# Posts by John

Total # Posts: 8,289

**Chemistry**

Tarnish on iron is the compound FeO. A tarnished iron plate is placed in an aluminum pan of boiling water. When enough salt is added so that the solution conducts electricity, the tarnish disappears. Imagine that the two halves of this redox reaction were separated and ...

*May 14, 2014*

**ALGEBRA**

there is an error in the equatiion i believe?

*May 14, 2014*

**Chemistry**

Ni2+(aq)+Mg(s)→Ni(s)+Mg2+(aq) Indicate the half-reaction occurring at Anode. Indicate the half-reaction occurring at Cathode.

*May 14, 2014*

**History**

Are you talking bout Canadian History?

*May 13, 2014*

**Geometry**

Let O and H be the circumcenter and orthocenter of triangle ABC, respectively. Let a, b, and c denote the side lengths, and let R denote the circumradius. Find OH^2 if R = 7 and a^2 + b^2 + c^2 = 29. I tried to draw a diagram but it didn't work out too well. Could I have ...

*May 13, 2014*

**Math Solve for X?**

You should multiply both sides by x^2+5x-24 so we get 5x^2-12x <= 0 now we get 5x^2 <= 12x Divide both sides by x and we get 5x <=12 so x <= 12/5

*May 13, 2014*

**math**

Plug in some numbers.

*May 13, 2014*

**geometry**

correct so it is equal to 500 * (1+0.04)^5 Now solve

*May 13, 2014*

**Programming Concepts**

Try stackoverflow. com

*May 13, 2014*

**Physics**

A 0.28 kg softball has a velocity of 16 m/s at an angle of 34° below the horizontal just before making contact with the bat. What is the magnitude of the change in momentum of the ball while it is in contact with the bat if the ball leaves the bat with a velocity of (a) 21...

*May 13, 2014*

**math**

A room is18 ft long 14 ft wide and 8 ft high. Find the cost of carpeting the floor with carpet $5\ft2

*May 8, 2014*

**statistics**

a) 12 b) 12 c) 0

*May 8, 2014*

**Chemistry**

Butane, C4H10, is a component of natural gas that is used as fuel for cigarette lighters. The balanced equation of the complete combustion of butane is 2C4H10(g)+13O2(g)→8CO2(g)+10H2O(l) At 1.00 atm and 23 ∘C, what is the volume of carbon dioxide formed by the ...

*May 6, 2014*

**algebra**

Please Explain how to factor the following trinomials forms: x2 + bx + c and ax2 + bx + c in words.

*May 6, 2014*

**algebra**

Factor the expression. x2 + 2x + 24 HintX

*May 5, 2014*

**reading- suffix**

First off the 2 people who answered are complete morons, and i'm having the same issue. but i'd probably have to say it's either B or C

*May 5, 2014*

**physics**

A metal ball of mass 1.8 kg with initial temperature of 46.5 C is dropped into a container of 3 kg of water at 15 C. If the final temperature is 22.6 C, what is the specific heat of the metal? metal = ____ J/kg*C?

*May 4, 2014*

**Chemistry**

Aniline, C6H5NH2, is a weak base. If the hydroxide ion concentration of a 0.223 M solution is 9.7 10-6 M, what is the ionization constant for the base?

*May 1, 2014*

**Geometry**

so what are the answers???

*May 1, 2014*

**Statistics**

From the following list of number of discharges each day in September, compute the mean, median, mode, and range. Round the mean and median to one decimal point. Day # of discharges 1 27 2 22 3 35 4 63 5 42 6 55 7 62 8 65 9 32 10 35 11 36 12 75 13 65 14 84 15 37 16 38 17 62 18...

*April 24, 2014*

**physics**

A 225-kg box is pushed horizontally with a force of 620N. If the coefficient of friction is 0.20, calculate the acceleration of the box.

*April 23, 2014*

**statistics**

A sociologist is interested in the relation between x = numberof job changes and y = annual salary (in thousands of dollars) forpeople living in the Nashville area. A random sample of 10people employed in Nashville provided the followinginformation: x (number of job changes) 4...

*April 20, 2014*

**chem**

Given that the density of the supplied vinegar solution in this experiment is 1.025 g/mL, calculate the % acetic acid found in the vinegar sample.

*April 15, 2014*

**physics**

but what is the tension of the wire

*April 14, 2014*

**Calculus**

ABC Daycare wants to build a fence to enclose a rectangular playground. The area of the playground is 900 square feet. The fence along three of the sides costs $5 per foot and the fence along the fourth side, which will be made of brick, costs $10 per foot. Find the length of ...

*April 13, 2014*

**math trigonometry**

two office towers are 31 m apart. From the top of the shorter tower, the angle of elevation to the top of the tall tower is 25 degrees . The angle of depression to the base of the taller tower is 31 degrees. Calculate the height of each tower

*April 13, 2014*

**math**

two office towers are 31 m apart. From the top of the shorter tower, the angle of elevation to the top of the tall tower is 25 degrees . The angle of depression to the base of the taller tower is 31 degrees. Calculate the height of each tower

*April 13, 2014*

**Chemistry**

Calculate the standard cell potential for each of the electrochemical cells? What would the answers be to something like this? If someone could work out the answer I would really appreciate it. My online hw keeps telling me its wrong. 2Ag+(aq)+Pb(s)→2Ag(s)+Pb2+(aq) E&#...

*April 12, 2014*

**Chemistry**

Calculate the standard cell potential for each of the electrochemical cells? What would the answers be to something like this? If someone could work out the answer I would really appreciate it. My online hw keeps telling me its wrong. 2Ag+(aq)+Pb(s)→2Ag(s)+Pb2+(aq) E&#...

*April 12, 2014*

**Chemistry**

Calculate ΔG∘rxn and E∘cell for a redox reaction with n = 1 that has an equilibrium constant of K = 28? What would the answer be to this? Could someone work this out for me please? ΔG∘rxn = ......kj E∘cell = ......V

*April 12, 2014*

**physics**

A cylindrical conductor of radius carries a uniformly distributed current I. Show that the magnetic field within the conductor measured at a distance r from the center is given by the following equation... B= (u0Ir)/2pi a^2

*April 12, 2014*

**Chemistry**

Calculate ΔG∘rxn and E∘cell for a redox reaction with n = 1 that has an equilibrium constant of K = 28? What would be the answer to this fine question. How would you do something like this? Thanks :) ΔG∘rxn = ......kj E∘cell = ......V

*April 11, 2014*

**chemistry**

Calculate the standard cell potential for each of the electrochemical cells? 2Ag+(aq)+Pb(s)→2Ag(s)+Pb2+(aq) E∘cell......V? 2ClO2(g)+2I−(aq)→2ClO−2(aq)+I2(s) E∘cell......V? O2(g)+4H+(aq)+2Zn(s)→2H2O(l)+2Zn2+(aq) E∘cell......V?

*April 11, 2014*

**trig**

Given angle x, where 0 <= x < 360 (degrees), cos(x) is equal to a unique value. Determine the value of to the nearest degree. Justify your answer.

*April 11, 2014*

**trig**

How did you get 2x=211 ?

*April 11, 2014*

**trig**

Given angle x,where 0 <= x <= 360 (degrees) solve for to the nearest degree. a)cos(2x) = 0.6420 b)sin(x + 20) = 0.2045 c)tan(90 - 2x) = 1.6443

*April 11, 2014*

**trig**

Given angle x, where 0 <= x < 360 (degrees), cos(x) is equal to a unique value. Determine the value of to the nearest degree. Justify your answer.

*April 11, 2014*

**trig**

Steve - Could you elaborate on your answer please? I don't understand where you got those two numbers from

*April 11, 2014*

**trig**

Given angle x, where 0 <= x < 360 (degrees), cos(x) is equal to a unique value. Determine the value of to the nearest degree. Justify your answer.

*April 11, 2014*

**math**

Number of apartments rented The manager of an 80 unit apartment complex knows from experience that at a rent of £¤300 per unit, all the units will be full.On thw average, an additional unit will remain wacant for each £¤20 increase in rent over £...

*April 11, 2014*

**domestic violence**

why might it be necessary to remove a possible suspect right away from the scene and hold them involuntarily for evaluation at a mental health facility?

*April 11, 2014*

**public speaking**

when speaking about abstract concepts, make them concrete ti the audience by?

*April 11, 2014*

**chemistry**

What would be the final concentration of [K+] if we mix 0.234 L of a solution with a concentration of 1.2M K2CO3 with 312.5 mL of a solution with a concentration of 0.32 M K3PO4

*April 10, 2014*

**chemistry**

Calculate the volume of solution needed to obtain 0.320 mol of KCl from a solution with a concentration of 0.64 mol dm-3

*April 10, 2014*

**College Algebra**

In china, the number of sport utility vehicle sold in 2003 was predicted to grow by 30% annually for the next 5 years. what is the doubling time?

*April 9, 2014*

**chemistry**

If a gas contains 25 ml of oxygen at 37oC and a pressure of 700 mm Hg, what is the volume under STP.

*April 8, 2014*

**Biology**

If a gas contains 25 ml of oxygen at 37oC and a pressure of 700 mm Hg, what is the volume under STP.

*April 8, 2014*

**math**

@other John ....cuz S shows up 2 times.....

*April 8, 2014*

**math**

Marissa, how did you get 7 total letters? There are only 6 letters

*April 8, 2014*

**3**

bobby is in the hospital with two broken nees

*April 7, 2014*

**physics**

The figure shows a nozzle on a hose carrying water. If the pressure at Point 1 is 290 x 10^3 Pa, the velocity 0.64 m/s, and the diameter 20 cm. Given that the diameter at point 2 is 1.4 cm, what is the velocity at point 2? v_2 = What is the pressure at point 2? P_2 =

*April 7, 2014*

**Business**

Bob buys a house for 150,000 with a mortgage rate of 5.8% convertible monthly. At the time of purchase he owns a 10,000 20-year zero coupon bond that earns 4.5% annually. The bond matures in 15 yeas. He would like to use the proceeds from the bond to make a payment larger than...

*April 6, 2014*

**Math**

In a survey of 280 college students, it is found that 67 like brussels sprouts, 93 like broccoli, 60 like cauliflower, 26 like both brussels sprouts and broccoli, 21 like both brussels sprouts and cauliflower, 20 like both broccoli and cauliflower, and 10 of the students like ...

*March 30, 2014*

**chemistry**

What are strongest intermolecular force in hydrogen iodide ?

*March 29, 2014*

**Statistics**

Sorry to ask another question but I keep struggling with this class. If all else remains the same, which of these will make a confidence interval for a proportion narrower? I. Increase the confidence level. II. Increase the sample size. III. Increase the margin of error. A. I ...

*March 29, 2014*

**Statistics**

Which of these statements is always true for a researcher who is using standard statistical methods in a test of significance? A. A researcher who rejects a true null hypothesis has committed a Type II error. B. A researcher who rejects the null hypothesis has computed a test ...

*March 29, 2014*

**math**

Enrique charges $5 for every 1/5 hour he spends walking dogs. In the morning he walks Buttons for 2/5 hour, Bruno for 1/5 hour, and Pepper for 3/5 hour, Monday through Friday. On Saturdays he takes Mimi, Diva, and Coco to the dog park for 4/5 of an hour. On Wednesday this week...

*March 28, 2014*

**math**

thank you just wanted to clear it .thanks to clear my doubth

*March 26, 2014*

**math**

36/1.5 = ? how to divide this

*March 26, 2014*

**math**

There are 50 big cats in the zoo. 2/5 of them are tigers. 1/5 of them are leopards. The rest are lions. How many lions are there in the zoo?

*March 26, 2014*

**math**

kevin bought a 3-foot sandwich for his .Hew figured out that each guest can have 1 1/2 inches of the sandwich . HOW MANY guest does kevin have

*March 24, 2014*

**College Physics**

What's the answer?

*March 24, 2014*

**physics**

Earth is approximately a sphere of radius 6.37 × 106 m. What are (a) its circumference, (b) its surface area, and (c) its volume? please help

*March 23, 2014*

**statistics**

Consider a binomial experiment with 20 trials and a probability of 0.45 on a single trial.Use the normal distribution to find the probability of exactly 10 successes.

*March 21, 2014*

**physics**

What is the momentum of the 200 g cart BEFORE the collision (LEAVE OUT units of kgm/s)? please help.

*March 20, 2014*

**physics**

if the cart in the last question collides INELASTICALLY with a stationary cart of mass 150 g, what is the kinetic energy of the carts after the collision (LEAVE OUT units of J)?

*March 20, 2014*

**Physics**

2.3 meters in 6 meters per second

*March 18, 2014*

**Investment interest**

Scenario: A client comes to you for investment advice on his $500,000 winnings from the lottery. He has been offered the following options by three different financial institutions and requests assistance to help understand which option would be the best for his investment. ...

*March 15, 2014*

**Physics**

497.67

*March 14, 2014*

**please check(Social studies)**

Karen nice job

*March 14, 2014*

**Which of the following is a compound?**

c, CO

*March 13, 2014*

**Language book**

Hi i need help with this book called as for me and my house could you help me with this question When mrs. Bentley decides to plant a garden, the main problem is that according to propriety the mistress of the parsonage should not ___________ a.sow b.weed c.water d.dig Thanks ...

*March 13, 2014*

**science (check answer?)**

Well i also learned this so i got the same question from my school and the answer was they are all metals. Its 100% right

*March 13, 2014*

**Biology**

Are my answers correct? 1. What term describes the relationship of the ankle to the hip? Medial Proximal Distal this one Superior Anterior 2. What term describes the relationship of the nose to the mouth? Superior- this one Deep Anterior Inferior Superficial

*March 12, 2014*

**physics**

An outfielder throws a 1.65 kg baseball at a speed of 59 m/s and an initial angle of 14.2◦. What is the kinetic energy of the ball at the highest point of its motion?

*March 9, 2014*

**Finance**

Cindy has an income of 56,000 in year 0. Calculate her income in year 1 if she wants to consume 40,000 in year 0 and 27,000 in year 1. Assume that the interest rate is 1.5 % per year.

*March 6, 2014*

**Life orientation**

student drop outs rates alarming

*March 6, 2014*

**research**

What are the pros and cons of disguised observation?

*March 5, 2014*

**chemistry 1**

DDT concentrations in ground water. How do you set it up with a sample size of 250.0mL and the mass of DDT at 0.030 and then convert to millimoles. Just can't remember how to set it up.

*March 4, 2014*

**Math**

Thank

*March 4, 2014*

**Math**

How to set up an equation for this problem? Thank you.

*March 4, 2014*

**Math**

Mr. Bailey mowed his yard in 90 minutes. His son Roy mows the yard in 75 minutes. How long will it take them if they work together (using 2 lawn mowers)?

*March 4, 2014*

**algebra**

Brandon hit a baseball upward with an initial speed of 120 feet per second. How much later did Ollie catch the ball? Use the formula h = -16t squared + vt.

*March 4, 2014*

**Physics**

A ball is dropped from a height of 1.45m and rebounds to a height of 1.21m. Approximately how many rebounds will the ball make before losing 92% of its energy?

*March 3, 2014*

**math**

a telephone pole is 64 feet long and 5/16 of the pole must be underground a) what fraction of the pole is above ground

*March 2, 2014*

**Precalculus**

A lattice point is a point with integer coordinates. How many lattice points (x,y) with -100 less than or equal to x less than or equal to 100 and -100 less than or equal to y less than or equal to 100 are on the graph of the parametric equations x=30-40 cos t and y=-50 + 30 ...

*March 2, 2014*

**Precalculus**

That's wrong :( It's not 2pi/3 or pi

*March 2, 2014*

**Precalculus**

Let G be the graph of the parametric equations x=cos(4t)and y=sin(6t). What is the length of the smallest interval I such that the graph of these equations for all t in I produces the entire graph G?

*March 2, 2014*

**Precalculus**

-9 is incorrect, sorry. The answer is also not 6 or -6

*March 2, 2014*

**Precalculus**

Find the sum of all possible values of the constant k such that the graph of the parametric equations x=2+4cos(s) and y=k-4sin(s) intersects the graph of the parametric equations x=1+cos(t) and y=-3+sin(t) at only one point.

*March 2, 2014*

**Precalculus**

Find the sum of all possible values of the constant k such that the graph of the parametric equations x=2+4cos(s) and y=k-4sin(s) intersects the graph of the parametric equations x=1+cos(t) and y=-3+sin(t) at only one point.

*February 28, 2014*

**Precalculus**

Let G be the graph of the parametric equations x=cos(4t)and y=sin(6t). What is the length of the smallest interval I such that the graph of these equations for all t in I produces the entire graph G?

*February 28, 2014*

**Precalculus**

A lattice point is a point with integer coordinates. How many lattice points (x,y) with -100 less than or equal to x less than or equal to 100 and -100 less than or equal to y less than or equal to 100 are on the graph of the parametric equations x=30-40 cos t y=-50 + 30 cos t ?

*February 28, 2014*

**Math**

Another variety of R&Ns has a different set of magical (yet mathematical) properties. Remove exactly 4 candies and 1 additional candy appears in the bag. According to the package, a bag contains 50 candies. What is the maximum number of canies that this variety of R&Ns will ...

*February 27, 2014*

**Math**

R&N is a new candy with magical (yet mathematical) properties. Not all candies are the same size. When removing the largest R&N from a new bag, the bag becomes 1/2 full; removing the second largest makes the bg 1/3 full; removing the third largest makes it 1/4 full, and so on...

*February 27, 2014*

**Math**

Another variety of R&Ns has a different set of magical (yet mathematical) properties. Remove exactly 4 candies and 1 additional candy appears in the bag. According to the package, a bag contains 50 candies. What is the maximum number of canies that this variety of R&Ns will ...

*February 26, 2014*

**Math**

R&N is a new candy with magical (yet mathematical) properties. Not all candies are the same size. When removing the largest R&N from a new bag, the bag becomes 1/2 full; removing the second largest makes the bg 1/3 full; removing the third largest makes it 1/4 full, and so on...

*February 26, 2014*