Friday

April 18, 2014

April 18, 2014

Total # Posts: 68,174

**math**

15. which of the following figures will not tessellate the plane? a. rhombus b. equilateral triangle c. regular hexagon d. regular pentagon

**Social Studies**

Which of the following facts could be best used when supporting Kurdish independence? A. Most of the Kurdish people are not Shia Muslims, but are Sunni Muslims. B. Outside governments have repressed Kurds harshly before. C. Kurds were included in Iraq by the British when Iraq ...

**Social Studies**

Which of the following is a reason why Turkey is not as advanced as other European countries when considering the economy? A. A large part of the Turkish economy is agriculture. B. Turkey did not have enough trade barriers. C. Turkey does not have any natural resources. D. The...

**Social Studies**

Which question would be best to consider when researching the effects of oil in the Middle East? A. Why are there larger oil reserves in some countries compared to other countries? B. In which country in the Middle East are the largest oil reserves? C. How does oil shape the e...

**cost accounting**

Marvin’s Motors Company (MMC) manufactures outboard motors for use on small to medium sized boats. MMC produces three models: the Standard, the Deluxe and the Performance. The company uses a normal job costing system with manufacturing overhead applied on the basis of dir...

**Precalculus**

That one is for sec -1. The one I'm doing has sec + 1 on the bottom

**Precalculus**

Prove that the left side equals the right side Tan + sec -1 / tan -sec + 1 = tan + sec

**math**

Use the following to answer question 7: Point Bread Tractor A 20 0 B 18 1 C 14 2 D 8 3 E 0 4 Refer to the above schedule. Starting at point A, the opportunity cost of producing each successive unit of tractors is: a constant 2 units of bread 8, 6, 4, and 2 units of bread 2, 4,...

**TO ANY SCIENCE HELPER**

Ok, I kinda understand it now. Thank u so much :)

**TO ANY SCIENCE HELPER**

Like say my question was a sample has 80% of its original carbon-14 present. How do I determine the age of the sample? Like I don't get how to get the answer, this concept is very difficult for me

**Math**

An experiment involving learning in animals requires placing white mice and rabbits into separate, controlled environments, environment I and environment II. The maximum amount of time available in environment I is 500 minutes, and the maximum amour of time available in enviro...

**Math**

The Oscar Drapery Company makes three types of draperies at two different locations. At location 1, it can make 10 pairs of deluxe draperies, 20 pairs of better draperies, and 13 pairs of standard drapes per day. At location 2, it can make 20 pairs of deluxe drapes, 50 pairs o...

**physics**

A singly ionized helium atom is in the ground state. It absorbs energy and makes a transition to the n = 3 excited state. The ion returns to the ground state by emitting two photons. What are their wavelengths of a lower and higher energy photon?

**physics**

What is the de Broglie wavelength of a 5.0-eV electron?

**physics**

A laser emits 1.42 1018 photons per second in a beam of light that has a diameter of 1.82 mm and a wavelength of 524.0 nm. Determine each of the following for the electromagnetic wave that constitutes the beam. (a) the average electric field strength (b) the average magnetic f...

**physics**

The moon's diameter is 3.48 106 m, and its mean distance from the earth is 3.85 108 m. The moon is being photographed by a camera whose lens has a focal length of 48.5 mm. (a) Find the diameter of the moon's image on the slide film. (b) When the slide is projected onto...

**physics**

(m+1/2)/sin(theta) = d/lambda where m=1

**physics**

In a Young's double-slit experiment, the angle that locates the second dark fringe on either side of the central bright fringe is 7.2°. Find the ratio d/λ of the slit separation d to the wavelength λ of the light.

**Algebra**

The bar graph which is 4% whole mil, 8% milk for cream and 30% cream shows the milk fat percentages in three dairy product s. How many pounds each of whole milk and cream should be mixed to form 200 lb of milk for cream cheese?

**TO ANY SCIENCE HELPER**

I honestly don't get how to use radioactive dating to determine the age of a sample. I need an example and what to do in order to get the answer. I need it to be step by step. Thank u so much :)

**Math (Probability)**

Mina tosses two number cubes labeled 1 to 6. What is the probability that the sum is equal to 5? A. 1/36 B. 1/9 C.1/6 D.5/36

**Answer Check; Math**

I understand 7, but I don't get 12, 25/60 is 41.

**Answer Check; Math**

7. Sea turtles lay about 2,500 and 3,000 nests each year, and lay an average of 200 eggs per nest. Only 1 in 1,000 hatchlings will reach maturity. What percent will reach maturity. a. 10% b. 1% (my guess) c. .1% d. .01% 12. It took Mr. E 25 minutes to drive to St. Augustine, w...

**English Composition**

What would be 5 reasons parents won't let a kid go out alone with friends?

**math**

{Positive multiples of 4} (Enter your answers as a comma-separated list. Enter only the first three values of this set.)

**physics**

compute the kinetic energy of an 1800 lb automobile traveling at 30 mi/hr. how many times as great is the kinetic energy if the velocity is doubled? compute the kinetic energy, in erg and in joules, of a 2 gram bullet travelling at 500 m/sec.

**SS**

Yes, they apply, but I'm looking for things that can be given and traded, unlike most of the things listed.

**SS**

What are some things that Turkey has that Qatar doesn't?

**Radioactivity **

1. A granite rock is thought to be about 2 billion years old. why is it not possible to determine the age of the Rock using carbon-14 dating? 2. A hair sample has 80% of its original carbon-14 present. what is the age of the sample? 3. A bone fragment has lost 75% of its origi...

**SS**

How can Lebanon help in the development of the UAE (without the involvement of oil)?

**accounting**

A patent costing $500,000 was purchased on July 1. The company expects the patent to be useful for 5 years. How much amortization expense is reconized on December 31?

**SS**

If a country wants to help another country through foreign investment, what can it do? How can it do the foreign investment?

**Psychology/English**

Jane Eyre was orphaned as a child. What do you think is the psychological effect?

**SS**

What is foreign investment? Please explain in simple terms.

**trig**

a 725 pound trailer is sitting on a ramp inclined at 36 degrees. how much force is required to keep the trailer from rolling down the ramp??

**Math**

You throw a ball into the air with an initial vertical velocity of 31 feet per second. The ball leaves your hand when it is 6 feet above the ground. You catch the ball when it reaches a height of 4 feet. After how many seconds do you catch the ball?

**Trig**

thank you

**Trig**

Force 1= 65 pounds , Force 2=90 pounds find the angle between the forces? magnitude of the resultant force= 70lbs

**English Please Help!! **

I am trying add the tone to this passage to my essay. The "tone" is admiring her mother. I am drawing a blank and don't know what or where to add the tone. Passage: Lastly, Schultz shares that for a long time she was unable to look at the shells and that she buri...

**Chemistry**

Ethylamine, CH3CH2NH2, has a strong, pungent odor similar to that of ammonia. Like ammonia, it is a Brønsted base. A 0.10 M solution has a pH of 11.87. Calculate the Kb and pKb for ethylamine. What is the percentage ionization of ethylamine in this solution?

**Chemistry **

A 0.60 M solution of a weak acid, HA, has a pH of 3.72. What is the percentage ionization of the acid? What is the value of Ka for the acid?

**chemistry**

Which of the following statements is true concerning the titration of a weak base by a solution of hydrochloric acid? Question 9 options: At the equivalence point, the pH is 7. At the equivalence point, there is excess hydrochloric acid. At the equivalence point, the pH is det...

**Chemistry**

what is the pH of 0.80 M NaCN? What is the concentration of HCN in the solution?

**chemistry**

Baking soda is sodium bicarbonate (NaHCO3). When you heat baking soda, it breaks down into sodium carbonate powder (Na2CO3), water vapor, and carbon dioxide. The enthalpy of this reaction is 129 kJ. a. Write a correct, balanced thermochemical equation for this reaction. (Reme...

**chemistry**

a mixture of N2, O2 and Ar have mole fractions of 0.25, 0.65, and 0.10, respectively. What is the pressure of N2 if the total pressure of the mixture is 3.9 atm?

**Algebra**

3/(4x-36)- 5/(2x-4) - 2x/(x^2-11x+18) Simplify and expand the expression?

**math**

Show 1/5 of a set of 15 counters. How many counters?

**Math**

Hello I need help on this problem: The directions for lemonade say to put 2 cups of the, liquid concentrate into 1 gallon of water. If I want to make 1 pint of lemonade, how many fluid ounces should I use.

**SS**

How might attracting foreign investment help a country (the country receiving the investment)?

**trigonometry **

the angle of elevations from the top of the tree to the point on the ground is 63 yards from its base 45degrees. How tall is the tree?

**Math**

Bart won the jellybean estimation contest at his class Easter party he won 28 Easter stickers he gave 1/8 of the stickers to his friend rob how many stickers did he give rob

**Precalculus**

Two steps after multiplying the top and bottom, why does tan become 2tan on top

**Precalculus**

Verify: Tan u + sec u-1 / tan u - sec u+1 = tan u + sec u

**algebra**

A guy rope is attached to the top of a tent pole. The tent pole is 8 feet tall. If the guy rope is pegged into the ground 5 feet from the tent, how long is the guy rope?

**world geography**

In Caribbean, Puerto Rico and Jamaica are islands of the Lesser Antilles

**Chemistry**

Thank you so much for your help. It means the world!

**Chemistry**

so would it be n=4 since that is the largest outer shell ms= + 1/2, -1/2 since it has 2 electrons in 4s but what would happen if it was 3d? Would that be times by 5? and I'm still a little confused on what the two others represent. I'm sorry for being such a bother!

**Chemistry**

What does each stand for? So if I am doing it for fluorine, what would n, l, ml, and ms represent? For instance, is n the sublevel or what? I'm rather confused.

**Chemistry**

List all the quantum numbers for each of the 9 electrons in fluorine n L m sub L m sub s 1. 2. 3. 4. 5. 6. 7. 8. 9.

**Chemistry**

Astatine?

**Chemistry**

Which halogen has the lowest electron affinity?

**Language Arts**

So I answered a couple of the questions about "The Boarded Window" by Ambrose Bierce. But can you help me with this please? What in the text indicates the beliefs and values of the author?

**College Math**

F'(x) = 3(x^2 +4x +2/(x+2)^2 F'(x) = 5cos(5x + e^2) F'(x) = 6x(e^x) + e^x (6) = 6e^x (x +1)

**Math**

A boat must be moored 25 feet away from a dock. The boat will be 10 feet below the level of the dock at low tide. What is the minimum length of rope needed to go from the boat to the dock at low tide?

**Rectangular coordinates to polar coordinates**

1) I'm asked to find 2 sets of polar coordinates for the point for 0≤ θ< 2pi from a given pair of rectangular coordinates . For instance, one of the coordinates was (-3,4). I found r = plus and minus 5.Then θ= arctan (y/x)= arctan (4/-3)= -.9273 I know y...

**Radioactivity **

How are the terms "activity" and "becquerel" related? A radioactive isotope source has a mass of 120 g. If the isotope has a half life of 20 secs what would be the mass of the isotope in 2 mins?

**justin**

You require space to service 65 vehicles at any one time. Will a facility measuring 145 ft. by 130 ft. be adequate if each vehicle requires 300 sq.ft.?

**math**

You sell and service vacuum cleaners. Your price on a particular model is $125. However, to get a service contract, you offer to sell it for $115. How much discount are you giving as a percentage of price (to the nearest tenth)?

**Algebra**

One person can complete a task in 3 minutes. A second person can complete the same task in 5 minutes. How long will it take to complete the task of the two people work together?

**English: tragedy**

Paraphrase this line by line: I don't understand this.. In tragedy, man is a paradox in a paradoxical existence. Fallible and vulnerable in his mortal finity, he is yet capable of transcendent greatness. Freely exercising his will (a passive hero is pathetic rather than tr...

**Trig**

how do you find the standard form of 7(cos255degrees + isin255degrees) ?

**Math**

Given the total profit function P(x) = 1.3x-.01x^2-30, let x represent a number of days and find maximum profit achieved and when that profit is made. Then graph the function and mark the vertex

**Geometry- trig ratio**

25,636 ft?

**Geometry- trig ratio**

An observer (o) spots a plane flying at a 55 degrees angle to his horizontal line of sight. if the plane is flying at an altitude of 21,000 ft, what is the distance (x) from the plane (p) to the observer (o)?

**Social Studies**

I have worked on this assignment for days and I am just lost! Can't tell you how much I have researched it!

**Social Studies**

I am the Star Reporter who is going to visit George Washington at his home at Mount Vernon during the years of 1759-1774. I am interviewing him about his political and personal views, activities, goals, and predictions. Develop 10 questions to ask President Washington. Then t...

**college physics**

A reflecting telescope has a radius of curvature of 3m for its objective mirror and a radius of curvature of -1.5 for its eyepiece mirror. If the distance between the two mirrors is 0.90 m, how far in front of the eyepiece should you place the electronic sensor to record the i...

**reading**

Tom has difficulty battling distractions while studying. Which of the following strategies would help him with this problem?

**Geometry**

Elimination -12x -8y=-20 -3x +9y=-27

**science**

A car driver accelerates to a speed of 35 mph and then takes her foot off the pedal. Even though she does not press the brake pedal at any time, she eventually rolls to a stop. What causes that?

**Algebra 1 Explanation (Anyone, please!)**

Reiny's method is fine, but the "standard" method is like this: Find the vertex, which is the highest or lowest point of the parabola. Use -b/2a first. y = ax^2 + bx + c y = x^2 - 2x - 3 2/2 = 1, axis of symmetry. y = 1^2 - 2(1) - 3 y = 1 - 2 - 3 y = -4 Vertex: (...

**Grammar**

That's why some writers don't like the dashes. It can make a sentence really long without having to use standard punctuation (commas, colons, etc).

**math**

Compute the amount of interest earned in the following simple interest problem. A deposit of $8,000 at 9.5% for 120 days.

**math**

Zeller, Inc., has 60,000 shares of stock outstanding. Zeller declares a dividend of $580,000. What is the dividend per share?

**math**

Which of the following situations is an example of a linear function?

**math**

The account balance on April 1st is $50.51. On April 15th a payment of $15.00 is made. On April 25th a purchase of $19.27 is made. The annual rate is 18%. What is the finance charge using the previous balance method? What is the new balance?

**Precalculus**

1. Consider the curve y=x^2. a. write down (dy)/(dx) My answer: 2x The point P(3,9) lies on the curve y=x^2. b. Find the gradient of the tangent to the curve at P. My answer: 2*3=6 c. Find the equation of the normal to the curve at P. Give your answer in the form y=mx+c. My an...

**math**

Chris Shopper received a $800 discount loan to purchase a washer and dryer. The loan was offered at 10% for 120 days. What are the proceeds?

**calculus**

false

**c**

Yes, B.

**HELP!**

btw I took honors biology in 8th grade and this year I'm taking honors earth science. Usually you take honors chem at a sophomore if your an honors student but teachers can recommend you to AP.

**social studies**

How do the words dialect and heritage help understand European culture?

**math**

tameka draws a line that would cut a square in half. she says makes 2 smaller squares. is tameka correct? explain

**Physics**

Magnification=f/f-do m=6/6-2 m=1.5

**Physics**

A magnifying glass (a positive lens) with a focal length of +6 cm is placed 2 cm above a page of print. What is the magnification of this image?

**Math**

(6x4 – 3x + 5) – (3x4 + 4x3 – 6x2 + 1)

**M a t h**

A small plant manufactures riding lawn mowers. The plant has fixed cost (leases, insurance, etc.) of $48,000 per day and variable cost (labor, materials, etc.) of $1,400 per unit produced. The mowers are sold for $1,800 each. So the cost and revenue equations are y= 48,000 + 1...

**Social Studies**

I am the Star Reporter who is going to visit George Washington at his home at Mount Vernon during the years of 1759-1774. I am interviewing him about his political and personal views, activities, goals, and predictions. Develop 10 questions to ask President Washington. 1. What...

**trigonometry**

An angle measuring (468n)° is in standard position. For which value of n will the terminal side fall along the negative portion of the x-axis

**physics**

A hammer with 10 J of kinetic energy hits a nail and pushes it 5.0 mm into a plank. Both the hammer and nail come to rest after the collision. What is the average force that acts on the nail while it moves the 5.0 mm?

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