/mL. Find the volume of the cylinder.
*July 8, 2013*

**algebra**

A coin is tossed 3 times. Find the probability of obtaining the following: a) heads on the first and last toss, and tails on the other toss b) at least 2 heads c) at most 2 heads
*July 7, 2013*

**algebra**

A computer repair shop has estimated the probability that a computer sent to the shop has a bad modem is 1/8, the probability that the computer has a bad CPU is 1/5, and the probability that it has a bad drive is 1/3. If we assume that modems, CPUs, and drives are independent...
*July 7, 2013*

**math**

The sales of a certain product after an initial release can be found by the equation where s represents the total number of units sold and t represents the time in weeks after release. How many weeks will pass before the product sells about 150 units? Round your answer to the ...
*June 13, 2013*

**Math**

Students raised $45 what percent of their goal did they raise if they are in goal is $60
*April 4, 2013*

**Physics**

A car with a mass of 1815 kg is traveling down a road for 50 meters. It takes the car five seconds to travel this distance. Calculate the velocity, momentum, and kinetic energy of the car.
*January 13, 2013*

**MATH **

A NICKLE HAS A MASS OF 5G AND A VOLUME OF APPROXIMALEY 0.689 CM3. WHAT IS THE APPROXIMATE DENSITY OF A NICKLE?
*December 10, 2012*

**Calculus**

ind the derivative of y= (2x^2+1)/(x-3)
*November 28, 2012*

**chemistry (molecular calculations)**

If you had 106.35 grams of Cl, how much Na would be required to convert i all to NaCl. I worked this problem and got 41.83 grams of Na, but I'm not sure if this is correct.
*November 13, 2012*

**Molecular calculations (chemistry)**

If you had 19 grams of F, how much Ca would you need to convert all of the F to CaF2?
*November 13, 2012*

**algebra**

Bad boy is fleeing the scene of a crime at 75 mph. Half an hr. later the police chase after him following his same route-traveling at 90 mph. Bad boy thought he got away... but he didn't... How long had Bad boy been traveling when the police caught him?
*October 15, 2012*

**Basic Math**

How can absolute value help one to understand the size of a quantity? Give an example. I'll appreciate anyone's help thanks. :)
*October 10, 2012*

**Basic Math**

How can absolute value help one to understand the size of a quantity? Give an example. I'll appreciate anyone's help thanks. :)
*October 10, 2012*

**Chemistry**

Upon decomposition, one sample of magnesium fluoride produced 1.65kg of magnesium and 2.58kg of fluorine. A second sample produced 1.50 kg of magnesium. How much fluorine (in grams) did the second sample produce?
*October 9, 2012*

**Chemistry**

Can someone please help me solve this homework problem for my chemistry class.It's my last problem and I'm stuck!:/ Thanks :) A 4.0*10^1kg sample of water absorbs 308KJ of heat. If the water was initially at 25.5 C, what is its final temperature?
*September 16, 2012*

**Science**

Can someone please help me solve this homework problem for my chemistry class.Thanks A 4.0*10^1kg sample of water absorbs 308KJ of heat. If the water was initially at 25.5 C, what is its final temperature?
*September 16, 2012*

**Chemistry**

When 47.3J of heat are added to 13.0g of a liquid, its temperature rises by 1.76C. What is the heat capacity of the liquid?
*September 16, 2012*

**math**

Oops,first question was wrong. Sorry. There are 30 kids in a class room.3/5 of them are girls. How many are boys and how many are girls.
*June 4, 2012*

**math**

There are 30 kids in a class. 3/5 are girls, how many of the are girls
*June 4, 2012*

**math**

Suppose the weekly use of gasoline for motor travel by adults in North America is approximately normally distributed, with a mean of 14 gallons and a standard deviation of 6 gallons. What proportion of adults use more than 18 gallons per week?
*April 16, 2012*

**Math**

If the area of a triangle is one-ninth of the area of another triangle, how do the perimeters of the two triangles compare?
*February 15, 2012*

**Math**

if the length of a rectangular pyramid is made seven times longer, how many times the volume of the original figure is the volume of the new figure?
*February 15, 2012*

**pharmaceutical calculations**

1. A chemical crystal weighs 3.630 grams in air and 1.820 grams when immersed in an oil. If the specific gravity of the oil is 0.837, what is the specific gravity of the chemical? 2. A piece of wax weighs 42.65 grams in air, and a sinker weighs 38.42 grams in water. Together ...
*February 1, 2012*

**calc**

The top half of a storage tank is a circular cylinder that is 5 meters tall and has a diameter 2 meters. The bottom half of the tank is shaped like an 8-meter inverted cone (pointed down). Let h represent the depth of the tank's contents. At t = 0 minutes, a release valve ...
*December 28, 2011*

**calc**

what is h?
*December 28, 2011*

**calc**

Suppose the function f(x)=4/x a) Use the definition of the derivative to show that f ' (-2) = -1. b) Write an equation for the line tangent to the graph of f at x = -2.
*December 28, 2011*

**calc**

Suppose the function a) Use the definition of the derivative to show that f ' (-2) = -1. b) Write an equation for the line tangent to the graph of f at x = -2.
*December 28, 2011*

**calculus**

How long will it take an investment that pays 5% compunded annually to double in value?
*November 1, 2011*

**Algebra**

(5y-3)/3 - (2y-1)/2=1 note: the divide signs are the fraction bars. -5(-2(x-1) - (x+1))=9 .08n-.09(n-2)=5-.08 -2(3-(x-1)+3x) + 2(x-3-5(x-3)-x)=10 please show me how you got the answers thanks
*November 1, 2011*

**math**

find the length of a side of a square whose area is 400 cm^2
*August 30, 2011*

**(pharmaceutical calculations)**

1. A chemical crystal weighs 3.630 grams in air and 1.820 grams when immersed in an oil. If the specific gravity of the oil is 0.837, what is the specific gravity of the chemical? 2. A piece of wax weighs 42.65 grams in air, and a sinker weighs 38.42 grams in water. Together ...
*June 20, 2011*

**Japanese**

Sorry I'm a bit late.
*April 14, 2011*

**Japanese**

No no no... It's 1) watashiwa 6:00 ni okimasu 2) 6:30 ni asagohan wo taberu 3) 8:15 ni gakkou ni iku 4) kuru,a wo tsukatte ikimasu 5) 1:05 ni ohiru gohan wo tabemasu 6) gakkou no ato ni shukudai wo yarimasu 7) 6:30 ni yoru gohan wo tabemasu 8) neru maeni Biggest Loser wo ...
*April 14, 2011*

**PHYSICS**

A thundercloud has an electric charge of 43.2 C near the top of the cloud and -38.7 C near the bottom of the cloud. The magnitude of the electric force between these two charges is 3.95 x 106 N. What is the average separation between these charges? I'm confused, help ...
*March 15, 2011*

**ALGEBRA II**

In circle O, chords AB and CD are congruent. AB measures 2x + y, while CD has a length of 16.5. Two smaller chords, GH and KL, are also congruent. GH measures x + 2y, while KL has a length of 13.5. Find the values of x and y.
*March 9, 2011*

**Physics**

I was walking through my local home supply store the other day carrying a 10 ft length of plastic pipe. The pipe was horizontal and my hand was supporting the middle of the pipe. I noticed that when I took two steps each second the ends of the pipe would move up and down a ...
*March 2, 2011*

**Hum/176**

Have ou ben able to prove your thesis in your intro paragraph? Have you opened up any avenues of dialogue or argument? Can you see how you'll relate your conclusion to your introduction and do you have enough material between, with what you've written, to fill out a ...
*February 20, 2011*

**geometry**

In right triangle ABC, angle A=3, angle B=60, and angle C=90. Find AB with AC is 12 ?
*December 5, 2010*

**12th Grade Calculus**

1. a.) Find an equation for the line perpendicular to the tangent curve y=x^3 - 9x + 5 at the point (3,5) [* for a. the answer that I obtained was y-5 = -1/18 (x-3) ] b.) What is the smallest slope on the curve? At what point on the curve does the curve have this slope? c.) ...
*November 28, 2010*

**social studies (regions)**

Regions are a way to describe and compare places. A region is identified by its common characteristics and/or features. Identify five common five common regions throughout the world accoarding to their common characteristics, (ex. Deserts: the Sahara and Gobi deserts share ...
*September 28, 2010*

**social studies (latitude & longitude)**

what is the city and continent name of these : 34° S and 58° W 34° S and 18° E 51° N and 0° 30° N and 31° E 40° N and 2° W 36° N and 4° W °°°° Please please help ! i have been trying to find the answer to these ...
*September 8, 2010*

**12th grade - Math**

Solve by Factoring: 1.) x²- x + 12 = 0 2.) 4x³ + 21x² - 18x = 0 3.) x³- x² - x + 1
*September 1, 2010*

**12th grade - Math**

1.) Explain why |8-15i| = 17
*September 1, 2010*

**Physics**

An iceboat is at rest on a frictionless frozen lake when a sudden wind exerts a constant force of 220 N, toward east, on the boat. due to the angle of the sail, the wind causes the boat to slide in a staraight line for a distance of 8.5 m in a direction 20° north of east. ...
*July 22, 2010*

**language arts **

in this sentence what is the contrast " Water like fat raindrops that fall from skinny trees "
*May 10, 2010*

**S.S**

What did Europe begin in the mid-1400s?
*April 18, 2010*

**S.S**

All it says is "Because of the important developments that shaped life as we know it today in the West, historians trace the beginnings of the "Modern Age" from these times. This pre-modern period begins with the Renaissance in about A.D. 1350 and ends with the ...
*April 18, 2010*

**S.S**

Is the Renaissance the beginning of the Modern Age?
*April 18, 2010*

**Reading **

Thank you!
*April 17, 2010*

**Reading **

I think it's 3.
*April 17, 2010*

**Reading **

In the sentence "Each autumn, some hurricanes track directly through the Bermuda Triangle." would definition 1.a path along which something travels 2.observe the progress of or 3. move over or along, fit for the word travel?
*April 17, 2010*

**Reading**

thank you
*April 17, 2010*

**Reading**

In the sentence "Ships have sunk for no apparent reason", would the word obvious, general,or simple best fit the word apparent?
*April 17, 2010*

**Reading **

Which word would fit best for the word endangered, suffering, disappearing,or menacing in the sentence "With fewer than 100 Vancouver Island marmots living in the wild, it is one of the world's most endangered animals." ?
*April 15, 2010*

**HSM/210**

what is a social policy that may affect your position as a human service worker
*April 1, 2010*

**math**

solve each system of equations by substitution. y=3x-9 please help explain how to solve this using substitution.
*May 12, 2009*

**Managerial Economics**

Which of the following cost functions exhibits cost complementarity? A. -4Q1Q2 + 8Q1 B. -4Q2 + 8Q1 C. 6Q1Q2 - Q1 D. 4Q2Q1 + 8Q1
*February 5, 2009*

**Math**

I cant figure this out, does 235+z=xy/3 or does 354+z=xy/3? thanks!
*January 23, 2009*

**Algebra**

How can this be? I am supposed to solve (-3-8i)-(-2-9i). Once it is broken down, you get (-3+2)-(8i-9i) I got -1+-1i, but my book said the answer is -1+i. Thanks for your help.
*November 19, 2008*

**Algebra**

How do you do the quadratic equation when there are only two numbers, such as -5x and 15, not the three needed?
*November 19, 2008*

**Math**

Hi everyone. Would someone be able to help me with this problems? I know it's a lot, if you only want to help with one or two, that is fine!! 9. Could you show how to use factoring and the zero-proudct property to find the zeros of each quadratic function? f(x)=x^2-9x 11. ...
*November 19, 2008*

**physical science**

My science book is exactly the same. this is what I put: 1.b 2.c 3.b 4.d 5.? I'm not sure if I am right on some of those, and I'm still looking for the answer for number 5. Hope this helped!
*November 17, 2008*

**Chemistry**

A mole of pennies stackd on top of one another would reach from here to the sun and back how many times?
*February 6, 2008*

**Managerial Economics/Math**

Which of the following cost functions exhibits cost complementarity? A. -4Q1Q2 + 8Q1 B. -4Q2 + 8Q1 C. 6Q1Q2 - Q1 D. 4Q2Q1 + 8Q1
*September 25, 2007*

**MATHMATICS**

can anyone help me with parcial products?
*September 11, 2007*

**Math**

I think you would just say 10,000 beacuse that is the nearest thousand.
*September 11, 2007*

**Pre algerba**

Name the property shown by each statment. 9+(5+35)=(9+5)+35
*August 27, 2007*

**Physics check my answers!**

Check my answers thanks! 1. A diesel automobile outputs ThermE, RadE, ElectE and KinE from an input of a. NuclE b. ChemE c. ElectE d. KinE I think its b Two race cars cross the finish line at exactly the same time but the first car is twice as massive as the second car. How ...
*February 24, 2007*

**debating**

IT WILL BE FINE DONT WORRY JUST TAKE IT EASY AND IM SURE YOU WIL THINK OF SOMETHING (LOL)(LMAO)
*November 20, 2006*

**science**

does anyone know what the effects of low level ozone is on animals and plants? Moderate to high levels of ozone causes respiratory problems in animals. it also slowly kills trees. This can be seen in portions of the San Bernardino Mountains affected by Los Angeles Basin smog. ...
*September 10, 2006*

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