Friday

February 27, 2015

February 27, 2015

Total # Posts: 3,353

**chemistry**

If something originally contained 32.0 g of Po-210, which has a half-life of 10.5 minutes, and was now 73.5 minutes old, how many grams would be left?
*May 13, 2013*

**algebra.. HELP ME!!!**

101
*May 13, 2013*

**Polynomials**

Let f(x) be a polynomial such that f(f(x))−x^2 =xf(x). Find f(-100)
*May 13, 2013*

**Math**

1. What is the total sales tax to be paid in 2012 on the purchase of a 2012 passenger vehicle with a selling price of $17,000 and a $2,000 trade-in allowance?
*May 13, 2013*

**statistics**

A vending machine dispenses coffee into a twelve-ounce cup. The amount of coffee dispensed into the cup is normally distributed with a standard deviation of 0.07 ounce. You can allow the cup to overfill 2% of the time. What amount should you set as the mean amount of coffee to...
*May 12, 2013*

**statistics**

a basketball scout randomly selected 144 players and timed how longeach player took to perform a certain drill. The times in the sample were distributed with a mean of 8 mins. The population standard deviation was known to be 3 minutes. Using a 95% confidence interval, ...
*May 12, 2013*

**Algebra**

A car rental agency advertised renting s car for %26.95 per day and @0.34 per mile. If David rents this car for 4 days how many whole miles can he drive on a $150 budget?
*May 10, 2013*

**social studies**

thank you
*May 10, 2013*

**social studies**

what are some exploration thomas jefferson made, and thomas jefferson federal courts information
*May 10, 2013*

**Physicss**

a typical woman gives off heat at rate of about 8000 calories per hour. how long would a woman have to stay in a bath of 60L (60,000 g) of 26 C water in order to raise the water temperature to 30 c ? presume that all the heat given off by the woman is transferred to the water...
*May 9, 2013*

**Physics**

Donny can you tell us the formula for 1)f) B_0 please?
*May 8, 2013*

**Interest**

It’s time to go shopping! You grab your Best Purchase credit card, which has an annual interest rate of 18%. The unpaid balance on your card for the current billing cycle is $285.76. On your shopping trip, you purchase four items: a Blu-ray player, two 4-GB flash drives, ...
*May 7, 2013*

**math**

A manufacturer produces ceiling fans at a cost of $38.25 per fan. During the summer months, it sells the fan in one of its retail outlets at a selling price of $55.00. However, during the fall and winter seasons, the manufacturer discounts its fans by 20% off the $55.00 ...
*May 7, 2013*

**math**

1. Calculate the interest charge on a $5,000 balance with your current 16.5% annual interest rate. 2. Calculate the interest charge on a $5,000 balance with the Visa Student Card’s annual interest rate of 10.8%.
*May 7, 2013*

**health information**

I need to research the root cause of disease classification structure and how it is linked to the outcomes of both the reimbursement and the epidemiological data. how do I research these topics? Or can you explain these instructions better? I asked the instructor no response ...
*May 6, 2013*

**5th grade math**

3556. Hope this helped! :)
*May 6, 2013*

**Algebra**

What is the sum of all positive integers N<=1000 such that N equals 13 times the digit sum of N ?
*May 6, 2013*

**Math**

Alonzo plans to retire as soon as he has accumulated $250,000 through quarterly payments of $2,500. If Alonzo invests his money at 5.4% interest, compounded quarterly, when (to the nearest year) can he retire?
*May 6, 2013*

**physics**

In trying to lift a heavy stone into a moving truck, a worker utilizes rope, a rug, and two long planks of wood. Identify what forces are at work in making it too hard for the worker to just lift the stone up on his back.
*May 3, 2013*

**earth science**

Why do deciduous trees lose their leaves in the fall?
*May 3, 2013*

**science **

an object moving at a speed of 1m/s has a kinetic energy of 5 J what is its kinetic energy when it moves at 3m/s
*April 26, 2013*

**Math**

need more information!
*April 25, 2013*

**math**

simplify the expression 14/(3x)+(x+5)/(3x)
*April 24, 2013*

**Pre-Calculus**

Simplify arctan 1/3 + arctan 2/3(round to the nearest degree).
*April 24, 2013*

**Trig**

Thank you <3 you are a lifesaver!
*April 20, 2013*

**Trig**

Whoops I forgot to include the diagram...here it is: i.imgur [dot] com/RRY5pox.png
*April 20, 2013*

**Trig**

This has to do with vectors...I'm wondering if I set up the diagram correctly? A plane has a speed of 250mph and flies with a bearing of N35degE. The wind is blowing from the west at 25 mph with a heading of due east. What is the actual speed and heading of the plane?
*April 20, 2013*

**Trig**

This has to do with dot products (I can't make the arrow above the u, i, or j). Given u = 4i - 6j and v = -3i + 5j, find 4u-(1/2)v Am I just supposed to plug in what u and v are equal to in 4u-(1/2)v? If so, is the answer (35/2i - 53/2j)
*April 20, 2013*

**presential esential**

Explain why academic and professional research must use credible sources.
*April 20, 2013*

**presentation essential**

answer all my question
*April 18, 2013*

**presentation essential**

dentify and evaluate the three specific credible sources of information on that topic based on the information on evaluating sources in your textbook on pages 179 – 181. Identify and discuss the criteria that were used to evaluate those three sources and provide evidence ...
*April 18, 2013*

**Algebra**

I have four problems I'm having trouble with. I need to solve the equations by completing the square. 1) w^2 - 5w = 11/4 2) z^2 + 11z = -21/4 3) k^2 - 8k - 7 = 0 4) v^2 - 7v + 1 = 0
*April 17, 2013*

**math**

Usually you will be given the area of the irregular base. If so, it would be the area of the base x height.
*April 16, 2013*

**maths**

The basic formula for a rate/distance/time formula is rate x time = distance bomber: 500 k/hr x (t+2.5)hours = distance (t=time, and the bomber flew 2.5 hours longer than the fighter) fighter: 750 k/hr x t hours = distance Since the two distances are the same, the two ...
*April 16, 2013*

**Trig**

Using law of sines, this is what I got: x/sin37° = 100/sin10° x = 346.6 ft h/sin47° = 346.6/sin90° h = 253.5 ft Is this wrong...?
*April 16, 2013*

**Trig**

From a certain distance from the base of a Giant Sequoia tree a surveyor determines that the angle of elevation to the top of the tree is 47deg. The surveyor then walks 100 feet away from the tree and determines that the angle of elevation to the top of the tree is now 37deg. ...
*April 16, 2013*

**Calculus 1A**

The problem is: Verify the given linear approximation at a=0. Then determine the values of x for which the linear approximation in accurate to within 0.1. LN(1+x) ≈ x I found f(0) = 0 and f'(0) = 1 I have an equation: LN (1+x) -(.1) < x < LN(1+x) + 1 The answer...
*April 16, 2013*

**Math**

A rhombus is a square that has been somewhat flattened (look it up on the Internet). It has 4 equal sides, just like a square. If all of the sides added together equal 64, and if all four sides are equal to each other, what is 64 divided by four sides?
*April 16, 2013*

**U.S/history AP**

What is your question, exactly?
*April 16, 2013*

**parametric equations**

On what intervals of t is the curve described by the given parametric equation concave up? Concave down? x=t^2; y=t^(3)+3t
*April 16, 2013*

**Quantum Physics**

Problem 5 plz
*April 16, 2013*

**Calculus 1A**

I am so confused! The problem is: Verify the given linear approximation at a=0. Then determine the values of x for which the linear approximation in accurate to within 0.1. LN(1+x) ≈ x I found f(0) = 0 and f'(0) = 1 I have an equation: LN (1+x) -(.1) < x < LN(1...
*April 15, 2013*

**Finding the distance**

Find the distance d(P1,P2) between the points P1 and P2 P1=(-1,5);P2=(2,4) d(P1,P2)=
*April 15, 2013*

**Math**

I am not sure. That's what the questions says
*April 11, 2013*

**Math**

You bought an oil company stock for $83K per share. The price of the stock lost $16M during a six month period. Find the price of the stock at the end of the six months. How do I do this?
*April 11, 2013*

**Trig**

Solve the equation on 0° ≤ θ < 360° and express in degrees to two decimal places. sin(2θ) = -0.7843 I've gotten 308.345° (QIV) and 231.655° (QIII). I'm unsure how to get the answer though? The final answer is: 115.83°, 295.83°...
*April 8, 2013*

**Chem**

how do you find the molarity of NaOH if 23.64ml of its solution is needed to neutralize .5632g of KHC8H4O4?
*April 8, 2013*

**Science**

The following heats of formation are used to find the change in enthalpy for the formation of tin chloride in the following reaction Sn (s) + 2Cl2(g) --> SnCl4(l).Sn(s) + Cl2(g) --> Sn Cl2(l) DH = -186.2 kJSnCl2(s) + Cl2(g) --> SnCl4(l) DH = -325.1 kJWhat is the ...
*April 7, 2013*

**math - college algebra**

If the rational function y = r(x) has the vertical asymptote x = 9, then as x →9+, either y → ____or _____
*April 7, 2013*

**Quantum Physics**

5A i 0 0 -i 5b -i 0 0 i 5C -1 -1 -1 3a is 2nd option 3b is 2nd option 6C,6D,8C,8D please
*April 6, 2013*

**Quantum Physics**

6C,6D,8C,8D please..
*April 6, 2013*

**Algebra**

What is the correct factorization of x^2(x-8)+5(8-x)?
*April 4, 2013*

**Algebra**

Explain how to factor the difference of two squares.
*April 4, 2013*

**chemistry**

How much water must be added to 440. mL of 0.204 M HCl to produce a 0.139 M solution? (Assume that the volumes are additive.)
*April 4, 2013*

**Algebra**

A rock is dropped from a riverbank that is 4 feet above the surface of the river. After how many seconds does the rock hit the surface of the water? At highest?
*April 2, 2013*

**math**

Actually, the problem states that Jo has to read 1/2 of a 100 page book. It also asks what percent of the assignment is left. So: 38/50 x 100 = 76% read. 100 - 76 = 24% left to read.
*April 2, 2013*

**Physics**

What is the wavelength of a 512 Hz sound wave in 20 degree C air?
*April 2, 2013*

**Maths**

Suppose Z=a+bi , where a and b are integers and i is the imaginary unit. We are given that |1+iZ| = |1-iZ| and |Z-(13+15i)|<17 . Find the largest possible value of a+b
*April 2, 2013*

**Maths**

The vertices of a cube are labeled with the numbers 0,1,2,3,4,5,6 and 7, such that no two vertices are labeled with the same number. The sum of any 2 numbers on an edge is prime. What is the maximum sum of the 4 numbers on a face?
*April 2, 2013*

**Maths**

How many ordered sets of positive integer triples (a,b,c) are there such that a+b*c=100
*April 2, 2013*

**Algebra**

When factoring an equation, how do I know if the result is prime? For example, I have a problem x^2 - 2x + 4 and I think it is prime because I can't solve it. Am I right?
*April 1, 2013*

**Algebra**

I have several of these problems and am having trouble getting the hang of it. Can you help me? Factor. If the result is the square of a binomial, write it as such. If the result is prime, so state. Here are the first couple of problems. 1) x^2 + 7x + 12 2) x^2 - x - 12 3) x^2...
*April 1, 2013*

**math**

The total fencing around a square field is 80 yards. The field has an area of how many square yards?
*April 1, 2013*

**Chemistry**

I am trying to do the next one but I am still confused. Would the next one simply be HA+OH^- ----> H2O + A^- ?
*March 29, 2013*

**Chemistry**

You are given an assignment to make 250ml buffer solution having 0.25M weak acid and 0.2M of its conjugate base. You have stock solutions 1.5M acid and 0.5M of the conjugate base. Clearly explain how you are going to make this buffer solution. Can anyone please help me!!!
*March 29, 2013*

**algebra 10th grade**

Solve for x? 0 = -9/5 x -9
*March 28, 2013*

**math**

Write an inequality that represents the statement: x is less than 4 and greater than 1
*March 27, 2013*

**algebra**

6(15) + 40 = ?
*March 27, 2013*

**10 grade algebra**

please help with this problem Your dad is taking Biology as part of the veterinarian program at the local community college. This semester he will spend a total of 40 hours in the biology lab, and he will take notes in class 6 hours per week. Define a variable for the number ...
*March 27, 2013*

**algebra 10th grade**

Is it 90+40=130?
*March 26, 2013*

**algebra 10th grade**

solve the equation showing steps please 6(15)+40
*March 26, 2013*

**algebra 10th grade**

please help with this problem Your dad is taking Biology as part of the veterinarian program at the local community college. This semester he will spend a total of 40 hours in the biology lab, and he will take notes in class 6 hours per week. Define a variable for the number ...
*March 26, 2013*

**10 grade algebra**

Thanks Colin.
*March 26, 2013*

**10 grade algebra**

x=80
*March 26, 2013*

**10 grade algebra**

x=60?
*March 26, 2013*

**10 grade algebra**

solve 10(x+5)=130
*March 26, 2013*

**10 grade algebra**

Solve the equation 2(x =10)=80
*March 26, 2013*

**Calculus 1A**

thanks!!!!!!
*March 26, 2013*

**Calculus 1A**

I am trying to find: dy/dx for y = sec(tan x) I have the answer, but I have no idea how to get there. I know that the derivative of sec x = sec x tan x and that the derivative of tan x is sec^2 x. But sec doesn't have an x, so ...?
*March 26, 2013*

**Physics**

Which describes the greatest displacement? - walking 3 m east then 3 m north, then 3 m west - walking 3 m north, thrn 3 m west, then 3 m south
*March 24, 2013*

**Physics**

Aoron leaves one cify at noon. He has to be at another city 186 km away at 3:00 p.m, the speed limit the entire wAy is 65 km/h . Can he arrive At the second city on time? Explain
*March 24, 2013*

**Derivative**

I didn't realize I had to omit the y' and I got y(-2x + y)/ (y-x)^3
*March 21, 2013*

**Derivative**

Thank you!!!! i got it :)
*March 21, 2013*

**Derivative**

implicitly differentiate f(x) 2xy= y ^2 find second derivative with relevance to x and y. i get y''= -xy' - y/ (y-x)^2 this is wrong though. can someone please help me. thank you
*March 21, 2013*

**Algebra I?**

((x-3)/(x+1)) > 5 I get x < - 2 everytime I solve it, but apparently this is wrong. Can you please show me the steps? :/
*March 21, 2013*

**Derivative**

with respect to x f(cos x) if f'(x)= 1/x find (f(cos x))' i got tan x sec x this is wrong. please explain. thank you
*March 20, 2013*

**Chemistry**

A scuba diver takes a 2.3 balloon from the surface, where the pressure is 1.1 and the temperature is 28, to a depth of 35 , where the pressure is 4.5 and the temperature is 14.
*March 19, 2013*

**Chemistry**

Thanak you so much for your help, DrBob222
*March 19, 2013*

**Chemistry**

Oh, sorry. I meant to say that solution y has a 10 times higher OH- concentration compared to solution x. I hope it makes sense now. :-) Mary
*March 19, 2013*

**Chemistry**

Solution x has a pH of 4.35. Solution y has 10- times high [OH-] compared to solution x. Solution z has a pH 4.0 units higher than that of solution x. calculate the ration of [H3O+] between solutions x&y and between x&z. What is the pH of solutions y and z? classify each ...
*March 19, 2013*

**Math**

Find the HCF 1) 7x and 9 : nothing 2) x^2(x-4) and x(x-4) : its (x-4)? 3) 6b and 2b^3 : 2b ,? 4) 6(x-1)^2 and 16(x-7)(x-1) : x-1 , 5) 18y,27y, 9xy^2 : 9y 6) 5a^2 and 25a : 5a 7) 6abc, 8ab, 12bc : 2b 8) 9a^2b and 18ab^2 : 9ab
*March 19, 2013*

**English**

The team ______ won the game is my favorite. which word correctly completes the sentence above? a. which b.whom c. who d. that
*March 18, 2013*

**science**

in the digestive tract, mouth is bolus to a. stomach is to chyme b. gallbladder is to insulin c. small intestine is to carbohydrate d. esophagus is to peristalsis
*March 18, 2013*

**....**

hans uses a wheelchair. although he has a ramp to get in his house he finds it difficult to get his wheelchair up the ramp. which modification would make it easier for hans to get in his house? a. increase the length of the ram b. increase friction between the wheels and the ...
*March 18, 2013*

**....**

in the digestive tract, mouth is to bolus as a. stomach is to chyme b. gallbladder is to insulin c. small intestine is t carbohydrates d. esophagus is to peristalsis
*March 18, 2013*

**English**

hans uses a wheelchair. although he has a ramp to get in his house, he finds it difficult to get his wheelchair chair up the ramp. which modification would make it easier for hans to get in his house? a. increase the length of the ramp b. increase the friction between the ...
*March 18, 2013*

**HSC/514**

I have to choose a healthcare organization and discuss the accountability, internal and external factors I know how to do the assignment. I need to know how to find the names that would have the information available online. what would I google for?
*March 17, 2013*

**English**

The students felt fairly prepared for whatever tests their instructors might give them, after years of studying , however difficult the test might be which group of words is misplaced in the sentence above? a. however difficult they might be b. the students felt fairly ...
*March 17, 2013*

**science**

water freezes in the crack in this boulder and expands. over time, pieces of the boulder will break off. what type of weathering effectis this an example of? a. wedging b. hydration c. carbonation d.reduce pressure
*March 16, 2013*

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