Thursday

September 29, 2016
Total # Posts: 7,992

**chemistry**

Draw “arrows in a box” diagrams to illustrate the ground-state electronic configuration of the following species: 12 6C , 32 2 16 S − 28 14 Si , 57 2 28 Ni + , 35.5 17Cl− , 40 2 20Ca + , 31 15P

*June 22, 2014*

**chemistry**

Sulphuric acid (H2SO4) solution reacts with magnesium metal (Mg) to magnesium sulphate and hydrogen according to: H2SO4 + Mg → MgSO4 + H2 How many litres of 5.00 M sulphuric acid would be required to dissolve 20.00 g of magnesium and how many mol of hydrogen would be ...

*June 22, 2014*

**ALGERBRA**

A STATE LOTTERY IS DESIGNED SO THAT A PLAYER CHOOSES FIVE NUMBERS FROM 1 TO 30 ON ONE LOTTERY TICKET. WHAT IS THE PROBABILITY THAT A PLAYER WITH ONE TICKET WILL WIN? WHAT IS THE PROBABILITY OF WINNING IF 100 DIFFERENT TICKETS ARE PURCHASED?

*June 18, 2014*

**Statistics**

The complement of P(B | A) is 1 - P(B | A). Is it also true that 1 - P(B | A) = P(B' | A), where B' means the complement of B?

*June 13, 2014*

**Math**

In a sample of 78 widgets, 2 were defective. How many defective widgets would you expect in a sample of 468 widgets?

*June 12, 2014*

**science 1 question!!!**

Thanks so much Danny! 4/4 100%

*June 5, 2014*

**Physics (electricity and Magnetism)**

A long straight and thin wire has a charge Q per unit length. It is also carrying a current I. A point charge is moving with a velocity v parallel to the conductor, at a distance d from it. Find the velocity v, supposing a correct direction for the current and the current ...

*June 1, 2014*

**math**

gail borrowed $3600 from a bank to buy a washing machine she pays back the loan in 24 monthly instalments at a simple interest rate of 2% a)calculate the simple interest on the loan b)the total amount to be repaid c)if gail repays the loan in 24 equal instalments ,find the sum...

*May 31, 2014*

**Physics **

A projectile is launched at an angle of 34.0o above the horizontal. The projectile has a mass of 1.50 kg and is given an initial speed of 20.0 m/s. a) What is the initial kinetic energy of the projectile? b) By how much does the gravitational potential energy of the projectile...

*May 30, 2014*

**MATH PLZ HELP**

the guys right 25 is the answer i got 100%

*May 29, 2014*

**Geometry**

If m<AHM = 3x+5 and m<TMH = 7x-27, find m<AHM prntscr(dot)com/3n61w3 For figure required for problem.

*May 27, 2014*

**chemistry**

How much naoh and hno3 is needed to make nano3?

*May 26, 2014*

**maths**

If x and y are positive integers, and square root = y + 3, then y^2 = ?

*May 26, 2014*

**physics**

Gamma rays (ã-rays) are high-energy photons. In a certain nuclear reaction, a ã-ray of energy 0.510 MeV (million electronvolts) is produced. Compute the frequency of such a photon.

*May 24, 2014*

**appliance repair**

Which one of the following letters is used in formulas as the symbol for voltage? A. P B. W C. I D. E

*May 22, 2014*

**Help me? Thanks~**

22. The joints highlighted in the image below are ______________ joints. image of transparent body with the spine highlighted the answer is vertbrate

*May 22, 2014*

**Algebra**

Did you ever get it?

*May 21, 2014*

**help please on this **

Making a vaccine for HIV is difficult because the virus has a rapid rate of (A)__________. This is because it is a(n) (B)________ - its genetic material is RNA instead of DNA.

*May 21, 2014*

**English**

The question was "What lesson or meaning do you think this story held for the British audience of the Victorian Era?" This is for the story The Mark of the Beast by Rudyard Kipling. I was thinking that the answer was that the lesson was that just because someone ...

*May 21, 2014*

**Calculus **

An inverted conical tank is 3m tall and 1m in diameter at its widest point. The water is being pumped out of a spout 2m above the top of the tank. Recall that the density of water is ρ = 1000kg/m^3 (a) Find the work needed to empty the tank if it is full. Include units. (...

*May 20, 2014*

**biology**

budding

*May 19, 2014*

**Chemistry**

could you set this up for the first one for me please then i can do the other two

*May 18, 2014*

**Chemistry **

Calculate ΔG∘ at 298 K for the following reactions. Ca(s)+CO2(g)+12O2(g)→CaCO3(s) 2KClO3(s)→2KCl(s)+3O2(g) CO(g)+H2O(g)→H2(g)+CO2(g)

*May 18, 2014*

**Need help with pre cal hw**

1. A party of hikers walks 8 km from camp on 30 degrees, then turns and walks 6 km on course 160 degrees. Find the magnitude of the net displacement from camp. 2. A ship leaves port A and sails 61.1 km course 131 degrees 50' to point B. Then it sails 76.5 km on course 36 ...

*May 18, 2014*

**Algebra**

Update ?

*May 16, 2014*

**Math 2**

1/5 / 10 = 1/5 * 1/10 = 1/50 So d

*May 14, 2014*

**Algebra**

So we get -10 < -2 +8x and -2+8x<22 now we have -8<8x and 8x<24 so we have -1<x and x<3 thus -1<x<3

*May 14, 2014*

**Algebra**

break into two equations

*May 14, 2014*

**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*

**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*