Sunday
December 21, 2014

Posts by Jacob


Total # Posts: 676

algebra
2y^-3 = 4e^(-x/2)/(1+e(-x/2)) my teacher gave this problem in my chem class and i dont know what he is really asking , does any one have an idea if i have to solve for y or what's going on..
September 18, 2010

CALCULUS
Use the product rule to calculate the derivative. dh dx x = 4 , h (x) = (x^(-1/2) + 7x)(9 - x^-1) very weird.. i know how to do it, i used product rule and got an answer in decimal but the website is not accepting it. Can any one help me?...
September 18, 2010

chemistry
how would one do this problem.. 2y^-3 = 4e^(-x/2)/(1+e(-x/2))
September 18, 2010

Math
What is 87 to the power of 8?
September 17, 2010

physics
if you are an observer moving at 3.2 m/s towards an object that is moving toward you at 1.4 m/s, what is the relative velocity of the object moving toward you?
September 16, 2010

Physics
The drawing shows an elastic cord attatched to two back teeth and stretched across a front tooth. The purpose of the arrangement is to apply a force to the front tooth. If the tension in the cord is 1.2N what are the magnitude and direction of the force applied to the front ...
September 15, 2010

Math
Yes, thank you. I was doing it that way, but didn't know if I was correct.
September 14, 2010

Math
Find: Re[1/(2+j)] Im[2+j/(3+4j)]
September 14, 2010

History
Yes or no. To have a favorable balance of trade, a country must sell fewer goods to other countries than it buys from other countries. Yes or no.Money is an example of an capital resource. Yes or no.In our economic system, people receive wages for producing goods or providing ...
September 12, 2010

college math
stratified sampling
September 11, 2010

English
I agree with SraJMcGin, that will give you the answers.
September 8, 2010

Algebra 1
Thank you Jen. U r great
August 30, 2010

Algebra 1
pythagorean theorema=13 b=9 c=?
August 30, 2010

ARTICLES OF CONFED. - HISTORY
How did the Confederation Congress attempt to colve the problem of staus of western territory that the states had ceded to it? Which interest groups favored which plans for the sale and distribution of land?
August 30, 2010

Algebra
Kate cut a 100-foot rope into two pieces. One piece was 5 feet longer than 4 times the length of the other. Find the length of each piece.
August 26, 2010

math
The height of a rocket in meters t seconds after it is launched is approximated by the polynomial 0.5 at2 + vt + y where a is always -9.8, v is the initial velocity, and h is the initial height. The 4400i was launched from the ground at the same time the Q99 was launched from ...
August 16, 2010

math
The height of a rocket in meters t seconds after it is launched is approximated by the polynomial 0.5 at2 + vt + y where a is always -9.8, v is the initial velocity, and h is the initial height. A 300X was launched from a height of 10 meters. What was its height after 3 seconds?
August 16, 2010

english
in the diary of anne frank. how does anne use imagery to describe both the environment of her hiding place and the people in it.
August 11, 2010

English
How does Anne use imagery to describe both the environment of her hiding place and the people in it?
August 11, 2010

Math
how do you find the fractional notation for the ratio of 54.28 to 89.69
August 4, 2010

Geometry
It should be D. If the hypotenuse and leg of a right triangle are congruent to the hypotenuse and leg of another right triangle, then the triangles are congruent
June 29, 2010

math
A 16-ft ladder is sliding down a wall as shown in the figures below. The variable h is the height of the ladder's top at time t, and x is the distance from the wall to the ladder's bottom. Suppose that the top is sliding down the wall at a rate 5 ft/s. Calculate dx/dt ...
June 29, 2010

Statistics
Assume that about 45% of all U.S. adults try to pad their insurance claims. Suppose that you are the director of an insurance adjustment office. Your office has just received 110 insurance claims to be processed in the next few days. What is the probability that fewer than 45 ...
June 26, 2010

Statistics
Assume that about 45% of all U.S. adults try to pad their insurance claims. Suppose that you are the director of an insurance adjustment office. Your office has just received 110 insurance claims to be processed in the next few days. What is the probability that fewer than 45 ...
June 25, 2010

Statistics
Assume that about 45% of all U.S. adults try to pad their insurance claims. Suppose that you are the director of an insurance adjustment office. Your office has just received 110 insurance claims to be processed in the next few days. What is the probability that fewer than 45 ...
June 25, 2010

Statistics
. Suppose that about 20% of those called will find an excuse (work, poor health, travel out of town, etc.) to avoid jury duty. If 14 people are called for jury duty, what is the probability that all 14 will be available to serve on the jury? Round your answer to three decimal ...
June 25, 2010

Statistics
. As the sample size increases The confidence interval also increases (gets larger) The confidence interval decreases (gets smaller) The confidence interval stays the same The population mean increases.
June 22, 2010

Statistics
What is meant by the 95% confidence interval of the mean ? That 95% of my sample is OK to do more tests. That I am 95% confident that the confidence interval will contain the parameter being estimated. That 5% of my sample is not OK. That I am 95% sure that the population mean...
June 22, 2010

Statistics
Suppose in a carnival game, there are six identical boxes, one of which contains a prize. A contestant wins the prize by selecting the box containing it. Before each game, the old prize is removed and another prize is placed at random in one of the six boxes. Is it appropriate...
June 21, 2010

Statistics
Suppose in a carnival game, there are six identical boxes, one of which contains a prize. A contestant wins the prize by selecting the box containing it. Before each game, the old prize is removed and another prize is placed at random in one of the six boxes. Is it appropriate...
June 21, 2010

Statistics
Suppose that x has a distribution with = 10 and = 5. If a random sample is taken of size n = 44, find . 10.00 my answer was 0.75 is this correct 0.75 1.51 0.11 5.00
June 20, 2010

Statistics
. A certain company makes 12-volt car batteries. After many years of product testing, the company knows that the average life of a battery is normally distributed, with a mean of 45 months and a standard deviation of 7 months. If the company does not want to make refunds for ...
June 20, 2010

Statistics
Suppose I am using the t-distribution to estimate or test the mean of a sample from a single population. If the sample size is 25, then the degrees of freedom are ____? I have an answer of 26 is this correct
June 17, 2010

Statistics
Suppose in a carnival game, there are six identical boxes, one of which contains a prize. A contestant wins the prize by selecting the box containing it. Before each game, the old prize is removed and another prize is placed at random in one of the six boxes. Is it appropriate...
June 17, 2010

Statistics
I am having trouble understanding standard normal distribution such as if p(z<-0.13) the answer to that was 0.4483 but not understanding how that is computed.
June 17, 2010

Statistics
Suppose a certain species bird has an average weight ofx=3.55 grams. Based on previous studies, we can assume that the weights of these birds have a normal distribution with 0=0.37 grams. For a small group of 15 birds, find the margin of error for a 70% confidence interval for...
June 17, 2010

Statistics
In a random sample of 508 judges, it was found that 281 were introverts. Let p represent the proportion of all judges who are introverts. Find a point estimate for p. Round your answer to four decimal places. I am needing assitance in trying to figure out the correct formula ...
June 17, 2010

Statistics
I am having trouble understanding standard normal distribution such as if p(z<-0.13) the answer to that was 0.4483 but not understanding how that is computed.
June 17, 2010

Statistics
Can a frequency distribution have overlapping classes? Sometimes No Yes Can't determine. I need more information my answer is sometimes, but i believe this to be incorrect
June 17, 2010

Statistics
Which of the following can be classified as Discrete and Quantitative data. The acceleration of your car as you drive to school. my answer was number of neighbors still unsure of this though The different colors of the eyes of your classmates. The number of students in your ...
June 17, 2010

Statistics
Which of the following can be classified as Discrete and Quantitative data. The acceleration of your car as you drive to school. my answer was number of neighbors still unsure of this though The different colors of the eyes of your classmates. The number of students in your ...
June 16, 2010

Statistics
Can a frequency distribution have overlapping classes? Sometimes No Yes Can't determine. I need more information
June 16, 2010

Statistics
I am having trouble understanding standard normal distribution such as if p(z<-0.13) the answer to that was 0.4483 but not understanding how that is computed.
June 16, 2010

Statistics
Can a frequency distribution have overlapping classes? Sometimes No Yes Can't determine. I need more information
June 16, 2010

Statistics
Which of the following can be classified as Discrete and Quantitative data. The acceleration of your car as you drive to school. my answer was number of neighbors still unsure of this though The different colors of the eyes of your classmates. The number of students in your ...
June 16, 2010

Statistics
Suppose in a carnival game, there are six identical boxes, one of which contains a prize. A contestant wins the prize by selecting the box containing it. Before each game, the old prize is removed and another prize is placed at random in one of the six boxes. Is it appropriate...
June 16, 2010

Statistics
Richard has been given a 5-question multiple-choice quiz in his history class. Each question has four answers, of which only one is correct. Since Richard has not attended the class recently, he does not know any of the answers. The success occurs if Richard answers a question...
June 15, 2010

Statistics
How many sequences contain exactly three heads when you flip a coin five times? 2 15 10 8 12 my answer was 15 ,but that was incorrect
June 15, 2010

Statistics
still questionable not understanding how to get the problem with the correct answer
June 15, 2010

Statistics
You draw two cards from a standard deck of 52 cards and replace the first one before drawing the second. Find the probability of drawing a 4 for the first card and a 9 for the second card. Round your answer to the nearest thousandth. 0.006 0.039 0.019 0.155 0.026 which wwould ...
June 15, 2010

Statistics
A football team’s coach predicts that his team will win 9 out of 10, or 90%, of its games. Which method did he most likely use to make this prediction my answer to this is relative frequency is this correct equally likely outcomes intuition law of large numbers ...
June 15, 2010

Statistics
httth
June 14, 2010

Statistics
A football team’s coach predicts that his team will win 9 out of 10, or 90%, of its games. Which method did he most likely use to make this prediction my answer to this is relative frequency is this correct
June 14, 2010

Statistics
how to sketch the areas under the standard normal curveover the indicated intervals and find the specified areas to the left z=0 to the left z=-0.47 to the left of z=0.45
June 14, 2010

Statistics
fawnsbetween one and five months old have a approx body weight of u=27.2 kilograms and a standard deviation of o= 4.3 kilograms let x be the the weight of the fawn in kilograms convert the following x intervals to z intervals. x=<30 19<x 32<z<35
June 14, 2010

Statistics
What are the values of the mean and standard deviation of a normal standard deviation
June 14, 2010

Statistics
does a raw score less than the mean correspond to a positive or negative score? what about a raw score greater than the mean.
June 14, 2010

language arts
There is this paper that my teacher gave me and its sooooooo confusing.The directions say:change the word at the bottom of each ladder to the word at the top.Change one letter at a time.Rules:1.If the letter is to the right of the step,remove the word and put another letter in...
May 31, 2010

music
i cant figure out what a quarter note,scale,tie,treble clef,fermata,accent,half note,sharp, and a stem look like
May 31, 2010

health
im learning about skin @ hair but im stuck on questions about the dermis
May 31, 2010

algebra 1
v^2-7v-30/v^2-5v-24
May 20, 2010

math
what is the rule for Table 1?what are the missing output entries in Table?
April 21, 2010

Math
What is the area and perimeter of a quadrilateral that has a width of 4m and length of 14m
April 20, 2010

calculus
A uniform thin sheet of metal is cut in the shape of a semicircle of radius R and lies in the xy plane with its center at the origin and diameter lying along the x axis. Find the position of the Center of Mass using polar coordinates.
April 19, 2010

Physics
ok formula L=Iw i know I=5kgm^2 and i am finding w. How would i go about finding L give me a hint.
April 13, 2010

Physics
Wong is standing on a turntable in class holding a weight in each hand a distance .75 meters from the center of his body. He is originally rotating with an angular frequency w=0.3 rad/s. He pulls the weights in so they are only .25 meters from the axis of rotation. The ...
April 13, 2010

physics
A box is pulled across a horizontal surface at a constant speed by a horizontal rope with tension T=30N. The coefficient of friction between the box and surface is uk = 0.05. 1. Calculate the work done by friction as the box moves 4 meters to the right. i thought it would be ....
April 13, 2010

physics
momentum is p=mv so p(brother)=(35.6)(9.50)and p(skateboard)= (1.3)(9.50) solve and add them.
April 13, 2010

Physics
A student gets a 2.9 kg mass to oscillate up and down on bottom of a light vertical spring by pulling her hand up and down on the top end of the spring. The spring is a real spring with a spring constant of 93 N/m and a damping constant of 0.7 N sec/m. (b) The student now ...
April 13, 2010

Physics
Two geekie physics students with a combined mass of 131 kg jump into their old car to run out for some late night pizza. The distance between the front and back axles of the car is 2.9 m. When they get in the car, the springs compress a total of 9.3 cm. On their way to the ...
April 13, 2010

trigonometry
It would be 2pi/6 because period (1 oscillation) = 2pi/b
April 13, 2010

Physics
A student gets a 2.9 kg mass to oscillate up and down on bottom of a light vertical spring by pulling her hand up and down on the top end of the spring. The spring is a real spring with a spring constant of 93 N/m and a damping constant of 0.7 N sec/m. (a) At what approximate ...
April 12, 2010

Physics
Two geekie physics students with a combined mass of 131 kg jump into their old car to run out for some late night pizza. The distance between the front and back axles of the car is 2.9 m. When they get in the car, the springs compress a total of 9.3 cm. On their way to the ...
April 12, 2010

physics
A student throws a 9 gram of gum is thrown across the physics lab from a distance of 2.5 m. When the gum has a horizontal velocity of vo it connects with a mass on the end of 1.62 kg simple pendulum which is initially at rest. The pendulum has a length of L of 0.74 m. The gum ...
April 12, 2010

Physics
nvm i got it, thanks for the help guys.
April 9, 2010

Physics
can you write me some kind of a equation or explain to me in a way which i can understand. because what they wrote is just flying over my head and i have already spent a good amount of time trying to figure these out. so please help
April 9, 2010

Physics
A physics student of mass mm = 100 kg gets a summer job painting houses. On his first project, he builds a platform using large pine board with a mass of mb = 60 kg The board has an overall length of L = 8.5 meters and set on two 1 meter tall saw horses so that l = 2.25 ...
April 9, 2010

Biology---Urgent!
if you are using APA, then its the (author, p. 4-9) I believe.
April 5, 2010

Chemistry New question
If 12.5 mL of 8.6 multiplied by 10-2 M NaOH is added to 32.5 mL of 6.0 multiplied by 10-4 M NaOH, what is the pH of the solution?
April 5, 2010

Chemistry: Acid Base Equilbria
pH = .5 (pka1)
April 5, 2010

Chemistry
A 1.50 M solution containing 25 Grams of Al(OH)3 would occupy what volume in liters?
March 29, 2010

map
How do you draw a net duagram for a group of cubes???!!!
March 23, 2010

frictonsplease
please help with frictions thanks
March 19, 2010

5th grade
What events led up to the Civil War? A State's Rights B Slavery C All of the above
March 19, 2010

U.S. History 5th grade
Who was the 21 president?
March 19, 2010

5th grade
Who was the 100 year war between? I honestly have no idea.
March 18, 2010

5th grade
What did the 100 year war do the economy?
March 18, 2010

4th grade social studies
Neither sides are involved in a war perhaps.
March 17, 2010

english
after the rain ended, the sky became blue --is this a complex sentence?
March 14, 2010

english
the sentence--marsha speak excellent german should german be capitlized
March 12, 2010

math
Hey I need some help with this problem. Any ideas on how to solve it? Thanks lots. : A hardware supplier manufactures three kinds of clamps, types A, B and C. Production restrictions require them to make 10 units more type C clamps than the total of the other types and twice ...
March 12, 2010

english
compound words -which is correct thirty one -self-evident -QUICKLY-RUNNING -OR SPUR OF THE MOMENT-DECISION
March 11, 2010

Science-Chem
Sucrose, C12H22O11, is burned to produce carbon dioxide and water. What is the balanced formula and reaction type?
March 8, 2010

math
Bill, Ernie, Oscar, Sammy and Tony are the five basketball players on the starting team of the varsity squad. Each one is known by a different one of these five nicknames: Slats, Stretch, Tiny, Tower, and Tree. From the information given, determine the nickname of each player ...
February 24, 2010

math
Bill, Ernie, Oscar, Sammy and Tony are the five basketball players on the starting team of the varsity squad. Each one is known by a different one of these five nicknames: Slats, Stretch, Tiny, Tower, and Tree. From the information given, determine the nickname of each player ...
February 24, 2010

Chem answer check/ help
For each of the following water-soluble compounds, indicate the ions present in an aqueous solution: NaI K2SO4 NaCN Ba(OH)2 (NH4)2SO4 would the answer to NaI be Na+ I-? Should there be more to my answer? Would K2SO4 be K+ SO-? Thanks for the explanation.
February 22, 2010

Chem answer check
Which of the following are strong electrolytes? BaCl2 AgNO3 PbI2 Pb(NO3)2 KI I think they are all strong electrolytes. Is this correct?
February 22, 2010

Math
looking for help with find the slope and the y intercept for y = 5 please help
February 18, 2010

AP Chemistry
The heat of reaction for burning 1 mole of a certain compound X is known to be -477.7 kJ. The calorimeter constant of the bomb being used is 2500 j/degree celsius and the initial temperature of the water is 23.2 degrees celsius. a) if 22.54 g of compound X (MM=46.0) is burned ...
February 15, 2010

5th grade language arts
could someone give me some examples of entertaining sentences?
February 9, 2010

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