# Posts by Megan

Total # Posts: 1,191

**Physics**

Two identical cars (m = 1350 kg) are traveling at the same speed of 28.1 m/s. They are moving in the directions shown in the drawing. What is the magnitude of the total momentum of the two cars?

**physics**

170dB

**elementary functions**

f(x)=x(squared)+x-3. compute the difference quotient: (f(x+h)-f(x))/h

**Physics**

How long does it take T-Rex to reach its food 200m away assuming that he starts from rest and accelerates at 4.00 m/s2?

**physics**

Sheena can row a boat at 3.13 mi/h in still water. She needs to cross a river that is 1.10 mi wide with a current flowing at 1.75 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head 60.0° upstream. (a) What is her speed with ...

**Chemistry- Please Help!!**

K=[fe3+][OH-]^3

**math**

factor (m/4 + n/3)(3m/4 - 2n/3) Is this the answer? if not, what did I do wrong? 3m^2/16 + mn/12 - 2n^2/9

**math**

solve for c: 3/4(2c+3)+3/5(8c-2)=9c

**math**

a ship leaves a port at 6 am traveling due east at 12mph. another ship leaves a port 11 am traveling due north at 15 mph. how far apart are they at 11pm to the nearest tenth mile?

**math**

When I went kite flying the other day, I let out an entire roll of string (400 feet). If when the string pulled tight formed a 40 degree angle with the ground, about how high was the kite?

**math**

Two metal alloys, containing 26% copper and 54% copper are to be mixed together to get 210 oz that is 30% copper. How much of each should be used?

**Stats**

Two dice are tossed. What is the probability that the sum of both dice is a prime number? this is the answer i have ; Presuming two fair, 6-sided dice, each numbered 1 through 6: You can achieve one of the following results on any given roll: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12...

**Economics**

What do you think are the pluses (advantages) and minuses (disadvantages) when firms have market power? Be sure to explain your answer from a consumer and a firm’s point of view. why did ESPRIT closed all stores in the U.S. Include a few of these word Diseconomies of ...

**Economics**

What do you think are the pluses (advantages) and minuses (disadvantages) when firms have market power? Be sure to explain your answer from a consumer and a firm’s point of view. why did ESPRIT closed all stores in the U.S. Include a few of these word Diseconomies of ...

**Chemistry**

What is the normality of a solution which contains 4.03-g of sodium carbonate in 300.-mL of solution?

**Social Studies help needed**

THANKS @smart one :)

**government**

which provides evidence that political parties are not as strong as they once were? A. the increasing number of independents B. the lack of straight-ticket voting C. increased spending on campaigns D. increased numbers of registered Democrats

**Governmnet**

which of the mass media has the most impact on american politics? A. television B. the internet

**Math**

There are 6 members in a club and only 4 computers.Club meets for 60 minutes. Each member wants equal computer time. How much time should each student have?

**math**

Fred arrives at the subway station every day at a random time and takes the first train that arrives. If he takes the A train, which arrives each hour on the hour, he ends up at the fitness center. If he takes the B train, which arrives every hour 15 minutes after the A train...

**math**

A small grill can hold two hamburgers at a time. If it takes 5 minutes to cook one side of a hamburger, what is the shortest time needed to cook both sides of five hamburgers? 30 15 20 25

**Math help please**

I agree with Ms. Sue. Negative number play seems to be the problem with the incorrect problems.

**Chemistry**

How do you find the equilibrium constant of: B + O2 <-> BO2 ??

**Calculus**

A rectangle in the first quadrant has one vertex as the origin, and other vertex on the curve y= -x^2 -2x +4. If the rectangle has one side lying on the x-axis, find the largest possible area of the rectangle.

**Calculus**

A rectangle in the first quadrant has one vertex as the origin, and other vertex on the curve y= -x^2 -2x +4. If the rectangle has one side lying on the x-axis, find the largest possible area of the rectangle.

**Statistics 7**

A doctor wants to estimate the HDL cholesterol of all 20 to 29 year old females. How many subjects are needed to estimate the HDL cholesterol within 2 points with 99% confidence assuming s-17.8 based on earlier studies. Suppose the doctor would be content with 90 % confidence...

**7 STATS MATHGURU PLEASE HELP**

A doctor wants to estimate the HDL cholesterol of all 20-29 year old females. How many subjects are needed to estimate the HDL cholesterol within 2 points with 99%confidence assuming s=17.8 based on earlier studies? Suppose the doctor would be content with 90% confidence. How ...

**Stats help**

A poll conducted in 1972 asked 1003 people, " During the past year, about how many books did you read either all or part of the way through?" Results of the survey indicated that x-bar=18.9 books and s=1 9.9 books. A)Construct a 95% confidence interval for the mean ...

**Stats help**

MathGuru, how do i determine the z-score for this one?

**Stats help**

A poll conducted in 1972 asked 1003 people, " During the past year, about how many books did you read either all or part of the way through?" Results of the survey indicated that x-bar=18.9 books and s=1 9.9 books. A)Construct a 95% confidence interval for the mean ...

**STATSHELP**

Got it thanks!

**STATSHELP**

Thanks!!!!!!!!!

**STATSHELP**

A poll was conducted that asked 1015 people how many books they had read in the past year. Results indicated that x-bar= 12.3 books and s=16.6 books. Construct a 95% confidence interval for the mean number of books people read. ____, _____ PLEASE HELP ME!!!!!!!!!!!!

**STATISTICS**

THANK YOU!

**STATISTICS**

Determine the point estimate of the population mean and margin of error for the confidence interval. Lower bound is 15, upper bound is 27. A)The point estimate of the population mean is ________. B) The margin for error for the confidence interval is _______. HELP

**Statistics**

THANK YOU

**Statistics**

A researcher wishes to estimate the proportion of adults who have high-spped internet access. What size sample should be obtained if she wishes the estimate to be within .02 with 90% if A) She uses a previous estimate of 0.48? B) She does not use any prior estimates? Please ...

**6th grade math**

Square root is just a fancy word for a number multiplied by its self. So you can also look at a very large multiplication table and look at 5 x 5 and 25 x 25 and so on.

**stats**

From previous records, a shipping company knows that the cost to deliver a small package within 24 hours is $15.50. The company charges $17.95 for shipping, but guarantees to refund the full charge if the delivery is not made within 24 hours. If the company fails to deliver ...

**Stats**

Recall that in the week 2 assignment, a certain company hired three new managers from a pool of seven men and five women. All three hires were women, and the men complained of gender bias. Compute the theoretical probability that a fair selection process (in which each person ...

**math**

If you randomly select one jar containing two cherry candies, two liquorice candies, and one peppermint candy, What is the probability of selecting a cherry candy? 1/6 1/5 1/3 2/5

**science**

Meiosis is reproductive process that produces four haploid sex cells from one diploid cell and ensures offspring will have the same number of chromosomes as the parent organisms.

**science**

Asexual reproduction is a type of reproduction----fission, budding, and regeneration---in which a new organism is produced from one organism and has DNA identical to the parent organism. Sexual reproduction is a type of reproduction in which two sex cells, usually an egg and a...

**Math**

Thanks

**Math**

I know that I am saying this is how I am going to explain it. There is an answer choice it has: choice a)n/18 = 252 Choice b) 252/n = 18 Choice c) 18=n/252 Choice d) 252= 18/n Which is correct?

**Math**

Because I don't know how to post answer choices in FRACTION form???????

**Math**

All of my answer choices are in fraction form....

**Math**

Pam gave 252 water balloons to the people who came to a summer party. Each person received 18 balloons. Which equation can be used to find n, the number of people who came to the party?

**Precalculus**

Jessica deposited $785 into an account that pays 6.2% interest compounded continuously. How long will it take until Jessica has $1000?

**Statistics**

IQ score are normally distributed with a mean of 95 and a standard deviation of 17. If the sample size is n=36 find the mean and standard distribution of sample mean

**Science**

How do the oceans support life? How have the oceans and their marine life changed through time?

**Chemistry**

Okay so I'm having a brainfart here. I'm doing a titration problem and have got to the point of: 3.6x10^9 = (.01218-x)/(x)(.00316+x) I don't know how to proceed from there and use the quadratic formula as silly as it sounds. Any help would be appreciated!

**Math**

So then the equals 3.3 ???? that's not an answer choice

**Math**

One week, Mrs. Peterson went to her health club on Monday, Wednesday, and Friday. Each day she went to the club, she jogged on the treadmill for 3/5 hour, lifted weights for 1/4 hour, and then cooled down by stretching for 1/4 hour. On Saturday, she rode her bike for 3/4 hour...

**Algebra 1**

4. What is the value of the 11th term in the sequence? -1 , 5 , 11 , 17 , 23 , ...

**physics**

Calculate the mass needed in order to suspend the leg shown in the figure(Figure 1) . Assume the leg (with cast) has a mass of 14.0 , and its CG is 34.0 from the hip joint; the sling is 81.5 from the hip joint.

**Accounting 1**

Red Bank Enterprises was involved in the following transactions during the fiscal year ending October 31: 8/2: Borrowed $75,000 from the Bank of Kingsville by signing a 120-day note. 8/20: Issued a $40,000 note to Harris Motors for the purchase of a $40,000 delivery truck. The...

**Ecology**

It's 3. Alter the environment. The rest are incorrect.

**Help!!!**

Help!!!

**chemistry**

Help??

**chemistry**

It was a very cold day -10 C. Victor went outside to pick up the morning newspaper. He quickly noticed the icicle that formed on the nearby flagpole. Curiosity got the best of him, and he decided to lick the ice on the flagpole. Instantly, Victor's tongue is attached to ...

**Math**

The total resistance of two circuits in parallel is 18 ohms and one circuit has five times the resistance of the other, find the resistance of each circuit. Use 1/R=1/R1+1/R2. R1 and R2 are two individual resistances. a)Find the smaller resistance b)Find the larger resistance

**Math**

The total resistance of two circuits in parallel is 15 ohms and one circuit has five times the resistance of the other, find the resistance of each circuit. Use 1/R=1/R1+1/R2. R1 and R2 are two individual resistances. a)Find the smaller resistance b)Find the larger resistance

**math**

a person can copy the final exam in 28 minutes using a new copy machine. using an old copy machine, it takes 70 minutes. if both machines are used, how long will it take to complete the job

**Math**

someone can mow his lawn in 48 minutes. if his daughter helps, they can do it in 40 minutes, how long would it take for his daughter to mow the lawn by herself?

**physics**

The speed of all electromagnetic waves in empty space is 3.00 × 108 m/s. What is the wavelength of visible light emitted at 7.2 × 108 MHz? Answer in units of m

**Science**

How do mutations lead to cancer?

**Science**

How do mutations lead to cancer?

**Social Studies**

The anonomous answer is 100% correct!!!!

**Social Studies**

I do not know @a but I am doing the test and I will tell you when I am done, hopfully it is right

**Social Studies**

I do not know a but I am doing the test and I will tell you when I am done, hopfully it is right

**Math**

so 6km/hr is the answer??

**Science**

Thanks so you add 3+4+2.5=9.5 for distance. 25+40+30=95 9.5km/95min=0.1km/min=6 km/hr. so 6km/hr is the answer to everything or this whole problem?

**Science**

Help!!!!!!

**Science**

George walks 3 km on Monday and 4 km of Tuesday and 2.5 km on Thursday. On Monday, he walks 25 mins., Tuesday 40 mins., and Thursday 30 mins. What is his average speed? d= t= help please

**chemistry**

A catalytic converter combines 2.55 g CO with excess O2. What mass of CO2 forms?

**math**

I am sorry you are just confusing me by all these numbers!!!!!!!!!!!!

**math**

So 975$ is the answer to the whole math problem?

**math**

Okay.

**math**

Okay thanks I kind of understsnd it now

**math**

Thanks Jessica? But I don't know

**math**

Then the answer is the$750?

**math**

Is the answer $84?

**math**

Would I divide 300 by 2.50?

**math**

Hello! I am confused on how to do this math problem. Can you please help me or explain how you get this answer please? Miriam orders a shipment of 1, 500 pounds of ice for her supermarket. The ice comes in individual 5-pound bags that cost Miriam orders$2.50 each. Miriam sells...

**Chemistry**

PLease Help me!!!!!!!!!!!

**Chemistry**

Help!!!!!!!!!!!! Fe + CuSO4 --> Cu + FeSO4 2.05g 7.00g 2.46g 151.8g Which reactant was limiting and how does this chemical equation support this? The numbers beneath the names are the masses in grams.

**Physics**

You first have to find the acceleration of what is given. F1 has force of +8.0N, and box has mass of 4.7kg. F = ma, so 8.0/4.7 is 1.7m/s2. Now to view the other question, you'd use the same equation only this time, you need to use the newly acquired acceleration from above...

**math**

75%? Who is Jessica?

**math**

Find the % of Discount Regular Price $25,000 Sale Price $22,000

**Math**

Now how would I do this? This is so confusing. LUNCH You bought 3 pieces of chicken that cost x dollars each, a salad for $3, and a drink for $1.

**Math**

4(y-3)+9-3y I come out and get 4y-12+9-3y What do I do now? I'm so confused! I don't know it !:(

**Math**

Hello! I am needing some help on Algebra! It is hard ! Can you explain how to Simplify Algebraic Expressions? The easiest way? I have a test over it Friday, and i can't understand it at all! Can you help with these and explain? -12z+4(z-9)+30+z and 4(y-3)+9-3y

**chemistry**

would the ratio of moles of Cu:moles of CuCl2 differ from atoms of Cu:formula units of CuCl2? Why or Why not?

**Spanish**

1) B 2)C 3)B 4) B

**Science**

Hello Steve. I have another question... why is Meiosis important?

**math**

Thank u. Can you also help me at -19 (v-1)

**math**

It was supposed to be (-32-s)(-9). I copied it wrong, Sorry Steve!

**math**

(-32)-s (-9) I am not good at algebra. I am supposed to use the distributive property, but not sure where to begin.

**Math**

$45 at 2% for 5 years