Friday
December 9, 2016

Posts by alan

Total # Posts: 376

Chemistry
What is the Net Ionic Equation for Nitric Acid and Potassium Carbonate?
October 12, 2016

Chemistry
What is the concentration in each of the following solutions? A) 240 mL of 0.200 M KNO3 is added to 160 mL of water. B) 2.25g of NaCl is dissolved in 250 ml of water.
October 12, 2016

Chemistry
The quantity of Cl- in a water supply is determined by titrating the sample with Ag+. What mass of chloride ion is present in a 10,0g sample of the water if 20.2 ml of 0.100 M Ag+ is required to react with all the chloride in the sample?
October 12, 2016

Chemistry
7. A student conducts an experiment on a different hydrate. The empty crucible is heated to a constant mass of 24.330. A sample of the unidentified hydrate is placed in the crucible, and the total mass is 31.571 g. The crucible and hydrate are heated to constant mass, which is...
September 28, 2016

maths
Gunpowder contains 75%nitre and10% sulphur.find the amount of gunpowder which carries 9 kg nitre . what amount of gunpowder would contain 2.5kg sulphur
September 26, 2016

Maths
-3x+2y=-6
August 22, 2016

physics
what is the maximum torque on a rectangular coil 5 cm x 12 cm and with 600 turns when carrying a current of 0.0700A in a uniform field with magnitude 0.300T?
August 8, 2016

Chemistry
5 grams of H2 reacts with 16 g of O2, which in excess? 2H2(g)+O2(g)=2H2O(g)
May 21, 2016

math
If the store purchases an item at a wholesale cost of \$3.50 per item, and it is sold at a retail value of \$5.00 per item. What is the gross profit percentage of the item?
April 20, 2016

Geometry
A wheel 2ft wide rolls a distance of .015 miles in .005 hours. What is the wheels speed in rpm's?
March 31, 2016

Geometry
The diagonals of rectangle ABCD intersect at point E. If AE=2x+5, and BD=5x+2, what is AC?
February 24, 2016

Chemistry
Nicotine is a basic substance and its dissociation constant is about 1.0 x 10-6. To prepare a solution water with 0.01 mol L-1, calculate the PH
January 22, 2016

Chemistry
An amount of 25ml of a 0.8 Molar solution of pure KNO3 and placed in a volumetric flask. Is added water until the thin volume reaches exactly 500ml. which the final concentration?
January 21, 2016

Chemistry
An aluminum sheet used for food preservation weighs about 0.05 g/cm-2 How many electrons are in a 1 cm2 of this sheet?
January 21, 2016

algebra
[Question] Can someone please argue with me against 'decreased' being a past-tense word? My interpretation: 3(x - 7) = x + 39. Please EXPLAIN why this is not the case even though it was worded this way. Thank you
June 16, 2015

Math help Steve?
Oh never mind! So the answer would be B?
April 29, 2015

Math help Steve?
1) Given that p(-3), p(-1), and p(5)=0, which expression could be p(x)? A)x^3-x^2-17x-15 B)x^3+x^2-17x+15 C)x^3-3x^2-13x+15 D)x^3-9x^2+23x-15 Hi Steve, I got what you said, but how would I solve this equation then?
April 29, 2015

Math
Hello again! I would appreciate help very much on this. Thank you! 1) For which values of x is y equal to 16 in the equation y=|3x+4|? A) -60 and 36 B) -36 and 60 C) -20/3 and 4 D) 20/3 and 4
April 29, 2015

Math
Oh ok, I understand that. Thank you so much!
April 29, 2015

Math
1. Which function represents an initial population that increases 22% per year where A represents the initial value and X represents time in years? A. Y=A(0.22)^x B. Y=A(0.68)^x C. Y=A(1.22)^x D. Y=A(1.68)^x I do not get how to solve this problem. Any help would be great. ...
April 29, 2015

Math
Thank you so much!
April 29, 2015

Math
Any help would mean so much to me. Thank you!
April 29, 2015

Math
1) Malene rented a compact car for 10 days and drove it 620 miles for a total cost of 412\$. Patrick rented a compact car at the same rental car company for 6 days and drove it 850 miles. His total cost was 295. Which system of equations could be used to determind d, the charge...
April 29, 2015

1) Given that p(-3), p(-1), and p(5)=0, which expression could be p(x)? A)x^3-x^2-17x-15 B)x^3+x^2-17x+15 C)x^3-3x^2-13x+15** D)x^3-9x^2+23x-15 2) Coaches in a football conference had the option to vote for or against a rule change. The table below shows the results. 4 people ...
April 29, 2015

Math
1)If the roots of a quadratic equation are -2 and 3, the equation can be written as A) (x+2)(x+3) B) (x-2)(x+3)** C) (x+2)(x-2) D) (x-2)(x-3) Is the answer B? If someone could help me that would be great.
April 29, 2015

Physics
A constant retarding torque of 12 N*m stops a rolling 0.80 m diameter wheel in a distance of 15 m. How much work does the torque do?
April 4, 2015

Physics
Determine the acceleration of each object, including its direction. Determine the tensions in the two cords.
February 11, 2015

Physics
Three blocks are connected on the table as shown below. The coefficient of kinetic friction between the block of mass m2 and the table is 0.345. The objects have masses of m1 = 3.25 kg, m2 = 1.25 kg, and m3 = 2.50 kg, and the pulleys are frictionless. The Photo: w w w(dot)...
February 11, 2015

algebra
Mary wants to hang a mirror in her room. The mirror and frame must have an area of 7 square feet. The mirror is 2 feet wide and 3 feet long. Which quadratic equation can be used to determine the thickness of the frame, x? (4 points)
February 7, 2015

math
January 19, 2015

Physics
The resonator of a string instrument is commonly an oddly shaped box or a wide thin board. The resonator is not sharply tuned; it responds to broad bands of frequencies and radiates sound at those frequencies from its entire surface area. The response of the body or soundboard...
December 20, 2014

History
Was the only change in science in quantum physics and relativity? I know it changed the way people thought about the predictability of human nature during the enlightenment and the 1st scientific revolution, but how did this contribute to the age of anxiety? I don't ...
December 18, 2014

History
I have to write a 150-200 word essay on it
December 18, 2014

History
What were the major changes in sciences view of the nature of the universe and humanity's place in it between 1850 and 1914? How did these developments contribute to the age of anxiety? How are these changes reflected in philosophy, psychoanalysis, and artistic style ...
December 18, 2014

AP Calc
Wait don't you plus x=14 back in to y=(84-4x)? Cause y then equals 20 in
December 1, 2014

AP Calc
The US Post Office has a limit on the size of packages it will accept for mailing. The length plus the girth must be 84 inches or less. Find the dimensions of the rectangular package with a square end, which will maximize the volume of the package.
December 1, 2014

MATH
Mimi's Market sold 24 heads of lettuce one morning. That afternoon 2/7 of the remaining heads of lettuce were sold. The number of heads left was now 1/2 of the number the market had at the beginning of the day. How many heads of lettuce were there at the beginning of the day?
November 17, 2014

math/set theory
120 quilts were entered into a quilt show. (Traditionally, all quilts were hand stitched but now many are stitched on machines. Appliques are additional pieces of cloth that are sewn on top of the quilt.) In this show, 86 were machine stitched. 44 had appliques applied. 24 ...
November 13, 2014

Social Studies
What are some lifestyles for the following countries: -Kazakhstan -Kyrgyzstan -Latvia -Liechtenstein
October 9, 2014

Physics
A ball rolling with initial velocity of 40m/s(W) undergoes an acceleration of 5.0m/s^2(N) for a period of 6.0seconds. (A) what is the final velocity of the ball? (B) what is the displacement of the ball in the 6.0 sec
October 7, 2014

Physics
A ball rolling with initial velocity of 40m/s(W) undergoes an acceleration of 5.0m/s^2(N) for a period of 6.0seconds. (A) what is the final velocity of the ball? (B) what is the displacement of the ball in the 6.0 sec
October 7, 2014

Maths
Mathew is attending a very loud concert by the discarded. To avoid permanent ear damage he decides to move farther from the stage. Sound intensity is given by the formula I=k/d*d where k is the constant and d is the distance in metres from the listener to the source of the ...
October 1, 2014

math
Fred has 15 cows John has twice as many cows as Fred had when Fred had as many cows as John has now how many cows has John?
September 21, 2014

Organic Chemistry
What ketone or aldehyde would be reduced to produce each alcohol, respectively: a. 3,3-Dimethyl butan-2-ol b. 3-Methyl butan-1-ol c. Benzyl alcohol
May 24, 2014

Biology - Help!!
2 and 5 are wrong for anyone who may use this to answer their test
May 20, 2014

ch
A 0.160-g sample of unknown metal (X) reacts with hydrochloric acid to produce 66.5 mL? Help please
April 23, 2014

Math
Evaluate the expression for the given value. x = 3; y = -5; z = -2 x(yz)^2 - 3(xyz)^0 + 2x^2yz^2 = 3(-5 * -2)^2 - 3(3 * -5 * -2)^0 + 2(3)^2(-5 * -2)^2 = 3 * 100 - 3 * 30 + 2 * 9 300 - 90 + 18 = 228
November 25, 2013

-2(-2)^2 * 3 - 3(-2)(3)^2 * -1 - (-2)(-1) -2 * -4 * 3 - 3(-2) * 9 * -1 (-2)(-1) -2 * -4 * 3 - 6 * 9 * -1 * 2 24 - 108 = -84
November 24, 2013

Math
Evaluate the expression for the given value. x = -2; y = 3; z = -1 -2x^2y - 3xy^2z - xz =
November 24, 2013

Chemistry
In a double-stranded DNA molecule, the percentage of Guanine can never be more than ___%. Why?
November 22, 2013

Chemistry
Which of the following statements must be True? Check all that apply. The number of Adenines in single-stranded DNA equals the number of Thymines. The number of Guanines in single-stranded DNA equals the number of Adenines. The number of Thymines in double-stranded DNA equals ...
November 21, 2013

Math
Solve the following: -6x + 3 <= 25
November 19, 2013

Math
Solve the following. 2(x + 1) - 4 <= 1/4(12x - 24)
November 19, 2013

Math
Evaluate when x = 2, y = -5, z = 3. x^2 - y = 3 3z - 4(y + 1) - y^2 = 0 x - yz = -13
November 19, 2013

Math
Simplify or solve as appropriate. Enter ns if there's no solution or all if the solution is all real numbers. 2 - 3(x + 5)) = 10 X = -7.6 7z + 6 - 2(z + 3) 5 * z 1/2x - 5 = 3/4x + 7 X = -48
November 19, 2013

Math
Using the linear equation y = -3x + 5, complete the table of values (T-Chart) and choose the correct graph. X = -2 Y = _ X = -1 Y = _ X = 0 Y = _ X = 1 Y = _ X = 2 Y = _
November 19, 2013

Math
Using the linear equation y = 5, answer each of the following. Choose all points that would be on this line. (0,5), (5,5), (2,5), (5,2), (-3,5), or (5,-3)
November 18, 2013

Math
Find the x-intercept and the y-intercept of the linear equation 3x + 4y = 12. Write each intercept as an ordered pair.
November 18, 2013

Please check if these math questions are correct
8 = p - 5 Answer: p = 13 21 + y = 35 Answer: y = 14 6x = 54 Answer: x = 9
November 17, 2013

Math
Solve -4x is less then equal to -16. I got x is less then equal to 4. Is this correct I'm kind of confused with this question.
November 17, 2013

Math
Solve for X. X/8 = -4/9
November 17, 2013

Math
Evaluate the following expressions when x = -2, y = 6, and z = -4 y^2 + 3z 5y - 3(x^2 + 1) + z
November 16, 2013

Math
When driving to the beach, you drive 240 miles on 9 gallons of gas. When you arrive at the beach you fill up your gas tank. While there you drive 130 miles and use 5.8 gallons of gas. Round answers to 2 decimal places. What was your gas mileage driving to the beach? What was ...
November 16, 2013

Math
Choose True or False for each of the following. 87% is equivalent to 0.87 True or False 1.29 is equivalent to 129% True or False 0.5% is equivalent t0 0.05 True or False 5.6 is equivalent to 56% True or False
November 15, 2013

Math
Convert each of the following. Round your answer to two decimal places if necessary. 0.68 miles = 43084.80 inches 10259 feet = 3419 yards
November 15, 2013

Math
If a boat travels at 5 miles per hour, how many feet per second does it travel? Round your answer to two decimal places if necessary. 26400 feet per second
November 15, 2013

Math
Three friends go to their favorite seafood restaurant for dinner. They decide to order a crab cake appetizer. When it arrives there are only 2 crab cakes. What fraction of a crab cake will each friend get to eat? 3/2 Write the fraction as a decimal rounded to 2 decimal places...
November 14, 2013

Math
Your favorite chocolate chip cookie recipe makes 4 dozen cookies. Among the other ingredients, the recipe calls for > 1 cup of butter > 2 tsp vanilla extract > 3 cups of flour > 1/2 tsp salt You are asked to make 6 dozen cookies for a party. How much butter, ...
November 14, 2013

Math
Perform the indicated operation and simplify. 1. 1/4 + 1/3 = 2/3 2. 4/7 - 5/6 = 1/6 3. 3/5 * -4/7 = -12/35 4. 10/11 divided by 2/3 = 15/11
November 14, 2013

Math
Is 10.512 * 10^3 written in proper scientific notation? If not rewrite the number in proper scientific notation.
November 14, 2013

Math
You have a table in your living room with a round top that has a diameter of 2 1/2 feet. You would like to put a piece of glass over the top of the table to protect the surface. What is the area of the table top? (Use 3.14 for the value of pi). Write your answer as a mixed ...
November 14, 2013

Math
You pull into a gas station where the sign says the gas costs \$3.679. To fill up your tank you need 20 1/2 gallons of gas. You plan to use your credit card to pay. Rounded to the nearest cent, what will the charge be on your credit card? \$75
November 14, 2013

Math
Perform the indicated operation. Write your answer as a simplified fraction. 1. 1/3 + 0.25 = 7/12 2. 0.3125 - 1/4 = 1/16 3. -7/10 + 0.2 = -9/10
November 13, 2013

Math
Convert the following decimals to a simplified mixed number. 1. 0.33 = 1/3 2. 1.875 = 1 7/8
November 13, 2013

Math
You and your friend ordered a 12 inch pizza to split for lunch. How many square inches of pizza do you each get to eat? Round answer to 2 decimal places. 37.68 square inches
November 13, 2013

Math
You live 35 1/3 miles from your grandmother's house. You're workplace is 7 2/5 miles from your grandmother's house. If you drive by your grandmother's home on the way to work one morning, what is the total number of miles you drove that morning? Write your ...
November 13, 2013

Math
Multiply each of the following. Write your answer as a simplified fraction. 1. 4/7 * 5 = 20/7 2. 15/28 * 7/9 = 105/252 3. -3 1/5 * 7/8 = -56/20
November 13, 2013

Math
Add each of the following. Write answer as a simplified improper fraction. 1. 3/25 + 8/35 = 61/175 2. 5 1/4 + 3 5/12 = 26/3 3. -4 1/2 + 2 2/3 = -19/6
November 13, 2013

Math
-3 7/16 = -41/16 = -2.56 25/13 = 1.92
November 13, 2013

Math
Convert the following fractions to decimals. Round to 2 decimal places if necessary. 1. 1/4 2. -3 7/16 3. 25/13
November 13, 2013

Math
Simplify each of the following. 1. 42/48 2. -15/35 3. 119/210
November 12, 2013

Math
Write as an improper fraction. 1. 7 3/5 2. -12 1/2 3. 41 4/6
November 12, 2013

Math
Write as a mixed number. 1. 13/11 2. -33/6
November 12, 2013

Math
My son doesn't how to do 15+37
October 23, 2013

Algebra
I think it 32
October 21, 2013

What series of events led to the end of Egypts power in the Nile River Valley?
September 26, 2013

History
September 2, 2013

chemistry
How many moles of H2O are needed to react with 15.0g of CaO forming Ca (OH)2? CaO + H2O --> Ca (OH)2
July 15, 2013

I have this weird question that has to do with linear equations (I think), and this is what it says. Let f(x) = 4x - 5 A. Find f(3) B. Find x when f(x) = -21 Can somebody help me understand this??
May 31, 2013

Math
The parabola, B, represents a shuriken's maximum throwing distance, which was 60 meters of the enemy ninja, A, from a height of 7 meters. Figure out the trait of the enemy ninja that can be observed from the ellipse formed by the shuriken, and figure out the maximum ...
May 24, 2013

Chemistry
N-type silicon (Si) has been produced by doping with phosphorus (P). The charge-carrier population based on electrical conductivity measurments is determined to be 3.091*10^17 carriers/cm3 at room temperature. 1. Calculate the doping level of P (how much P has been added to ...
April 25, 2013

Chemistry
A glass of composition 85% SiO2 - 15% K2O is to be surface strengthened by ion exchange. To this end, two identical specimens approximately the size and shape of credit cards are soaked for the same amount of time at 850∘C. Sample A is soaked in NaCl and sample B is ...
April 13, 2013

Chemistry
Consider the heterogeneous equilibrium process shown below. C(s) + CO2(g) 2 CO(g) At 700.°C, the total pressure of the system is found to be 3.87 atm. If the equilibrium constant KP is 1.52, calculate the equilibrium partial pressures of CO2 and CO.
February 23, 2013

Algebra
What is x when 6(x+4)+4(x+5)=74
February 7, 2013

Algebra
What is x when 6(x+4)+4(x+5)=74
February 7, 2013

Algebra
Subtract. [2x/(x^2-y^2)]-[7/(y-x)] Thank you! :)
January 16, 2013

math
Lin-Yee is helping to set up a health clinic in Inuvik by collecting and shipping medical supplies from Calgary. She has found these shipping rates online: • regular rate: \$2.10/lb • ship 101 to 500 lb, get a 20% discount • ship over 500 lb, get a 40% discount A...
January 15, 2013

math
A male moose is 2.6 m tall and 3.2 m long, with antlers that are 1.2 m across. An artist wants to carve scale models of the moose. She uses a scale factor of 1/30. a) What are the dimensions of the carvings to the nearest centimetre? b) How many carvings can she make using ...
January 14, 2013

math
The butcher shop sells a 3 lb package of chicken legs for \$9.57. The supermarket sells chicken legs for \$7.68/kg. Determine the price per kilogram that each store charges. Which store has the lower price per kilogram?
January 14, 2013

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