Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 1,665

**math**

a drug is supplied as a 20 mg/ml solution in a 50 ml vial. you need to make 15 ml of a 10 mg/ml solution. how much concentrate and how much diluent are needed to obtain the desired final volume?

**math**

what is procentage strength of a mixture made from 250 ml of witch hazel containing 16% alcohol, 150 ml of 90% alcohol and 450 ml of distilled water?

**math**

you have mixed equal parts of a 10 % and a 2,5 % benzocaine ointment what is the resulting concentration?

**math**

you have mixed 25g of 2%crem into 35g of 6% cream. What is the resulting concentration?

**math**

A patient needs 45% dextrose 100ml The pharmacy has only 70% dextrose 500ml. a) how much concentrate will you need b) how much diluent

**finance**

A year ago, the Alpine Growth Fund was being quoted at an NAV of $21.50 and an offer price of $23.35; today, it’s being quoted at $23.04 (NAV) and $25.04 (offer). Use the approximate yield formula or a handheld financial calculator to find the rate of return on this load ...

**Finance**

An investor in the 28% tax bracket is trying to decide which of two bonds to select: one is a 5.5% U.S. Treasury bond selling at par; the other is a municipal bond with a 4.25% coupon, which is also selling at par. Which of these two bonds should the investor select? Why?

**world history**

What parallels, or differences, can you identify between Athenian expansionism in the age of the Peloponnesian War and the contemporary career of the American republic

**calc 1**

find the derivative f(x)= (x^4+x^2+1)/(x^2+1)

**Calc**

find the derivative f(x)= e^-3x x sin(4x)

**history**

10 examples of racism/white supremacy.

**math**

what is the even numbers here 13, 12, 10, 19, 16? what is the odd numbers here 17 18 15 16 11?

**Physics**

In the figure, a uniform ladder of weight 200 N and length 10 m leans against a perfectly smooth wall. A firefighter of weight 600 N climbs a distance x up the ladder. The coefficient of static friction between the ladder and the floor is 0.50. What is the maximum value of x f...

**Phys**

Centripetal force: a race car driver wants to stay as straight as possible around the curves in the race. What should happen to his radius, force and velocity?

**spanish**

I haven't had a chance to meet with my Spanish professor about my composition and I need to turn it in soon. It's basically just a short past narration (15 sentences) using only the preterite and imperfect. If someone could read through it and let me know what things I...

**chemistry**

CH(CH3)2-NH-CH2-CH2-CH2-CH3

**chemistry**

I can't seem to figure out the name of this organic molecule. I know it's an amine, but that's it. There are two methyls (CH3) attached to a CH, followed by (in order) NH, CH2, CH2, CH2, and CH3. (ignore the ^^^, I had to use them so the atoms would line up) ^^^^^^...

**chemistry**

Nevermind! I finally solved it! It was 3,3-diethyl-1-pentyne (I forgot I had to write 3 twice).

**chemistry**

My "picture" of the molecule didn't work. Hopefully, this will work better (~ represents a triple bond and ignore the ```) ````````CH3 ````````CH2 HC ~ C - C - CH2 - CH3 ````````CH2 ````````CH3

**chemistry**

I'm having trouble naming this organic chemistry compound. (I'm not sure how to include a picture in this, so I'll try my best to explain it in words and attempt to type it out) The full formula is C9H16. It's an alkyne and the longest carbon chain is 5 carbons...

**physics**

Earthquakes are essentially sound waves—called seismic waves—traveling through the earth. Because the earth is solid, it can support both longitudinal and transverse seismic waves. The speed of longitudinal waves, called P waves, is 7800m/s . Transverse waves, called...

**chemistry**

"Write equations for the half-reactions that occur at the anode and cathode for the electrolysis of the following aqueous solution: CuBr2(aq)" Possible oxidation reactions: 1. 2Br- -> Br2 + 2e- = -1.09 2. 2H2O -> O2 + 4H+ + 4e- = -1.23 Possible reduction reacti...

**math**

Mr.Ricci spent 1/3 of his salary on food and 2/5 of the remainder on transport. What fraction of his salary did he have left? If he had $600 left, find his salary.

**Math**

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

**physics**

Find the mass of 0°C ice that 10g of 100 °C steam will completely melt

**Business**

#1 Is C. Industry. #3 It's not D. In the study guide it says to prepare the introduction and overview last. It's not B. I used that in my test and it was wrong. I'm stuck between C and A. I don't know 2 or 4.

**math**

guess my rule with two rules. Having such as hard time understanding this and would like to be able to explain to my 2nd grader! home wor sheet has 2 circles joined togeather, rule A has 2 girls in it with glasses, in the middle there is another girl with glasses, in rule B th...

**Writing**

Hey Sam was the answer right?

**physics**

A 0.20-kg object is attached to the end of an ideal horizontal spring that has a spring constant of 120 N/m. The simple harmonic motion that occurs has a maximum speed of 2.0 m/s. Determine the amplitude A of the motion.

**Chemistry Check Please! ?Fixed**

A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water. a) What is the molality of the resulting solution? b) What is the mole fraction of water in this solution? B) moles of h2o=118g/18(g/mol)=6.548 mol moles of c12h22O11= 3.44g/342.3(g/mol)=0.01...

**Chemistry Check Please!**

A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water. a) What is the molality of the resulting solution? b) What is the mole fraction of water in this solution? B) moles of h2o=118g/18(g/mol)=6.5556 mol moles of c12h22O11= 3.44g/342.3(g/mol)=0.1...

**Chemisty Check Please!**

B) moles of h2o=118g/18(g/mol)=6.5556 mol moles of c12h22O11= 3.44g/342.3(g/mol)=0.10049 mol 6.5556 mol/(6.5556 mol + 0.10049 mol= 0.984902 mol A) M= (0.10049)/(0.00344 kg + 0.118 kg)= 0.82749 m c12h22O11

**Chemisty**

A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water. a) What is the molality of the resulting solution? b) What is the mole fraction of water in this solution?

**Math**

Select the x-coordinate of the vertex of the parabola defined by the function f(x) =-5x^2+7x+8

**Math - Check my answer?**

Thank you!

**Math - Check my answer?**

Write the decimal 0.063 as a percent. Answer choices: 0.63% 6.3% 63% 630% MY ANSWER: 6.3%

**Check my answer?**

Thank you so much!

**Check my answer?**

Write the fraction 8/9 as a percent. Round to the nearest hundredth of a percent where necessary. My answer: 88.9%

**MATH**

It would take you a long time to measure the length across town with feet. C. length of your room, would be a more logical answer.

**math**

There were 10 more boys than girls at an outing. Each boy was given 3 sweets and each girl was given 4 sweets. A total of 156 sweets were given to the children. How many girls were there at the outing?

**ELA**

Oh okay thanks I'll just ask my teacher for help. Thanks anyways

**ELA **

Give an example of an simile using only the words butterfly and meadows.

**math**

If you were moving at a speed of 0.00025 kilometers per hour, what is your speed in meters per minute?

**pre-calc help**

Thank you so much!!!

**pre-calc help **

Convert the rectangular coordinates to polar coordinates with r > 0 and 0 ≤ θ < 2π. (9, −9) (r, θ) = ?

**pre-calc help**

Thank you so much!

**pre-calc help **

Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.) 5 sin^2(x)- 21 sin(x)+ 4 =0

**South America**

What is the longitude and latitude of every piece of south America?

**Pre-Calc (Prove the identity)**

Prove the identity. (show your work please) tan(x − π/4)= (tan x − 1)/(tan x + 1) Thank you!

**algebra**

4(5n-7)=10n+2

**math**

What's the opposite reciprocal of 1?

**Calculus**

Nevermind, got it.

**Calculus**

A spotlight on the ground is shining on a wall 12m away. If a woman 2m tall walks from the spotlight toward the building at a speed of 0.6m/s, how fast is the length of her shadow on the building decreasing when she is 2m from the building?

**Physics**

If the mass of a planet is 0.571 times that of the Earth and its radius is 0.787 times that of the Earth, estimate the gravitational field g at the surface of the planet. The gravitational acceleration on Earth is 9.8 m/s2. Answer in units of m/s2

**Physics**

In the Bohr model of the hydrogen atom, the speed of the electron is approximately 2.1 × 106 m/s. Find the central force acting on the electron as it revolves in a circular orbit of radius 4.51 × 10−11 m. Answer in units of N

**Science**

b

**Math**

Make up a data set of at least 12 numbers that have the following landmarks Maximum 18 Mode 7 Range 13 Median 12 Make a bar graph of the data

**Chemistry**

The bottle was previously opeedn, thus altering the water content. This is because hydrates do not keep their stoichiometric ratio of cations and anions to water molecules. Hope this helps.

**Math**

Combine like terms and solve 6a + 5a = -11 6a+5a = 11a 1) 11a = -11 /11 /11 2) a = -1

**math**

Just break it down 4 (10's)= 10+10+10+10 = 4*10 = 40 5 (10's)= 10+10+10+10+10 = 5*10 = 50 9 (1's)= 1+1+1+1+1+1+1+1+1= 9*1 = 9 You can also rewrite the problem this way 40 < x < 50 This means the number has to be between 40 and 50, but it must also have 9 ones...

**algebra**

A statue is 8 feet tall. The display case for a model of the statue is 18 inches tall. Which scale allows the tallest model of the statue that will fit in the display case. A 1 inch : 2 inches B 1 inch : 7 inches C 1 inch : 5 inches D 1 inch : 10 inches

**English**

What is the tone of at the lunch counter?

**Algebra, HELP! PLEASE!**

In triangle ABC, angle B is four times as large as angle A. The measure of angle C is 12∘ more than that of angle A. Find the measures of the angles.

**Physics **

two objects move toward each other collide and separate. there was no net external force acting on the objects but some kinetic energy was lost. is momentum conserved ? what is the explanation ?

**math**

= 27600 X 100/115 = 24000

**Physics **

An object with mass 20 kg is moving horizontally. if the velocity of the object is doubled, does the momentum increased or decreased ? what is the explanation ?

**math**

4/57(x+8)=1/3

**Chemistry**

3.00 g of Zn is allow to react with 1.75 g CuSO4 . calculate how many grams of Zn will remain after the reaction is complete ?

**Chemistry**

suppose 8.00 g of CH is allowed to burn in the presence of 9.00 g of oxygen. how much (in gram) CH4 , O2 and H2O remain after the reaction is complete ?

**Chemistry**

0.300 moles of bromine gas (Br2) and 0.500 moles of chlorine gas (Cl2) react to for tribromochlorine (Br3Cl). how many moles of this product will form ?

**biology**

Why all enzyme work well in their own optimum temperature and optimum pH ? i need more explanation about why different enzyme have different optimum temperature and different optimum pH to react. i hope to get a long explanation for my essay that contain 5 marks.

**Harvard Justice**

According to the Professor Sandel, if judgments about the good are unavoidable in debates about justice and rights, is it possible to reason about the good (these judgments about the good)? a) If reasoning about the good means that you must have a single principle or rule or m...

**biology**

Do all enzymes function within the different temperature range, like they do with pH?

**physics**

as i have known that centripetal force is directly proportional to the angular speed square. so, what is the relationship between angular speed and centripetal force ? when centripetal force increase, does angular speed increase too? i need more explanation.

**math**

solve my system of equation with full steps 3x+4y=29 2x–5y=-19

**english**

use athlete in the sentence an ____ training requires long hours of exercises.

**physics**

what is the source of error occur in experiment Standing Waves (tuning fork)?

**Physics Experiment**

sorry, wrong typo... the answer is when the water level is lower, the air in the glass tube. the changing of the L is to match the natural frequency of the air column inside the glass tube with the tuning fork that vibrate at fixed frequency. when the matching is achieve, the ...

**physics**

what is the source of error occur in experiment Standing Waves (tuning fork)?

**Chemistry**

Henry's Law says: Pressure(gas)=(Henry's Law Constant)(Molarity of the gas)… we are looking for Molarity so we can rewrite the above equation as… Molarity of the gas=Pressure(gas)/(Henry's Law Constant) so… M=1.95 bar/29.4 barM-1 the bar units cancel...

**phy**

An engine absorbs 2000j of heat from a hot reservoir and expels 750j to a cold reservoir during each poerating cycle, (i)what is the efficiency of the engine (ii)How much work is done during the cycle? (iii)What is the power output of the engine if each cycle last for 0.5 seco...

**phy**

(Q1)A gas occupies a certain volume at 27c.If it is heated at constant pressure, its volume is exactly doubled at a temperature of. (a)54c(b)219c(c)327c(d)600c (Q2)If the specific heat capacity of water initially is4.2000/kg/k and the difference in temperature of water between...

**phy**

(Q1)the temperature at which the tungsten filament of a 12v and 36w lamp operates is 1730c.If the temperature coefficient of resistance of tungsten is 0.006/k, find the resistance of the lamp at room temperature of 20c (a)10.00(b)0.45ohms(c)0.39ohms(d)4.00ohms (Q2)At what temp...

**phy**

(Q1)A wire of cross- sectional area of 0.00006m2 and length 50cm stretches by 0.2mm under a load of 3000n.Calculate the Young's modulus for the wire (a)80000000000Nm-2(b)125000000000Nm-2(c)25000000000Nm-2(d)5000000000Nm-2 (Q2)a square plate of side 10cm is made of a metal ...

**phy**

(Q1)calculate the electric power which must be supplied to the filament of a light bulb operating at 3000k. the total surface area of the filament is 0.000008m2 and iits emissivity is 0.92.(a)20.3w (b)33.8w(c)46.4w(d)56.7w (Q2) calculate the change in internal energy of 2kg of...

**phy**

an ungraduated mercury thermometer attached to a millimeter scale reads 22.8mm in ice and 242mm in steam at standard pressure. What will the millimeter read when the temperature is 20

**Chemistry **

How do I calculate this? How many grams of CaCl2 is in 500 mL 0.1 M solution of CaCl2

**physics**

A 2.0-m-tall, 30-cm-diameter concrete column supports a 3.0×105kg load. By how much is the column compressed (in mm) ?

**Math**

7/3a + 2/5= ?

**business math**

paychecks each week will be as follows : $325 x 40 = $13,000 (gross earnings /week) $13,000 x 0.062 = $806 (total combined social security) $13,000 x 0.0145 = $188.50 (total medicare taxes) social security : 806 medicare: 188.50

**physics **

A box is placed 50 cm away from a double convex lens. The image is on the opposite side of the lens, is inverted and 50 cm away from the lens. find: a)the focal length of the lens. b)the height of the image. c) using the focal length that you found, how far from the lens would...

**MATH **

1- increase 1000 dollars by 10% then decrrese ur answer by 10% wat do u notice? 2- my parents increased my pocket money by 10% then 3 months later increased it by further. 10%'. My father said there was an increase of 21% , can u explain this?

**Algebra**

Thank you

**Algebra**

You are building a rectangular deck. The area of the deck should be 250 ft squared. You want the length of the deck to be 5 ft longer than twice its width. What should the dimensions of the deck be? My work: 250=2x(x+5) Is this correct so far?

**Frenchhhhhhhhhh**

Thanj u all

**Frenchhhhhhhhhh**

1- avez vous des eu 2- tu en as / des as? 3- elles des ont?

**Frenchhhhhhhhhh**

Replace the capitalized words with either, le,la,en,des..

**Frenchhhhhhhhhh**

Please help! I have to replace 1- avez-vous eu DES CADEAUX pour votre anniversaire? 2- tu as des COURS DE FRANÇAIS tous les jours? 3-elles ont beaucoup D'AMIS au collége??

**Algebra **

Use the zero product property to solve the equation: -3n(2n-5)=0

**AP English Lit**

Thank you so much! I appreciate it. :)Kate

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