Thursday
January 29, 2015

Posts by ANONYMOUS


Total # Posts: 76,840

Math
fill in the missing number originally: ? new price: $3.80 15% decrease how do you find the original price? help!
January 20, 2015

chemistry
A 12.42 gram sample of a mixture of NaCl and CaCl2 is dissolved in water and all the chloride is precipitated as AgCl. If the AgCl precipitate has a mass of 31.70 grams. How do I find the mass percentage of each component in the original mixture?
January 20, 2015

Trig/Precalc
Okay, thanks so much for your hints on the first one! I got it using a combination of point-slope form and arc tangents. I'll wait to hear more on #2 if you have the time :)
January 20, 2015

Chemistry
if you start with 20.0g of phosphorus 30.0g of oxygen gas, and 15.0g water, what is the maximum mass of phosphoric acid that can be formed?
January 20, 2015

Pre-Calc
A page that is x inches wide and y inches high contains 30 square inches of print. The margins at the top and bottom are 2 inches and the margins on the side are 2 inch wide. A. show that the total area A on the page is A=2x(2x+7)/(x-4) B. determine the domain of the function ...
January 20, 2015

English
yes
January 20, 2015

English
Endurance to keep doing something for a long period of time like sports
January 20, 2015

English
Is endurance a physical challenge
January 20, 2015

physics
In a physics lab, students are asked to predict how the acceleration of the block sliding up a ramp compares to the acceleration down the ramp compares to the acceleration down the ramp. The block slides up a somewhat rough surface inclined at an angle of theta above the ...
January 20, 2015

ascience
what is the velocity vector of a sailboat traveling east at 20 mph with a wind of 10. mph to the north
January 20, 2015

English
Is drawing considered a physical challenge
January 20, 2015

Math
how many times heavier is a 16 1/2 pound rock than a 10 1/2 pound rock?
January 20, 2015

Chemistry
Our blood works mostly as a carbonic acid buffer which has an optimal buffering pH of about 6.4, the pH of blood is around 7.4. What is the advantage for the body of having the buffer at the non-optimal pH??
January 20, 2015

physics
When a ball is thrown upward, it experiences a downward accelera- tion of magnitude 9.8 m/s 2 , neglecting air resistance. With what velocity must a ball leave a thrower’s hand in order to climb for 2.2 s before stopping?
January 20, 2015

English
I have to name some physical challenges. Would aiming be considered a physical challenge
January 20, 2015

physics
If a car crashes into a wall, the wall puts force on the car. The car puts an equal force on the wall. What does each force do?
January 20, 2015

math
Digital camera memory card is 1/4 full. Card is 2/3 full when 375 more pictures have been taken. How many pictures can memory card hold? How pictures were originally on memory card?
January 20, 2015

League of Nations
How did the US Congress feel about the League of Nations
January 20, 2015

Genetics
Chemical analysis of the DNA of a virus from Mars reveals that it has 48% A, 48% T, and 4% G, Suggest some possible structures for this DNA. I don't quite understand this question. All i can come to think about is that A pairs with T evenly because of the percentages, ...
January 20, 2015

economics
The _____ Plan, favored by _____ States, proposed giving States equal representation in a unicameral Congress.
January 20, 2015

Math
Is x(x+6)=0 the same as x = 0 and x + 6 = 0?
January 20, 2015

physics

January 20, 2015

jp
C=π*d d=diameter=2r r=radius 176=π*d divide both sides of the equation by π 176/π=d take that answer and divide it by 2 Hope this helped :)
January 20, 2015

Math
If it takes a tub 20 minutes to fill up when the water is on all the way and 15 minutes to drain, how long will it take for the tub to be completely drained when the water is left all the way on? In 1 hour the tub can fill up 3 times and the tub can drain 4 times. So will it ...
January 20, 2015

Math
Find the interval for b such thtat the equation has a t least one real solution. i. X^2+bx-6=0 ii. 2X^2+bx-7=0 iii. x^2+bx+3=0 iv. 3x^2+bx+5
January 19, 2015

Math
f(x)=x64-4x^2+k. Find the values of k so thath the zeros of f satisfy the specified charachteristics. a.four real zeros b.two real zeros, each of multiplicity of two c.two real zeros and two complex zeros d.four complez zeros a.I don't know if this range goes for this or b...
January 19, 2015

Math
In 8.061, what is the place value of 6?
January 19, 2015

Math
Solve for x? 1. Divide both sides by -2. This is done to isolate the variable -2x = -16 --- ---- -2 -2 x = 8 <-----
January 19, 2015

Math
please help
January 19, 2015

Math
tina, troy and nate had a total of 25 equal-sized square tiles to place over a square grid. Tina used 8/25 of the square tiles. Troy used 1/5 of the square tiles. what fraction of the square grid must Nate place the tiles on so that 1/5 of the square grid is not covered.
January 19, 2015

law
What kind of questions trigger the reading of the miranda rights? Is there a case that deals with this specific issue... whether the question asked by the police was part of an interrogation or just an informal question getting basic information? Do these ever overlap?
January 19, 2015

Math
johnny is jogging along a track. He has already jogged 1 2/3 miles. He plans to jog a total of 3/14 miles. How many miles does he have left to jog?
January 19, 2015

Math
a snail is at the bottom of a well. in the first 10 minutes, the snail climbs 23 7/12 inches. In the next 10 minutes, it climbs 19 5/6 inches. How far is the snail from the bottom of the well after 20 minutes?
January 19, 2015

Math
arnold buys 8/9 pound of ground turkey. He uses 3/4 pound of the ground turkey to make meatballs. How many pounds of ground turkey are left?
January 19, 2015

Math
please help
January 19, 2015

Math
steve picks 55 pounds of pears. He packs equal amount of pears into 6 bags. He then has 4 pounds of pears left. What is the weight of pears in each bag?
January 19, 2015

Math
jeremy puts an empty container under a leaking faucet. In the first hour, 3/8 quart of water collects. In the second hour, 1/6 quart of container of water collects. how much water collects in the container in the two hours?
January 19, 2015

Math
11*12=132
January 19, 2015

Math
Hillside Little League has 12 teams. Each team plays each of the other team twice. How many games are played?
January 19, 2015

Math
what would the graph look like for the equation f(x)=ax+b/cx+d when a>0, b<0, c>0, d<0?
January 19, 2015

algebra
What is the area of the largest rectangle with lower base on the x-axis and upper vertices on the curve y = 27 - x2
January 19, 2015

Math
how'd you get 1/20-1/15?
January 19, 2015

Math
How long will it take for the tub to completely empty with thte drain open and the water running at full speed? Given: it takes 20 minutes to fill the tub and 15 minutes to drain the tub when the water is on all the way, full speed.
January 19, 2015

Math
Write a rational function satisfying the following criteria. vertical Asymptote: x=-1, slant asymptote: y=x+2, zero of the function: x=3 I had f(x)=x^2+3x+2/x+1, that only works for the asymptotes and not the zero can someone please help me figure how to satisfy all three ...
January 19, 2015

math
integrate (Abs value(secx)^2/cscx)sinx dx
January 19, 2015

Chemistry
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 it to me. ...
January 19, 2015

calc
but with integration there is no power rule wouldn't I have to use substitution?
January 19, 2015

calc
integrate (3+x)x^(1/2)dx=? please help I have no idea how to integrate this problem
January 19, 2015

Please reply Dr. Bob
So the answer is that this will form a buffer?
January 19, 2015

Chemistry
Okay, thank you Dr. Bob. So just to confirm, it does not matter that the weak acid and its conjugate base are added in different amounts?
January 19, 2015

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

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