# Posts by Anonymous

Total # Posts: 107,891

**English**

What's Karen doing over there. She is supposed to be studying, but it looks like she is playing Andrew's game.

**Algebra**

The answer is 1.8816 * 10^25

**Algebra**

Astronomers measure large distances in light-years. One light-year is the distance that light can travel in one year, or approximately 5.88*10^12 miles. Suppose a star is 3.2*10^12 light-years from Earth. In scientific notation, approximately how many miles is it? a) 1.88 * 10...

**physics**

2. What value did you calculate for the index of refraction of the glass block in Part 2? How does your value compare to the accepted value of 1.53? Calculate the percentage error. Different materials have distinct indexes of refraction. Explain how you might identify a ...

**World history**

Thanks Ms.Sue

**World history**

Am i right?

**World history**

Wait i think the answer is C

**World history**

I think its A

**World history**

Need help ASAP What was one result of Hitlers invasion of the soviet union. A: Germany gained access to soviet factory's and farms. B: Stalin fled to the soviet union. C: Germany was able to take control of Leningrad. D: Churchill and Stalin became allies

**Social studies **

The spread of Christian ideas

**College Algebra**

a farmer has 500 feet of fence with which to fence a rectangular plot of land. The plot lies along a river so that only three sides need to be fenced. Estimate the largest area that can be fenc

**Social Studies Please help**

That's probably correct. It's certainly the best answer of the four. PS -- Do not comment on other students' posts, please.

**Calculus**

The data is for weekly sales in the dry goods department at a Wal*Mart store in the Northeast. Peak values, I.e. spikes, usually occur at holiday periods. Week 1 is the first week of February 2003. To show continuity, week 1 of 2004 is represented as week 53 since week 53 ...

**Calculus**

Week Sales in $ 41 18000 42 16800 43 15200 44 15000 45 13600 46 16000 47 12600 48 14800 49 16800 50 14800 51 15200 52 16000 53 15600 54 15600 55 15000 56 15700 57 15800 58 13800 59 12800 60 14400 61 15800 62 16000 63 12400 64 16200 65 17000 66 18600 67 16000 68 18000 69 19600 ...

**Calculus**

1. Can you identify holiday periods or special events that cause the spikes in the data? 2. What holiday results in the maximum sales for this department? 3. a) Generate linear and quadratic models for this data. b) What is the marginal sales for this department using each ...

**Social studies**

The answers are A D A B

**Math - Calc**

If f(x)=?[1,x^2] t^t dt find f'(x). Another problem similar to this one on my assignment was f(x)=?[1,x] t^t dt, and the answer was f'(x)=x^x. That same pattern would say this answer should be (x^2)^(x^2), but that's not being accepted. What am I missing here? ...

**Calculus - Definite Integrals Please Help!**

h(x)=?[-3,sin(x)] (cos(t^3)+t) dt

**Calculus**

The system I'm using says that's wrong What's the process? I don't know how to find the derivative of an integral like this

**Calculus**

Edit: the upper limit is actually x^2. Please help!

**Calculus**

find f'(x)= f(x)=?[1,x] t^t dt

**Calculus**

The velocity function is v(t)=t^2?5t+4 for a particle moving along a line. Find the displacement and the distance traveled by the particle during the time interval [-1,5]. So I found the antiderivative of the function, which gave me t^3/3-5^2/2+4x+c. Then plugging in the given...

**Math**

Penelope's cookie recipe calls for 3/4 of a pound of butter. If she only wants to make 1/2 of the recipe, how many pounds of butter should she use? Show your work.

**Social Studies And Business**

C B+C B A B C B A B+C A

**Vgemistry**

What is the oxidation number of sulphur in CuSO4.5H2O?

**Calculus**

If f(x)=?[3,x]t^5dt, then f'(x)= f'(-3)=

**English**

A reliable source can it be an editorial or documentary? Confused, because if you can prove they are reliable both could be correct. Any thoughts?

**physics**

What is the difference between a step-up and a step-down transformer? Give examples where each would be used.

**physics**

The hood ornament of Abe's car is shaped like a ring 0.06m in diameter. Abe is driving toward the west so that the earth's 5.0x10^-5 T field provides no flux through the hood ornament. What is the induced voltage in the metal ring as Abe turns from this street onto one...

**Trig**

Find all solutions of the equation in the interval [0,2pi) 2 cos^2 x-cos x = 0 -2cos^2 + cosx + 0 (x+1/2) (x+0/2) (2x+1) (x+0) -1/2,0 2Pi/3, 4pi/3, pi/2, 3pi/2 my teacher circled pi/2 and 3pi/2 What did I do wrong? I don't understand...

**Chemistry**

CaCO3 => CaO + CO2 (Common Decomp Rxn) 1:1 rxn ratio Ca. moles of CO2 from 49.7g CaCO3 then use Ideal Gas Law to Ca. Vol. CO2. Moles CaCO3 = (49.7g/100g/mole)= 0.497 mole CaCO3 => 0.497 mole CO2. From PV = nRT => V = nRT/P n = 0.497 mole R = 0.08206 L-Atm/mol-K T = ...

**Geometry**

I got 5, 5, 23,and 23

**Geometry**

The point of intersection of the diagonals of a rectangle is 4 cm further away from the smaller side than from the larger side of the rectangle. The perimeter of the rectangle is equal to 56 cm. Find the lengths of the sides of the rectangle.

**geometry**

The bisector of one of the angles of a rectangle also bisects a side of the rectangle. Find the perimeter of the rectangle if you know that the smaller side of the rectangle is equal to 10 cm. I need the perimeter in cm please

**math**

In a rhombus ABCD, m?A = 31°. Point O is a point of intersection of diagonals. Find the measures of the angles of triangle ?BOC. I got 15.5 degrees for angle OCB and thats right all I need is the angles for OBC and BOC

**Math**

A car used 8 gallons of gas to travel 340 miles a mechanic fixed the car. Then it used 7 gallons of gas to travel 350 miles. Gas cost $4.00 per gallon. How much less to the nearest cent per mile did it cost to run the car after mechanic fixed it

**science**

If you had a real thermometer that was accurate, how could you modify your experimental thermometer to read actual temperatures?

**Math**

You are correct.

**math**

the average stone on the lowest level of the great pyramids was a rectangular prism 5 feet long by 5 feet high by 6 feet deep and weighed 15 tons. what was the volume of the average stone

**physics**

A step-up transformer has 40 turns on its primary and 100 turns on its secondary. When the primary is supplied with an alternating current at 140 V, what is the voltage across the secondary?

**physics**

Dean is hunting in the Northwest Territory at a location where the earth's magnetic field is 8.0x 10^-5 T. He shoots at a duck decoy by mistake, and the rubber bullet he is using acquires a charge of 3.0 x 10 ^ -12 C as it leaves his gun at 300m/s, perpendicular to the ...

**physics**

The hood ornament of Abe's car is shaped like a ring 0.06m in diameter. Abe is driving toward the west so that the earth's 5.0x10^-5 T field provides no flux through the hood ornament. What is the induced voltage in the metal ring as Abe turns from this street onto one...

**physics**

What is the difference between a step-up and a step-down transformer? Give examples where each would be used.

**physics**

Evelyn wears glasses whose wire frames are shaped like to circles, each with an area of 7.0x10^-4 m^2. The horizontal component of the earths' magnetic field in Evelyn's hometown is 4.9x10^-5 T. If Evelyn turns her head back and forth, rotating it through 90degrees ...

**Physics**

A proton accelerates through a particle accelerator, with a final speed of 8.0 x 10^6 m/s. It experiences a magnetic field of 3.0T that is produced by steering magnets inside the accelerator. What is the number of the magnetic force pulling on the proton?

**Maths**

In a class, 18 children are girls. A quarter of the children are boys. Altogether, how many children are there in the class?

**stat**

One of the questions on a survey of 1,000 adults asked if today's children will be better off than their parents (Rasmussen Reports website, October 26, 2012). Representative data are shown in the WEBfile named ChildOutlook. A response of Yes indicates that the adult ...

**Math - Probability**

.0071 converted to a percentage (multiply by 100) is 0.71 % to the nearest 100th percent.

**Art**

Why did Pablo Picasso invent Cubism?

**science- incomplete**

More info needed

**English**

Yes, 1 and 2 mean the same thing. "a picture" means "one picture". And 3 means more than one. Adding an "s" to picture makes it plural, more than one. The sentence does not say how many, so it could be two or any number.

**Math**

What do you mean by solve quadratic?

**Math**

A rectangular grassy area in a park measures 50 yards by 100 yards. The city wishes to put a uniform sidewalk around the grassy area which would increase the area by 459 yd^2. What is the width of the sidewalk?

**Math**

Roy has a patio that covers 434 ft^2. He wants to increase his patio 196ft^2 by adding 4 feet to both the length and the width. The length of the original patio is three feet more than twice the width What is the length of the new patio?

**physics**

What is the energy of a photon of yellow light with a frequency of 5.14 Ã— 1014 Hz?

**physics**

i did divide the answer in sec but the answer still wrong can you pls do it maybe I'm doing something wrong

**physics**

Work done by runner = F *d = mg * d = 70 kg * 9.8 m/s2 * (1576 steps * 0.2 m/step) Divide your answer by time in seconds to get power output in Watts. Look up conversion to horsepower.

**Physics 30**

an 1100 kg car accelerates from rest at 3.4 m/s2. if the horizontal force exetred on the wheels by the road is 5600 N, what force must be resisting the motion of the car? use a free body diagram to illustrate your answer

**math**

x=5

**math **

The point of intersection of the diagonals of a rectangle is 4 cm further away from the smaller side than from the larger side of the rectangle. The perimeter of the rectangle is equal to 56 cm. Find the lengths of the sides of the rectangle.

**maths**

Root2+root3+root4+root6

**Physics **

An electric kettle rated accurately at 2.5kw is used to heat 3kg of water from 15% to boiling point it takes 9.5 minute. Then the amount of heat that has been lost is

**Physics**

none, F = mdV/dt = m a no a, no force

**Math**

If 1/6 cup of icing covers 2/3 of a cake, how much icing is needed to cover the entire cake? A. 1/9 B. 1/6 C. 1/4 D. 1/18

**Physics**

A boat travels at 15 m/s in a direction 45° east of north. The boat then turns and travels at 18 m/s in a direction 5° north of east. What is the magnitude of the boat’s resultant velocity? Round your answer to the nearest whole number. What is the direction of ...

**Algebra 2**

Switch your last two terms.

**Algebra 2**

Double check your second term.

**Physics**

A river is flowing at 3mps.A man can swim in still water at a speed of 6mps.The angle at which the bank at which the swimmer should start ,so that he may cross the river along the shortest distance is?

**math-incomplete**

Is the interest compounded, and if so, how often?

**Pre-Calc**

Find the values of e,a,b,and c for r=21/5-2costheta?

**Math**

On a number line, all points are marked that are 3 units away from ?2. Write this requirement using the absolute value sign.

**Pre-Calc Trig**

Create both a sine and cosine model for height of a passenger off of the ground for each of the following Ferris wheels. 1) customers must climb up 12 foot steps to get into the Ferris wheel (I.e) bottom of Ferris wheel is at the top of the steps Diameter 67ft Rotional speed 1...

**Math**

The perimeter of a triangle is 42 yards. The first side is 5 yards less than the second side, and the third side is 2 yards less than the first side. What is the length of each side?

**Physics**

A person with the weight of 691 N stands on a bathroom scale in a motionless elevator. The elevator begins to move and the scale momentarily changes to 499 N. (a) Draw a force diagram of the situation. (b) Create a qualitative vertical equation for this situation. (c) ...

**Math**

draw a diagram to represent 6 divided by 1/5

**physics**

a d'arsonval meter movement deflects to 0.8mA. what is the peak value of the alternating current if the instrument uses full-wave rectification?

**physics**

the current through a meter movement is 150 micro amperes. what is the dc value if the instrument uses half-wave rectification?

**economics**

When the price of paper increases from ?$150 to ?$157 per? ton, the quantity supplied increases from 200 to 210 tons per day. The price elasticity of supply is?

**Calculus**

After an hour of googling this as you suggested, I still can't find the discussions or proof you were referring to. Can you please either send the link you found or help me with this? I don't know how to even start it. Prove that the function defined by: f(x)={1 if x ...

**math**

An AP is given k,2k/3,k/3,0....calculate the sum of the first 30 terms

**Calculus**

Find the area of the region under the curve y=x+2 over the interval [1,4].

**Math**

A pyramid is a polyhedron for which the base is a polygon and all lateral faces are triangles.

**Math**

In what shape are the lateral faces of a pyramid?Please hurry!

**Math**

3 1/2 cans divided by 2 1/4 cans per wall = Number of walls she can paint

**Economics**

how would supply shift caused by lower costs of production affect price and quantity

**science**

Height of object is 1 cm placed at a distance of 15 cm from a concave mirror of focal length 10 cm. Find nature, size and position

**Math**

The perimeter of a triangle is 42 yards. The first side is 5 yards less than the second side, and the third side is 2 yards less than the first side. What is the length of each side?

**physics and motion**

The Grizwald’s have just chopped down a Christmas tree and have decided to pull it out of the woods on a sled over the snow. Clark has attached a rope to the sled and is pulling the tree/sled system (mass = 22 kg) with a force of 50.0 N at an angle of 32? above the ...

**Algebra**

If 3/5 is added to twice the reciprocal of a number , the result is 1. Find the number.

**Math**

A weather forecast states that there is a 20% probability of rain on each of the next 3 days. Describe a simulation you could perform using random numbers to find the experimental probability that it will not rain on any of the next 3 days. Would love explanation!

**History**

Those who replied no to certain questions in a loyalty questionnaire administered to internees were taken to Tule Lake and considered disloyal They were being punished for what they said Violation of Amendment 1? I think I am missing one but I am not sure. Because it says they...

**History**

Although most Japanese were pushined by being placed in internment camps they never were put on trial and were treated as automatically guilty of disloyalty to US Violation of Amendment 5 and 7? Is there another one iM missing

**History**

What is one way that Japanese Americans resisted internment

**algebra **

16L:28L what is the ratio of a fraction in simplest form with whole numbers in the numerator and denominator

**History**

Match each statement with the correct amendment. Some amendments will be violated more than once. Japanese who were suspected of spying sabotage or helping the enemy had their homes raided and had their things confiscated byt he FBI Amendment 3 and 4 Before the signing of ...

**maths**

In an arithmetical progression,the sum of the first five terms is 30,and the third term is equal to the sum of the first two.write down the first five terms of the progression.

**Ethics**

As a matter of fairness, should individuals be required to pay for health services on the basis of their actuarial risk of illness or, alternatively, on the basis of their ability to pay? help?

**Physics**

Okay so if I found t=5.04 s, then all I need to do is use d=speed*time? d=550*5.04= 2772 meters or if I add an extra 5 meters: d=555*5.04=2792.2 meters Did I do that right?

**Math**

Determine the sign of the sum of -18+11

**critical thinking**

it could be unacceptable problems in language