# Posts by Samantha

Total # Posts: 1,673

**chemistry**

Can someone please explain to me how to find the energy released? Given the overall reaction that takes place when hydrogen is burned in a young star, how much energy in MeV is released per He nucleus formed? masses: 1-H atom= 1.007amu 4-He atom= 4.002 amu positron = 5.485e-4 ...

*September 19, 2014*

**Pre-Calculus**

it says webpage not found

*September 19, 2014*

**Chemistry**

244pm

*September 14, 2014*

**Algebra 3-4**

The first stage of a rocket burns 28 s longer than the second stage. If the total burn time for both stages is 152 s, how long does each stage burn? Describe how you found your answer. I was originally thinking to divide 152 by 2 then add 28, but I realized that wouldn't ...

*September 12, 2014*

**Physics**

An object has a initial velocity of 10 m/s in the positive x direction. Under a constant acceleration it stops after undergoing a displacement of 148.3 m in the positive x direction. Because it is still under the same acceleration it then travels back in the negative in the x ...

*September 3, 2014*

**Math, Calculus**

0.00695

*September 2, 2014*

**Math**

Why does Zara have a good driving record?

*September 1, 2014*

**math**

Yooyoullylyl

*August 20, 2014*

**algebra**

is 3.27 a rational or irrational number

*August 6, 2014*

**college statistics**

The CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees (n = 474) and their starting salaries. The study collected current and beginning salary data for each of the 474 employees and the researcher conducted a ...

*July 20, 2014*

**science**

A runner whose mass is 49 kg accelerates from a stop to a speed of 6 m/s in 3 seconds. (A good sprinter can run 100 meters in about 10 seconds, with an average speed of 10 m/s.) (a) What is the average horizontal component of the force that the ground exerts on the runner'...

*July 17, 2014*

**physics**

An object with mass 110 kg moved in outer space. When it was at location < 11, -35, -7 > its speed was 17.5 m/s. A single constant force < 230, 420, -230 > N acted on the object while the object moved to location < 16, -41, -13 > m. What is the speed of the ...

*July 5, 2014*

**math**

Mike's number is 2000 more than Jerry's which is 400 less than Barry's. Larry's number is 1500 more than Sam's, which is 443. Sam's number is 60 less than Barry's. WHat is each boy's number?

*June 17, 2014*

**math**

Mike's number is 2000 more than Jerry's which is 400 less than Barry's. Larry's number is 1500 more than Sam's, which is 443. Sam's number is 60 less than Barry's.

*June 17, 2014*

**algebra**

A pet boarding facility wants to build two adjacent pens of equal size. They are using the length of the dog kennel as one side of the two pens. They have 324 feet of fencing to build the pens. What width should he make the pens to maximize the total area of the pens?

*May 31, 2014*

**Math**

When rolling a standard number cube twice, what is the probability of rolling two even numbers? I'm pretty sure the answer is 1/4, but the solutions says that this is wrong.

*May 24, 2014*

**statistics**

A pop-music record firm wants the distribution of lengths of cuts on its record to have an average of 129 seconds and a standard deviation of 10 seconds so that disc jockeys will have plenty of time for commercials within each 5-minute period. The population times for cuts is ...

*May 17, 2014*

**Statistics**

A brewery's filling machine is adjusted to fill bottles with a mean of 33.8 oz. of ale and a variance of 0.005. Periodically, a bottle is checked and the amount of ale noted. (b) Let's say you buy 93 bottles of this ale for a party. How many bottles would you expect to...

*May 12, 2014*

**Calculus**

1. If y′= x(1+ y) and y > -1 , then y= A) y=sinx B) y=3x^2+C << C) y=Ce^1/2x^2-1 D) y=1/2e^x^2+C E) y=Csq(x+3) 2. If dy/dx = x cos x^2 and y = −3 when x = 0, when x = π, y = ___. A) -3.215 B) √2 << C) 1.647 D) 6 E) 3π 3. Suppose an ...

*May 9, 2014*

**Calculus**

1) yy'-e^x= 0, and y=4 when x=0 means that: A)y=x-lnx^2+4 B)y^2=4x^2+3 C)y=-2x+1/2x^3 D)y^2=2e^x+14 E)1/2ln|x^2+4|+6 2) The rate of change of P with respect to t is directly proportional to (10-t) and inversely proportional to the cube root of P. The differential equation ...

*May 9, 2014*

**Calculus**

Which of the following is a separable, first-order differential equation? A) dy/dx= x+y/2x B) dy/dx=x+y/x-y C) dy/dx=sinx << D) dy/dx=xy/x+y E) dy/dx= 2lnxy 2) The differential equation dy/dx=y/x^2 has a solution given by: A) y=C sqrt(x^2+4) B)y=C e^-1/x C)-1/2ex^2+C D) ...

*May 8, 2014*

**Calculus**

Thank you!!

*May 6, 2014*

**Calculus**

The region R is bounded by the x-axis, x = 1, x = 3, and y = 1/x^3 A) Find the area of R B) B. Find the value of h, such that the vertical line x = h divides the region R into two Regions of equal area.

*May 6, 2014*

**Calculus**

Can someone check my answer? The change in the momentum of an object (Δ p) is given by the force, F, acting on the object multiplied by the time interval that the force was acting: Δ p = F Δt . If the force (in newtons) acting on a particular object is given by ...

*May 5, 2014*

**math**

15x5=75 82-75=7 Answer~7

*May 5, 2014*

**Chemistry**

Long question but its my last one for homework and im stuck on this word problem. Biomass is represented by the empirical formula C60H87O23N12P. Write a balance equation for the oxidation of C60H87O23N12P with O2 to form CO2, H2O, HNO3, and H3PO4 beginning with 1000g of ...

*May 4, 2014*

**Math**

22,000/400=55

*April 30, 2014*

**English**

He is not only a great baseball player ,but also a fine pianist. Which is correct (a) preposition ( b) adjective (c) correlative (d) adverb

*April 28, 2014*

**statistics**

The state bridge design engineer has devised a plan to repair North Carolina's 4420 bridges that are currently listed as being in either poor or fair condition. The state has a total of 13,168 bridges. Before the governor will include the cost of this plan in his budget, ...

*April 26, 2014*

**Math 10**

Hello, I did this question for homework, but my teacher said it was wrong and she didn't explain how it was supposed to be done. So could you please tell me how I am supposed to do this step by step? "A baseball is thrown from the top of a building and falls to the ...

*April 13, 2014*

**CALCULUS problem**

There are four parts to this one question, and would really appreciate if you could show and explain how you get to the answer, because I tried looking up how to find the answer myself, but nothing made sense. Thank you! 11. The region R is bounded by the x-axis, x = 1, x = 3...

*March 27, 2014*

**Math**

Jack bought a sweater at the sale price of $25. The original cost of the sweater was $40. What percent represents the discount that he received when buying the sweater?

*March 20, 2014*

**physics**

A soccer player kicks a ball straight up into the air at 6m.s per second.Ignore air friction. 1.What is the height of the ball at its highest point 2.What is the ball's acceleration at its highest point 3.Calculate the maximum height reached by the ball

*February 11, 2014*

**physics**

A soccer player kicks a ball straight up into the air at 6m.s per second.Ignore air friction. 1.What is the height of the ball at its highest point 2.What ie the ball's acceleration at its highest point 3.Calculate the maximum height reached by the ball

*February 11, 2014*

**Chemistry**

It says 8. In a similar experiment Mary Moreorlesss was to determine the loss of weight when a crucible of potassium chlorate was heated to drive off the oxygen. After finishing the experiment she concluded the potassium chlorate contained 24.0% oxygen. Why did miraculous(...

*February 6, 2014*

**science(CHECK ANSWERS)**

I took this quiz and the answer is B

*February 5, 2014*

**Social studies**

No I don't understand...

*January 24, 2014*

**Social studies**

Imperialism is to take over

*January 24, 2014*

**Social studies**

How is imperialism and the Spanish America war related?

*January 24, 2014*

**math**

What does "give a brief explanation as to what kind of solution(s) you expect the linear equation to have: 18x+1/2=6 (3x+25). Transform the equation into a simpler form if necessary" mean?

*January 23, 2014*

**math**

What does "give a brief explanation as to what kind of solution(s) you expect the linear equation to have: 18x+1/2=6 (3x+25). Transform the equation into a simpler form if necessary" mean?

*January 23, 2014*

**science... PLEASE HELP!**

Could that really be an experiment?

*January 23, 2014*

**history**

What are 2 reasons why people moved to the west?

*January 21, 2014*

**math**

A triangle has angles described as followed: the first angle is four more than seven times a number, another angle is four less than the first and the third angle is twice as large as the first. What are the sizes of each angle. I got the first angle of the triangle but I am ...

*January 17, 2014*

**math**

I do not understand...

*January 17, 2014*

**math**

What does "its supplement is twice as large" mean?

*January 17, 2014*

**math... PLEASE HELP!!**

The measure of one angle is described as twelve more than four times a number. Its supplement is as twice as large. Find the measure of each angle using an equation.

*January 17, 2014*

**math**

Solve the linear equation: x+x+2+x+4+x+6=-28. State the property that justifies your first step and why you chose it. When I solved the equation I got the answer of ×=-10. However, I do not know what the property I need to state for my first step. Isn't it ...

*January 16, 2014*

**science... PLEASE HELP!**

What are 5 examples of oganisms that are in the Prostista Kingdom?

*January 15, 2014*

**science**

That's the question, it doesn't give any more info. Here is the info: Density of water is 1.o g/cm3 Mass of a penny is 2.5 grams

*January 14, 2014*

**science**

Mercury, a metal that is liquid at room temperature, has a density 13.5 times the density of water. How many pennies could your boat hold if we were floating it in mercury instead of water?

*January 14, 2014*

**math**

When the problem says "Angel transformed the following equation from 6x+4-×=2 (×+1) to 10=2 (×+1). He then stated that the solution to the equation is ×=4. Is he correct? Explain" when I solved the equation I got 24=10 and 10=10. However, im ...

*January 14, 2014*

**math**

When the problem says "Angel transformed the following equation from 6x+4-×=2 (×+1) to 10=2 (×+1). He then stated that the solution to the equation is ×=4. Is he correct? Explain" when I solved the equation I got 24=10 and 10=10. However, im ...

*January 14, 2014*

**math**

If the problem says "the sum that shows how many pages Maria read if she read 45 pages of a book yesterday and 2/3 of the remaining pages today." Would the expression/equation be 45 + (2/3)n ?

*January 13, 2014*

**math**

Okay, but I have one question. When it says twice the sum how does that look like? Wouldn't it be ____ + ____^2 ?

*January 13, 2014*

**math**

What would the expression be if the problem was "the sum of four consecutive numbers." ?

*January 13, 2014*

**math**

Correction: what would be the equation if the problem was "The cube of a positive number divided by the square of the same positive number." ?

*January 13, 2014*

**math**

What wouldnthenequation benif thenproblem was "The cube of positive number divided by the square of the same positive number." ?

*January 13, 2014*

**biology**

Can someone help? I don't understand gene regulation. The regulation of protein synthesis in cells involves the coordination of several different mechanisms. Discuss TWO of the specific mechanisms of gene regulation in eukaryotic cells from the list below and describe how ...

*January 13, 2014*

**Math**

Which equation represents the sentence ‘‘d is 17 less than the quotient of n and 4”?

*January 12, 2014*

**Math**

Which function rule can be used to represent the area of a triangle with a base b 8 in. longer than twice the height h in terms of the height?

*January 12, 2014*

**AP U.S History**

Explain why Britian finally decided against on behalf of the Confeder.

*January 12, 2014*

**4 CALCULUS study problem**

Never mind! I solved them all and got them right. :)

*January 9, 2014*

**4 CALCULUS study problem**

1. How fast does the radius of a spherical soap bubble change when you blow air into it at the rate of 15 cubic centimeters per second? Our known rate is dV/dt, the change in volume with respect to time, which is 15 cubic centimeters per second. The rate we want to find is dr/...

*January 9, 2014*

**LAW**

I would say 2 is A. I am checking on number 1.

*January 9, 2014*

**science... PLEASE HELP!**

Is Archaebacteria autotrophic or heterotrophic? Also, is it unicellular or multicellular? I believe it is both autotrophic and heterotrophic and it is multicellular, but I am not sure. Please help!

*January 6, 2014*

**P.E /.....**

are you sure? This is important

*December 21, 2013*

**P.E /.....**

Ok never mind I figured that too lol. I have this question Im really stuck on Justine would like to improve her speed while dribbling the soccer ball from the defensive to the offensive side of the field. Justine can develop her speed for this type of activity by practicing ...

*December 21, 2013*

**P.E /.....**

Two 14-year-old competitive dancers are excited about the upcoming state championships. Their routine has a lot of moves packed into a two minute song the partners execute together. The routine has them covering all four corners of the dance floor in that short time period. ...

*December 21, 2013*

**P.E /.....**

Thank you Ms.Sue, but I figured that question out. Will you help me with another?

*December 21, 2013*

**P.E /.....**

PLZ PLZ PLZ HELP. Trying to get over quiz Harvey has his heart set on making the state finals for his track team in the 100 yard dash. Although Harvey knows there are many factors to improving his time and becoming an elite sprinter, one skill is paramount to his success. ...

*December 21, 2013*

**Connexus P.E**

Harvey has his heart set on making the state finals for his track team in the 100 yard dash. Although Harvey knows there are many factors to improving his time and becoming an elite sprinter, one skill is paramount to his success. This skill is used at the very beginning of ...

*December 21, 2013*

**Last two CALC questions. :)**

8. If f(x) = sin(7 − 5x), find f′(π), which is the derivative at π: −0.754 −0.657 0 * 0.657 3.770 9. Given the function: g(x)={x+b, x<0 {cos(x), x≥0 Find the value of b, if any, that will make the function differentiable at x = 0. 0 1...

*December 20, 2013*

**Check a few more CALC questions, please?**

I feel pretty good on my answers. Are there any I got wrong? Thank you for the help! 1. If g(x) = tan (5x^2), then g′(x) = * 10x sec2(5x2) sec2(5x2) –10xsec(5x2)tan(5x2) 10sec2(5x2) 7xsec2(5x2) 2. The inflection point of the curve y = x4 − 8x3 + 24x2 + 7x &#...

*December 19, 2013*

**Calc help - check rest of answers, please?**

Nevermind, I figured them out! :) Thank you!

*December 19, 2013*

**Calc help - check rest of answers, please?**

Thank you so much! I'm getting number 7 as .9%, correct?

*December 19, 2013*

**Calc help - check rest of answers, please?**

4. Find the tangent line approximation, L(x), of f(x)=x^2/3 at x = 8. L(x) = 4/3x-20/3 L(x) = 2/3x+8 L(x) = 4(x-8) L(x) = 1/3x + 4/3 *L(x) = 4/3x - 8/3 5. A balloon is rising at a constant speed of 5 ft/sec. A boy is cycling along a straight road at a constant speed of 15 ft/...

*December 19, 2013*

**CALCULUS - Check my answers :)**

And 5 would be 25?

*December 19, 2013*

**CALCULUS - Check my answers :)**

Is number 4 the last one?

*December 19, 2013*

**CALCULUS - Check my answers :)**

I'd appreciate corrections for the ones I get wrong. :) Thanks! 1. Determine which of the following is true for the function f(x) = x^3 +5x^2 - 8x +3. I. f(x) has a relative minimum at x = 2/3. II. f(x) has a relative maximum at x = 2/3. III. f(x) has a zero at x = 2/3 I ...

*December 19, 2013*

**Algebra**

During a softball game, a batter hits a ball upward from an initial height of 3 feet. The height, in feet, of the softball is given by s(t)=−16t^2+70t+3 , where t is time in seconds and . Which is closest to the time when the softball will be 50 feet above the ground?

*December 5, 2013*

**Geometry**

A softball player asked her father to make her a home plate for a softball game. According to her encyclopedia, an official plate is made from a square by making two 12-inch diagonal cuts upward from both bottom corners. What is the length of the side of the original square?

*December 4, 2013*

**English**

What does it mean to be a "critical reader?" Why is this important?

*December 3, 2013*

**Statistics**

smith is a weld inspector at a shipyard. he knows from keeping track of good and substandard welds that for the afternoon shift 5% of all welds done will be substandard. If Smith checks 300 of the 7500 welds completed that shift, would it be unusual for Smith to find 30 or ...

*December 1, 2013*

**Physical Science**

Why is it important when calculating the distance to extremely distant stars using parallax, astronomers use incredibly accurate instruments?

*November 26, 2013*

**AP World History**

Compare the position of upper-class women in classical Indian, Chinese, Greek, and Roman societies with regard to their ability to hold property, opportunity to pursue careers outside the home, rights in marriage and divorce, and level of education? hey! this is for an essay, ...

*November 25, 2013*

**Geometry**

Three vertices of a kite are (1,8), (1,0), and (4,6). What is the fourth vertex?

*November 24, 2013*

**Physics**

A steel (Young's modulus 2.0 x 1011 N/m2) wire is strung between two supports attached to a ceiling. Initially, there is no tension in the wire when it is horizontal. A 98-N picture is then hung from the center of the wire, as the drawing illustrates, so the ends of the ...

*November 23, 2013*

**Physics**

A 61-kg snow skier is being pulled up a 14 ° slope by a steel (Young's modulus 2.0 x 1011 N/m2) cable. The cable has a cross-section area of 7.0 x 10-5 m2. The cable applies a force to the skier, and, in doing so, the cable stretches by 2.1 x 10-4 m. A frictional ...

*November 23, 2013*

**Physics**

A 68-kg water skier is being pulled by a nylon (Young's modulus 3.7 x 109 N/m2) tow rope that is attached to a boat. The unstretched length of the rope is 15 m and its cross-section area is 1.8 x 10-5 m2. As the skier moves, a resistive force (due to the water) of ...

*November 23, 2013*

**Science**

So does VIBGYOR mean Violet, Indigo, Blue, Green, Yellow, Orange and Red?

*November 22, 2013*

**Science**

What does it mean, when it says "for visible light (ROYGBIV) which has the shortest wavelength? which has the longest? place all other colors in order based on their wavelength from shortest to longest.

*November 22, 2013*

**Social Studies (History)**

What was a result of the laissez-fair economic policies followed by the Federal Government between the Civil War and 1900?

*November 22, 2013*

**Geometry**

The coordinates of the endpoints of the hypotenuse of a right triangle are (7, 5) and (3, 1). Find the other vertex. There are two possible solutions.

*November 22, 2013*

**Statistics**

The effectiveness of a headache medicine is tested by measuring the intensity of a headache in patients before and after drug treatment. The data consist of before and after intensities for each patient. Identify the design of the study. A) Paired t-test B) Two-sample t-test C...

*November 21, 2013*

**Statistics**

A researcher wished to test the effect of the addition of extra calcium to yogurt on the "tastiness" of yogurt. Two different yogurts, one with extra calcium and one without the added calcium, were created from the same batch of yogurt. A group of 84 adult volunteers...

*November 21, 2013*

**Geometry**

Name all of the possible different rays that can be formed from the three points below: A B C <_______________>

*November 21, 2013*

**Statistics**

Most people are definitely dominant on one side of their body - either right or left. For some sports being able to use both sides is an advantage, such as batting in baseball or softball. In order to determine if there is a difference in strength between the dominant and non-...

*November 20, 2013*

**Statistics**

A packing company investigates a national training consultant in hopes of improving productivity on the packing line. The national consultant agrees to work with 18 employees, collecting productivity data for each employee before the training program and after the training ...

*November 20, 2013*