# crystal

Most popular questions and responses by crystal-
## calculus

the edge of a cube is increasing at the rate of .05 centimeters per second. in terms of the side of the cube s, what is the rate of change of the volume of the cube, in cm^3/sec

*asked on February 10, 2011* -
## 6th grade math

Please explain: Ursula wrote the sum of 5.815 + 6.021 as a sum of two mixed numbers. What sum did she write? Compare the sum of the mixed numbers to the sum of the decimals? Please explain.

*asked on August 31, 2015* -
## math

how many ways can you make 75 cents with quarters, dimes, and nickels

*asked on June 9, 2010* -
## Math

Use the rated acute angle to state an equivalent expression Tan110 The answer is tan290. Why isn't it 70? Please explain

*asked on November 24, 2012* -
## 6 th grade SS

Can you check my answer What do you think the political and economic future of Cyprus will be like? The future of Cyprus will be a future governed by a new and different governmental and political structure. Like focusing on the economy instead of the

*asked on December 2, 2015* -
## Math

how did farmer john find his missing cow? How did the cow get over the block of hay?

*asked on August 28, 2013* -
## Physics

Twelve identical point charges are equally spaced around the circumference of a circle of radius 'R'. The circle is centered at the origin. One of the twelve charges, which happens to be on the positive axis, is now moved to the center of the circle. Part

*asked on February 3, 2011* -
## Math

The value of a car after it is purchased depreciates according to the formula v(n)=28000(0.875)^n where v(n) is the car's value in the nth year since it was purchased. How much value does it lose in its fifth year? The answer is $2052 but I don't see how;

*asked on November 12, 2012* -
## science

Written out, would the reaction between anihiline [C6H5NH2] and perchloric acid look like this: C6H5NH2 + HClO4 -> C6H5ClO4 + HNH2 ? The NH2 group on aniline is basic. It takes on a H^+ from HClO4 and forms the salt. The salt is C6H5NH3^+ + ClO4^-. I hope

*asked on October 19, 2006* -
## History 108 (paper due tonight)

What were the social economical and political changes brought on by the Ming and Qing Dynasties? I have a minimally descriptive online source and of course my book. I was wanting to know more about the reform that actually took place upon the ming and Qing

*asked on July 12, 2009* -
## Fixed Critical analysis essay

In "Phenomenal Woman" by Maya Angelou, the speaker is advising all women to be self-confident no matter what others say, or think. The theme that Angelou portray's is that it's better to be yourself, than trying to act like a different person. In this poem

*asked on November 25, 2009* -
## Brain freezer a.k.a. MATH

What does a scale factor between two similar figures tell you about the relationships between the length and area measures of the figures? The relationship is that you use the l&w to find the scale factor. you can make L&W ratios for each figure, then you

*asked on January 4, 2007* -
## Math

If a bag contains 12 apples, 4 bananas, and 8 oranges, what is the part to whole ratio of bananas?

*asked on December 10, 2015* -
## Chemistry

Phthalic acid, H2C8H404, is a diprotic acid used in the synthesis of phenolphthalein indicator. Ka1= 1.2x 10^-3, and Ka2 = 3.9 x 10^-6. a) Calculate the hydrongen-ion concentration of a .015 M solution. b) What is the concentration of the C8H4O4^2- ion in

*asked on November 29, 2016* -
## Chemistry

A mixture of C3H8 and C2H2 has a mass of 2.0g . It is burned in excess O2 to form a mixture of water and carbon dioxide that contains 1.6 times as many moles of CO2 as of water. Find the mass of C2H2 in the original mixture.

*asked on October 20, 2012* -
## Proofread my Critical Analyis essay

My critical Analysis essay is over the poem "Phenomenal Woman," by Maya Angelou. Before you begin reading it I've typed directions. When you finish it could you please give me a letter grade. I'm a 10th grader. Thanks so much have a blessed Thanksgiving.

*asked on November 25, 2009* -
## Physics

A ferry is crossing a river. The ferry is headed due north with a speed of 1.7 m/s relative to the water and the river’s velocity is 2.4 m/s to the east. a) What is magnitude of the boat’s velocity relative to Earth? Answer in units of m/s b) Find the

*asked on October 8, 2012* -
## Poem: Annabel Lee by Edgar Allen Poe

Could you check these answers that go with the poem? Thanks 1. After reading "Annabel Lee," what images linger in your mind. Answer: The images that linger my mind are the kingdom by the sea, her grave by the sea, and the great love the two both shared. 2.

*asked on January 24, 2009* -
## chemistry

Calculate the pH values and draw the titration curve for the titration of 500 mL of 0.010 M acetic acid (pKa 4.76) with 0.010 MKOH. Calculate the pH of the solution after 490 mL of the titrant have been added. Calculate the pH of the solution after 500 mL

*asked on February 3, 2017* -
## chemistry

Thallium(I) hydroxide is a strong base used in the synthesis of some organic compounds. Calculate the pH of a solution containing 2.13 g TlOH per liter.

*asked on August 8, 2008* -
## Math

Determine the sum of the first seven terms of the geometric series in which ... F) t5 = 5 and t8 = -40 I'm stuck on this one!

*asked on January 12, 2013* -
## chemistry

What are the the missing reactants for the double-displacement reaction that produces PF5 and AsCl3 ?

*asked on January 2, 2012* -
## Chemistry

How do I write ZnSo4(aq)+Na3Po4(aq)---> Zn3(Po4)2(s)+Na2S04(aq)as a net ionic equation balanced?

*asked on October 9, 2012* -
## English

Which of the following phrases would be reworded by paraphrasing? Select one: a. religious tolerance b. federal government c. drunk-driving charges d. plethora of beings

*asked on November 15, 2018* -
## Math

I can't figure out this one question... A ship is docked in port and rises and falls with the waves. The function d(t) = 2sin(30t)°+5 models the depth of the propeller, d(t), in metres at t seconds. e) within the first 10 seconds, at what times is the

*asked on December 16, 2012* -
## math

The pressure on a scuba diver at sea level is 14.7 pounds per sq inch (psi). The pressure increases 0.445 psi for each foot of depth. Suppose the pressure on a diver is 41.4 psi. How deep is she?

*asked on September 11, 2013* -
## Psychology- Assessments

In comparison to the ______________ model, the _____________ model assesses the complexities of learning disabilities better than a one-step process where an individuals is tested once and diagnosed. a. discrepancy; Response to Intervention b. Response to

*asked on August 23, 2013* -
## chemistry

The density of a gas is 2.0 grams per liter at STP. Its molar mass is approximately?

*asked on March 5, 2009* -
## Algebra

a spinner used for a game is divided into sections: yellow, green, and orange. Janie spins the spinner 20 times. The spinner lands on green 8 times. What is the experimental probability that the spinner does not land on green?

*asked on March 21, 2016* -
## Math

Determine the sum of the first 20 terms of the arithmetic sequence in which ... f) the 7th term is 43 and the 13th term is 109 I know you can make two equations : 43 = a + 6d and 109 = a + 12 d And subtract them to get d = 11 But I know there's another way

*asked on January 12, 2013* -
## physics

A hair dryer uses 10A at 120V. It is used with a transformer in England, where the voltage is 240V. A. What should be the ratio of the turns of the transformer? B. What current will the hair dryer now draw?

*asked on February 28, 2011* -
## Poem: Incident in a rose garden: By Donald Justice

Could someone please check my answers to the poem thanks. 1. How does the gardener recongize Death? Answer: The gardener recognizes death as a dressed spanish waiter. 2. Why is the gardener afraid of Death? Answer: The gardener is afraid of death because

*asked on January 24, 2009* -
## English

1. What does Quindlen call feeding babies, walking dogs, and doing household jobs? A. difficult chores B. simple daily routines C. well-paid occupations D. enjoyable pastimes 2.What group of people does Quindlen decide are “correct” in their views? A.

*asked on June 9, 2012* -
## physics

A meter stick lies on the bottom of a 100 cm long tank with its zero mark against the left edge. You look into the tank at an angle of θ = 24°, with your line of sight just grazing the upper left edge of the tank, and h = 32 cm. (a) What mark do you see

*asked on September 10, 2011* -
## Math

A farmer has 230 ft of fence to enclose a rectangular garden. What is the largest garden area that can be enclosed with the 230 ft of fence? Explain your work.

*asked on February 20, 2010* -
## Poem: The road not taken by Robert Frost

Could you check these answers thanks. 1. Where do Frost's roads diverge? Answer: Frost's roads diverge in a yellow wood. 2. Which road did the speaker in Frost's poem choose? Answer: The speaker chose the road that was less traveled by. 3. In Frost's poem

*asked on January 25, 2009* -
## physics

2. Saturn has a radius of about 9.0 earth radii, and a mass 95 times the Earth’s mass. Estimate the gravitational field on the surface of Saturn compared to that on the Earth

*asked on January 11, 2012* -
## math 1025

find the interest. round to the nearest cent $290 at 8.8% for 3 months

*asked on December 9, 2016* -
## 7th grade math

A plumber has a very long piece of pipe that is used to run city water parallel to a major roadway. The pipe is cut into two sections. One section is 12 ft. shorter than the other. If 34 of the length of the shorter pipe is 120 ft., how long is the longer

*asked on November 6, 2016* -
## Psychology-Assesment

According to Cattell, a person trying to solve an entirely new kind of problem is using his or her__________, whereas a person working on a task that he or she knows well is using his or her ________ a. general ability, specific ability b. intelligence B,

*asked on August 23, 2013* -
## Math

3) From two tracking stations A and B, 350 km apart, a UFO is sighted at C above AB making angle CAB = 32 degrees and angle CBA = 54 degrees. Find the height of the UFO. The answer is 150 km, please explain to me how 4) from a boat on the water, the angle

*asked on November 24, 2012* -
## Math

Loon lake has a "killer plant" problem similar to Ghost Lake. Currently, 5000 square feet of the lake is covered with the plant, The area covered is growing by a factor of 1.5 each year. Complete the table to show area covered by the plant for the next 5

*asked on March 10, 2014* -
## calc

Gravel is being dumped from a conveyor belt at a rate of 30 cubic feet per minute. It forms a pile in the shape of a right circular cone whose base diameter and height are always the same. How fast is the height of the pile increasing when the pile is 18

*asked on November 26, 2011* -
## geometry

Find the value of x if m arc adc=5(x-3) and angle abc=165 degrees.

*asked on May 5, 2011* -
## Chemistry

Nitrogen Monoxide reacts with hydrogen gas to form nitrogen gas and water (vapor). (i). write a balanced equation for this reaction. (ii). The reaction is experimentally found to be (approx) first-order in H2 and second order in in NO. Write the form if

*asked on April 14, 2012* -
## Chemistry

The reaction (nitrogen monoxide reacts with hydrogen gas to form nitrogen gas and water vapor) is believed to take place in three steps, the first of which is the fast reversable dimerization of NO to form N2O2, and the last of which is the reaction N2O +

*asked on April 27, 2012* -
## Chemistry

Cl2+3F2 -> 2ClF3 how many grams of ClF3 form when .204 moles if F2 react with excess Cl2?

*asked on July 26, 2011* -
## Poem: Hanging fire by Audre Lorde

Could you check these answers thanks. 1. Did you feel more or less sympathy with the girl speaking in "Hanging Fire," than with the one speaking in "Young," explain your answer. Answer: I felt more sympathy with the girl in "Hanging Fire," because she's

*asked on January 24, 2009* -
## Typo (Test Marked)

Okay i had a typo i for got to add stars..i had emojis next to it that didn't show up What number is 73% of 215? (1 point) 215 = 0.73n n = 0.73 × 215 * 0.73 = n × 215 215 = 73n 2. What percent of 94 is 23? (1 point) n/94 = 23/100 23/94 = n/100 * 94/n =

*asked on January 6, 2016* -
## Math Help PLEASE !

Paul delivers newspapers. He charges $2.25 per week for daily plus Sunday delivery, and $1.00 per week for Sunday delivery only. Which expression below shoes how much Paul would collect in a week if he had 40 clients receiving daily plus Sunday delivery,

*asked on August 30, 2011* -
## Organic Chemistry Lab

How does the allylic halide behave under SN2 and SN1 conditions? Briefly explain why the allylic halide should be able to undergo both SN2 and SN1 mechanisms. If this is any relevant to the question, we did an experiment on the SN1/SN2 reactivity of alkyl

*asked on November 7, 2010* -
## Chem

The reaction (nitrogen monoxide reacts with hydrogen gas to form nitrogen gas and water vapor) is believed to take place in three steps, the first of which is the fast reversable dimerization of NO to form N2O2, and the last of which is the reaction N2O +

*asked on April 26, 2012* -
## social studies help plz!!!!!!!!!!!!!!

im doin a s.s project on christopher columbus's voyage and its kinda hard finding information!! can u give me any helpful websites?? This web site has a lot of good information about Columbus's voyages.

*asked on January 9, 2007* -
## Social Studies

I need help writing a poem about the encounter between the Europeans and the Taino. It needs to describes the initial meeting between Columbus’s crew and the Taino natives from both perspectives. I am awful at writing poems, anyone willing to help me

*asked on October 29, 2018* -
## college physics

A certain person's eye measures 24.0 mm from the pupil to retina. (a) If we treat the eye's lens as a thin lens, what is its focal length when the person focuses on a pencil 44.3 cm from the eye? (b) While the person focuses on the pencil, what is the

*asked on September 19, 2011* -
## math

how do i find the area of a primiter?

*asked on May 4, 2019* -
## Statistics

the international olympic committee states that the female participate in the 2004 Summer Olympic Games was 42%, even with the new sports for women such as weight lifting, hammer throw, and modern pentathalon being added to the Games. Broadcasting and

*asked on April 12, 2010* -
## physical

what is the size and direction of the final velocity of the two cars when a 0.4 kg toy train car moving forward at 3 m/s collides with and sticks to a 0.8 kg toy car that is traveling the opposite direction of -2 m/s

*asked on February 15, 2014* -
## Physics

A ball on the end of a string travels in a horizontal circle at a constant speed. The circle has a circumference of 3 m, the ball has a speed of 2 m/s, and the centripetal force is 4 N. How much work is done on the ball each time it goes around? A) zero B)

*asked on November 30, 2011* -
## Math

Interest is a concept familiar to most people: every credit card in existence has a term called annual percentage rate (APR), which is an interest rate. Suppose you charged $1,000 to a credit card that has a minimum payment each month equal to the interest

*asked on February 8, 2016* -
## Math

Trina works after school and on weekends. She always works three days each week. This week she worked 2 3/4 hrs on Monday. 3 3/5 hrs on Friday and 5 1/2 hrs on Saturday. Next week she plans to work the same number of hrs as this week but will work the same

*asked on October 27, 2015* -
## literature

when tecumseh says, "where today is the pequot? where the narragansetts, the mohawks?" he is

*asked on August 21, 2008* -
## math

a rental car company charges a fixed fee of 30$ plus $0.05 per mile. let c represent the total cost of renting a car and driving it m miles. Write a equation that could be used to find the total cost of renting a car and driving it any number of miles.

*asked on April 24, 2018* -
## math/ unit rates

A fertilizer covers 5/8 square foot in 1/4 hour.

*asked on September 28, 2014* -
## Poem Fable for when there's no way out

Could you help me with this poem I read it out loud I don't understand it one bit. Here's the questions. 1. How does the boy hear about the wonder horse? 2. Why does the boy admire the horse? 3. In what season does the boy capture the horse? 4. How does

*asked on January 25, 2009* -
## Calculus

A piece of wire 24 m long is cut into two pieces. One piece is bent into a square and the other is bent into a circle. (Give your answers correct to two decimal places.) (a) How much wire should be used for the circle in order to maximize the total area?

*asked on February 26, 2010* -
## algerbra

The function h = -t2 + 95 models the path of a ball thrown by a boy where h represents height, in feet, and t represents the time, in seconds, that the ball is in the air. Assuming the boy lives at sea level where h = 0 ft, which is a likely place the boy

*asked on April 11, 2016* -
## unit rates

Julio walks 3 1/2 miles in 1 1/4 hours

*asked on September 28, 2014* -
## physical

a 50 kg object moving at 12 m/s has a momentum of 600 kg times g m/s . what is the mass of an object moving at 4 m/s that has the same momentum?

*asked on February 15, 2014* -
## Math

Okay, so I know this should be really easy but my mind is just drawing a blank: For each series, calculate t12 and S12 a) 37 + 41 + 45 + 49 + ... Okay so I calculated S12 to be 708, and I know that's right. For t12, I know I can easily find the general

*asked on January 12, 2013* -
## English III

1. In Dust Tracks on a Road, what kind of literature did the young Hurston like best that made her think of heroic deeds? A. stories that were sad B. stories of math geniuses C. stories that were great myths D. stories about young women 2.What is the main

*asked on June 9, 2012* -
## English

Create an imaginary dialogue between Laotzu and a contemporary high school student in which the student asks for the philosopher's advice. Focus the dialogue on a concrete situation involving school, work, or relationships, and be sure that Laotzu's advice

*asked on March 11, 2011* -
## Geometry

To the nearest tenth, find the perimeter of ΔABC with vertices A(2,4), B(-2,1) and C(2,1). Show your work.

*asked on July 3, 2017* -
## Math

A clothing store ordered 300 sweaters and sold 20 of them at $100 the first week. The second week, the selling price was lowered by $10, and 40 sweaters were sold. In the third week. The selling price was lowered by another $10, and 60 sweated were sold.

*asked on January 12, 2013* -
## Brain freezer a.k.a. MATH

Please Help! Are all squares similar? I think that they aren't but i'm not sure. I think this because rectangles can be squares and rectangles can take different forms and shapes. Please help What do you mean by square? A square will always have a 4 sides

*asked on December 14, 2006* -
## Physics

A hockey puck is sliding on frictionless ice. It slams against the wall and bounces back toward the player with the same speed that it had before hitting the wall. Does the velocity of the hockey puck change in this process? Explain.

*asked on April 10, 2013* -
## math

Choose two of the following types of displays: dot plots, stem and leaf plots, histographs, pictographs, line plots, or circle graphs. In which situations is it appropriate to display data using each type you selected? When is it inappropriate to use the

*asked on December 15, 2009* -
## Math

At the beginning of soccer practice a water cooler contained 5 gallons of water. At the end of practice the water cooler is only 1/4 full. How many gallons of water are in the cooler at the end of practice? Explain

*asked on January 22, 2017* -
## Physics

A student travels 300m towards North and then 400m towards East to reach his school. Calculate the distance of his school from his home.

*asked on August 30, 2016* -
## Math

104 students responses 21 liked sledding as their favorite winter activity if 500 people had. Responded, how many would have been expected to list sledding as their favorite winter activity? Round to the nearest whole person

*asked on January 14, 2014* -
## chem

When varsol and iodine in potassium iodide aqueous solution is mixed, two phases form. What are the colours in each of the 2 phases when 2ml of I2/KI aqueous solution plus 2 ml of varsol are mixed in a test tube? What are the colours in each of the 2

*asked on March 1, 2011* -
## managerial accounting

Department A had 10,000 units in work in process that were 30% converted at the beginning of the period at a cost of $10,000. During the period, 15,000 units of direct materials were added at a cost of $60,000, 16,000 units were completed, and 9,000 units

*asked on February 27, 2011* -
## Chemistry

What is the enthalpy change (in kJ/mol) for the following process? Na+(g) + Br-(g) --> NaBr (s) Hint: use the Born-Haber cycle Note: the reference state for Br2 is Br2(l) not Br2(g) Data (in kJ/mol): enthalpy of sublimation of Na(s): 107 standard enthalpy

*asked on February 1, 2011* -
## pre-cal

find the constant c such that the denominator will divide evenly into the numerator x^4+10x^2+c/x+i

*asked on October 13, 2015* -
## Math

Hi(-: A newspaper editor wants to know whether people who buy the newspaper like the paper’s new format. He prints an alphabetical list of all the employee names and asks every fifth person on the list. Is the sample likely to be biased or unbiased?

*asked on May 5, 2015* -
## Statistic/Psychology

Joe had a score of 72 on the Counseling Aptitude Scale, and the standard error of measurement of the scale is 3. Where would we expect Tom's true score to fall 99.5 percent of the time? a.71 to 73 b. 69 to 75 c. 66 to 78 d. 63 to 81

*asked on July 27, 2013* -
## Chemistry

Magnesium metal reacts with phosphoric acid to produce hydrogen gas. If 50 g of phosphoric acid is used, how much magnesium metal is needed? How much hydrogen gas is produced?

*asked on February 5, 2014* -
## chemistry

what is the pH of a 0.10 M solution of methylamine (CH3NH2, kb= 4.4*10^-4) at 25 degree C?

*asked on November 28, 2012* -
## Physics

Physics Question Please Help? A wire, 20.0 m long, moves at 4.0 m/s perpendicularly through a magnetic field. An EMF of 40V is induced in the wire. What is strength of the magnetic field?

*asked on February 28, 2011* -
## chemistry

An element has ccp packing with a face-centered cubic unit cell. Its density is 1770 kg/m3 and the unit cell volume is 1.50 x 10-28 m3. Calculate the molar mass (g/mol) of the element to three significant figures.

*asked on January 20, 2012* -
## physics

a motorboat is driven across a river at 5km/h at right angles to a current flowing at 3.9km/h. What is the resulting speed of the motorboat?

*asked on January 12, 2012* -
## ACCOUNTING

Department A had 10,000 units in work in process that were 30% converted at the beginning of the period at a cost of $10,000. During the period, 15,000 units of direct materials were added at a cost of $60,000, 16,000 units were completed, and 9,000 units

*asked on March 3, 2011* -
## Math

Haden wants to cover a floor with square tiles the same size the floor measures 315 inches by 108 inches of she uses only whole tiles,find the greatest possible length of each tile;

*asked on November 13, 2018* -
## math/ unit rates

A garden snail moves 1/6 foot in 1/3 hour

*asked on September 28, 2014* -
## physics

a child bounces a superball on the sidewalk. The velocity change of the superball is from 23m/s downward to 14m/s upward. if the contact time with the sidewalk is 1/800s, what is the magnitude of the average force exerted on the superball by the sidewalk?

*asked on November 16, 2012* -
## math

in a recent poll of city voters it was found that 90% liked the view of the city skyline.find the probability that exactly 2 voters in a sample of 5 voters will like the viewof the city skyline.

*asked on March 12, 2012* -
## Pre-Cal (verifying trig identities)

How would you verify the identity? sin^1/2x-cosx-sin^5/2xcosx=cos^3xradsinx

*asked on February 12, 2009* -
## Poem: Young by Anne Sexton

Could you check these answer thanks so much 1. How do you think the girl in "Young," feels about where she is in her life. Answer: The girl wonders what is coming next in her life because she is full of questions about what's her future going to be like.

*asked on January 24, 2009* -
## Science

1. You observe two beakers containing clear liquid and ice cubes. In the first beaker, the ice cubes are floating. In the second, the ice cubes are on the bottom of the beaker. Write a hypothesis to explain the difference in your observations about the two

*asked on September 18, 2012* -
## statistics

The scores on a personality test are normally distributed with a mean of 250 and a standard deviation of 30. What proportion of people taking the test can be expected to score above 229?

*asked on February 25, 2011*