Saturday

February 6, 2016
Total # Posts: 1,649

**chemistry**

how to simplify (x 3-x)/(x-1)?
*September 14, 2010*

**chemistry**

15. On October 21, 1982, the Bureau if the Mint changed the composition of pennies. Instead of an alloy of 95% Cu and 5% Zn by mass, a core of 99.2 Zn and 0.8% Cu with a thin shell of copper was adopted. The overall composition of the new penny was 97.6% Zn and 2.4% Cu by ...
*September 12, 2010*

**physics**

sorry i have about 5 questions on this homework packet that i just can't figure out.... hope you can help me A bowling ball (mass = 7.2 kg, radius = 0.12 m) and a billiard ball (mass = 0.41 kg, radius = 0.028 m) may each be treated as uniform spheres. What is the magnitude...
*September 12, 2010*

**chemistry**

Mercury poisoning is a debilitating disease that is often fatal. In the human body, mercury reacts with essential enzymes leading to irreversible inactivity of these enzymes. If the amount of mercury in a polluted lake is 0.4 mg Hg/mL, what is the total mass in kilograms of ...
*September 10, 2010*

**chemistry**

that didnt have the right answer i need the steps
*September 8, 2010*

**chemistry**

2.70 g/cm3 to pounds per cubic foot
*September 8, 2010*

**math**

x^4-1/x^3=0
*August 28, 2010*

**math**

cos((sin^-1) 1/2)) sin^-1(sin 7pi/6)
*August 26, 2010*

**Math**

Vehicle A averages 14 miles per gallon of gasoline, and Vehicle B averages 36 miles per gallon of gasoline. At these rates, how many more gallons of gasoline does Vehicle A need than Vehicle B to make a 1,008-mile trip?
*August 26, 2010*

**math**

using point-slope form write an equation, perpendicular to the line y-4=-2(x-3), containing the point (3,4)
*August 25, 2010*

**math**

thank you!
*August 25, 2010*

**math**

12x^2=3x
*August 25, 2010*

**math**

whoops sorry (x-3)(x+3)>0
*August 25, 2010*

**math**

solve of x: (x-3)(x+)>0
*August 25, 2010*

**chemistry**

how would you prepare 1L of a .5M solution of each of the following? Sodium carbonate from the pure solid
*August 25, 2010*

**chemistry**

how would you prepare 1.00 L of 0.50 M solution of NiCl2 from the salt nicl2·6H2O? thanks :)
*August 24, 2010*

**chemistry**

how would you prepare 1.00 L of a .50M solution of H2SO4 from concentrated (18M) sulfric acid?
*August 24, 2010*

**college**

no you already lost me
*August 19, 2010*

**college**

Construct a frequency distribution table for the following scores. Include columns for proportion and percentage in the table. Scores: 5, 7, 8, 4, 7, 9, 6, 6, 5, 3 9, 6, 4, 7, 7, 8, 6, 7, 8, 5
*August 19, 2010*

**Algabra**

Train A travels at 100 mph in the same direction. Train B travels at120 mph on a parallel track. Train A passes a station at 8:25 pm, Train B passes the same station at 8:37 pm. What time will Train B catch Train A?
*August 15, 2010*

**trig**

on the same set of axes sketch the graph of f(x)=sin2x and g(x)=2sin x for x (o,180 degrees)
*August 1, 2010*

**Math**

PQR ~ STU. PQ = 12cm and ST = 9cm. The area of STU is 72 cm². Find the area of PQR.
*July 28, 2010*

**Chemistry**

If 75 g of ice at 0.0 Celsius were added to 1.5 L of water at 75 Celsius, what would the final temperature of the mixture be?
*July 27, 2010*

**MICROECONOMICS**

Suppose that two people, Michelle and James each live alone in an isolated region. They each have the same resources available, and they grow potatoes and raise chickens. If Michelle devotes all her resources to growing potatoes, she can raise 200 pounds of potatoes per year. ...
*July 25, 2010*

**college**

QuadPlex Cinema is the only movie theater in Idaho Falls. The nearest rival movie theater, the Cedar Bluff Twin, is 35 miles away in Pocatello. Thus QuadPlex Cinema possesses a degree of market power. Despite having market power, PuadPlex Cinema is currently suffereing losses...
*July 24, 2010*

**Math(trig)**

Peggy’s Cove Lighthouse, in Nova Scotia, is possibly the most photographed lighthouse in the world. From the observation deck, the angle of depression of a boat is 6º. How far is the boat from the lighthouse, to the nearest metre?
*July 21, 2010*

**Math(trig)**

A 10m flagpole casts an 8m shadow at the same time of day as a building casts a 60m shadow. How tall is the building?
*July 21, 2010*

**trig**

A 10m flagpole casts an 8m shadow at the same time of day as a building casts a 60m shadow. How tall is the building?
*July 21, 2010*

**PHYSIC**

a solid aluminum ingot weighs 89N in air a)what is the volume b)the ingot is suspended from a rope and totally immersed in water. what is the tension in the rope(the apparent weight of the ingot in water)?
*July 20, 2010*

**Calculus**

A 15 ft ladder is leaning against a wall.If the top of the ladder slips down the wall at a rate of 5ft/s, how fast will the foot be moving away from the wall when the top is 9ft above the ground.
*July 17, 2010*

**Calculus**

Both x and y denote functions of t that are related by the given equation. Use this equation and the given derivative information to find the specified derivative. Equation:35x^2+20y^2=1 Given that dx/dt=4, find dy/dt when (x,y)=(1/7sqrt2, 1/5sqrt2)
*July 17, 2010*

**Calculus**

Find f'(x) when f(x)=sin(1/x^3)
*July 17, 2010*

**chemistry**

how many grams of NaOH are contained in 250 mL of a 400 M sodium hydroxide solution
*July 14, 2010*

**history**

the twenty fifth amendment describes the sequence of events that would install the vice president as acting president against the will of the president. outline that sequence of events
*July 9, 2010*

**chemistry**

The vitamin niacin can be isolated from liver, yeast, milk, and whole grain. Which source would be the best for a multivitamin tablet
*July 8, 2010*

**chemistry**

The vitamin niacin can be isolated from liver, yeast, milk, and whole grain. Which source would be the best for a multivitamin tablet
*July 7, 2010*

**ap chemistry**

purpose three models that explain JJ Thomson's findings and evaluate them? What does this mean? are you suppose to make up your own or look to others?
*July 7, 2010*

**pharmacy**

2. On a job interview for a position as a pharmacy technician, the interviewer asks you what a dosage form of medication is. You respond that a dosage form is A. the way a medication is given. B. the use of a medication, either locally or systemically. C. how a medication is ...
*July 5, 2010*

**Pharmacy**

Select the abbreviation which means "make". a. a.c. b. b.i.d. c. M d. F I think it's D but I am not sure.
*July 5, 2010*

**chemistry**

an aspirin tablet contains 5.00X10^2 mg of active ingredient. how many grams of ap of active ingredient does it contain
*July 5, 2010*

**Calculus**

sketch the graph of a function f that is continous everywhere except at x=2, at which point it is continous from the right.Also it is known that f(0)=6 and f(7)=2.
*July 4, 2010*

**kindergarten**

you should make cards with easy words on them and make a picture of the meaning of the card. show it , say it and try to see if your baby can say it to . this helps by giving your baby new words to learn at this young age. i hope this helps you.
*July 3, 2010*

**kindergarten**

you should make cards with easy words on them and make a picture of the meaning of the card. show it , say it and try to see if your baby can say it to . this helps by giving your baby new words to learne at this young age. i hope this helps you.
*July 3, 2010*

**chemistry**

the announced attendance at a football game was 52,806. is this an exact number?
*July 2, 2010*

**chemistry**

you have two beakers one filled to the 100 ml mark with sugar and the other filled to the 100 ml mark with water. you pour the sugar and all the water together in a bigger beaker and stir until all the sugar is compeletely dissovlved. what happens to the mass of the solution?
*July 2, 2010*

**Calculus**

Find the Limit lim as t approaches 1 of (t^3+5t^2-13t+7)/(t^3-3t+2)
*June 30, 2010*

**history**

What were John f Kennedy's key legislation?
*June 30, 2010*

**algebra**

6x-8y=-16 8y-6x=16
*June 29, 2010*

**Biology**

what happens to co2 levels with increasing sugar concentration?
*June 29, 2010*

**10th grade Math**

1.)Explain why ironing boards always remain parallel to the floor and can be adjusted for people of various heights. You may want to consider the following: a.The legs of the board are built so that AD = BD and DE = DF, and ADF and BDE are straight lines as shown. b.Which ...
*June 26, 2010*

**Calculus**

let f(x)=(7+x)/(7-x), g(x)=7x/(7-x) Find formula for f*g and state the domain of the composition
*June 25, 2010*

**Calculus**

Write this expression as a single logarithm 6ln(x+8)+1/8lnx-ln(cosx)
*June 25, 2010*

**calculus**

let f(x)=sqrt(x-3), g(x)=sqrt(x^2+3) Find a formula for f*g and state the domain of the composition
*June 25, 2010*

**calculus**

f(x)= 1/x, x greater than 7 3x, x less than or equal to 7 Find f(7t)
*June 25, 2010*

**calculus**

find a formula for f^-1(x) f(x)=x+15/x-15
*June 25, 2010*

**calculus**

how do I rewrite it as a single logarithm
*June 25, 2010*

**calculus**

6ln(x+8)+1/8lnx-ln(cosx)
*June 25, 2010*

**Calculus**

y=x^2-11x+30 For what values of x is y greater than or equal to 0?
*June 25, 2010*

**Calculus**

f(x)= 1/x, x greater than 7 3x, x less than or equal to 7 Find f(7t)
*June 25, 2010*

**mechanics**

An empty railway wagon of mass 4500kg travelling at 15m/s collides with a stationary loaded wagon of mass 2400kg. The empty wagon bounces backwards at 4m/s. a) Find the velocity of the loaded wagon after the collision (answer was 3.49m/s) b) Find the kinetic energy lost in the...
*June 23, 2010*

**Thermal physics**

when breathing slowly a person inhales air at room temperature and exhales it at body temperature. We may assume that the lungs maintain ordinary atmospheric pressure as they expand. If a resting person inhales 0.6L of air at 24 degrees what volume does the air occupy when it ...
*June 23, 2010*

**Pharmacy**

1.This section of a monograph would tell you if the drug were soluble in water. a.description b.how supplied c.clinical pharmacology d. dosage and administration 2. Information on how to treat a patient who has taken a toxic dose of a medication would be found in this section ...
*June 23, 2010*

**Biology**

advantage and disadvantage of respiring anaerobically?
*June 22, 2010*

**Biology**

what is the relationship between the amount of starch and maltose present during starch hydrolysis.
*June 22, 2010*

**Biology**

is starch present at time zero? should it be present? why or why not?
*June 22, 2010*

**Biology**

another way to word: the effects of temperature on human and fungal amylase
*June 21, 2010*

**ENGLISH**

CAN YOU UNSCRAMBLE THIS WORD THABIAT
*June 20, 2010*

**Chemistry**

What volume of 0.123 M AgNO3(aq) is needed to form 0.657 g of AgCl(s)? 0.564 mL. 18.6 mL. 37.2 mL. 1.77 L.
*June 12, 2010*

**trig**

find the 5 other trig functions if cos(theta) = square root of 2/2 and cotangent is less than 0
*June 9, 2010*

**trig**

find the 5 other thrig functions if cos(theta) = square root of 2/2 and cotangent is less than 0
*June 9, 2010*

**Chemistry**

Write the net ionic equation for the precipitation reaction between ammonium sulfide and cadmium nitrate.
*June 7, 2010*

**Chemistry**

Write the net ionic equation for the precipitation reaction between ammonium sulfide and cadmium nitrate.
*June 7, 2010*

**Chemistry**

Write the net ionic equation for the precipitation reaction between ammonium sulfide and cadmium nitrate.
*June 7, 2010*

**Math**

make the first cut at 6cm and the second at 22cm. You will have 3 pieces that measure 6cm, 16cm and 48cm.
*June 2, 2010*

**Chemisty**

Im totally lost on how to do redox reactions. Can any one show me the steps on how to do MnO4-1 +C7H60 => Mn2 +c7H6O2? im trying to study for a test and im totally lost. thanks in advanced.
*May 31, 2010*

**science**

why is it advantageous for the stomach to be below the diaphragm rather than above it
*May 30, 2010*

**japenese**

what does furasosu mean?
*May 22, 2010*

**calculus**

Sorry, I don't understand your reply... This question has a prime after the f by the way. It's f prime, aka the derivative. That's why the function is decreasing.
*May 20, 2010*

**calculus**

f'(x) < 0 if |x| < 1 And apparently this means f is decreasing on (-1, 1). I don't understand this. I know f'(x) < 0 means the function is decreasing. But I don't understand the absolute value. It means I can put -1 or 1 inside, but wouldn't it ...
*May 20, 2010*

**6th grade**

which eurasian republic is the largest
*May 18, 2010*

**chemistry**

A 0.26 M solution of a diprotic acid, itaconic acid, has an [H+] of 6.0 10-3 M. What is the value of K1? I got answer like 2.6 10-1 ,I am not realy sure if u help me C5H6O4--> C5H5O4 + H+ K1 is constant
*May 15, 2010*

**Chemistry**

A sample of argon gas has a volume of 715 mL at a pressure of 1.34 atm and a temperature of 144 Celsius. What is the volume of the gas in milliliters when the pressure and temperature of the gas sample are changed to 622 mmHg and 321 K?
*May 15, 2010*

**chemistry**

how many joules are required to heat a frozen can of juice (360 grams) from -5C (the temperature of an overcooled refrigerator to 110C) the highest practical temperature within a microwave oven?
*May 13, 2010*

**Chemistry**

What mass of Zn will be dissolved in 10 mL pH=2 HCl solution? Zn + 2HCl--> ZnCl2 + H2
*May 10, 2010*

**physics problem**

At body temperature the latent heat of vaporization of water is Lv = 2.26e3 kJ/kg. (a) A naked person with a surface area A = 1.55 m2 and a skin temperature = 37.3 degrees is in a sauna room at T = 82.0 degrees. The person's skin has an emissivity e = 0.910. She evaporates...
*May 2, 2010*

**grammar**

why are great numbers of students choosing to pursue their college degrees using their homw computers. Benjamin Franklin Said; A penny saved is a penny earned". This principle applies to the american and foreign online student. Today students choose to take online courses...
*May 2, 2010*

**Physics ptoblem **

At body temperature the latent heat of vaporization of water is Lv = 2.26 ¡Ñ 103 kJ kg−1. (a) A naked person with a surface area A = 1.55 m2 and a skin temperature £c = 37.3 ¢XC is in a sauna room at T = 82.0 ¢XC. The person's skin has an...
*May 2, 2010*

**Physics **

The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 13 g nail when it is struck by a 550 g hammer moving with an initial speed of 4.0 m/s. I solved for the final velocities of both and got 3.8 m/s ...
*April 27, 2010*

**Physics**

3.8 m/s for the hammer*
*April 27, 2010*

**Physics**

The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 13 g nail when it is struck by a 550 g hammer moving with an initial speed of 4.0 m/s. I solved for the final velocities of both and got 3.8 m/s ...
*April 27, 2010*

**Physics**

Thanks! i was so close to that equation i just wasn't moving my total mass to the left side.
*April 27, 2010*

**Physics**

Suppose now that the air carts below are both moving to the right initially. The cart to the left has a mass m1 and an initial speed v0; the cart to the right has an initial speed v0/2. If the center of mass of this system moves to the right with a speed 6/7 v0, what is the ...
*April 27, 2010*

**trigonometry**

solve graphically. Estimate to the nearest tenth if the roots are not integers. x^2 y^2 --- + ---- =1 9 4 3x-2y=6
*April 27, 2010*

**college physics**

The energy difference between states A and B is twice the energy difference between states B and C (C > B > A). In a transition (quantum jump) from C to B, an electron emits a photon of wavelength 300 nm. What is the wavelength emitted when the photon jumps from B to A? ...
*April 26, 2010*

**Document and visual design**

correct
*April 26, 2010*

** Document and Visual Design**

30. transparencies. you can write on them like dry erase boards and they are displayed on a wall like a poster. like visual or whatever 32. dry erase boards. you have to usually mount them on a wall for the class to see before you use it.
*April 26, 2010*

**Physics**

A 150.0 g aluminum cup is filled with 450. g of water at 95℃. The combination cools uniformly by 1.20℃ per minute. At what rate (J/s) is thermal energy being removed from the combination?
*April 25, 2010*

**math**

This isn't a specific math question. I'm just looking for some tips for my calculus midterm tomorrow. I'm terrible at math and I can't seem to "think outside the box" in order to do problems correctly. I know my stuff but if a teacher throws something...
*April 25, 2010*

**Calculus**

Nevermind! I figured out you're supposed the plug the positive value into the derivative v'(t).
*April 20, 2010*

**Calculus**

Hi I have the same question. The first part is correct to find the maximum height, but while solving for the quadratic formula to find the velocity when it hits the ground, the answer is incorrect. (You would get 7.2749 and -0.27492 after solving the quadratic)
*April 20, 2010*