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Total # Posts: 109,236

math
Can someone help me and explain what (10P4-) is pls?

math 105
Suppose the scores of students on an exam are normally distributed with a mean of 501 and a standard deviation of 72. Then approximately 99.7% of the exam scores lie between the integers and such that the mean is halfway between these two integers. Use the empirical rule.

Social
Does having an unusual name, such as Chastity, Englebert or Moon unit, have an effect on how a child develops? The results of some previous studies agrees with the commonsense idea that such as name could cause a child to be rejected or ridiculed and thus could have a negative...

physics
frequency is proportional to square root of k so to double frequency you need 4 times the original k

Social Studies 1
thank you Ms.sue

Social Studies 1
3.C ?

Social Studies 1
Geographers want to know how people living in hazard-phone areas are affected by natural disasters such as floods, hurricanes, tornadoes, and earthquakes. Although the number of natural disasters has remained relatively constant over the years- thirty per year throughout the ...

Biology
What is an artery

math
For every 8 squirrels that Travis sees in his backyard, six are dining at the bird feeder. Travis saw 28 squirrels today. About how many were eating birdseed?

economics
so for 7 its c? since something created by an individual inventor does not have the government involved?

economics
7. Which situation is more likely to occur in a market economy than a command economy? A. People line up for cheap but scarce products. B. A student is guaranteed a job out of college. C. An inventor designs and produces a new type of car. D. A committee chooses which farms ...

math
The graph of the equation 8x–5y=14 passes through a point with an abscissa of 1.2. Find the ordinate of the point. I got .8 repeating but my teacher said that it was wrong. I then got 9.6 and it was also wrong. what am I doing wrong and can you put the answer with the ...

chemistry
Why can't you form an acid salt from a monoprotic acid?

physics
a ball of mass 0.220-kg that is moving with a speed of 5.5

algebra
I need to write an inequality with the following information;I have a summer business selling book markers. They cost .75 to make and I'm selling them at $4.00 each. Write an inequality with variables showing earnings with the sale price and the number sold. I'm so ...

Ethics
Should people from wealthy countries be allowed to obtain organ transplants from individuals in developing countries? Help?

Social studies
thank you

Social studies
which of the following statements about World War 1 would be most difficult to prove and disprove a. American casualties were more numerous than in any other war. b. it was the first war in which the opposing sides used airplanes c. the U.S government spent more on armaments ...

Social studies
ok i really think its D for #4, please help

Social studies
2.E 3.B 4.E

Social studies
Does having an unusual name, such as Chastity, Englebert or Moon unit, have an effect on how a child develops? The results of some previous studies agrees with the commonsense idea that such as name could cause a child to be rejected or ridiculed and thus could have a negative...

Precalculus
f(y)=-1/5y^4 What is the power function and constant of variation?

social studies please help physics
If the abesolute pressur at the bottom of a fresh water pond is 2.313*10^5 PA,what will be the depth of the pond?

french 1
true

History
Thank you

History
Explain the effects of World War II, on both the United States and on Georgia. so far I've got, the economy declined,

Science
When the sun, Earth, and moon are in a line

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
8

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.

Maths
fffff

Social Studies And Business
C B+C B A B C B A B+C A

Texas history
2 is B, just took it :)

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?

Mathematics
A.J is 100% correct for connexus

Mathematics
A.J is 100% correct for connexus

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 × 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?

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