# Crystal

Popular questions and responses by Crystal-
## math

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

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

Out of a pool of 234 people with lottery tickets, 120 of them are women, and out of those 120, 65 are older than 23, and out of those 65, 12 are married. What is the probability that the lottery winner will be a married woman older than 25? A. 2/39 B.

*asked on July 19, 2018* -
## 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* -
## 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* -
## music

what is a percusion insrument Percussion instruments are played by being struck, shaken, rubbed or scraped. They are perhaps the oldest form of musical instruments. Some percussion instruments play not only rhythm, but also melody and harmony.

*asked on February 21, 2007* -
## miles

the Boggs family paid 49.75 for their car rental. how many miles did they drive? (p.s. it is based off the same question I sent before it)

*asked on April 24, 2018* -
## 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

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* -
## 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* -
## 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* -
## Chemistry

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

*asked on July 26, 2011* -
## math 1025

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

*asked on December 9, 2016* -
## Dressmaking and Design

I need to see if my answers are correct on a couple of questions. 1. It's especially important to avoid stitching across the seam allowances when sewing a a. patch pocket with straight edges b. corner that has a seam c. point that has no seam d.

*asked on April 17, 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

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: 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* -
## 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* -
## math/ unit rates

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

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

For each geometric series, calculate t6 and S6. a) 6 + 30 + 150 ... So I'm not exactly looking for an answer to this question but I was wondering why they want you to find t6 too? Would finding out t6 (via general formula) help in any way when finding S6?

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

Find an angle such that 3 times the complement of the angle is 10 degrees less than the supplement of the angle. I know that supplement means 180 and complement is 90. I don't know what kind of problem this is.

*asked on February 22, 2010* -
## 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* -
## Accounting

Does anyone have any idea what the Acronym ADE / CLR stands for? Thanks for your help.

*asked on July 14, 2008* -
## 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* -
## Statistics

What are the grand mean, the UCL and the LCL of a control chart for the mean? Why do you suppose + (with underline) standard errors are used in control charts and not two standard errors or even one standard error?

*asked on June 30, 2008* -
## pre-cal

Write a polynomial equation with integral coefficients that has 1/2 and 2i as solutions

*asked on October 6, 2015* -
## 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

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* -
## 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* -
## 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* -
## 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* -
## accounting

If the cost of, C(x), for manufacturing x units of a certain product is given by C(x)=x2-70x+4400, find the number of units manufactured at a cost of $7400?

*asked on August 21, 2012* -
## Chemistry

Draw a reaction profile (diagram of energy vs reaction coordinate) for a hypothetical reaction AB +C A+BC in which the foward reaction has an activation energy of 100kJ mol-1 and the backward reaction has an activation energy of 75kJ mol-1. (ii). a

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

Find the equation of a line that is perpendicular to 3x-2y=6 and passes through (1,2)

*asked on February 22, 2010* -
## 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* -
## Communication Theory

An objective theory is good in the eyes of an interpretive researcher if the explanation of communication behavior leads to further understanding of _________?

*asked on July 13, 2009* -
## 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* -
## science

A bus starts from rest and attains 40km/hr velocity after 10sec . Calculate the acceleration of bus in m/sec2

*asked on April 13, 2017* -
## Mathematics

Marsha has $60.00 . 2/3 of marsha's money is equal to 1/2 of Joanne's money .how much money does Joanne have ?

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

Determine whether the sequence is a Fibonacci-type sequence. If it is, determine the next two terms of the sequence. -4, 5, 1, -3, -2

*asked on November 24, 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* -
## HIS202

During the latter part of the 19th century, Republicans were particularly strong in the _____ states?

*asked on March 11, 2015* -
## US History

Which of the following 19th century developments most undermined the racial philosophy John C. Calhoun Outlined in the excerpt from his 1848 Senate speech? A The establishment of the Ku Klux Klan B The enforcement of the black codes C. The suspension of

*asked on January 27, 2015* -
## Chemistry

If it takes 54 mL of 0.1 M NaOH to neutralize 125 mL of an HCI solution, what is the concentration of the HCI?

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

A boy coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 6.2 m/s. If the coefficient of friction between the sled's runners and snow is 0.060 and the boy and sled together weigh 480 N, how far does the sled travel on the

*asked on March 4, 2013* -
## Chemistry

In the reaction 2H2O2(aq)-->2H2O2 + O2 (g), There is intially 0.865 M H2O2. After 10.0 minutes, the molarity of H2O2 changes to 0.792 M. What is the rate of reaction in terms of H2O2?

*asked on February 26, 2013* -
## 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* -
## 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* -
## Statistics

A jar contains 12 marbles, 5 of which are blue and 7 of which are red. If 4 marbles are chosen at random and without replacement, what is the probability of selecting 3 blue ones and 1 red one?

*asked on May 9, 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* -
## 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* -
## College Chemistry

Now the reaction (2NO+2H2==> 2H20+N2) is believed to take place in three steps, the first of which is the fast reversible dimerization of NO to form N2O2, and the last of which (again fast) is the reaction N20 + H2 --> N2 + H2O. So, what is the slow

*asked on April 17, 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* -
## chemistry

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

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

12. A baseball player throws a ball from left field toward home plate. Assume that you can neglect the effects of air resistance. At the instant the ball reaches its highest point, what is the direction of the ball's acceleration? A) up B) down C)

*asked on October 26, 2011* -
## CALCULUS

At noon, ship A is 40 nautical miles due west of ship B. Ship A is sailing west at 23 knots and ship B is sailing north at 19 knots. How fast (in knots) is the distance between the ships changing at 5 PM? (Note: 1 knot is a speed of 1 nautical mile per

*asked on October 24, 2011* -
## statistics

a companys ceo wanted to estimate the percentage of defective product per shipment. in a sample contianing 600 products he found 45 defective product. a. find 99% confidence interval for the true porporton of defective product show calcultions and explain

*asked on August 23, 2011* -
## geometry

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

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

9-Volt battery is used to charge a 375 mF capacitor over a 147 Ù resistance. How many seconds will it take for the capacitor to reach 75% of its maximum charge? Hint: The equation below represents the charge of a charging capacitor as a function of time Q

*asked on March 10, 2011* -
## physics

Two capacitors, identical except for the dielectric material between their plates, are connected in parallel. One has a material with a material with a dielectric constant of 2, while the other has a material with a dielectric constant of 3. What is the

*asked on March 10, 2011* -
## physics

A rectangular piece of gold is 2.6 cm long and 3.9 cm wide.The piece displays a resistance of 1.47 ìÙ when a current flows along the depth-direction. In cm, how deep is the piece?

*asked on March 2, 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* -
## victoria Ci

We find an electric field of magnitude E = 1.2 x 107 V/m across a particular nerve membrane. The potential difference between the interior and exterior surface of the membrane is 65 mV. The thickness of the membrane is closest to

*asked on February 24, 2011* -
## physical science

how much work is done on a 100kg crate that is hoisted 4 m in a time of 4 seconds

*asked on November 21, 2010* -
## health

If you’re aerobically fit, you can A. quit your normal exercise routine without any negative effects. B. sustain a regular routine of exercise for 30–60 minutes with minimal fatigue. C. lift very heavy weights without injuries to your joints. D. run a

*asked on September 23, 2010* -
## government

Congress's inability to consistently provide leadership on broad national issues is due to

*asked on July 25, 2010* -
## 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* -
## chemistry

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

*asked on March 5, 2009* -
## Writing Sentences and parahgraphs

You’ve applied for a specific job in your field of study. The Human Resources Department arranges an interview and tells you to bring with you a polished piece of writing for them to evaluate your writing skills. The paragraph must describe one

*asked on February 18, 2009* -
## literature

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

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

What is PbCO3(s)-->PbO(s)+CO2(g) A. neutralization B. metathesis C. combustion D. decomposition E. combination Looks like the lead carbonate is decomposing to lead oxide and carbon dioxide to me. check my thinking.

*asked on September 15, 2006* -
## Math

The stem and leaf plot shows the number of cans of good collected by various students for a good drive what was the greatest number of cans collected

*asked on October 18, 2019* -
## math

Justin recently drove to visit his parents who live 96 miles away. On his way there his average speed was 20 miles per hour faster than on his way home (he ran into some bad weather). If Justin spent a total of 4 hours driving, find the two rates.

*asked on July 26, 2019* -
## Math

A librarian is expanding some sections of the city library. He buys books at a special price from a dealer who charges one price for any hardback book and another price for any paperback book. For the children's section, Mr. Shah purchased 31 new hardcover

*asked on March 12, 2018* -
## 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* -
## Science

Identify the following types of tissue as connective, muscle, nerve, or ephithelial: A. Tendon - Muscle B. Sciatic Nerve- Nerve C. Fat - ? D. Blood Vessel - Nerve E. Skin - Ephithelial F. Ligament - ? G. Bone - ? H. Muscle - Muscle ( I got them all except

*asked on April 1, 2017* -
## Math- PLEASE HELP!! I DONT GET THIS QUESTION!!

Molly bought two sweaters for $30 each and three pair of pants for $25 each. She had a 20% off coupon for her entire purchase. Model and write an expression for the amount of money Molly spent. State your answer in a complete sentence.

*asked on March 27, 2017* -
## 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* -
## 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* -
## 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* -
## Riddle

I have two bodies, joined as one; Watch this trick: Ill flip, stand still, and run. What am I?

*asked on August 26, 2016* -
## 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

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* -
## 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* -
## math

Michael ate 1/4 of a pizza and his brother ate 3/8 of the same pizza . How much of the pizza was left?

*asked on March 23, 2015* -
## chemistry

Predict if a precipitate will form when 20.00 mL of the 50% saturated solution is mixed with 20.00 mL of 0.0100M of the following solutions.? the saturated solution is : BaCO3, it has the Ksp of 5.1 x 10^-9 the solubility is 7.1 x 10^-5 M. I don't know how

*asked on February 17, 2015* -
## math/ unit rates

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

*asked on September 28, 2014* -
## math/ unit rates

Kenny reads 5/8 page in 2/3 minute

*asked on September 28, 2014* -
## History 12

What does lenin have to do with Tsarism, World War 1, March revolution and the provisional government, November Revolution, the civil war, War Communism, national Economic Policy, Trotsky, Stalin, and the Comintern?

*asked on March 14, 2014* -
## 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* -
## 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* -
## 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* -
## Statistcal Analysis

I need some help with figuring out the ratio-to-moving average. Can someone help me? Here's the problem: Sales of roof material, by quarter, since 1994 for Carolina Home Construction, Inc. are shown below (in $000): Quarter Year I II III IV 1994 210 180 60

*asked on January 25, 2014*