Monday

March 30, 2015

March 30, 2015

Total # Posts: 79,540

**Chemistry**

Please help! If equal volumes of the following are combined, would they form buffered solutions? Why or why not? .1M HF and .05M NaF I'm am a bit confused about how I can figure out if these will form buffers or not, so I'd really appreciate it if someone could explain...
*January 19, 2015*

**ap calc**

the original should be ((x^2-4)^2)^(1/2) dx
*January 19, 2015*

**ap calc**

then how would I solve because the derivative of x^2-4 =2x and in the original there is only a dx.
*January 19, 2015*

**ap calc**

integrate ((x^2-4)^2))^(1/2) Would the 2 and the 1/2 cancel
*January 19, 2015*

**Chemistry**

If equal volumes of the following are combined, would they form buffered solutions? Why or why not? 1) .1M NaC2H3O2 and .1M HF 2) .1M HF and .05M NaF I'm am a bit confused about how I can figure out if these will form buffers or not, so I'd really appreciate it if ...
*January 19, 2015*

**chem/stats**

Find the absolute error for the answer of the following equation: square root of 3.24 plus-minus 0.08 end root equal 1.80 plus-minus ?
*January 19, 2015*

**analytical chem**

You have a bottle labeled “53.4 (±0.4) % w/w NaOH” with a density of 1.52 (±0.01) g/mL. You use 16.7 (± 0.2) mL of the NaOH to prepare 2.00 (±0.02) L of 0.169M NaOH. Report the absolute error for the 0.169M of NaOH. You may assume ...
*January 19, 2015*

**Anal Chem**

A method for the analysis of the drug diazepam in blood consistently produces results that are low by -5.4%. If the measured concentration of diazepam in a patient’s blood sample is 2.02 ppm, what must be the actual concentration in their blood (in ppm)?
*January 19, 2015*

**Analytic Chem**

You have a bottle labeled “53.4 (±0.4) % w/w NaOH” with a density of 1.52 (±0.01) g/mL. You use 16.7 (± 0.2) mL of the NaOH to prepare 2.00 (±0.02) L of 0.169M NaOH. Report the absolute error for the 0.169M of NaOH. You may assume ...
*January 19, 2015*

**Science**

Is "how did our planet form" a scientific question?
*January 19, 2015*

**math**

A survey of students determined that 14 drove to school, 28 took the bus, 8 walked, 35 shared a ride and 15 had another means of transportation to school. On a pie chart, the slice representing students who took the bus would be approximately _______ degrees.
*January 19, 2015*

**Science**

How does cell differentiation connect to other branches of science or STEAM (science, technology, engineering, art, mathematics)
*January 19, 2015*

**ap calc**

ok thanks
*January 19, 2015*

**ap calc**

where does the one half come from in F(x)
*January 19, 2015*

**ap calc**

If f(x)= (2x+7)^(1/2), where F'(X)=f(x) and F(1)=7, then F(x)=? I know I need to use integration but I do not know how to take the anti derivative of the equation
*January 19, 2015*

**calc**

if f'(x)=3x^2-2x+1 and the graph of f(x) contains the point (2,2). find f(x). Please help I know I need to use integration
*January 19, 2015*

**arithmetic**

0.2[5.28-(0.7)=
*January 19, 2015*

**mathematics **

Arrange the following fractions in ascending order 7/15,5/12,3/7
*January 19, 2015*

**English**

okay thank you!!
*January 19, 2015*

**English**

okay, but what does it mean?
*January 19, 2015*

**English **

What do you think is meant by "linguistic playfulness" ?
*January 19, 2015*

**chem**

What volume of 0.0658 M calcium hydroxide is required to neutralize 45.10 mL of 0.0242 M nitric acid?
*January 19, 2015*

**chemistry**

When hydrochloric acid reacts with magnesium metal, hydrogen gas and aqueous magnesium chloride are produced. What volume of 4.8 M is required to react completely with 2.60 g of magnesium?
*January 19, 2015*

**geometery Indirect Measurement**

For triangle MNP shown, find the value of x and the measure of each of the three angles.
*January 19, 2015*

**Calculus**

a student is drinking a milkshake with a straw from a cylindrical cup with a radius of 5cm. if the student is drinking at a rate of 3.5cm^3 per second, how fast is the level of a milkshake dropping?
*January 19, 2015*

**Biology**

You have a stock solution of 100mg/100ml methylene blue and you need 6.0 ml of final solution at 2mg/100ml. Design a serial dilution using volumes between 0.1 and 10 ml. Final volume must be 6ml.
*January 19, 2015*

**Biology**

You have a bacterial suspension and you need to dilute it to 0.0010 of the initial concentration so that you can determine the number of colonies per milliliter. The volumes must be between 0.1 and 2 ml. Your final volume must be 1 milliliter.
*January 19, 2015*

**Biology**

You need 25ml of 2% milk solution (v/v. How much milk and water will you need?
*January 19, 2015*

**Biology**

You have been asked to make 200ml of 50% detergent solution (v/v). How would you do it?
*January 19, 2015*

**Biology**

You need to prepare 270ml of a 20% sucrose solution (w/v). Sucrose has a molecular formula of C12H22O11. How would you prepare this solution?
*January 19, 2015*

**Math**

0.5 ≤ y __ 8
*January 19, 2015*

**Math**

Does (2+5i)+(-2-4i) equal to 0+1i, or i?
*January 18, 2015*

**Math**

You can cross-multiply 5 -- * 2800 7 5 -- * 400 = ???? 1 Or Divide 5 by 7 and multiply the product by 2800.
*January 18, 2015*

**physics**

You're sailboarding at 6.1m/s when a wind gust hits, lasting 6.8s accelerating your board at 0.49m/s2 at a 35∘ to your original direction. 1. Find the magnitude of your displacement during the gust. Express your answer using two significant figures. 2. Find direction...
*January 18, 2015*

**Physics**

Thanks! One question: Do I have to convert km/h to m/s at the beginning? Will I get the same answer if I convert at the end?
*January 18, 2015*

**Calc**

Find the point on the parabola x+y^2=0 that is closest to the point (0,-3).
*January 18, 2015*

**physics**

A car, initially going eastward, rounds a 90 ∘ curve and ends up heading southward. If the speedometer reading remains constant, what is the direction of the car's average acceleration vector? Express your answer using three significant figures.
*January 18, 2015*

**physics**

Write an expression for a unit vector at 45∘ clockwise from the x-axis. Express your answer in terms of the unit vectors i^ and j^.
*January 18, 2015*

**physics**

You're sailboarding at 6.1m/s when a wind gust hits, lasting 6.8s accelerating your board at 0.49m/s2 at a 35∘ to your original direction. 1. Find the magnitude of your displacement during the gust. Express your answer using two significant figures. 2. Find direction...
*January 18, 2015*

**physics**

An object is moving in the x-direction at 1.1m/s when it undergoes an acceleration a⃗ =0.56j^m/s2. Find its velocity vector after 4.8s . Express your answer as a comma-separated pair of components. Express your answer using two significant figures
*January 18, 2015*

**PED 121**

Question 3. 3. Lesson plans should be infused with local, state and national standards in order to support (Points : 1
*January 18, 2015*

**Math**

How do you write a quadratic equation with information saying that it opens upward, has a pattern of 1, 3, 5, and a vertex of (-4,5)?
*January 18, 2015*

**Mathematics arithmetic sequence**

14-3n
*January 18, 2015*

**statistics**

The 2003 Statistical Abstract of the United States reported the percentage of people 18 years of age and older who smoke. Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of .32. a. How large a ...
*January 18, 2015*

**chemistry**

Lol
*January 18, 2015*

**physics**

A car, initially going eastward, rounds a 90 ∘ curve and ends up heading southward. If the speedometer reading remains constant, what is the direction of the car's average acceleration vector? Express your answer using three significant figures.
*January 18, 2015*

**physics**

Write an expression for a unit vector at 45∘ clockwise from the x-axis. Express your answer in terms of the unit vectors i^ and j^.
*January 18, 2015*

**physics **

A model rocket is launched straight upward. Its altitude y as a function of time is given by y=bt−ct2, where b = 80m/s , c = 4.9m/s2 , t is the time in seconds, and y is in meters. 1. Use differentiation to find a general expression for the rocket's velocity as a ...
*January 18, 2015*

**chemistry**

The combustion of a compound which contains only C and H yields 2.58 g of CO2 and 0.53 g of H2O. What is the empirical formula of the compound?
*January 18, 2015*

**Physics**

the coefficient of friction between block A and the horizontal surface is 0.43. What must be the weight of teh hanging block B if this block is to descend at constant speed once it has been set into motion? Mass of block A is 5.0 kg
*January 18, 2015*

**Alcohols,phenolsðers**

I asked this question & wanna know ANS
*January 18, 2015*

**Alcohols,phenolsðers**

How2 convert CH3OH into CH3CH2OH
*January 18, 2015*

**Calculus**

1. The radius of a sphere is expanding at a rate of 14 in/min. a) Determine the rate at which the volume is changing when the radius is 8 in. b) Determine the rate at which the surface area is changing when the radius is 8 in. 2. A particle moves along a path described by y=4-...
*January 18, 2015*

**French**

Is "vieil homme" or "homme vieil" correct? I think it is the former because it describes age.
*January 18, 2015*

**Science**

guys, please give me any ideas for a investigatory project in physics ???
*January 17, 2015*

**math**

thank you so much Ms.Sue :))
*January 17, 2015*

**math**

• what is statistics • Perspective statistics • inferential statistics • Data statistics • Example of a Quantitative data • Example of a Qualitative data • What is population •what are the different scale of measurement • what are ...
*January 17, 2015*

**Calculus**

1. The radius of a sphere is expanding at a rate of 14 in/min. a) Determine the rate at which the volume is changing when the radius is 8 in. b) Determine the rate at which the surface area is changing when the radius is 8 in. 2. A particle moves along a path described by y=4-...
*January 17, 2015*

**engineering**

In an electric car, regenerative braking is used to recharge batteries. The principle of regenerative braking involves converting the kinetic energy of the vehicle into energy stored in a battery. If a car is traveling at a speed of 30 km/h and is stopped completely by braking...
*January 17, 2015*

**AP CHEMISTRY**

an unknown metal reacts with chlorine to produce 6.84 g of metal chloride. when metal chloride dissolves in 100 mL of solvent the metal ion concentration is 0.43 M. What is the unknown metal?
*January 17, 2015*

**algebra**

the picture will be hung on a wall where the distance from the floor to ceiling is 8 feet. The center of the picure must be 5 1/4 feet from the floor. Determine the distance from the ceiling to the top of the picture frame.
*January 16, 2015*

**Math**

Miguel is 5 feet 10 inches tall. On a sunny day he casts a shadow 4 feet 2 inches long. At the same time, a nearby electric tower casts a shadow 8 feet 9 inches long. How tall is the tower? How do I set this up into ratios to figure out the tower height?
*January 16, 2015*

**Math**

A blue rope is three times as long as a red rope. A green rope is 5 times as long as the blue rope. If the total length lf the three ropes is 508.26 meters, what is the length of the blue rope?
*January 16, 2015*

**math(5th grade)**

Pls help me
*January 16, 2015*

**physics**

A person is standing on and facing the front of a stationary skateboard while holding a construction brick. The mass of the person is 89.0 kg, the mass of the skateboard is 4.10 kg, and the mass of the brick is 2.50 kg. If the person throws the brick forward (in the direction ...
*January 15, 2015*

**Biology**

You need to prepare a 0.25 M solution of NaCl but you only need 50 ml of this solution. How many grams of NaCl would you need?
*January 15, 2015*

**Biology**

How many grams of glucose are needed to make 500ml of a 3.0M solution of glucose?
*January 15, 2015*

**Biology **

You need to make 2.5L OF 3M H2SO4. H2SO4 comes as a stock solution in a concentration of 18M. How many ml of stock H2SO4 would you need to make the new solution?
*January 15, 2015*

**5th grade science**

How might the history of the United states be different if the first European settlements had occurred on the west coast instead of the east coast
*January 15, 2015*

**Math**

When a tire is labeled "185/70/14" that means it is 185 mm wide, the sidewall height (from the rim to the road) is 70% of its width, and the wheel has a diameter of 14 in. What is the tire's sidewall height?
*January 15, 2015*

**science**

Fertilizers and pesticides applied to farm fields in Pennsylvania have made their way to Chesapeake Bay Maryland, this is an example of _____________ pollution.
*January 15, 2015*

**SS**

Did the Spanish come to the Americas with Columbus, or did they come later?
*January 15, 2015*

**SS**

But did he ever come to know of the truth?
*January 15, 2015*

**SS**

Did Columbus come to know that he was not in India when he reached the Caribbean? I find mixed answers online.
*January 15, 2015*

**alegbra 1**

x+y=5 x-3y=3
*January 15, 2015*

**math**

cost of levelling of circular ground @ 25 paisa/square meter is 2500.Help me find the radius of this ground
*January 15, 2015*

**solid mensuration**

a high way curve is to be laid out on a circle. what radius should be used if a trailer truck is to change direction by 28 degrees in a distance of 112 meters?
*January 15, 2015*

**solid mensuration**

a certain city block is in the form off parallelogram. two of it's side are each 225 meters long, the other two sides are each 145 meters long. if the distance between the first two pair is 80 meters. find the area of the land in the block and the length of the diagonals.
*January 15, 2015*

**Math**

When Minnesota became a state in 1858 there were approximately 150,000 people living here. in the 2010 census the population for Minnesota was 5,303,925 people. Find a model that would apprxoimate the population in Minnesota between 1858 and 2010. Let t=0 correspond to 1858. ...
*January 14, 2015*

**health**

if a client is working on reducing stress what should the fitness professional suggest as a first step
*January 14, 2015*

**Logarithms**

Prove that log base a of x divided by log base a/b of x is equal to 1+log base a of(1/b) Where do I start?
*January 14, 2015*

**Calculus POwer RUle**

If the slope of the curve y=−kx^3+ 3k at x=-2 is 3, then what is the value of k?
*January 14, 2015*

**School**

Okay, Thanks to both of you!
*January 14, 2015*

**School**

Like for example when he talks about Eli Whitney and Interchangeable parts we have a little section in the notes that we have to fill in but we do it after he's done talking. Even though he'll tell us what goes in the blank, I miss information he tells us beforehand
*January 14, 2015*

**School**

Yeah he usually gives us printed notes where we just fill in blank spaces. He tells us what to fill it in with after he's done talking about the topic. But before we fill in the notes, he usually explains to use the topic which where I drift off
*January 14, 2015*

**School**

Because I'm not the type of learner who can just sit there and remember the information so I just hope there are some tips
*January 14, 2015*

**School**

I have a question.. So my teacher just talks the whole class about information and the thing is.. I'll be listening but then after awhile I'll accidentally wander off and just miss information I needed to know. Are there good tips for me to just stay focused the whole ...
*January 14, 2015*

**history**

thanks!
*January 14, 2015*

**history**

Which of the following was neither part of the Confederacy nor th eUnion? A. Minnesota b. Texas C. Michigan D. Colorado Minnesota? On second thought, Michigan???
*January 14, 2015*

**science**

I grand daughter has this fill in the blank: Electically__________ objects push or _____________ on other electrically charged objects. This produces___________. Please fill in the blanks please. Because we don't know... Thanks!!!!
*January 14, 2015*

**Math**

So that means d wasn't correct?
*January 14, 2015*

**Math**

Mr. Jenkins is going to buy museum tickets for a class trip. The museum director quotes him the following prices: • 20 tickets cost a total of $250. • 30 tickets cost a total of $375. • 50 tickets cost a total of $625. a. Based on these prices, is the cost of ...
*January 14, 2015*

**Physics**

Two identical objects of the same mass and at the same initial temperature cool off. If object A cools off faster than object B, what can you say about the specific heats of the two objects?
*January 14, 2015*

**math**

thank you yes it is hard to explain
*January 14, 2015*

**math**

Ms. Sue can you please help?
*January 14, 2015*

**math**

I just want to see if my answers are correct and if no, can you please show your work and explain how to do it? Thank you. A. (x^1/2)^4√x^6 I got an answer of x^2x B. √x^4y^12 I got an answer of xy C. 3√a^6b^3 I got an answer of a^2b D. (x^1/3y)^3√x^2y^...
*January 14, 2015*

**Law**

many attorneys pose issues beginning with the word: a. "here" b. "now" c. "whether" d. "whatever" My answer: C
*January 14, 2015*

**math**

whats 9+10
*January 14, 2015*

**math**

You need to hire a part-time associate to work 30 hours a week in your store. You have $250 in labor budget for the new associate each week. You just interviewed an excellent candidate for the position who has requested to be paid $9.00 per hour. Your average part-time ...
*January 14, 2015*

**accounting**

n kjj
*January 13, 2015*

Pages: <<Prev | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | **23** | 24 | 25 | 26 | 27 | 28 | 29 | Next>>