Monday

December 22, 2014

December 22, 2014

Total # Posts: 2,863

**phys**

While spinning in a centrifuge, a 70.0 kg astronaut experiences an acceleration of 5.00 g, or five times the acceleration due to gravity on the earth. What is the centripetal force acting on her?
*December 21, 2014*

**math**

Ralph packs 9 three-fourth pound sacks of candy in each carton. How many pounds of candy is that?
*December 10, 2014*

**7th grade science**

the answer was b
*December 4, 2014*

**7th grade science **

some animals, but not humans have an organ called a gizzard located near the top of their digestive tract. this organ is small and can contain small rocks. it also has thick muscular walls. based on this physical description which of the following is most likely to be the ...
*December 4, 2014*

**5th grade math**

first take the decimal away and round for example lets say your decimal is 6.54 take away the decimal 654 now use the second number which in this case is 5 to round 6 to 7 to get 700 now add the decimal back in so you will have 7.00 same with dividing lets say you have 5.00 ...
*December 4, 2014*

**6th grade Math**

483 divided by 11.50 42 hours
*December 3, 2014*

**Math Proof**

prove f(x)=b^x is continuous on (-infinity,infinity) i.s at all a exist in reals. here assume b does not equal 1, but b>0
*December 1, 2014*

**reading**

From this paragraph, what relationship can you infer between the jogger and the writer? A. The writer is observing a typical jogger. B. The writer is in danger from the jogger. C. They are complete strangers to each other. D. They are well known to each other.
*November 20, 2014*

**Algebra, help please!!!**

Subtract 66-21? Is it a good measure of spread as well then?
*November 19, 2014*

**Algebra, help please!!!**

The youngest person in the company is 21. The oldest is 66. A: What is the range? B: Is the range a good measure of spread for the ages in the company? Why?
*November 19, 2014*

**Algebra, help please!!!**

Find the mean and the median in the following arithmetic sequences: A: 1, 3, 5, 7, 9 B: 1, 3, 5, 7, 9, . . . ., 199 C: 7, 10, 13, 16, . . ., 607
*November 19, 2014*

**MATH!!!**

Al saves pennies. He agreed to give 5/11 of his pennies to bev . If she would give 5/11 of what she got from al to carl and in return if he would give 5/11 of what he got from bev to danni, carl and agreed and danni recived 750 pennies . How many pennies did al have?
*November 19, 2014*

**Phil**

Identify the premise/s and the conclusion and label them. Complete the argument if necessary. 1.My bowl fell off of the counter and broke. If your bowl falls off of the counter, it will break. 2.You shouldn’t be so critical of War and Peace. You’ve never read it. 3....
*November 18, 2014*

**spanish**

what is 1+1
*November 18, 2014*

**Probability.. HELP!**

At the American Kennel Club, there are 36 dogs entered in a show where there will be a first-, second-, and third- place award. How many possibilities are there for these awards?
*November 13, 2014*

**Math, Please Help!**

I got 144 for TENNESSEE (9*1*2*4*2) and I got 16 for OHIO (4*2*2). I don't understand how you got your numbers and if I am doing this wrong?
*November 13, 2014*

**Math, Please Help!**

I don't understand how you got them? I have tried to figure this out and can't get the right answer on how you got your answers.
*November 13, 2014*

**Math, Please Help!**

Find the number of ways to arrange the letters in the following words: A: Ohio B: Alabama C: Illinois D: Mississippi E: Tennessee
*November 13, 2014*

**Math, Please Help!**

Suppose a dot is placed at random in a 10 x 10 graph grid in which squares have been numbered from 1 to 100 with no number repeated. Now simulate choosing 100 numbers at random between 1 and 100 inclusive. How many numbers might you expect to match the square with the dot?
*November 12, 2014*

**Algebra HELP!**

An estimate of the frog population in a certain pond was found by catching 30 frogs, marking them, and returning them to the pond. The next day, 50 frogs were caught, of which 14 had been marked the previous day. Estimate the frog population of the pond.
*November 12, 2014*

**PED 212 Foundation of Movement & Motor Activitie**

Question 1.1. Which of the following “reminders” for successful lesson planning is correct? (Points : 1) a. it helps you decide when to b.teach certain activities c. it helps you remember which level you are teaching d. it helps you assign appropriate time limits ...
*November 12, 2014*

**math**

Complete the sign for each equation 65/60 - 1 this is what the paper has on it now i think that you are supposed to put a + - * I'm not sure.
*November 9, 2014*

**Algebra HELP!**

I am lost on how to find these ways for it to equal out at the end with B and C. I don't understand these problems at all. :(
*November 6, 2014*

**Algebra HELP!**

A teacher instructed her class to take any number and perform a series of computations using that number. The teacher was able to tell each student's original number by subtracting 1 from the student's answer. Create similar instructions for students so that the ...
*November 6, 2014*

**math**

Tammy wants to get change for 30c. The only coins she can get are quarters, nickels and dimes. How many different ways can she get 30c using only these coins?
*November 5, 2014*

**probability**

A case of wine has 10 bottles, 2 of which contain spoiled wine. A sample of 3 bottles is randomly selected from the case. (a)What is probability that the sample contains 2 bottles of spoiled wine? (b)What is probability that all 3 of the sampled bottles are spoiled? (c)What ...
*November 3, 2014*

**probability**

Assume that head sizes (circumference) of new recruits in the Canadian armed forces can be approximated by a normal distribution with a mean of 22.8 inches and a standard deviation of 1.1 inches. (a)What proportion of recruits have head sizes between 22 and 23 inches? (b)Five ...
*November 3, 2014*

**physical eduaction**

Which of the following does NOT describe the concept of Growth? (Points : 1) a. measured quantitatively b. physical change c.influenced by children’s abilities d. increase in bone size
*November 3, 2014*

**Sequences**

If {x_n} is not bounded above, does x_n -> infinity? prove there exist a subsequence {x_n} where k=1 to infinity such that x_n_k -> infinity
*November 2, 2014*

**Algebra**

re-evaluate your terms. I got x^4 +5x^3 -x^2 -5x-4. my work: .5(2x^2 +4x +2)(x^2 +3x -4)=.5(2x^4+6x^3-8x^2+4x^3+4x^2 -16x+2x^2 +6x-8)
*November 2, 2014*

**statistics and probability**

A company manufactures washers, about 5% of which are defective. If a random sample of 100 washers are inspected, what is the probability that fewer than 4 are defective?
*November 2, 2014*

**Clinical Chemistry**

Not sure that is what the question asks from my instructor. I am totally confused.
*November 2, 2014*

**Clinical Chemistry**

I am not sure how to start this. You are given a 200% solution of a compound. You must dilute and construct a calibration curve to interpret concentration of compound in unknown samples. Show the steps needed to perform a two-fold serial dilution through 5 tubes.
*November 2, 2014*

**physical eduaction**

what can potentially have the most impact on physical education outcomes other than class size? a .type of equipment used b. amount of equipment available c. attitude of the classroom teacher d. lack of funding for equipment
*November 1, 2014*

**Chemistry**

Beryllium flouride's formula is BeF2. Why do beryllium and flourine combine in a 1:2 ratio?
*October 30, 2014*

**Math**

Limit as n goes to infinity of ((2n)!/(n^n)).
*October 29, 2014*

**math**

Anthony is 20. and julian is 10.
*October 29, 2014*

**Calculus**

Find the work done by F(x,y,z)=(x^2y)i=(x-z)j+(xyz)k where c=(t)i+(t^2)j+(2)k, 0<t<1. The answer is supposed to be -17/15, but i keep getting -13/10. Any help on the process would be appreciated.
*October 28, 2014*

**Math**

The medical records of infants delivered at Kaiser Memorial Hospital show that the infants' lengths at birth (in inches) are normally distributed with a mean of 22 and a standard deviation of 2.1. Find the probability that an infant selected at random from among those ...
*October 27, 2014*

**Physical Science**

I am so confused. I do not get it at all.
*October 27, 2014*

**Physical Science**

A 5.00 kg block of ice at –25 oC is converted to steam at 125 oC. How much energy (in kilojoules) is expended in this process? The following data are provided: a. Specific heat of ice = 2.092 J/g oC b. Latent heat of fusion = 334.72 J/g c. Specific heat of water = 4.184 J...
*October 27, 2014*

**Physical Science**

Lead is a soft, dense metal with a specific heat of 0.117 J/goC, a melting point of 328.0 oC, and a heat of fusion of 23012 J/g. How much heat (in kilojoules) must be provided to melt a 350.0 kg sample of lead that is initially at 20 oC?
*October 27, 2014*

**Limits**

I know that 1/n goes to zero so 2^0=1 so obviously the limit is 1. But i have to write it out and I can't seem to figure out the correct way to do this.
*October 27, 2014*

**Limits**

Prove using formal definition of limit: Lim 2^(1/n)=1 n->ininity
*October 27, 2014*

**Mathematica**

I am trying to write a matrix where n=100, and the matrix's first and last number is 2 and all the number in the middle are 1.
*October 26, 2014*

**Clark Atlanta**

Plants need carbon dioxide to produce energy. How many carbon are there in 10.0 g of carbon dioxide? this is what I have so far. 10.0g x 1mol/44.01CO2 = 227 mol CO2
*October 26, 2014*

**8th grade language arts**

Can someone post the answers to this question please.
*October 25, 2014*

**phyics**

_________ was the first to show that all objects fall toward Earth with constant ____________.
*October 23, 2014*

**Proof**

Let {x_n} and {y_n} be real valued sequences suppose x_n->0 and {y_n} is bounded. Prove that (x_n*y_n)->0
*October 22, 2014*

**Calculus**

Use linear approximation, i.e. the tangent line, to approximate \sqrt[3] { 7.9 } as follows: The equation of the tangent line to f(x) at x = 8 can be written in the form y = Using this, we find our approximation for \sqrt[3] {7.9} is
*October 21, 2014*

**Chemistry**

How would the empirical formula of copper (II) sulfate be affected if some of the sample sticks to the stirring rod?
*October 20, 2014*

**Math**

If the first dice yields an even number, what is the probability that the sum of the two dices will be equal to 12? 1st Die P(even) = 3/6 = 0.50 P(6|even) = 1/3 = 0.333 2nd Die P(6) = 1/6 = .1667 So P(12) = 0.33*0.1667 ?
*October 19, 2014*

**Probability**

If the first dice yields an even number, what is the probability that the sum of the two dices will be equal to 12? 1st Die P(even) = 3/6 = 0.50 P(6|even) = 1/3 = 0.333 2nd Die P(6) = 1/6 = .1667 So P(12) = 0.5*0.33*0.1667 ?
*October 19, 2014*

**algebra**

what is the area of a rectangle with a length that is 5 more than triple the width?
*October 16, 2014*

**calculus**

Find the center of mass in the 1st quadrant of the circle x^2+y^2=4 where rho(x,y)=k(x^2+y^2) Thanks.
*October 15, 2014*

**math**

Marcus Has 5 sticks, He gave away 0.75 of each stick away. How Many Did He He Give Away
*October 15, 2014*

**English Writing**

Can you help me write a persuasive paragraph? The topic is about 'Disposal Food'
*October 15, 2014*

**spanish**

en el primer piso puedes encontrar
*October 14, 2014*

**Poofs**

Let {X_n} be a sequence of real numbers that is bounded above by M and such that X_n-->x Prove that x<=M. This is what I have, but I believe it is wrong: Let M>0 then there exist N>=1 s.t. n>=N. then |x_n - x|<M. Since {x_n} is bounded above by the given {x_n...
*October 13, 2014*

**Math Proof**

Let {X_n} be a sequence of real numbers that is bounded above by M and such that X_n-->x Prove that x<=M
*October 13, 2014*

**Physics**

I'm having a bit of trouble with this problem. A ball is thrown upwards and stays in the air for 3.65 seconds. What is the initial velocity? (I use an acceleration of -10 m/s/s) I got an answer of 18.25 m/s/s but I'm not sure that it's correct. I would love some help!
*October 10, 2014*

**Physics**

I'm having a bit of trouble with this problem. A ball is thrown upwards and stays in the air for 3.65 seconds. What is the initial velocity? (I use an acceleration of -10 m/s/s) I got an answer of 18.25 m/s/s but I'm not sure that it's correct. I would love some help!
*October 9, 2014*

**Physics**

Thanks so much!
*October 9, 2014*

**Physics**

I'm having some trouble figuring out how to do the following question: A ball punted vertically has a hang time of 3.65 seconds. What was its initial velocity? (I use an acceleration of -10 m/s/s) Thanks!
*October 9, 2014*

**Math**

You can use the Pythagorean equation (a^2 + b^2= c^2 ) because the triangle the diagonal and the 2 sides make is a right triangle. H= height of rectangle 14+H= width of rectangle H^2 + (14+H)^2 = 26^2 Solve for h to find height:)
*October 9, 2014*

**math**

Yolo has two pieces of string. One is 32 inches long, and the other is 48 inches long. She wants to make as many necklaces as she can, all of the same length. What is the longest a necklace can be?
*October 8, 2014*

**Math**

There are 54 graders who play sports. Twenty-seven play baseball. The rest play soccer. Second grade has 37 soccer players. How many students play soccer?
*October 8, 2014*

**Statistics**

You own shares of Fidelity Magellan Fund (FMF), which concentrates on stocks of large American companies. Its monthly return is μFMF = 1.4% and sFMF = 4.70%. You decided to diversify your portfolio by adding shares of the Fidelity Japan Fund (FJF), which has monthly ...
*October 8, 2014*

**Statistics**

In a sophisticated medicine research center, two scales are used for repeated weighing of the same item. If the true weight of a compound is 2 grams [g], the first scale produces readings X that have a mean 2.0 g and standard deviation 0.03 g. The second scale’s readings ...
*October 8, 2014*

**Math**

An airplane flys at a constant altitude of 2 miles and a constant speed of 600 miles per hour on a straight course that will take it directly over a kangaroo on the ground. How fast is the angle of elevation of the kangaroo's line of sight increasing when the distance from...
*October 7, 2014*

**English**

After one drink, he drank another, it means that he fluidly drank a lot, until he fell asleep
*October 6, 2014*

**Pre Calculus**

It does not say anything really about finding how many positive and negative roots. It only says how you can find the number of zeros.
*October 6, 2014*

**Pre Calculus**

Using Descartes' Rule of Signs how can you determine the number of positive and negative zeros (roots) a polynomial may have?
*October 6, 2014*

**History *repost* (sorry!)**

Yes, I believe so
*October 6, 2014*

**Math**

I see, for this problem you would have to plug in numbers with trial and error, by doing this you get x=-2 as one of the roots, then you would factor (x+2)out of the problem. Then you would get x²-6x+9. This is a perfect square, so when you factor that, you get (x-3)^2. ...
*October 6, 2014*

**Math**

You would factor by grouping
*October 6, 2014*

**AP English Language and Comp**

Chillingworth, because he practically devoted his whole life to evil
*October 6, 2014*

**AP English Language and Comp**

Whose sin is blacker- Chillingworth's or Dimmesdale's? Why? (The Scarlet Letter)
*October 6, 2014*

**Algebra II**

You are correct!
*October 6, 2014*

**Geography**

By footprints do you mean carbon footprint? If so, countries with larger carbon footprints are generally more advanced and are industrialized, while countries with smaller footprints are generally less developed.
*October 6, 2014*

**Pre Calculus**

It says, Use the Factor theorem to determine whether x-c is a factor of x: f(x)=-4x^3 +5x^2 +8 and c=-2 That is what it says in the textbook
*October 6, 2014*

**Pre Calculus **

If f(x)=-4x^3 +5x^2 +8 and c=-2 is c a factor of x?(Use the Factor Theorem)
*October 6, 2014*

**Math**

They are imaginary because a negative number cannot be square rooted.
*October 6, 2014*

**Math Proof**

0<=b_n<=a_n. a) if a_n-->0 then b_n-->0. b) if a_n-->infinity then b_n-->infinity I don't know where to start.
*October 6, 2014*

**math**

Is she giving 3 pieces of candy to each student?
*October 6, 2014*

**Algebra**

Find a number such that the sum of two times the number and six times its reciprocal is 79/5.
*October 6, 2014*

**US History**

The teacher didn't give us a textbook, I would just like to know the different economic purposes between the two colonies.
*October 5, 2014*

**US History**

Can you elaborate on that a little bit more?
*October 5, 2014*

**US History**

Although the New England, and the Chesapeake region were both settled largely by people of english orgin, by 1700 the regions had evolved into 2 distinct societies. Why did this difference in development occur?
*October 5, 2014*

**Geography**

Should geographers regard culture and social customs as generalizations about a group of people, or should they say it comes from people's interaction with the physical environment?
*October 5, 2014*

**math**

In mathematics class, 30 students received an A on the third test, which is 125% of the students who received an A on the second test. How many students received an A on the second test?
*October 5, 2014*

**math**

explain what do you need to do to extend number pattern?
*October 2, 2014*

**Pre-Calculus/Trigonometry**

-y=-3x y=3x 5x+2(3x)=22 5x+6x=22 11x=22 x=2 y=3(2) y=6
*September 29, 2014*

**EVERYONE**

HI. For one of my classes i need to invent/innovate a product. So it is a year long project and if anyone has anyone sort of ideas it would be really helpful. Thanks (Thin along the lines of what you really hate and need fixed)
*September 29, 2014*

**Numerical Analysis**

Find the parabolically terminated cubic spline through the data ppoints (0,1),(1,1)(2,1)(3,1),(4,1). Is this spline also not-a-Knot? natural?
*September 29, 2014*

**math mks**

the tempreture was -8 f at 6 a.m. and rose 15 f at 9 a.m. the answer is 7 what is the question?
*September 29, 2014*

**Physics**

A swimmer, capable of swimming at a speed of 1.44 m/s in still water (i.e., the swimmer can swim with a speed of 1.44 m/s relative to the water), starts to swim directly across a 2.21-km-wide river. However, the current is 0.840 m/s, and it carries the swimmer downstream. (a) ...
*September 28, 2014*

**physics**

A radar antenna is tracking a satellite orbiting the earth. At a certain time, the radar screen shows the satellite to be 118 km away. The radar antenna is pointing upward at an angle of 58.2 ° above the ground. Find (a) the x and (b) the y components (in km) of the ...
*September 28, 2014*

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