Sunday

February 7, 2016
Total # Posts: 514

**Chemistry**

Substance X (MW=356gm) is a weak acid. Its Ka is 1.7x10^-3. Calculate pH of725ml of the following solutions: a)Containing 0.187 mol of substance x b)containing 127gm of Substance x I have been trying to figure this problem out for hours now and do not get it. Please help me ...
*April 16, 2013*

**Chemistry**

Does that mean that I do not need to do an ICE table but just use the HH equation?
*April 16, 2013*

**Chemistry**

Calculate the pH of the following buffer solution that resulted from 125ml of 0.1M NH3 with 250ml 0.1 M NH4Cl ( for NH3, Kb= 1.76x10^-5)
*April 16, 2013*

**Chemistry**

Calculate the pH of the following buffer solution that resulted from 125ml of 0.1M NH3 with 250ml 0.1 M NH4Cl ( for NH3, Kb= 1.76x10^-5)
*April 16, 2013*

**Chemistry**

Three metals P,Q and R form three ionic solids with three nonmetals X,Y, ands Z respectively as follows P2X, QY2, and RZ3. If their molar solubilities are the same, how are their Ksp values related? Please not only explain but write the respective dissociation.
*April 16, 2013*

**algebra 2 (permutations & combinations)**

from a standard deck of 52 cards, how many different five-card hands can be drawn?
*April 10, 2013*

**science**

tundra
*April 4, 2013*

**Math**

What property is this? 4(7+9)=(4x7)+(4x9)
*April 2, 2013*

**Math**

One half of 9.76
*April 2, 2013*

**Math**

The sunglasses that Ramon wants to buy are 50% off the original price of 85$ .How much did he have to pay?
*April 2, 2013*

**Math**

What is a attribute?
*April 2, 2013*

**Chemistry**

When 50.0ml of 1.00M HCl is titrated with 1.00M NaOH, the pH increases. calculate the difference in pH of the system when you add 49.99ml NaOH and 50.01ml of NaOH. Please work out detailed steps.
*March 29, 2013*

**Chemistry**

You have two buffer solutions 1) weak acid and its conjugate base 2)weak base and its conjugate acid. Write explicitly ( considering generic formula for acid and base) the equations of neutralization when you: a) add strong acid and strong base 1) b) add strong acid or strong ...
*March 29, 2013*

**Math**

6 quarters, 4 dimes, 3 nickels, 10 pennies. what is the probability you will get at least one of each coin in change of 1 dollar
*March 26, 2013*

**chemistry**

what is the total heat lost if you have 8 grams of copper and the temperature changed from 43°C to 36°C
*March 24, 2013*

**Statistics**

A national caterer determined that 87% of the people who sampled their food said that it was delicious. A random sample of 144 people is obtained from a population of 5000. The 144 people are asked to sample the caterer's food. If sample proportion, P^, is the sample ...
*March 22, 2013*

**NJHS (essay)**

hi, i'm currently applying for the national junior honor society, and i'm working on my essay. any ideas what i should include??? ps. i have no leadership experience and the section is blank! D:
*March 20, 2013*

**Statistics**

Suppose a basketball player is an excellent free throw shooter and makes 90% of his free throws (i.e., he has a 90% chance of making a single free throw). Assume that free throw shots are independent of one another. Suppose this player gets to shoot three free throws. Find the...
*March 17, 2013*

**Basic Math Venn Diagram**

Hi! Having a lot of trouble with this one problem. The venn diagram problem is n(U)-n(B). I realize I did not post the venn diagram, I just need to know how to solve that type of problem using a venn diagram! Help would be greatly appreciated. : ) Thank you so much!! God ...
*March 7, 2013*

**Math**

Thx that really helped😄😃😜😝👍👍❕👏🎓🆗🆕🔝🆒 freind bump🆙
*March 7, 2013*

**Math**

I don't know what 4r=96 means. Also I don't know what 51=3n means!😰😁😱😨📝HELP! It's due tomorrow
*March 7, 2013*

**Physics**

A uniform ladder of 5.0 m long and 12 kg is leaning against the wall (contact with the wall = point b, contact with the floor = point a). The height from the ground to point b is 4m . The wall is frictionless but the floor is not. A painter of 55 kg climbs 75% of the way up ...
*February 24, 2013*

**MATH**

if 5 times a certain integer ìs subtracted from twice the square of the integer the result is 63. find the integer
*February 8, 2013*

**Algebra 1**

In 1991, the federal minimum wage rate was $4.25 per hour. In 1997, it was increased to $5.15. Find the annual rate of change in the federal minimum wage rate from 1991 to 1997.
*February 7, 2013*

**Macroeconomics**

If the economy is at point C what is the cost of one more automobile? One more forklift?
*January 31, 2013*

**chemistry**

a sample of sulphuric acid is 95.7% by mass and has a density of 1.84g/cubic cm.calculate the mass of pure H2SO4 in a 2.00L bottle and volume of acid that contain 200g of pure H2SO4.
*January 26, 2013*

**Environmental Biology**

Identify two different types of businesses or corporations (be as specific as possible) that receive subsidies, through which it could be argued that environmental damage is a result. Briefly describe the environmental damage for each.
*January 19, 2013*

**solid mensuration**

what is the area of a section bounded by a closed elliptical figure in which the major and minor segments measure 60 cm and 45 cm
*January 11, 2013*

**Physics...Help!!!**

given that Earth's surface gravitaitional field strength has a magnitude of 9.80N/kg, determine the distance(as a multiple of Earth's radius re) above the Earth's surface at which the magnitude of the field strength is 3.20N/kg.
*December 20, 2012*

**Economics**

If businesses believe consumption will increase six months from now, everything else held constant, and they begin to increase investment, what do you predict will happen to aggregate demand?
*December 10, 2012*

**Chemistry**

Devise a test to distinguish between Cu2+ and Co2+.
*November 19, 2012*

**Chemistry**

Devise a test to distinguish between Cu2+ and Co2+.
*November 19, 2012*

**Chemistry II**

Devise a test to distinguish between Cu2+ and Co2+.
*November 19, 2012*

**science**

what do oxygen and sugars do in photosynthesis
*November 17, 2012*

**Algebra**

Task Type: Individual Project Deliverable Length: 3 Parts: See Assignment Details Points Possible: 150 Due Date: 11/5/2012 11:59:59 PM CT Weekly tasks or assignments (Individual or Group Projects) will be due by Monday and late submissions will be assigned a late penalty in ...
*November 13, 2012*

**math**

Can someone please help me? I don't know how to work this out, and my friends don't either. Eight hot dogs and ten buns come in separate packages. a. Is the number of hot dog packages proportional to the number of hot dogs? Explain. b. Is the number of hot dogs per ...
*October 28, 2012*

**calculus **

Write a formula for f^-1 (x) if f(x) = (x+5)/(3x-4) and state the domain of F^-1
*October 27, 2012*

**art need help**

Yeah! Connections Academy Questions!!! I need em all!!! Halp!!! The text book is poop on my Mac.
*October 23, 2012*

**physics**

The maximum speed of a child on a swing is 4.90 m/s. The child's height above the ground is 0.525 m at the lowest point in his motion. How high above the ground is he at his highest point?
*October 11, 2012*

**Math**

I really need help
*October 4, 2012*

**7th grade math ms. sue please help**

Me too Tj
*October 1, 2012*

**BIS 245 lab**

need help
*September 27, 2012*

**physics**

A passenger on a moving train tosses a coin with an initial velocity of (-2.25 m/s)x unit vector + 4.26 m/s)y unit vector (from the point of view of the passenger). The train's velocity relative to the ground is (11.5 m/s)x unit vector. (a) What is the minimum speed of the...
*September 16, 2012*

**Math**

There are 36 students in Mrs. Keaton's sixth grade class. If 5/12 of her students are girls, how many girls are in the class? Thanks :-)
*September 11, 2012*

**math**

al has twice as many baseball cards as frank and four times as many football cards as joe. the expression 2x+4y can be used to show the total number of baseball and football cards Al has. If the answer is y, then what is the question?
*August 17, 2012*

**Math**

a jar contains green,red,and blue marbles.The probability of choosing a blue marble is 1/3, the probability of choosing a red marble is 1/2,the probability of choosing a green marble is 1/6.If there are 12 marbles in the jar,and then three green marbles are added,what is the ...
*August 15, 2012*

**Math**

If x-2y-z=2,x-y+2z=9 and 2x+y+z=3,then z=?
*August 13, 2012*

**Math**

the cube has a volume of 8.If point x,the midpoint of AV is joined to point y, the midpoint of edge CD what is the length of the shortest distance from x to y?
*August 8, 2012*

**Math**

John will have to make 180 monthly mortgage payments and the first payment was made on January 15,1989.If he makes one payment each month,in what year will John make his last payment?
*August 8, 2012*

**Math**

John will have to make 180 monthly mortgage payments and the first payment was made on January 15,1989.If he makes one payment each month,in what year will John make his last payment?
*August 8, 2012*

**Math**

If the average of 10 numbers is 10 and the sum of five of the numbers is -25 what is the average of the other 5 numbers?
*August 7, 2012*

**Math**

A professional basketball team has won 50 out of the 75 games played so far.The team still has 45 games to play.How many of these games must the team play in order to have a season record of winning 60% of the games played?
*August 7, 2012*

**math**

If the surface area of a cube is 150e2 what is the volume of the cube?
*August 6, 2012*

**Math**

If x-1/3y=3, then the value of 3x-y-6=? a) 15 b) 9 c) 6 d) 3 e) 0
*August 6, 2012*

**Math**

Thank You
*August 6, 2012*

**Math**

oh i read the question wrong I got D
*August 6, 2012*

**Math**

i got E
*August 6, 2012*

**Math**

Brian rode his motorbike for 3 hours at 50 miles per hour and then rode the next 200 miles in 5 hours.What is the total distance he traveled? a)150 b)190 c)250 d)350 e)1150
*August 6, 2012*

**Math**

1)If a (theres a square)b is defined as the average of a and b, what is the value of 2 (theres a square) 4 (theres a square) 9? a) 3 b)5 c) 6 d)7.5 e) 18 2)If A=(r+s)F, what is the average of r and s when A=8 and F=2? 3) For the three numbers a,j,k, (a<j<k),the ...
*August 5, 2012*

**Math**

1) Mr.Anderson has 3 passenger seats in his car.He offered to drive some of the 5 members of his daughter's club to the movies. How many different groups of 3 passengers could he drive? 2) A jar has green and red marbles.If the ratio of green to red is 3:2,what is the ...
*August 5, 2012*

**Math**

Given (a+2,a-2)= a for all integers a, (6,2)= a) 3 b) 4 c) 5 d) 6 e) 8 The cost of a drive-in movie is $y per vehicle. A group of friends in a van shared the admission cost by paying $0.40 each.If 6 more friends had gone along,everyone would have paid only $0.25 each. What is ...
*August 2, 2012*

**math**

A certain store is selling an $80 radio $64. If a different radio had a list price of $200 and was discounted at 1.5 times the percent discount on the $80 model, what would its selling price be? a) $90 b) $105 c) $120 d) $140 e) $160
*August 2, 2012*

**math**

A certain printer can print at the rate of 80 characters per sound, and there is an average of 2,400 characters per page.If the printer continued to print at this rate, how many minutes would it take to print an M-page report? a) m/30 b) m/60 c) m/2 d) 2/m e) 60/m
*August 2, 2012*

**Math**

If point A is (-3,-2) and point B is (5,5) then what is the length of segment AB to the nearest tenth?
*August 2, 2012*

**Math**

The radius of the small circle A is one-half the radius of the large circle B.WHat is the ratio of the area of the small circle to the area of the large circle?
*July 31, 2012*

**Math**

If a line L with a slope of -2/5 passes through the points (5,0) and (x,-2) then what is the value of x?
*July 31, 2012*

**Math**

To the nearest tenth,what is the circumference of a circle with an area of 49pi?
*July 31, 2012*

**Math**

If Jack's house is 7.1 miles due north of the Senior Citizen Center and Belinda's house is 6.3 miles due west of it, then to the nearest tenth,what is the shortest distance between their houses?
*July 31, 2012*

**Math**

a square in a circle with a radius of 2 pi .What is the perimeter of the square?
*July 31, 2012*

**math**

13/225
*July 30, 2012*

**math**

What is the probability that a randomly selected three-digit number has the property that one digit is equal to the product of the other two? Express your answer as a common fraction.
*July 30, 2012*

**math**

if there are 10 more girls than boys in a club with 60 members, how many are boys?
*June 28, 2012*

**math**

35/27
*June 25, 2012*

**Pre algebra**

How do I solve Quadratic equations by factoring? (for example how would I solve n2 - 10n = -21 if I was supposed to get the answers 7 and 3?
*June 7, 2012*

**Humanities**

Explain the focus on the idea of natural law as an extension of human nature during the conclusion of the seventeenth century.
*June 7, 2012*

**Math**

Carl owe the workers 80hours pay 2 days at 8hours a day is 16 hours day (3)work only 4 hours Total hours work 20 " for 4 workers working 20 hours =20 X 4 =80 hours pay
*June 7, 2012*

**Science**

Please may you find a labeled diagram of a weather thermometer.
*May 27, 2012*

**Math**

How do you simplify products of radicals? Please help!
*May 24, 2012*

**statistics**

On an exam whose scores followed a normal distribution, a student's z-score was +2. What percentage of students scored better than he did? (Use the 68-95-99.7 Rule.)
*April 25, 2012*

**noun**

if two dices are tossed together, the probability that the product will be less or equal to 18 what?
*April 24, 2012*

**Chemistry**

Are hybridized orbitals used to explain the fact that the four bonds in methane are equivalent? If not, what is?
*April 16, 2012*

**Chemistry**

The pH of a 0.100 M solution of an aqueous weak acid (HA) is 4.00. What would the Ka for the weak acid be?
*April 16, 2012*

**physics**

tommy builds a human sling shot that has an elastic constant of 4000 N/m. He puts his little sister in it and pulls it back for 5 meters. How much energy does his 25 kg sister have as she leaves the sling shot and how fast is she flying?
*March 27, 2012*

**maths**

Please I want to know how many litres make a metric tone.
*March 25, 2012*

**STATISTICS**

.868
*March 19, 2012*

**physics**

How would one plug the gravitational constant into an equation? To be honest, I'm having a hard time with the idea of the gravitational constant in general, but I need to solve an equation for the circular velocity of a galaxy. I know I need to multiply the gravitational ...
*March 8, 2012*

**6th Grade Math**

Simon went to the store to buy new school supplies. Simon spent 1/4 of his money on pencils and paper and 1/2 of his money on a backpack. If Simon has $12.50 leftover, how much did the backpack cost?
*March 4, 2012*

**Math**

There are 24 students in Mrs.Smith's 1st block class. 1/4 of the class passed the math test with an A. 12 students in the class passed the math test with a B. What percent of the students in the class passed the test?
*March 1, 2012*

**Math**

There are 24 students in Mrs.Smith's 1st block class. 1/4 of the class passed the math test with an A. 12 students in the class passed the math test with a B. What percent of the students in the class passed the test? ****** This is how I slove the problem, but I stuck in ...
*March 1, 2012*

**physical science **

120ml of a solution whose concentration is 30g/ml was diluted with distilled water by raising its volume to 160cm3. Calculate the concentration of the new solution.
*February 25, 2012*

**Algebra 2**

did you ever get this answer?
*February 21, 2012*

**chemistry**

Pls promise where is the valuefor r in that question
*February 17, 2012*

**math**

I have a question. I think I'm wrong, so I want to ask if it's right. If I do 3/4 x 1 5/6 x 7/4 x (-2 3/8) would the answer be negative?
*February 6, 2012*

**Math**

Given h(r) = 1/(r + 2), find: h(x^2) + 1 Thank You
*February 4, 2012*

**math**

the chef at a restaurant bought 37 pounds of salad for $46.25. how much did she pay for 1 pound of salad
*January 30, 2012*

**chemistry**

9.5 g Butane + 34.0 g Oxygen = 43.5 Then 43.5 - 28.7 g CO2 = 14.8 That is the answer: 14.8 g
*January 22, 2012*

**Precalc**

An ellipse has this Cartesian equation: ((x-2)/5)^2 + ((y-4)/3)^2 = 1 Find the focal radius Find the eccentricity Write the parametric equations for the ellipse Transform into the form, Ax^2 + By^2 + Cx + Dy + E = 0
*January 20, 2012*

**Precalc**

A hyperbola has this Cartesian equation: -((x-2)/5)^2 + ((y+1)/3)^2 = 1 A. Find direction in which it opens. Horizontal? B. Find the coordinates of the center. I think it's (-2,1) or (1,-2)? C. Find the slopes of the asymptotes: m=+- ?
*January 20, 2012*

**Precalc**

The figure shows the pre-image and first iteration for a set of transformations. If the iterations are carried on infinitely, the resulting fractal figure will have dimension given by Dimension=(LogN)/Log(1/r) It tells me to find N and r... What should I be looking for on the ...
*January 19, 2012*