# Posts by Leah

Total # Posts: 504

**Statistics**

There were two independent groups who took a school course by different modes. The first sample of students took the course in the online and the second sample took the course in the conventional face to face mode. Using the sample data determine if there is significant ...

**Physics**

Suppose the block is released from rest with the spring compressed 5.50 cm. The mass of the block is 1.60 kg and the force constant of the spring is 965 N/m . Assume the surface is frictionless. A) What is the speed of the block when the spring expands to a compression of only...

**D/dt**

Thank you for the equation and the useful article. :) So this is what I get. f(t) dt= 2(0)- [sqrt(t^2+1) * 2t] f(t) dt= -sqrt(t^2+1) *2t Is this correct? Thank you so much. :-)

**D/dt**

Calculate d/dt when a=t^2, b=2 and sqrt(x+1)dx. My answer turns out to be incorrect despite my checking it several times. I got -2/3t* sqrt(t^2+1) Can someone explain to me what is wrong with my answer and how to go about obtaining it the right way? Thank you everyone. :-)

**Language Arts**

Which sentence below has a missing antecedent? A Many people are planning to attend the race, so we should get to the park early. B My parents are both swimmers, so I know a lot about it. C When Steven and Patrick went to the movies, he bought the tickets. Is it B??

**LIFE ORIENTATION**

identify and describe 3 environmental health hazard that cause ill health within your community and include evidence that is current if the identified issues.use graphs ,statistics, pictures

**Math**

Stuart needed to purchase cleaning supplies for his company. He purchased 15 rolls of paper towels for $0.65 each, 15 bottles of cleaning solution for $1.25 each, 4 containers of garbage bags for $2.45 each and 3 new mops for $6.98 each. He received a 15% discount using his ...

**MATH**

30

**Chemistry**

Figured it out, it is 11. :)

**Chemistry**

If the Kb of a weak base is 1.5 × 10^-6, what is the pH of a 0.25 M solution of this base? I found that I need to use the quadratic equation but I'm having difficulties because I come up with taking the square root by zero and that isn't right. Please help! a=1, ...

**MATH**

THE AREA OF A RECTANGUALR GARDEN IS 240 SQ FT. IF THE LENGTH OF THE GARDEN IS 20 FT.,WHAT IS ITS WIDTH?

**MATH**

THE AREA OF A RECTANGUALR GARDEN IS 240 SQ FT. IF THE LENGTH OF THE GARDEN IS 20 FT.,WHAT IS ITS WIDTH?

**MATH**

THE AREA OF A RECTANGUALR GARDEN IS 240 SQ FT. IF THE LENGTH OF THE GARDEN IS 20 FT.,WHAT IS ITS WIDTH?

**MATH**

THE AREA OF A RECTANGUALR GARDEN IS 240 SQ FT. IF THE LENGTH OF THE GARDEN IS 240 FT.,WHAT IS ITS WIDTH?

**English**

ok thank you!

**English**

Please help with this question that has been bothering me! I take bio college class and we have graduate/student assistant for labs & when taking an exam. The professor is never there during those sections.Due to my low exam results,I feel I'm not being graded on fairly ...

**Trigonometry**

Hi, I really need help in understanding how to solve trig equations. How do you solve this equation? Solve the equation on the interval 0 < or equal to x < or equal to 2pi. sinx = (square root of 3)/2 I appreciate your help. Thank you!

**Physics**

You are standing on top of a building that is 75-m high and you throw a 4-kg stone horizontally at a speed of 6.6-m/s. How far from the base of the building will the stone land? (the ground is flat)

**Chemistry**

Need help on a lab results write-up. The lab is the synthesis and analysis of a transition metal complex. General reaction was stated as: Fe(III) + x(acac) -> Fe(acac)x - we were to determine x by completing experiment. x = 1, 2, 3, 4... acac = 2, 4 pentanedione Procedure ...

**Chemistry**

what are the products when water,ferric chloride and ammonium thiocyanate are combined?

**English**

1. linking verb? 2. objective complement? 3. compound predicate nominative? 4. complete subject? 5. gerund phrase? 6. appositive phrase? 7. noun clause? 8. adverbial clause? 9. independent clause?

**English**

Identify the term that best describes the words/phrases in parentheses. 1. The teacher asked her pupils to (stay) put during the screening of the documentary. linking verb action verb 2. The committee judged the logo (the most appropriate symbol) for the association’s ...

**biology**

how can u investigate sugars or starch in a banana

**Math**

John is using a pulley to lift the sail on his sailboat. The sail weighs 150 N, and he must lift it 4.0 m. a. How much work must be done on the sail? b. If the pulley is 50% efficient, how much work must John do on the rope to lift the sail?

**Math**

A river does 6,500 J of work on a water wheel every second. The wheel's efficiency is 12%. a. How much work in joules can the axle of the wheel do? b. What is the power output of the wheel in 1 s?

**Physical Science**

When you do 100 J of work on the handle of a bicycle pump, the pump does 40 J of work pushing the air into the tire. What is the efficiency of the pump?

**Math 9**

sorry i meant 2.07 m or 207 cm

**Math 9**

so the answer would be 2.07 m or cm

**Math 9**

Please help me on this question. Thanks! One pole measured 1.35m and the smaller pole measured 0.83m. They needed to be tied together. They were attached by overlapping the ends and tying them together. The length of the overlap was 12cm. What is the total length of the new ...

**Physics**

Elena is correct for part a but for part b you need to subtract the tension for the answer. N=mg+ma-T = 287 + 287•0.38/9.8 -265 = 33.13 N

**Ashford University**

Evaluate the ways in which the legacy of slavery has prevented the United States from building a more just society, supporting your evaluation with the textbook and additional sources. Define what Dr. King’s refrain, “free at last,” looks like to you and how our...

**earth Geology**

This is just a question that I was curious about, why do mountain belts run parallel to coastlines? Thanks

**Physics**

At the beginning of a basketball game, a referee tosses the ball straight up with a speed of 5.4 m/s. A player cannot touch the ball until after it reaches its maximum height and begins to fall down. What is the minimum time that a player must wait before touching the ball? I ...

**chemistry grade 11**

A molecule of CHCl3 (chloroform), has the same shape as a molecule of carbon tetrahydride, CH4. But carbon tetrahydride’s boiling point is -164º C and chloroform’s boiling point is 62 ºC. Explain the difference between the boiling points of the two ...

**English/help**

Yesterday I posted three analogies, two I needed to know of they were correct, the other I was lost on, can someone take a look I have to go soon. Is the first one a comparison of Sandra and her fear to that of the kitten?

**English**

I am having trouble with finding the analogy in this one: sandra was sitting in the backyard avoiding the party. she jumped when she heard a noise but it was just a little gray ritten. he look even more scared of her and she was of him. He paused and then walk toward her ...

**Math**

Hi I am not good with math. Please tell me how to differentiate mixed numbers, order of operation,subtraction, divide and multiplication etc. Thanks!

**health**

what is intensity?

**English 4**

It's A.

**English 4**

Which of the following most distinguishes an epic from a mock epic? A. its subject matter B. its style C. its vocabulary D. its length I'm thinking its B.

**Health**

What physical symptoms often accompany social phobia? A. Difficulty talking B. Trembling C. Nausea D. All of the above help me please

**health**

What can spark weight concerns for girls and impact their eating habits in potentially unhealthy ways? A. High self-esteem B. Maintaining a healthy weight C. Peer pressure to look a certain way D. Positive reinforcement from parents about how one looks I need help pleaseee :(

**chemistry**

a current is passed through 500 mL of a solution of CaI2. the following electrode reactions occur: anode: 2I- ---> I2 + 2e- cathode: 2H2O + 2e- ---> H2 + 2OH- after some time, analysis of the solution shows that 35.7 mmol of I2 has been formed. a) how many faradays of ...

**Math/Trig**

How would I evaluate these trig functions without using a calculator? U: sin(-13π/6) cot 11π/6 cot(-14π/4) sec 23π/6 Thanks in advance ^^; and if you'd tell me step by step on how to do problems like these I'd be grateful :D

**world history**

of the Cold War, my bad ;D

**world history**

What are some political, economical, and social effects on the Cold War?

**Chemistry**

Explain how a barometer (mercury barometer) works using the kentic molecular theory

**Chemistry**

It requires 37.0 mL of a sodium hydroxide soltution to neutralize 0.75 grams of phosphoric acid. Using a balanced equation, determine the concentration of the sodium hydroxide solution.

**geometry**

The height of an equilateral triangular prism increases by one unit. The new lateral area is more than the original by how much? Answer the perimeter of the base the area of the base the height the area of one lateral face

**Physics**

A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that is 97.5 m from where it was hit. How high is the fence?

**Physics**

You are driving your car at a constant speed down the freeway. You are using 42 horsepower to do this. If the air resistance and frictional forces add up to 650 N, what is the net force on your car?

**Chemistry**

A saturated solution of sodium nitrate at 70oC is cooled to 40oC. How many grams of precipitate are formed?

**physics**

a 15 kg bucket is raised to paint a ladder with an acceleration of 3 m/s.^2 what is the tension in the rope?

**Math**

Verify the identity & Justify the step.s cot (theta-pi/2)=-tan theta

**Geometry**

1. An airplane is flying at 36,000 feet directly above Lincoln, Nebraska. A little later the plane is flying at 28,000 feet directly above Des Moines, Iowa, which is 160 miles from Lincoln. A.assuming a CONSTANT rate of descent, what was the angle of descent? B. What is the ...

**Math**

The perimeter of a regular pentagon is 35in. What is the lenght of one side of the pentagon? Show your work.

**English**

Please help write a reaction on this Article, I want to give good presentation. How can I make it interesting? Thank you! So, far I think the Author is Energy literate and motivates readers through his words. Please tell me how I can include "Energy conversion, Energy ...

**algebra**

If a rocket is launched with an initial velocity of 1600 feet per second when will the rocket be 14400 feet high?

**chemistry**

A closed container with a mixture of hydrogen, helium, and argon has a total pressure of 2.90 atm. The partial pressure of hydrogen is 0.500 atm and the partial pressure of argon is 760. mm Hg. What is the partial pressure of helium?

**Physics**

A person pushes a 11.0 kg lawn mower at constant speed with a force of 76.0 N directed along the handle, which is at an angle of è = 41.0° to the horizontal. Calculate the normal force exerted vertically upward on the mower by the ground. Calculate the force the ...

**Physics**

A heavy-duty stapling gun uses a 0.162-kg metal rod that rams against the staple to eject it. The rod is pushed by a stiff spring called a "ram spring" (k = 32657 N/m). The mass of this spring may be ignored. Squeezing the handle of the gun first compresses the ram ...

**Physics**

A constant torque of 27.2 N · m is applied to a grindstone for which the moment of inertia is 0.158 kg · m2. Find the angular speed after the grindstone has made 18 rev. Assume the grindstone starts from rest. Answer in units of rad/s

**algebra**

On the day a child was born, a lump sum P was deposited in a trust fund paying 6.5% interest compounded continuously. Use the balance A of the fund on the child's 29th birthday to find P. (Round your answer to the nearest cent.) A = $5,000,000 P = $1

**English Lit**

Thanks for the great definitions- Do you think I was right on either of them? The first question slant rhyme and the secondcaesura?

**English Lit**

I have two questions about these Emily Dickinson's "Wild Night" 1.Which best describes the rhyme in the second stanza--internal rhyme,slant rhyme,feminine rhyme,descending rhyme or no rhyme Would it be slant rhyme? 2.Which is the following sound device used in ...

**penn foster world history**

i hope someone can help me as well.

**Pre-Calculus**

Thank you

**Pre-Calculus**

Can you show me how to find the rectangular equation: r=2cos(theta) + 3 sin (theta) All I need is an example to work off I was absent today from Pre-Calc and I have homework to do and no explanation with them-Please help with this one Thank you

**Pre-Calc**

Can you show me how to find the rectangular equation of r=2costheta + 3 sin theta All I need is an example to work off I was absent today from Pre-Calc and I have homework to do and no explanation with them-Please help with this one Thank you

**math**

A pair of sneakers cost s dollars. A pair of socks costs k dollars. If the store charges 5% sales tax, write an expression for the cost of one pair of socks and one pair of sneakers.

**Math**

Jan is on year younger than her brother Bill and on year older then her sister Sue. The sun of the three children ages is 57. How old is each child.k

**math**

Posted by kathy on Monday, September 26, 2011 at 8:05pm. 1.the square og 2 is the same as two times the difference of g and 10. 2. the product of 3 and the square of g equals the sum of thirty and the product of nine and g. i really need help on this i don't get it. thanks

**physics**

122

**Physics**

A book is moved once around the edge of a tabletop with dimensions 1.75m x 2.25m. If the book ends up at the initial position, what is its displacement? If it completes its motions in 23s, what is its average velocity? What is its average speed?

**Biomechanics**

How do you compute the additional work done after a stretch-chorten cycle?

**math**

A transformation T : (x, y) (x + 3, y + 1). The image of B(4, 1) under this transformation is

**Accounting**

purchased dental equipment at 15,000 and invested cash of 500,000

**math**

A transformation T : (x, y) (x + 3, y + 1). The image of B(4, 1) is

**math**

Indicate the equation of the line that is the perpendicular bisector of the segment with endpoints (4, 1) and (2, -5).

**math**

The slope of a line that is perpendicular to a line whose slope is -2/7 is

**geometry**

Indicate the equation of the line through (2, -4) and having slope of 3/5.

**geometry**

In rectangle ABCD, if the coordinates of A are (0, 0) and the coordinates of C are (r, s), find the coordinates of B.With A and D being on the bottom line and B and C on the top with B over A.

**math**

In rectangle ABCD, if the coordinates of A are (0, 0) and the coordinates of C are (r, s), find the coordinates of B.With A and D being on the bottom line and B and C on the top with B over A.

**Chemistry**

What type(s) of intermolecular forces allow CO2 to dissolve in water? Do CO2 and H2O have a relatively strong or weak attraction to one another? Explain. Please and thank you!!

**math**

a government bod pays 100 in a year at a discount rate of 5%(assume simple interest). How much did the bond cost? What is the annual percentage rate? Should it be more or less than 5%?

**writing**

Compare and contrast your abilities as an academic writer now as opposed to when you began your studies at the University. Using four comparatives and four superlatives within your responses, explain what has led to these changes and what changes you will make in the future.

**simplex Method**

A company manufactures two products, A and B, on two machines, I and II. It has been determined that the company will realize a profit of $3/unit of product A and a profit of $4/unit of product B. To manufacture 1 unit of product A requires 6 min on machine I and 5 min on ...

**Simplex Method**

Solve the linear programming problem by the simplex method. Maximize P = 27x + 27y + 36z subject to x + y + 3z < 15 4x + 4y + 3z < 65 x > 0, y > 0, z > 0 x + y = z = P =

**simplex Method**

Solve the linear programming problem by the simplex method. Maximize P = 5x + 4y subject to 3x + 5y < 78 4x + y < 36 x > 0, y > 0 x = y = P =

**Simplex Method**

Solve the linear programming problem by the simplex method. Maximize P = 10x + 6y subject to x + y < 80 3x < 90 x > 0, y > 0 x = y = P =

**geometry**

The perimeter of a triangle ABC is 58cm.The base of the right triangle is 17 cm. What is th area of the right triangle and how do you figure it out?

**HELPPP**

Solve the linear programming problem by the method of corners. Minimize C = 5x + y subject to x + 3y ≥ 43 x + y ≥ 27 x ≥ 0, y ≥ 0

**math**

Maximize P = 2x − 3y subject to x + 2y ≤ 14 6x + y ≤ 18 x ≥ 0, y ≥ 0

**Chemistry**

when 5.00 g of CaCl2 dissolves in 50.0g of water, what is the boiling point of the solution

**Math**

Which of the flowing formulas a correct rewriting of the formula a=6b - 12? A. b= a- 12/6 B. b= a + 12/6 C. b= a/6 + 12 D. b= 6a - 12

**math**

Formulate a system of equations for the situation below and solve. A theater has a seating capacity of 660 and charges $2 for children, $4 for students, and $6 for adults. At a certain screening with full attendance, there were half as many adults as children and students ...

**math**

Pivot the system about the element in row 2, column 1. –5 5 –7 10 4 4

**math**

pivot the system about the element in row 2, column 1: -5 5 l -7 10 4 l 4

**Chemistry**

A solution contains a mixture of Cl- and Br- ions. Can both be positively identified? Briefly explain and write appropriate equations to support your answer.

**math**

A = _,b = 12yd,h = 16 yd