# chris

Popular questions and responses by chris-
## math

A man owned 75 shares of stock worth $50 each. The corporation declared a dividend of 8%, payable stock. how many shares did he then own?

*asked on November 2, 2016* -
## Math

Six gross of special drawing pencils were purchased for use in a department. If the pencils were used at the rate of 24 a week, the maximum number of weeks that the 6 gross of pencils would last is?

*asked on November 5, 2016* -
## math

A dealer bought some bicycles for $4,000. He sold them $6,200, making $50 on each bicycle. How many bicycles were here?

*asked on November 5, 2016* -
## math

Sam had a total of 80 foreign stamps and local stamps combined. After giving away 1/3 of his foreign stamps and 10 local stamps, he had an equal number of foreign stamps and local stamps left. How many local stamps did he have in the beginning?

*asked on July 30, 2014* -
## Math

Find the savings plan balance after 2 years with an APR of 9% and monthly payments of $250 Can someone help me? Idk if im right but do I multiply $250 by 9% an then divide?

*asked on August 11, 2017* -
## not sure

many american cars feture speedometers that show kilometers per hour. If you are required to drive 55 miles and you know that one kilometer is approximately 5/8 of a mile, how many kilometers would you cover in that journey? 800 but how and why? nevermind.

*asked on July 25, 2007* -
## world history

Which option accurately describes key events of Peter the Great’s reign? His reign involved the Northern War, gaining access to the Baltic, and founding a new capital in St. Petersburg. His reign involved a disastrous invasion of England in 1812, and he

*asked on January 22, 2019* -
## Arithmetic

a boy sold $88.50 worth of stationery. If he received a 33 1/3% commission, what was the amount of his commission?

*asked on November 7, 2016* -
## Arithmetic

A man paid $42.30 for gasoline in may, $38.60 in June, and $43 in July. What was the average monthly cost for gasoline?

*asked on November 5, 2016* -
## Physics

A 39-turn circular coil of radius 3.20 cm and resistance 1.00 Ω is placed in a magnetic field directed perpendicular to the plane of the coil. The magnitude of the magnetic field varies in time according to the expression B = 0.010 0t + 0.040 0t2, where B

*asked on March 3, 2015* -
## Math

You are given 9 to 1 odds against tossing three heads with three coins, meaning you win $9 if you succeed and you lose $1 if you fail. (Find the expected value of the described game. Would you expect to win or lose money in 1 game? in 100 games? Explain.

*asked on April 14, 2011* -
## Science

How many Btu's are required to change five pounds of ice at 20°F to water at 160°F? a. 2,608 Btu’s b. 1,390 Btu’s c. 1,304 Btu’s d. 141 Btu’s I am trying ((160-20)x.5)x5 but not getting any of the possible choices. What am I missing? Thanks for

*asked on March 13, 2016* -
## Chemistry

MF17083:For the following reaction find Kp at 25°C and indicate whether Kp should increase or decrease as the temperature rises. NH4HS(s) H2S(g) + NH3(g); DH° = 83.47 kJ and DG° = 17.5 kJ at 25°C. - A. B. C. D. E. F. Kp = - A. B. C. D. E. F. Kp

*asked on April 27, 2007* -
## economics

Two goods are complements when a decrease in the price of one good a. decreases the quantity demanded of the other good. b. increases the quantity demanded of the other good. c. increases the demand for the other good. d. decreases the demand for the other

*asked on September 24, 2010* -
## Chemisry

what mass of protons would be required to just neutralize the charge of 1.0g of electrons? how do I answer this? You know the mass of an electron. Calculate how many are in 1 gram. You will need the same number of protons. Knowing the mass of a proton

*asked on February 8, 2007* -
## chemistry

Asprin, C9H8O4, is prepared by reacting salicylic acid, C7H6O3, with acetic anhydride, C4H6O3, in the reaction C7H6O3(s) + C4H6O3(l) -> C9H8O4(s) + C2H4O2(l) A student is told to prepare 45.0 g of aspirin. She is also told to use a 55.0% excess of the

*asked on October 18, 2006* -
## math

Add the following vectors using the Component law. a. 9 m/s [N30°E] and 2 m/s [N 60°E]. b. 3 N in a direction 15° south of west and 4 N in a direction 12° east of south.

*asked on November 12, 2018* -
## math

Two hikers started at the same location. One traveled 2 miles east and then 1 mile north. The other traveled 1 mile west and then 3 miles south. At the end of their hikes, how many miles apart are the two hikers?

*asked on April 10, 2009* -
## stats

Find the z-scores for which 92 % of the distribution's area lies between minus z and z.

*asked on September 18, 2016* -
## Chemistry

Calculate the enthalpy change for the reactions NO(g) + O(g) → NO2(g) from the following data: NO(g) + O3(g) → NO2(g) + O2(g) ΔH = -198.9 kJ O3(g) → 1.5O2(g) ΔH = -142.3 kJ O2(g) → 2O(g) ΔH = 495.0 kJ Put the answer in kJ.

*asked on May 5, 2014* -
## Educational Technology

1. Which of the following choices is a strategy that could help with time management? A. Spending most of the day on leisure activities. B. Doing homework in every spare moment. C. Cutting back on sleep. D. Creating a list of tasks to be completed daily.*

*asked on April 16, 2014* -
## physics

charge A has a charge of 2C, Charge B has a charge of -3C and is located 1 meter to the right of A. Charge C is located 1 meter to the right of charge B and has a charge of -1C. if a fourth charge (charge D) is placed 4 meters to the right of charge B, how

*asked on February 11, 2013* -
## Chemistry

Vinegar is a solution of acetic acid, CH3COOH, dissolved in water. A 4.69 g sample of vinegar was neutralized by 32.97 mL of 0.100 M NaOH. What is the percent by weight of acetic acid in the vinegar?

*asked on April 14, 2014* -
## trig

find exact value using sum or differnce equations. tan(19pi/12)

*asked on November 18, 2010* -
## Math

Someone answer all of this clearly, I don't get it at all. Suppose a ship is sailing at a rate of 35km/h parellel to a straight shoreline. The ship is 10km from shore when it passes a lighthouse at 11am. Question 6 options: a) Let k be the distance between

*asked on January 27, 2016* -
## chem

At a certain temperature, the reaction CO(g) + 2H2(g) CH3OH(g) has Kc = 0.500. If a reaction mixture at equilibrium contains 0.00436 M CH3OH and 0.220 M H2, what is the equilibrium concentration of CO? The answer is 0.280 M. I don't know how to get it.

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

Sulfur trioxide, SO3, is made from the oxidation of SO2, and the reaction is represented by the equation 2SO2 + O2 2SO3 A 25-g sample of SO2 gives 18 g of SO3. The PERCENT YIELD of SO3 is?

*asked on May 12, 2010* -
## Chemistry

Given 2Al2O3 (s) --> 4Al(s) + 3O2 (g) (standard enthalpy change= 3351.4 kJ) a) What is the heat of formation of aluminum oxide? How do I find heat of formation from standard enthalpy change? I know how to do it when I'm given enthalpy, but they aren't the

*asked on January 31, 2007* -
## Physics

a ball is released from the top of a 67.0 m high building. At the same instant a second ball is shot straight up from the ground with an initial speed of 20.0 m/s, directly below the point where the first ball was dropped. Ignore air drag and calculate a.

*asked on August 13, 2018* -
## Chemistry

Given the thermochemical equation 2SO2 + O2 → 2SO3, ΔH°rxn = -198 kJ/mol, what is the standard enthalpy change for the decomposition of one mole of SO3?

*asked on May 5, 2014* -
## Chem Check Please!!!

1) Assuming the following reaction proceeds in the forward direction, 3 Sn4+(aq) + 2 Cr(s) ---> 3 Sn2+(aq) + 2 Cr3+(aq) a.Sn4+(aq) is the reducing agent and Cr(s) is the oxidizing agent. b.Cr(s) is the reducing agent and Sn2+(aq) is the oxidizing agent.

*asked on May 2, 2014* -
## calculus help

Farmer Brown wants to fence in a rectangular plot in a large field, using a straight rock wall that is already there as the north boundary. The fencing for the east and west sides of the plot will cost $3 a yard, but she needs to use special fencing, which

*asked on April 25, 2014* -
## economics

Market research has revealed the following information about the market for chocolate bars. The demand schedule can be represented by the equation QD=1,600-300P, where QD is the quantity demanded and P is the price. The supply schedule can be represented

*asked on July 9, 2010* -
## Health

Appropriate cooking methods are cost efficient because?

*asked on December 12, 2012* -
## College Algebra Application

Newton's Law of Cooling T(t)=T0+(T1-T0)e^-kt The police discover the body of a murder victim. Critical to solving the crime is determining when the murder was committed. The coroner arrives at the murder scene at 12:00pm. She immediately takes the

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

A gear with a radius of 32 centimeters is turning at pi/9 radians/sec. What is the linear speed (velocity) at a point on the outer edge of the gear?

*asked on March 15, 2015* -
## Physics

A step-up transformer used on a 120 V line has 95 turns on the primary and 2850 turns on the secondary. What is the emf across the secondary? A. 30 V B. 1800 V C. 2400 V D. 3600 V

*asked on April 15, 2019* -
## Spanish

Instructions: Modifique el párrafo por cambiar las palabras entre comillas al tiempo FUTURO. Modelo: Mi familia ‘va a visitar’ a nuestros abuelos este verano. Mi familia visitará a nuestros abuelos este verano. Este año ‘vamos a hacer’ una

*asked on October 26, 2016* -
## physics

An 840 Kg roller coaster car is launched from a giant spring of constant k=31 kN/m into a frictionless loop-the-loop track of radius 6.2 m, as shown below. What is the minimum amount that the spring must be compressed if the car is to stay on the track?

*asked on February 29, 2012* -
## thermodynamic

Energy is added to a piston-cylinder arrangement. The piston is withdrawn in such a way that the temperature remains constant. The initial pressure and volume are 200 KPa and 2m^3, respectively. If the final pressure is 100 KPa, determine the work done by

*asked on January 9, 2011* -
## English

1. None of the guests (has, have) left. 2. Each of these apples (is, are) ripe. 3.One of my favorite songwriters (is, are) Billy Joel. 4.Some of my cousins (has, have) come to my party. 5.All of the bread (was, were) eaten. Tell if the indefinite pronoun

*asked on December 8, 2010* -
## Physical Education

Two bodies are thrown vertically upwards with the same initially velocity of 98metre/sec but 4 sec apart.How long after is thrown will they meet?

*asked on August 25, 2010* -
## Life orientation

Impact of risk behaviour. Social and emotional

*asked on July 21, 2017* -
## Chemistry

A solution is made by adding 0.100 mole of ethyl ether to 0.500 mole of ethyl alcohol. If the vapor pressures of ethyl ether and ethyl alcohol at 20 oC are 375 torr and 20.0 torr, respectively, the vapor pressure of the solution at 20 oC (assuming ideal

*asked on November 14, 2013* -
## algebra

Can anyone solve A= 1/2h(a+b) solve for h

*asked on October 23, 2011* -
## Chemistry

How many grams of lithium nitrate, LiNO3, are required to prepare 3.00 × 102 mL of 2.00 × 10–1 M solution?

*asked on May 12, 2010* -
## chemistry

In a certain chemical reaction 1.00 gram of product is produced in 15 minutes when the reaction is carried out at 20oC. Assuming that there is sufficient starting material available, how much product will be produced in the same length of time if the

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

an object moving on the x axis with a constant acceleration increases its x coordinate by 108 m in a time of 9.5 s and has a velocity of 20 m/s at the end of this time. Determine the acceleration of the object during this motion?

*asked on August 10, 2014* -
## Analytical

Calculate the pH of 7.2 × 10-8 M HCl. Report your answer to the hundredths place. Next, What fraction of the total H in this solution is from the HCl? Report your answer to the hundredths place.

*asked on September 27, 2012* -
## Chem

What is the mole fraction of H2 in a mixture with the total pressure of 800 torr when the partial pressure of H2 is 90 torr?

*asked on June 29, 2011* -
## geometry

if triangle FGH~ to Triangle PQR, FG = 6, PQ = 10 and the perimeter of trinagle PQR is 35 find the perimeter of triangle FGH

*asked on December 13, 2010* -
## Physics

Two point charges, 5.0 µC and -2.0 µC, are placed 5.0 cm apart on the x axis, such that the -2.0 µC charge is at x = 0 and the 5.0 µC charge is at x = 5.0 cm. At what point(s) along the x axis is the electric field zero? I'm not exactly sure how i

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

Help me for this question on composite functions Does the composition of functions display the commutative property? Give an example of each case to illustrate your answer.

*asked on January 24, 2016* -
## chemistry

net ionic equations for Ca(NO3)2 +NaPO4

*asked on April 15, 2013* -
## Chem

Is this reaction endothermic or exothermic? Ca(C2H3O2)2(s) = Ca2+(aq) + 2C2H3O2-(aq)

*asked on November 13, 2012* -
## Physics 2

A cyllindrical copper cable carries a current of 1200 A. There is a potential difference of 1.6×10−2 V between two points on the cable that are 0.24 m apart. What is the radius of the cable?

*asked on February 11, 2010* -
## chemistry help

What is the molarity of a solution that contains 125 g NaCl in 4.00 L solution? a.8. 56 M b.31.3 M c. 2.14 M d/ 0.535 M

*asked on May 21, 2009* -
## Chemistry

Consider the following equilibrium process at 700°C: 2H2 + S2 ↔ 2H2S Analysis shows that there are 2.50 moles of H2, 1.35x10^-5 mole of S2, and 8.70 moles of H2S present in a 12.0-L flask. Calculate the equilibrium constant Kc for the reaction.

*asked on March 9, 2009* -
## AP chem

I have a problem set due tomorrow, and two problems in it were not covered in class. The first is this: Molybdenum has an atomic radius of 0.145 nm. The volume of its cubic unit cell is 0.0375 nm^3. What is the geometry of the molybdenum unit cell? I have

*asked on December 7, 2006* -
## Arithmetic

If pencils are bought at 70 cents per dozen and sold at 3 for 20 cents, the total profit on 6 dozen is?

*asked on November 16, 2016* -
## ART PLEASE HELP!!!!

Superhero by.Kiana S. This student most likely creates art based on all of the following except A.personal interests B.personal style C.skill set D.knowledge of art history

*asked on January 14, 2015* -
## Chemistry

I am having trouble getting the Net ionic equation for: 1)MgSO4 + Na3PO4= 2)Na2CO3 + ZnCl2= 3)Na2CO3 + Na3PO4= 4) Na3PO4 +ZnCl2=

*asked on July 4, 2013* -
## Geometry

A museum was designed without windows, but a truncated cylindrical skylight lightens the building. In the development of this, the architect has areas where the angles formed at junctures are vertical angles. If a pair of vertical angles measures 5x - 54

*asked on October 31, 2012* -
## Math

A warranty identification number for a certain product consists of a letter of the alphabet followed by a seven-digit number. How many possible identification numbers are there if the first digit of the seven-digit number must be nonzero?

*asked on April 3, 2012* -
## Calculus

"Two cars are traveling along perpendicular roads, car A at 40mph, car B at 60mph. At noon, when car A reaches the intersection, car B is 90miles away, and moving toward it. At 1PM the distance between the cars is changing at what rate?" So lost! Please

*asked on January 24, 2012* -
## computer mother boards

What is the best mother board for less than 150 us dollars? preferably one with nvidia-sli.

*asked on September 1, 2008* -
## Spanish

SraJMcGin can you please help me? Modifique el texto por cambiar los verbos italizados de lo familiar (informal) a lo formal Prepara (1) prepare para salir de viaje el lunes por la mañana. Para ello, haz (2) haga las maletas, sal (3) salga de la

*asked on October 11, 2016* -
## Pre-Calculus

The minute hand of a clock is 3 inches long. How far does the tip of the minute hand move in 5 minutes? If necessary, round the answer to two decimal places.

*asked on September 10, 2016* -
## math

a plat form and a building are on the same horizontal plane , the angle of depression of the bottom of the building from the top A of the platform is 39 degree. the angle of elevation of the top D of the building from the top of the platform is 56 degree.

*asked on May 12, 2016* -
## Physics

A weight suspended from a spring is seen to bob up and down over a distance of 11 cm twice each second. What is its frequency? Answer in units of Hz. 002 (part 2 of 3) 10.0 points What is its period? Answer in units of s. 003 (part 3 of 3) 10.0 points What

*asked on February 6, 2015* -
## Healthcare Finance

A firm that owns the stock of another corporation does not have to pay taxes on the entire amount of dividends received. In general, only 30 percent of the dividends received by one corporation from another are taxable. The reason for this tax law feature

*asked on May 25, 2013* -
## geometry

In ∆RST, RS = 10, RT = 15, and m∠R = 32. In ∆UVW, UV = 12, UW = 18, and m∠U = 32. Which of the following statements is correct? 1. ∆RST ∼ ∆WUV and the similarity ratio is 56. 2. ∆RST ∼ ∆UVW and the similarity ratio is 56. 3. ∆RST ∼

*asked on November 3, 2011* -
## statistics

Classify the variable as nominal, ordinal, discrete, or continuous, and explain: Customer’s driver’s license number

*asked on June 28, 2011* -
## ap chemistry

please explain titration problems. I'm a total noob at this and am trying to answer some prelab questions. Examples: 1. How many mL of a 0.800 M NaOH solution is needed to just neutralize 40 mL of a 0.600 M HCl solution? 2. You wish to determine the

*asked on October 2, 2008* -
## Chemistry

Which of the following pairs of atoms would you expect to combine chemically to form an ionic compound? A.Li and S B.O and S C.Al and O d.F and Cl e.I and K F.H and N Which of the following pairs of elements will not form ionic compound. a.sulfur and

*asked on November 16, 2006* -
## Chemistry

Ca+N-->Ca3N2 -What is limiting reagent? -Mass of calcium nitride formed when 50.0g of calcium reacts with 50.0g of Nitrogen? -Excess? CAN SOMEONE DOUBLE CHECK MY ANSWERS: Calcium is limiting reagent. Mass of Ca3N2: 68.4g Ca3N2 Excess: 38.4N left over.

*asked on November 16, 2017* -
## Bio

if you knew makeup of a specific proteins in a cell , how would you determine the particular dna code that coded for them

*asked on December 20, 2016* -
## Finite Math

A student dance committee is to be formed consisting of 3 boys and 4 girls. If the membership is to be chosen from 7 boys and 6 girls, how many different committees are possible?

*asked on December 3, 2012* -
## Honors Chemistry

1. What is the pH of a solution whose [H3O+] is 1 X 10^ -5 M? 2. What is the [H3O+] concentration of a solution with a pH of 9? 3. What is the pH of a solution whose [H3O+] concentration is 3 X 10^-3 M? 4. What is the pH of a solution with a [H3O+]

*asked on April 6, 2012* -
## Physics

A block is pushed across a horizontal surface with a coefficient of kinetic friction of 0.15 by applying a 150 N horizontal force. If the block accelerates at the rate of 2.53 m/s2 (squared), what is the mass of the block?

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

Which of the following BEST describes the theory of natural selection?

*asked on September 11, 2011* -
## College Physics

100 grams of molten lead (600oC) is used to make musket balls. If the lead shot is allowed to cool to room temperature (21oC), what is the change in entropy (in J/K) of the lead? (For the specific heat of molten and solid lead use 1.29 J/g oC; the latent

*asked on June 12, 2011* -
## Chemistry

Which of the following aqueous solutions are good buffer systems ? . 0.26 M hydrochloric acid + 0.24 M potassium chloride . 0.14 M acetic acid + 0.20 M potassium acetate . 0.16 M potassium hypochlorite + 0.23 M hypochlorous acid . 0.31 M hydrocyanic acid +

*asked on February 26, 2011* -
## Chemistry

C3H8 + 5O2 3CO2 + 4H2O How many grams of oxygen are required to burn 7.0 g of C3H8?

*asked on May 12, 2010* -
## math problems

i really don't get this one. A stock clerk had 600 pads on hand. He then issued 3/8 of his supply of pads to division x, 1/4 to division y and 1/6 to division z. The number of pads remaning in stock is? 125 why and how? 3/8 x 600 = ? 1/4 x 600 = ? 1/6 x

*asked on July 25, 2007* -
## Geometry

A 6-ft vertical post casts a 20-in shadow at the same time a nearby cell phone tower casts a 115-ft shadow. How tall is the cell phone tower?

*asked on December 5, 2019* -
## Life orientation

Identify and explain five recommendation to address teenage pregnancy.

*asked on August 8, 2019* -
## Algebra

Verify the identity. Justify each step. tan (thetA) + cot (thetA) = 1 / sin (thetA) cos (thetA)

*asked on May 7, 2019* -
## Chemistry

The heat of solution of ammonium chloride is 15.2 kJ/mol. If a 6.187 g sample of NH4Cl is added to 65.0 mL of water in a calorimeter at 26.5°C, what is the minimum temperature reached by the solution? [specific heat of water = 4.18 J/g°C; heat capacity

*asked on May 5, 2014* -
## physics

A 0.13 kg ball of dough is thrown straight up into the air with an initial speed of 18 m/s. The acceleration of gravity is 9.81 m/s2 .What is its momentum halfway to its max- imum height on the way up?

*asked on February 24, 2014* -
## math

A girl 1.6 m tall, stands 3.6 m from a lamp post at night. Her shadow from the light is 0.9m long. How high is the lamp post?

*asked on March 20, 2013* -
## Algebra

The length of a rectangular playground exceeds twice its width by 25 meters, The perimeter of the playground is 650 meters. Find the demensions of the playground.

*asked on October 30, 2012* -
## principles of physics

A carnival has a Ferris wheel where the seats are located halfway between the center and outside rim. If you were at the outside rim, your angular speed while riding on this Ferris wheel would be A) more and your tangential speed less.B) less and your

*asked on March 2, 2012* -
## math

mikes average on the first four exams in econ 1A is 88. what must he earn on the next exam to raise his overall average to 90

*asked on April 27, 2010* -
## Trigonometry

1. Find the exact value of the following (Think identity) Cos(2 Arccos(5/13)) 2. Solve the following equation for 0° ≤ Θ < 360° Sec(Θ)= tan(Θ) + cos(Θ)

*asked on April 26, 2010* -
## algebra

the area of the parallelogram is 96 square miles. Find its base and height. if the base is x+5 and the height is x-5

*asked on April 23, 2010* -
## math

what is the factorial of a negative number? The factorial function has singularities at the negative integers. You can see this as follows. For integers we define: (n+1)! = (n+1)n! and we put 0! = 1 So, from 0! you can compute 1! and from that you can

*asked on July 10, 2007* -
## Chem

Butane, C4H10, is widely used as a fuel for disposable lighters. When one mole of butane is burned in oxygen, carbon dioxide and steam are formed and 2658 kJ of heat is evolved. a) Write the thermochemical equation for the reaction. First I wrote the

*asked on February 1, 2007* -
## chemistry

Fructose is a sugar commonly found in fruit. A sample of fructose, C6H12O6, weighing 4.50 g is burned in a bomb calorimeter. The heat capacity of the colorimeter is 2.115 E4 J/ºC. The temperature in the calorimeter rises from 23.49ºC to 27.71ºC. A)What

*asked on January 28, 2007* -
## Chemistry

Magnesium sulfate is often used it first aid hot-packs giving off heat when dissolved in water. When 2.00 g of MgSO4 dissolves in 15.0 mL of water (d= 1.00g/mL) at 25.0ºC, 1.51 kJ of heat is evolved. A) Write the balanced equation for this reaction. I

*asked on January 28, 2007*