Sunday

April 26, 2015

April 26, 2015

Total # Posts: 242

**Chemistry**

Suppose you are assigned to prepare a buffer of 0.10M HNO2 (Ka=1.7 x 10^-4) and 0.10M NaNO2 by mixing equal volumes of both solutions. What is the pH of the resultant solution? How would I first start this question? I have no clue what the steps are to be frank.
*April 15, 2015*

**math**

How many 50 centimeter pieces of ribbon can Casey cut from a roll of 60 meters long?
*March 18, 2015*

**Calculus 2 Trigonometric Substitution**

I'm working this problem: ∫ [1-tan^2 (x)] / [sec^2 (x)] dx ∫(1/secx)-[(sin^2x/cos^2x)/(1/cosx) ∫cosx-sinx(sinx/cosx) ∫cosx-∫sin^2(x)/cosx sinx-∫(1-cos^2(x))/cosx sinx-∫(1/cosx)-cosx sinx-∫secx-∫cosx sinx-sinx-∫...
*March 15, 2015*

**Calc**

∫ (2x+1)/(x+1) dx Please show steps if you work it. I think it's a partial fraction and worked with decomposition. Not sure though.
*March 14, 2015*

**Calculus 2**

I got the first two, but I'm unsure with the last one. I got the answer to be -ln |secxtanx|+C Here's what I did: ∫ [1-tan^2 (x)] / [sec^2 (x)] dx ∫(1/secx)-[(sin^2x/cos^2x)/(1/cosx) ∫cosx-sinx(sinx/cosx) ∫cosx-∫sin^2(x)/cosx sinx-∫(...
*March 14, 2015*

**Calculus 2**

∫ tan^2 (x) sec^4 (x) dx ∫ [tan^2 (t) + tan^4 (t)] dt ∫ [1-tan^2 (x)] / [sec^2 (x)] dx Trigonometric integral Please show steps so I can understand!
*March 14, 2015*

**Math**

The table shows the actual retail market share of passenger cards from Ford Motor Company as a percentage of the U.S. market. Year Market Share 1975 23.6% 1980 17.2% 1985 18.8% 1990 20.0% 1995 20.7% A mathematical model for this date is given by f(x) = 0.04x^2 - 0.8x + 22 ...
*February 10, 2015*

**psychology**

In general, the approach to stress embraced by psychoneuroimmunologists focuses on
*December 14, 2014*

**ps316**

There 112 seats there 7 seats in each row and 70 people are seated how many rows are empty
*November 30, 2014*

**physics**

What physics is involved for a passenger feeling pushed backward into the seat of an airplane when it accelerates along the runway during takeoff?
*September 16, 2014*

**algebra**

Write a formula to express the following sentence as an equation: The sale price us 25% off the original price. Use S for sale price and P for original price to express S as a function of P.
*August 31, 2014*

**math problem solving**

yes it is. thanks
*August 28, 2014*

**math problem solving**

the digit 5 occurs two times in the population of fairbanks. what is the value of each 5? explain your answer fairbanks- 35,252
*August 28, 2014*

**Biology**

Suppose that a repressor regulated the expression of the galA gene. Which of the parenthesis would be correct? (((supposing hypothetical bacterium gene: "galA" – encodes an enzyme that is required for cells to digest the sugar galactose/and/ "argB" &#...
*August 9, 2014*

**English**

The astronauts who were selected for this mission had to be in superb physical condition. Is sentence a essential or nonessential?
*April 30, 2014*

**math**

1/32 1/12 times 6/16 equals to 1/12 times 3/8 which equals to 1/32
*April 3, 2014*

**Finite Math**

:
Four cards are drawn without replacement from a well shuffled standard deck of cards. Let X be the number of aces drawn. 12. What are the possible values of the random variable X? Write them in increasing order as a set using roster (or list) notation. 13. Sketch a ...
*December 14, 2013*

**Journalism **

Please im begging you were going to submit the last articles tomorrow, help me make a feature article ... the topic is about unity for what happened in the philippines, the super typhoon yolanda please pleasple please
*December 12, 2013*

**statistics**

Playing game of chance and pay 300 by rolling a fair die one time if you rome a 2 and receive $1300 if you roll a 4 or six you receive $900 if you ore a 3 5 or 9 receive nothing. find expected value for this game. based on value is it a good game to play?
*July 13, 2013*

**statistics**

participant on tv show picke from lage # applicants with equal number of men and woman .amongst the last 9 participant 7 have been women . if they are picked randomly what is the probability of geting 7 more women when 9 people are picked
*July 13, 2013*

**statistics**

Test consist of 10 multiple choice questions each having 4 possible answers one being correct. you guessed all 10 what is the probability of getting less than 30%
*July 13, 2013*

**statistics**

Miller (2008) examined the energy drink consumption of college undergraduates and found that males use energy drinks significantly more often than females. To further investigate this phenomenon, suppose a researcher selects a random sample of n=36 male undergraduates and a ...
*July 10, 2013*

**statistic of behavioral science**

for each of the following, identify the exam score that should lead to the better grade. In each case, explain your answer. A score of x=56, on an exam with the mean =50 and the standard deviation of 4; or a score of x=60 on an exam with the mean=50 and the standard deviation =20
*June 22, 2013*

**Chemistry 12**

When 1.00 g. of MgCO3 is added to 2.0 L of water, some, but not all, will dissolve to form a saturated solution. Calculate the mass of solid that remains undissolved.
*April 4, 2013*

**chemistry**

12g/molC / 44g/molCO2 = x / 1.039g CO2 12/44 (1.039) = 0.2834 g C 2g/mol H2 / 18g/molH2O = x / 0.6369gH2O 2/18 (0.6369) = 0.071 g H 0.5438 - 0.2834 - 0.071 = 0.1939 g O 0.2824gC/12g/molC = 0.0236 mol C 0.071gH / 1g/molH = 0.071 mol H 0.1939gO/16g/molO = 0.0121 mol O Divide ...
*February 21, 2013*

**math**

how do you do the steps for this problem find two exact values for sin(cos^-1 sqrt5/6)
*February 4, 2013*

**Math**

3a+4b=-25 2a-3b=6
*February 4, 2013*

**algebra**

Use factoring and the zero-product property to solve the following problems. 1. z(z-1)(z+3)=0 2. x^2-x-10=2 3. 4a^2-11a+6=0
*November 28, 2012*

**Pschology**

A developing field in psychology is called Positive Psychology. It is exploring ways to help people become happier and productive in life. Describe the field of positive psychology and provide your critique of this particular field. What does the research suggest on the value ...
*November 20, 2012*

**trig**

A ship is headed due north at a constant 20 miles per hour. Because of the ocean current, the true course of the ship is 15°. If the currents are a constant 18 miles per hour, in what direction are the currents running? (Enter your answers as a comma-separated list. Round ...
*November 16, 2012*

**trig**

A 52-foot wire running from the top of a tent pole to the ground makes an angle of 57° with the ground. If the length of the tent pole is 44 feet, how far is it from the bottom of the tent pole to the point where the wire is fastened to the ground? (The tent pole is not ...
*November 16, 2012*

**trig**

Find all solutions to the following triangle. (Round your answers for angles A, C, A', and C' to the nearest whole number. Round your answers for sides c and c' to two decimal places. If either triangle is not possible, enter NONE in each corresponding answer blank...
*November 16, 2012*

**trig**

Find all solutions to the following triangle. (Round your answers for angles A, C, A', and C' to the nearest minute. Round your answers for sides a and a' to two decimal places. If either triangle is not possible, enter NONE in each corresponding answer blank.) B...
*November 16, 2012*

**trig**

Find all solutions to the following triangle. (Round your answers for angles A, B, A', and B' to the nearest minute. Round your answers for sides a and a' to the nearest whole number. If either triangle is not possible, enter NONE in each corresponding answer blank...
*November 16, 2012*

**trig**

Find all solutions to the following triangle. (Round your answers to one decimal place. If either triangle is not possible, enter NONE in each corresponding answer blank.) A = 115.2¡ã, a = 43.6 cm, b = 23.1 cm First triangle (assume B ¡Ü 90¡&...
*November 16, 2012*

**trig**

Given BC = 53 cm, BD = 62 cm, CD = 80 cm, ABC = 53°, and ACB = 66°, find the following. (Round your answers to the nearest whole number.) (a) the length of the chainstay, AC AC = cm (b) BCD BCD = °
*November 16, 2012*

**trig**

A barge is pulled by two tugboats. The first tugboat is traveling at a speed of 16 knots with heading 135°, and the second tugboat is traveling at a speed of 15 knots with heading 195°. Find the resulting speed and direction of the barge. (Round your answers to the ...
*November 16, 2012*

**trig**

A plane has an airspeed of 190 miles per hour and a heading of 24.0°. The ground speed of the plane is 214 miles per hour, and its true course is in the direction of 40.0°. Find the speed and direction of the air currents, assuming they are constants. (Round your ...
*November 16, 2012*

**trig**

A plane is flying with an airspeed of 150 miles per hour and heading 155°. The wind currents are running at 25 miles per hour at 160° clockwise from due north. Use vectors to find the true course and ground speed of the plane.
*November 16, 2012*

**English**

Her responsibilities include assisting other tasks as required / assisting with other tasks as required Which one is correct?
*October 30, 2012*

**UMD**

A solution of H2SO4(aq) with a molal concentration of 3.22 m has a density of 1.183 g/mL. What is the molar concentration of this solution?
*September 30, 2012*

**Physics**

A jet plane lands with a velocity of 100 m/s and can accelerate at a maximum rate of -5.0 m/s2 as it come to rest. Can this plane land at an airport where the runway is 0.80 km long?
*August 26, 2012*

**geometry**

find th measure of DAEB for MDBEC = 127 DEGREES
*July 21, 2012*

**english**

please write a paragraph to show you comprehend what analogies and idoms are. use at least one analogy and one idom in the paragraph
*July 19, 2012*

**Psychology**

How would the researcher randomly select files? (What does the process look like?)
*July 17, 2012*

**Art 101 Art Appreciation**

CAN YOU HELP WIYH THE RESEARCH ON THIS PAPER I DO NOT HAVE MY BOOK
*July 12, 2012*

**geometry**

GRG
*July 1, 2012*

**Finance**

The target capital structure for QM Industries is 38% common stock, 5% preferred stock, and 57% debt. If the cost of common equity for the firm is 17.7%, the cost of preferred stock is 10.4%, the before-tax cost of debt is 7.8%, and the firm's tax rate is 35%, what is QM&#...
*June 29, 2012*

**chemistry**

consider the reaction between copper metal and chlorine gas producing solid copper(1) chloride. when 16.2g of copper is reacted in an excess of chlorine, how many grams of copper(1) chloride will be produced
*April 28, 2012*

**chemistry**

In reverse osmosis, water flows out of a salt solution until the osmotic pressure of the solution equals the applied pressure. If a pressure of 47.0 bar is applied to seawater, what will be the final concentration of the seawater at 20 °C when reverse osmosis stops? Mc=? ...
*February 19, 2012*

**Physical Geography**

38 degrees celcius is what degree F?
*February 13, 2012*

**Math**

A juice concentrate containing 65% solids is added to a single-strength juice solution(containing 15% solid), in order to generate a final product which contains 45% solids. Calculate the amounts required for the concentrate and for the single strength solution to produce ...
*February 7, 2012*

**leadership**

total points of the semester you can earn 170 but i scored 140 what is my grade
*February 1, 2012*

**Engineering/Chemistry**

Milk is flowing through a heat exchanger at a rate of 2000kg/h. he heat exchanger supplies 111,600kJ/h. The outlet temperature of the product is 95C. Determine the inlet temperature of the milk. The product specific heat is 3.9kJ/(kg*C)
*January 31, 2012*

**Chemistry**

12312
*January 24, 2012*

**geometry**

22. If I drink orange juice, then I am healthy.
*November 6, 2011*

**statistics**

If 86% of households have cable television and three households are picked at random, what is the probability that at least one of those three picked will have cable television?
*September 25, 2011*

**Math**

Thank you!
*August 19, 2011*

**Math**

Determine the solution set of the system. x^2+y^2=9 x+y=3 Very confused on this one! PLease Help!
*August 19, 2011*

**Math**

Write the standard form of the equation for the circle that passes through the points (2, 6), (-4, 6), and (-4, -2). Then identify the center and radius. So far I got 2D+6E+F+40 -4D+6E+F+52 -4D-2E+F-20 IS this correct> and how do I solve it?
*August 19, 2011*

**english**

what is correct barb-and i or barb and me
*August 17, 2011*

**Programming Concepts**

how do you Create a Web page that displays all numbers from 20 to 1 and indicates whether the number is prime in it displays?
*July 25, 2011*

**Physics**

Ohh my bad sorry
*June 24, 2011*

**Physics**

Wait how is this physics??
*June 24, 2011*

**Physics**

If one used a stiff vertical spring rather than a regular one what would be the results? The gravitational PE and the Elastic PE would decrease. Am i right?
*June 24, 2011*

**Physics**

What would the gravitation PE and Elastic PE be like on the moon?
*June 24, 2011*

**Biochemistry**

When you dilute something you are just spreading it out more
*June 24, 2011*

**Biochemistry**

When something is diluted you change both the concentrations of acid and base but the ratio is still the same
*June 24, 2011*

**MEDICAL **

Just send more people to med school and then have an oversupply of doctors ;D
*June 23, 2011*

**Physics**

Thanks guys info really helped!
*June 23, 2011*

**Physics**

So my results are incorrect right? The PE should not be 0 when compressed.
*June 23, 2011*

**Physics**

So I did in an experiment and the results I got were the potential energy when the spring compresses is 0 and when it stretches is 1.42. This spring is vertical and has a 250 gram weight attached to it. I was very confused when i got these results because I thought the ...
*June 23, 2011*

**PLEASSEE HELP!**

Anyone!!
*June 23, 2011*

**Physics**

Im sorry i meant it has a 250 g weight
*June 23, 2011*

**Physics**

So I did in an experiment and the results I got were the potential energy when the spring compresses is 0 and when it stretches is 1.42. This spring is vertical and has a 250 gram spring attached to it. I was very confused when i got these results because I thought the ...
*June 23, 2011*

**Physics**

okay thanks
*June 23, 2011*

**Physics**

okay so the mechanical energy is AlWAYS constant?
*June 23, 2011*

**Physics**

How will mechanical energy affect different points of oscillation on a vertical spring? Well i know that mechanical energy is PE and KE...So when the spring is compressed the mechanical energy will equal the PE and when extended or stretched it will equal KE. Does that answer ...
*June 23, 2011*

**Physics**

A CAR HAS A MASS OF 1200KG TRAVELLING ON A LEVEL ROAD. THE CAR DECELERATED AT A RATE OF 10M/S^2 TILL THE CAR STOPPED. iT HAS TO OVERCOME A TOTAL RESISTANCE OF 400N WHILE BRAKING. (I) CALCULATE THE BRAKING FORCE OF THE CAR (II) WHAT WAS THE DRIVING OF CAR OF THE CAR?
*June 17, 2011*

**math**

What is the interest owed if the principle is 56,950. at 11 4/5 % interest for 155 days, using the 365 day calendar?
*June 14, 2011*

**Physics**

Hot air rises and cold air sinks. So in which condition will a switch of a fan heater be open or close ? Thanks (:
*June 10, 2011*

**PhysicS**

Physics, sorry and thanks !
*June 6, 2011*

**Physic**

Fan -- 15W Heating elements -- 1.2kW Mains -- 240 A) calculate the weekly cost of having the fan heater with the warm air setting on for 3hours each day. Assume that the cost of electricity is 0.25 cents per kWh.
*June 6, 2011*

**Physic**

These three are connected to 240V main supply : Grill = 6A Desk lamp = 0.6A Convector heater = 4.5 a(ii) which of these has the greatest resistance ? Explain how you can tell. (ii) calculate the resistance of the grill (iii) calculate the power rating of the convector heater (...
*June 4, 2011*

**Physic**

what happens to the force (magnitude and direction) on the wire when (i) the size of the current through the wire is increased ? (ii) A weaker magnet is used ? (iii) the size of the current the same but the direction of the current is reversed
*June 4, 2011*

**Geography**

You want to eventually own a ranch of several thousand acres and raise 20,000 head of cattle. You are considering establishing the ranch in Haiti. Would you likely be able to buy enough land for your ranch? Explain your answer.
*May 4, 2011*

**Science**

Compare an astronauts weight in orbit with the astronauts weight on Earth, assuming the mass of the astronaut doesn't change.
*March 28, 2011*

**Science**

Compare an astronauts weight in orbit with the astronauts weight on Earth, assuming the mass of the astronaut doesn't change.
*March 28, 2011*

**math**

Suppose that 25% of all wise people are nice and half of all the nice people are wise. Suppose further that 25% of all the people are neither wise nor nice. What percent of all the people are both wise and nice?
*March 16, 2011*

**math**

Find the values of c so that the intersection of y=-x+6 and y=x/3+c lies strictly in the first quadrant (not on a coordinate axis).
*March 13, 2011*

**math**

Find the value (in lowest terms) of the following product: (1-1/2^2)(1-1/3^2)(1-1/4^2),...,(1-1/2011^2).
*March 6, 2011*

**Chemistry - help needed**

In titrations involving sodium thiosulphate and potassium iodide, is it necessary to use starch solution to help us see the end point? If the colour change from yellow to colourless is easily visible, is it acceptable not to use the starch solution?
*February 22, 2011*

**algebra**

he walked 4.5 miles
*February 16, 2011*

**5th Grade Math**

There are about 3,400 species of frogs and toads, and scientists tell us that they represent 90% of the amphibians in the world. Using this information, what is total number of amphibians scientists believe are in the world. (Round your answer to the nearest 100.)
*February 10, 2011*

**math**

The area of a rectangular swimming pool is given by 3x^2+11x+6 ft^2.One side length of the pool is given by 3x+2 feet. what is an algebriac expression for the other side length of the pool? simplify and include correct units
*February 6, 2011*

**algebra**

A gardner wants to create a rectangular garden with length of 2x-8y ft. and with of 3x-4y ft. What is an algebriac expression for the area of the garden? multiply this out, express in simpliest mathematical form, include units
*February 3, 2011*

**math **

Consider that the age,x,of a unicorn in human equivalent years can be given by the formula f(x)= -0.002718x^4+0.097326x^3-1.3367x^2+12.46x+3.914. When a unicorn is 2.5 years old, what is its age in human eqivalent years? What about when it is 12 years old?
*February 2, 2011*

**algebra**

solve the system of equations 2r+2s = 50 and 2r-s=17
*January 20, 2011*

**Chemistry**

A procedure states "use iron(III)chloride hexahydrate". Can I use anhydrous iron(III) chloride instead if the hexahydrate is not available?
*January 19, 2011*

**Chemistry**

A procedure states "use iron(III)chloride hexahydrate". Can I use anhydrous iron(III) chloride instead if the hexahydrate is not available?
*January 18, 2011*