Saturday

August 1, 2015

August 1, 2015

Total # Posts: 83,027

**calculus**

1.Solve the differential equation dy/dx= y^2/x^3 for y=f(x) with the condition y(1) = 1. 2.Solve the differential equation y prime equals the product of 2 times x and the square root of the quantity 1 minus y squared. Explain why the initial value problem y prime equals the ...
*April 28, 2015*

**English**

it mla
*April 28, 2015*

**Physics Help Please! Decay Questions**

archaeologist digging at the site of an ancient settlement discover the remains of a wooden structure. carbon 14 dating of the wood from the structure finds a decay rate of 180 decays/min. Knowing that the decay rate for living wood is 600 decays/min and the decay constant for...
*April 28, 2015*

**History Help! Very easy. **

How are the cultures in South America like the cultures in Mexico? How are they different? I already got the similarities. I need DIFFERENCES, and the Internet, full of approximately 150 websites I checked, has NO use.
*April 28, 2015*

**Calculus**

Piecewise function problem. Let f(x)={ax^2+1/3, x is greater than or equal to 1; bx-10/3, x<1. If the function is differentiable, find the sum of a+b.
*April 28, 2015*

**Math help**

How would I find the volume of a cube with edge lemgth of 3sqrt2 cm?
*April 28, 2015*

**Calculus**

I'm still confused to where to plug in 8200. Do i plug it into P=Ce^kh where C=101.3?
*April 28, 2015*

**Calculus**

The rate of change of atmospheric pressure P with respect to the altitude h is proportional to P provided that the temperature is consistent. At 15 degrees Celsius, the pressure is 101.3 pounds per square inch (psi) at sea level and 87.1 psi at height 1000m. Find the pressure ...
*April 28, 2015*

**Physics Help Please**

archaeologist digging at the site of an ancient settlement discover the remains of a wooden structure. carbon 14 dating of the wood from the structure finds a decay rate of 180 decays/min. Knowing that the decay rate for living wood is 600 decays/min and the decay constant for...
*April 28, 2015*

**Geometry **

How do I find the area of a regular triangle with a perimeter of 36 cm?
*April 28, 2015*

**Social studies**

Yup! D,A,C lol some people just WANT connections students to fail >.<
*April 28, 2015*

**Social studies**

The dude before me is right used his advice got 100 on test
*April 28, 2015*

**Algebra**

Spencer and Sydney both have many books at home. Together they have 65 books. Spencer has 9 fewer books than Sydney. How many books does Spencer have?
*April 28, 2015*

**Algebra**

Spencer and Sydney both have many books at home. Together they have 65 books. Spencer has 9 fewer books than Sydney.
*April 28, 2015*

**Physics **

Periodic waves spread out over the surface of a lake where two women, Jenna and Mel, are fishing in separate boats 97 meters apart. Each woman's boat bobs up and down 31/min. At a time when Jenna's boat is at a crest, Mel's boat is at its lowest point, and there ...
*April 28, 2015*

**physics**

A mass is attached to a vertical spring, which then goes into oscillation. At the high point of the oscillation, the spring is in the original unstretched equilibrium position it had before the mass was attached; the low point is 8.6cm below this. What is the period of ...
*April 28, 2015*

**Math **

Find area of the region under the curve y=9−2x2 and above the x-axis. area=?
*April 28, 2015*

**Health**

__________ supervision means you keep your children in your view when they are in or near water. A. Active**** B. Quiet C. Loud D. Adult
*April 28, 2015*

**physics**

A solid ball with a mass m = 0.53 kg floats in a tank of water. The ball is made of material with a density of 400 . The density of water is 1000 . What fraction of the volume of the ball is below the waterline?
*April 28, 2015*

**Chemistry**

In a basic solution how does the concentration of H3O+ compare to concentration of OH-?
*April 28, 2015*

**physics **

Vibrating a long spring with a succession of pulses with a frequency of 50hz produces adjecent nodes that are separated by 3.5cm. What is the velocity of the longitudinal waves formed?
*April 28, 2015*

**French**

We put napkins on the table. I want to use a form of the expression "mettre sur la table."
*April 28, 2015*

**French**

Is this sentence correct? On met sur la table des nappes.
*April 28, 2015*

**PHYSICS**

A tube is open only at one end. A certain harmonic produced by the tube has a frequency of 500 Hz. The next higher harmonic has a frequency of 611 Hz. The speed of sound in air is 343 m/s. (a) What is the integer n that describes the harmonic whose frequency is 500 Hz? (b) ...
*April 28, 2015*

**L.A. Please Help**

^ those are the correct answers
*April 28, 2015*

**L.A. Please Help**

those are all wrong..thanks for lowering my grade idiot..
*April 28, 2015*

**5th grade (math)**

Thank u v. Much!!!
*April 28, 2015*

**Math**

If 5 times a number n is subtracted from 15, the result is negative. Which of the following gives the possible value(s) for n? A. 0 only B. 3 only C. 10 only D. All n is greater than 3 E. All n is less than 3
*April 27, 2015*

**English**

In this sentence, f has to be omitted. Should f be italicized?
*April 27, 2015*

**English**

Should the first letter of these words be capitalized in this sentence or not? I'm quoting them from a poem, and they are not capitalized there. Should I add a comma before "diverged"? The words "diverged," "both," and "another day" ...
*April 27, 2015*

**Social Studies I NEED HELP PLEASE!!!**

So answer choice B is incorrect for 2? If so. I'm sorry.
*April 27, 2015*

**Social Studies I NEED HELP PLEASE!!!**

I was thinking 2 is B, because back in the day most of Eastern Europe was under Communist rule. Communism was a totalitarian state. But I maybe wrong on the answer choice.
*April 27, 2015*

**Math**

The temperature, t, in degrees Fahrenheit, in a certain town on a certain spring day satisfies the inequality | t - 24 | is less than or equal to 30. Which of the following temperatures, in degrees Fahrenheit, is NOT in this range? F. -10 G. -6 H. -5 J. 0 K. 54
*April 27, 2015*

**geometry**

50 / 2 = ?
*April 27, 2015*

**Organic chemistry**

Help with prediction products of a reaction! 4-phenylbutanoyl chloride + AlCl3 --> ? the molecular formula of the product is C10H10O, and I need to determine the product. I was thinking an acylium ion would form, and then the carbonyl carbon would form a bond with the ring ...
*April 27, 2015*

**Art**

I agree with goish. I got 100, too!
*April 27, 2015*

**Art**

#3 Is A.
*April 27, 2015*

**Algebra**

At Central High School, the sophomore class has 60 more students than the freshman class. The junior class has 50 fewer than twice the number of students in the freshman class. The senior class is three times as large as the freshman class. If there are a total of 1,424 ...
*April 27, 2015*

**PHYSICS**

How do I solve this? A satellite has a mass of 5949 kg and is in a circular orbit 4.07 × 105 m above the surface of a planet. The period of the orbit is 1.9 hours. The radius of the planet is 4.55 × 106 m. What would be the true weight of the satellite if it were ...
*April 27, 2015*

**World Geo, Help pls**

9 is Dutch.
*April 27, 2015*

**Accounting **

DeWeese Corporation issues $400,000 of 8%, 5-year bonds on January 1, 2015, at 105. Assuming that the straight-line method is used to amortize the premium, what is the total amount of interest expense for 2015?
*April 27, 2015*

**Civics**

thanks!
*April 27, 2015*

**Civics**

In which type of government would people elect officials to make government decisions? Monarchy Direct Democracy Representative Democracy*** Autocracy
*April 27, 2015*

**Math**

Solve the equations to the nearest tenth and use the given restrictions. 2. sin theta = -0.204, for 90 degs < theta < 270 degs Ans: 191.8 degs?
*April 27, 2015*

**Civics**

Thanks! can u help me with a couple more?
*April 27, 2015*

**Civics**

Then Autocracy, oligarchy, democracy ? I thought this 1st but double guessed my self.
*April 27, 2015*

**Civics**

Which order lists government types from the least power for the people to the most? Oligarchy, autocracy, republic Autocracy, oligarchy, democracy Democracy, unitary, parliamentary Federation, republic, unitary***
*April 27, 2015*

**maths**

Imagine that you have five blue socks and five brown socks in a drawer that are not paired up. How many socks must you take out from the drawer (without looking) to be sure of getting a pair of the same color?
*April 27, 2015*

**Accounting**

Louis Welch is general manager of United Salons. During 2014, Welch worked for the company all year at a $10,200 monthly salary. He also earned a year-end bonus equal to 10% of his annual salary. Welch’s federal income tax withheld during 2014 was $850 per month, plus $...
*April 27, 2015*

**Math**

rcsdk12 . org/cms/lib04/NY01001156/Centricity/Domain/5668/10.1%20Solid%20Geometry%20Classwork.pdf In question 4, is the first choice the answer?
*April 27, 2015*

**Math**

Solve the equations to the nearest tenth and use the given restrictions. 2. sin theta = -0.204, for 90 degs < theta < 270 degs Ans: 191.8 degs?
*April 27, 2015*

**Math**

Solve the equations to the nearest tenth and use the given restrictions. 1. tan theta = 8.055, for 90 degs < theta < 270 degs. Ans: 262.9 degs?
*April 27, 2015*

**Physics**

Ans. Force = (9x109) x q1 x q2/d2. Substituting into this inverse-square law we get Force = (9x109) (10-6)( 10-6)/(.03)2 = 10 Newtons.
*April 27, 2015*

**probability**

call from Example 1 that whenever Suzan sees a bag of marbles, she grabs a handful at random. She has seen a bag containing three red marbles, two green ones, four white ones, and two purple ones. She grabs eight of them. Find the probability of the following event, expressing...
*April 27, 2015*

**Math**

If sin 0 = -3 / 5 and pi < 0 < 3pi / 2, then tan 0 = ? F. -5 / 4 G. -3 / 4 H. -3 / 5 J. 3 / 4 K. 4 / 5
*April 27, 2015*

**Chemistry **

A 0.642 g sample of an unknown gas was collected over water at 25 C and 1.04 atm. The collection cylinder contained 151.3 mL of gas after the sample was released. Find the molar mass of the unknown gas?
*April 27, 2015*

**Chemistry **

Samples of NH3 and 02 are placed in a rigid container. When the equilibrium below is established, the partial pressure of H2O is 0.784 atm. What is the partial erasure of NO when the system is at equilibrium? 4NH3 + 5O2 -----> 4NO + 6H2O
*April 27, 2015*

**math**

Thank you
*April 27, 2015*

**Math**

Solve each equation to the nearest tenth and use the given restrictions. sin θ = -0.204 for 90 degrees < θ < 270 degrees. I don't get this. Is this supposed to be restricted to quadrants 2 and 3? Then it doesn't seem possible to get a value that will be...
*April 26, 2015*

**Math**

and the third one I would say 13:17 Like I explained above why I say 13 is tails.
*April 26, 2015*

**Math**

Wouldn't it be 17:13? To find heads to tails won't you need to subtract 30 - 17 because she tossed the coin 30 times, got HEADS 17 times, and there are only two things she could get, which is heads and tails.. So, 13 tails. That's what I would think 17:13. Does ...
*April 26, 2015*

**Math**

What do you think? heads to coin tosses. She tossed the coin 30 times and got 17 heads, so 17:30. It's 17:30 because it asks heads to coins. heads first, then coins. What do you think the second one is?
*April 26, 2015*

**p.e**

I mean is it A
*April 26, 2015*

**p.e**

Air pollutants can do all of the following except A. reduce your protection from the sun's radiation B. cause discoloration to your hair C. damage the respiratory system D. enter bloodstream and harm other parts of the body** Check pleaase
*April 26, 2015*

**math**

please help me with this one too! : if it costs about $0.10 per week to feed a snake, how much does it cost to feed 35 snakes for 4 wks?
*April 26, 2015*

**Math**

Ms.Sue, is my answer correct? $5,406,380?
*April 26, 2015*

**Math**

If it costs an average of $14 each day to feed each of the 1058 zoo animals, what is the annual cost for feeding all the animals?
*April 26, 2015*

**math**

She can
*April 26, 2015*

**chemistry **

What is the pH of a 0.2 M solution of pyridinium chloride (C5H5NHCl)? Kb for pyridine (C5H5N) is 1.5 × 10−9 . 1. 8.824 2. 2.788 3. 4.761 4. 3.068 5. 3.308 6. 2.698 7. 2.938 8. 5.176 9. 9.239
*April 26, 2015*

**chemistry **

Arrange the acids I) hydrogen selenate ion (HSeO− 4 ), pKa = 1.92; II) phosphoric acid (H3PO4), pKa = 2.12; III) selenous acid (H2SeO3), pKa = 2.46; IV) phosphorous acid (H3PO3), pKa1 = 2.00; in increasing order of strengths. 1. I, III, II, IV 2. None of these 3. I, III...
*April 26, 2015*

**chemistry **

Which of the following 0.10 M aqueous solutions gives the LOWEST pH? 1. CH3COOH (pKa = 4.75) 2. CCl3COOH (pKa = 0.52) 3. HF (pKa = 3.45) 4. H3PO4 (pKa1 = 2.12) 5. Because all are acids, the pH is the same for all solutions
*April 26, 2015*

**math**

true
*April 26, 2015*

**math**

If the length of each dimension of the rectangular prism is cut in half, then surface area will be 1/4 of the original surface area. true or false
*April 26, 2015*

**PHYSICS**

A satellite has a mass of 5949 kg and is in a circular orbit 4.07 × 105 m above the surface of a planet. The period of the orbit is 1.9 hours. The radius of the planet is 4.55 × 106 m. What would be the true weight of the satellite if it were at rest on the planet...
*April 26, 2015*

**Math**

write the equation y+3=1/3x in general form.
*April 26, 2015*

**physics**

A charge of -3.00 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass (radius = 0.115 m). The charges on the circle are -4.70 µC at the position due north and +5.00 µC at the position due east. What is the ...
*April 26, 2015*

**physics**

A charge of +3.7 ✕ 10-5 C is located at a place where there is an electric field that points due east and has a magnitude of 16400 N/C. What are the magnitude and direction of the force acting on the charge?
*April 26, 2015*

**physics**

The force of repulsion that two like charges exert on each other is 3.2 N. What will the force be if the distance between the charges is increased to 4 times its original value?
*April 26, 2015*

**physics**

A charge of -3.00 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass (radius = 0.115 m). The charges on the circle are -4.70 µC at the position due north and +5.00 µC at the position due east. What is the ...
*April 26, 2015*

**physics**

Consider three identical metal spheres, A, B, and C. Sphere A carries a charge of -6q. Sphere B carries a charge of -5q. Sphere C carries no net charge. Spheres A and B are touched together and then separated. Sphere C is then touched to sphere A and separated from it. Lastly...
*April 26, 2015*

**calculus**

Given the relationship 2x^2 + y^3 =10, with y > 0 and dy/dt = 3 units/min., find the value of dx/ dt at the instant x = 1 unit.
*April 26, 2015*

**calculus**

Given the relationship 2x^2 + y^3 =10, with y > 0 and dy, dt = 3 units/min., find the value of dx, dt at the instant x = 1 unit.
*April 26, 2015*

**Physics**

An observer stands 25 m behind a marksman practicing at a rifle range. The marksman fires the rifle horizontally, the speed of the bullets is 840 m/s, and the air temperature is 20 °C. How far does each bullet travel before the observer hears the report of the rifle? ...
*April 26, 2015*

**PHYSICS**

By accident, a large plate is dropped and breaks into three pieces. The pieces fly apart parallel to the floor. As the plate falls, its momentum has only a vertical component, and no component parallel to the floor. After the collision, the component of the total momentum ...
*April 26, 2015*

**Calculus**

Find the average value of f(x) on the interval [-1, 3] when f'(x)=3x^2-6x and f(2)=0.
*April 26, 2015*

**PHYSICS**

at the top, normal force=mg-v^2/r at the bottom, normalforce=mg+v^2/r
*April 26, 2015*

**chemistry**

Thank You
*April 26, 2015*

**PHYSICS**

the vector sum of the initial momentums is equal to the final vector momenmtum MaVaE+MbVbN=(Ma+Mb)V well, let Ma' be Ma/(Ma+Mb) and Mb' be Mb/(Ma+Mb) V=Ma'*VaE+Mb'*VbN magnitude.. V^2=(Ma'Va)^2+(Mb'*Vb)^2 direction (degrees N of E) Theta=arctan((Mb'...
*April 26, 2015*

**Calculus**

Nevermind. I got it
*April 26, 2015*

**Calculus**

How do I solve it without L'Hospital's Rule?
*April 26, 2015*

**Calculus**

Find limit as x approaches 0 [7x/(sqrt(x+4)-2)]
*April 26, 2015*

**Physics**

25.4
*April 26, 2015*

**Chemistry 2**

Does the reaction P4(s, white) + 5 O2(g) P4O10(s) occur spontaneously at 298 K and standard state conditions? Calculate the value of capital delta S°univ. Honestly do not know where to start.
*April 26, 2015*

**Kinetic energy**

steel ball of mass 0.310 kg is fastened to a cord that is 86.0 cm long and fixed at the far end. The ball is then released when the cord is horizontal, as shown in the figure. At the bottom of its path, the ball strikes a 3.10 kg steel block initially at rest on a ...
*April 26, 2015*

**Calculus**

Find the area bounded by y=x^2-4x+3 and y=x+4 to the newrest integer.
*April 26, 2015*

**Physics**

skeet
*April 25, 2015*

**Physics**

In an empty rubber raft the pressure is approximately constant. You push on a large air pump that pushes 1.0 L(1.0× 10^−3m3) of air into the raft. You exert a 17N force while pushing the pump handle 3.0×10^−2m . Determine the work done on the gas. If ...
*April 25, 2015*

**Calculus**

Negative infinity? Or 27/2?
*April 25, 2015*

**Calculus**

Given f(x)=x^2-27x-28, find the largest integer in shich f is decreasing.
*April 25, 2015*