# Posts by Kelly

Total # Posts: 1,761

**chemistry**

in trial one the mass of silver oxide is .5g. The mass of silver metal product is .431 grams. In trial two the silver oxide=.498 and silver metal=.388. Use the conservation of mass to calculate the mass of oxygen that combined with the silver

**physics**

how do you divide 1.49457 x 10^11 by 3.00 x 10^8? thanks for the help

**algebra**

solve the equation m-26/5-5m-28/6=2

**Physics**

The ratio R at which paint can be sprayed from a spray gun may be expressed as R=a.t and R is measured in m3 / s and time is measured in seconds, what are the units of "a"?

**physics**

Using dimensional analysis, which one of the following equations is dimensionally correct? ( a → m/s2, v → m/s, x → m , t → s)

**math**

312 yd.

**Math**

I don't know if I suppose to do LCM or other?I'm going to need help. Beyonce visits her parents every 6 days and Jay-Z vists his parents every 9 days. When will it be the first day they visit there parents on the same day?

**economics**

What institutions might arise in the free market to help a person decide whether to accept or reject a particular private monetary note?

**Math**

what is are some free websites that can give me rational and irrational practice?

**chemistry**

thank you

**chemistry**

calculate the specific heat (j/g C ) for each of the following: -an 18.5-g sample of tin that absorbs 183 J when its temperature inceases from 35.0 degrees C to 78.6 degrees C

**chemistry**

how to simplify (x 3-x)/(x-1)?

**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 ...

**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...

**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 ...

**chemistry**

that didn't have the right answer i need the steps

**chemistry**

2.70 g/cm3 to pounds per cubic foot

**math**

x^4-1/x^3=0

**math**

cos((sin^-1) 1/2)) sin^-1(sin 7pi/6)

**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?

**math**

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

**math**

thank you!

**math**

12x^2=3x

**math**

whoops sorry (x-3)(x+3)>0

**math**

solve of x: (x-3)(x+)>0

**chemistry**

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

**chemistry**

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

**chemistry**

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

**college**

no you already lost me

**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

**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?

**trig**

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

**Math**

PQR ~ STU. PQ = 12cm and ST = 9cm. The area of STU is 72 cm². Find the area of PQR.

**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?

**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. ...

**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...

**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?

**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?

**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?

**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)?

**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.

**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)

**Calculus**

Find f'(x) when f(x)=sin(1/x^3)

**chemistry**

how many grams of NaOH are contained in 250 mL of a 400 M sodium hydroxide solution

**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

**chemistry**

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

**chemistry**

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

**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?

**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 ...

**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.

**chemistry**

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

**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.

**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.

**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.

**chemistry**

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

**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?

**Calculus**

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

**history**

What were John f Kennedy's key legislation?

**algebra**

6x-8y=-16 8y-6x=16

**Biology**

what happens to co2 levels with increasing sugar concentration?

**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 ...

**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

**Calculus**

Write this expression as a single logarithm 6ln(x+8)+1/8lnx-ln(cosx)

**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

**calculus**

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

**calculus**

find a formula for f^-1(x) f(x)=x+15/x-15

**calculus**

how do I rewrite it as a single logarithm

**calculus**

6ln(x+8)+1/8lnx-ln(cosx)

**Calculus**

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

**Calculus**

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

**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...

**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 ...

**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 ...

**Biology**

advantage and disadvantage of respiring anaerobically?

**Biology**

what is the relationship between the amount of starch and maltose present during starch hydrolysis.

**Biology**

is starch present at time zero? should it be present? why or why not?

**Biology**

another way to word: the effects of temperature on human and fungal amylase

**ENGLISH**

CAN YOU UNSCRAMBLE THIS WORD THABIAT

**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.

**trig**

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

**trig**

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

**Chemistry**

Write the net ionic equation for the precipitation reaction between ammonium sulfide and cadmium nitrate.

**Chemistry**

Write the net ionic equation for the precipitation reaction between ammonium sulfide and cadmium nitrate.

**Chemistry**

Write the net ionic equation for the precipitation reaction between ammonium sulfide and cadmium nitrate.

**Math**

123:45

**Math**

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

**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.

**science**

why is it advantageous for the stomach to be below the diaphragm rather than above it

**japenese**

what does furasosu mean?

**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.

**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 ...

**6th grade**

which eurasian republic is the largest

**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

**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?

**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?

**Chemistry**

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

**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...

**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...

**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...

**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 ...