Sunday
October 26, 2014

Posts by David


Total # Posts: 1,685

Algebra
The floor of a dance studio is covered with 615 tiles. The owner of the studio replaced the tiles last year. The tiles cost $15 for a set of 8 and $2 for each additional tile. What is the monthly increase the owner charged each of her 34 students over a 6-month period to cover...
February 26, 2013

Algebra
There are 435 tiles, not 615. Sorry.
February 26, 2013

Vocabulary
I need help with writing sentences using my vocabularywords
February 26, 2013

Chemistry
Q1: You wish to prepare a buffer solution with pH = 11.10. What volume of 6.0 M HCl would you add to 500 mL of 0.10 M (C2H5)2NH to prepare the buffer? You may assume that the solution’s volume remains constant. Q2: What is the resulting pH when 20 mL of 0.20 M NaOH is ...
February 24, 2013

Physics
A simple pendulum in a certain planet is found to vibrate 50 times in 100s. Find its (a) period, (b) its frequency. (c) When 1.5m of its length is cut, it vibrates 50 times in 50 s. Find the original length of the pendulum. thanks in advance
February 16, 2013

Math
the length of a rectangular garden exceeds its width by 8 feet. if each side of the garden is increased by 2 feet, the area of the garden will be increased by 60 square feet. find the dimensions of the original garden
February 15, 2013

Applied maths
Evaluate in the domain of complex variables. a) [3(cos⁡〖55°〗+j sin⁡〖55°〗 )]^2 b) (5.0/15°)^3 c) (52/42°)^(1/2) d) ∜4
February 13, 2013

Applied maths
When a capacitor , charged to a voltage , is discharged through a resistor , the current will decay exponentially according to the following equation: i=E/R e^(-t/RC) If E=250 V,C=160 μF and R=2100 Ω, answer the following questions: a) What is the maximum current in...
February 13, 2013

Applied maths
2. When light passes through a transparent medium, its intensity I at a depth d can be modelled using the equation where I0 is the initial intensity, and k is a constant. If the intensity of sunlight is reduced to 54% of its original value after penetrating through a depth of...
February 13, 2013

Aplied maths
1. A steel plate initially at 21.2°C is placed in a furnace at 785°C for 58.0 minutes. While in the furnace the temperature of the plate increases at a rate of 4.18% per minute. After 58.0 minutes, the plate is removed from the furnace and placed on a concrete slab to ...
February 13, 2013

Trignometry
A car is moving at a rate of 55 mph and the diameter of its wheels is 2 feet. A) Find the number of revolutions per minute the wheels are rotating. B) Find the angular speed of the wheels in radians per minutes.
February 12, 2013

Chemistry
If I titrate a sample containing Ammonium Sulphide with a 0.05m Cadmium chloride until an end point is reached, how do I calculate the % sulphide in the sample
February 8, 2013

Physics
An ideal refrigerator-freezer operates with a COP = 8.0 in a 28°C room. What is the temperature inside the freezer?
February 7, 2013

Chem ap
What is the concentration of cations of a 2 molar CoCl3 solution?
February 7, 2013

math
8 students share 5 yds of ribbon equally, what fraction does each student get?
February 6, 2013

Math
A box with a height of 2 centimeters has a volume of 24 cubic centimeters. The length is three times longer that its width. What is the length of the box?
February 4, 2013

Math
Ms. Quon discovered that 40 students liked soccer, 20 liked basketball, 10 liked football, and 5 liked swimming. How many times as many students liked basketball as football? Soccer as football?
January 30, 2013

Chemistry
yes it isa question
January 28, 2013

Chemistry
a sample of silver chromate has a mass of 78.6 grams?
January 28, 2013

Physics
The speed of the head of a redheaded woodpecker reaches 3.4 m/s before impact with the tree. The mass of the head is 0.060 kg and the average force on the head during impact is 5.0 N. a)Find the acceleration of the head (assuming constant acceleration) (b) Find the depth of ...
January 27, 2013

Chemistry
Calculate the molality of HCl in an aqueous 12M HCl solution that has a density of 1.20g/mL
January 22, 2013

programming logic
The Banking e-Teller system allows bank customers to perform ATM transactions from their cell or smart phones. BET will allow customers to check balances, make remote photo capture check deposits, and perform balance transfers to their checking or savings account. It is time ...
January 22, 2013

Math
approximate 1802 ft
January 20, 2013

Math
A single card is drawn from a deck. Find the probability of selecting a 10 or a diamond.
January 13, 2013

chemistry
at 20 C the vapor pressure of dry ice is 56.5 atm. if 32 g of dry ice is placed in an evacuated .25 l chamber at a constant temperature of 20 C will all the dry ice sublime
January 13, 2013

chemistry
at 20 C the vapor pressure of dry ice is 56.5 atm. if 32 g of dry ice is placed in an evacuated .25 l chamber at a constant temperature of 20 C will all the dry ice sublime
January 13, 2013

physics
an electron with a mass of 9.11 x 10^-31 kg is accelerated from rest across a set of 150 V and are separated by 0.80 cm. a) determine the kinetic energy of the electron after it crosses between the plates.( ans 2.4 * 10^-17 j) b) determine the final speed of the electrons. (...
January 12, 2013

science
How would you find a mass of a rolling marble?
January 8, 2013

R&slotto pool
What are the possible numbers to play for todays club master lotto pool
December 20, 2012

principal management
Discuss how the path-goal theory of leadership and the expectancy theory of motivation are related
December 19, 2012

principal management
8. (TCO8) Briefly explain what is meant by objective and judgmental performance evaluation. Discuss two methods of judgmental evaluation. (Points : 10)
December 19, 2012

5th grade math
Ryan worked 1 3/4 hours one day and 2 3/4 hours the next day. Estimate the total number of hours he works on both days combined.
December 16, 2012

MATH HELP Algebra
An illustration of the associative property of addition provide an example
December 13, 2012

Please HELP with this storie problem
I need help with some of the problems I have all ready posted please help me
December 13, 2012

Please HELP with this storie problem
Dave buys 3 green peppers and 2 red peppers for $3.45. Ruth buys 4 green peppers and 3 red peppers for $ 5.00. Find the price of each variety of pepper.
December 13, 2012

MATH help PLZ provide an example
An illustration of the associative property of addition provide an example
December 13, 2012

MATH help PLZ provide an example
An illustration of the associative property of addition provide an example
December 13, 2012

Math help give example
A third degree polynomial of one variable with four terms written in descending order
December 13, 2012

Math help storie problem
Dave buys 3 green peppers and 2 red peppers for $3.45. Ruth buys 4 green peppers and 3 red peppers for $ 5.00. Find the price of each variety of pepper.
December 13, 2012

Math help give an example
The equation of a line that is perpendicular to the line y=-7x+4
December 13, 2012

Math help give an example
The equation of a line that passes through (0,0)
December 13, 2012

Math help plz
To determine the number of fish in a lake , a conservationist catches 500 fish, tags them, and releases them into the lake. Later, 120 fish are caught and 25 of them are tagged. Estimate the number of fish in the lake.
December 13, 2012

How do I solve for w
W^2+48^2=50^2
December 13, 2012

Math help
Find the width of a recctangle that has a length of 48 cm a diagonal of 50 cm.
December 13, 2012

Solve for x math help
(x-4)^2=12
December 13, 2012

Math solve for x
X^2-4x-24=0
December 13, 2012

chemistry
Yes theanwser would be anwser B
December 13, 2012

Math storie problem
The perimeter of a rectangle is 82 yards. The length is two yards more than the width. Find the dimensions of the rectangle.
December 13, 2012

MATH help PLZ sole for x:
Solve for x: X-1/x = 3x/x-2
December 13, 2012

Please help me out I can't figure out how to do th
Graph this equation: x=-3 PLZ show the steps of how you got it.
December 13, 2012

Math story problem
Melissa and Emily leave by car from the same location traveling in opposite directions. Melissa leaves at 4:00 traveling at 55mph. Emily leaves at 5:00 traveling at 60 mph. At what time will they be at 325 miles apart?
December 13, 2012

I don't know the quadreatic formula for this
X^2 x+2=82, x^2+2x=82
December 13, 2012

Math HELP
Write the equation of the line (in slop/intercept form) that has a slop of 7 and goes through the point (6,4).
December 13, 2012

Math
The perimeter of a rectangle is 82 yards. The length is two yards more than the width. Find the dimensions of the rectangle.
December 13, 2012

NEED Help math
Graph this equation : X=-3 on a graph PLZ and show how you did it please
December 13, 2012

Algebra help PLZ NOW
Graph the following equation : 2x-3y=-6
December 13, 2012

Math help algebra HELP plz
Solve A collection of dimes and quarters is worth $7.65. There are 45 coins in all . How many of each are there?
December 13, 2012

NEED help ON MATH PLZ
Graph the solution set on a number line : 3x+4>-8
December 12, 2012

Math Help now !!!! Plz
Solve using the quadratic formula X^2-4x=21
December 12, 2012

MATH Help NOW!!!! Plz
Solve 3x^2 -49=0
December 12, 2012

algebra 2
262144
December 12, 2012

Math help plz
Solve 3x^2-49=0
December 12, 2012

Math help NOW!!!!! Plz
Solve by completing the square : 2x^2= 9x+5
December 12, 2012

Algebra
Thanks steve
December 12, 2012

Algebra
Solve by completing the square: x^2+3x-28=0
December 12, 2012

Chemistry
If the half-life of uranium-235 is 7.04 (times) 10 (to the eight power) 8 y and 12.5 g of uranium-235 remain after 2.82 (times) 10 (to the ninth power) y, how much of the radioactive isotope was in the original sample?
December 11, 2012

Chemistry
If the half-life of uranium-235 is 7.04 (times) 10 (to the eight power) 8 y and 12.5 g of uranium-235 remain after 2.82 (times) 10 (to the ninth power) y, how much of the radioactive isotope was in the original sample?
December 11, 2012

Chemistry
Carbon-14 has a half-life of 5730 y. How much of a 144 g sample of a carbon-14 will remain after 1.719 (times) 10 4y?
December 11, 2012

Chemistry
Carbon-14 has a half-life of 5730 y. How much of a 144 g sample of a carbon-14 will remain after 1.719 (times) 10 4y?
December 11, 2012

Chemistry
Dr. Bob, I don't need ur criticism now!! I need your help to resolve these problems
December 11, 2012

Math 10-3
the work i got from my math teacher says Determine the surface area of each right rectangular prism to the nearest square unit. Any Help with that?....
December 7, 2012

math
In 2 minutes, a conveyor belt moves 300 pounds of recyclable aluminum from the delivery truck to a storage area. A smaller belt moves the same quantity of cans the same distance in 6 minutes. If both belts are used, find how long it takes to move the cans to the storage area.
December 4, 2012

math
Three times the reciprocal of a number equals 9 times the reciprocal of 6. Find the number.
December 4, 2012

lenguage arts
examples of similes
December 3, 2012

lenguage arts
similes
December 3, 2012

Math
look in your moms ass
December 1, 2012

ACCOUNTING
Mills Company uses standard costing for direct materials and direct labor. Management would like to use standard costing for variable and fixed overhead. The following monthly cost functions were developed for manufacturing overhead items: Overhead Item Cost Function Indirect ...
December 1, 2012

math
Please, help me! 5/(x^2 - 4) + 2/(x^2 - 4x - 3) - 3/(x^2 - x - 6)
November 29, 2012

math
Please help me solve it
November 28, 2012

math
denaminator* (LCD)
November 28, 2012

math
Yes,I need to simplify it and find least common denamotator.
November 28, 2012

math
5/x^2-4+2/x^2-4x+4-3/x^2-x-6
November 28, 2012

Help ASAP calculus
Which is the 7th term in the sequence of the squares of all odd numbers starting from 1? 144 169 196 200 225
November 28, 2012

Urgent help calculus
If the area in square units of the region under the curve of the function f(x)=5, on the interval from x=a to x=8 is 20 square units what is the value of a? 4 5 6 7 8
November 28, 2012

Math
6y + 5x = -15. Find three solutions of the equation
November 22, 2012

chemistry
The pressure in car tires is often measured in pounds per square inch (), with the recommended pressure being in the range of 25 to 45 . Suppose a tire has a pressure of 33.5 . Convert 33.5 to its equivalent in atmospheres.
November 20, 2012

chemistry
The pressure in car tires is often measured in pounds per square inch (), with the recommended pressure being in the range of 25 to 45 . Suppose a tire has a pressure of 37.0 . Convert 37.0 to its equivalent in atmospheres.
November 20, 2012

Maths
3. Ohm’s law states that the current flowing in a circuit varies directly as the applied voltage and inversely as the resistance. In an experiment, the resistance was increased by triple the percentage by which the voltage was increased. A student calculated the percent ...
November 17, 2012

math
A chemist has 30%, 40 % and 80 % acid solutions. All three were to be mixed to make 4.00 x 102 L of 38% acid solution but a mistake was made and the amounts of 30% and 80 % were reversed. The result was 4.00 X 102 L of 65 % acid solution. What were the amounts of each solution...
November 17, 2012

Physics
A stone is thrown from the ground with initial velocity v0 directed at angle alpha with respect to the horizon. Find equations of its motion both in x and y directions.
November 10, 2012

maths
3.An 1145 L tank contains 295 L of water and is being filled with brine from a full 1280 L tank at a rate of 1.55 U.S. gallons every 6 seconds. Will the smaller tank ever contain three times the amount of liquid as the larger tank? If so, when? If not, explain why.
November 4, 2012

maths
2. A bar of uniform section is 81.4cm long and weighs 4.45 kg. A weight of 12.8 kg is suspended from one end. The bar weight combination is to be suspended from a cable attached at the balance point. a)Determine how far from the weight should the cable be attached. b)Calculate...
November 4, 2012

maths
A large canal will have a cross-section in the shape of an isosceles trapezoid. The top will be twice as wide as the bottom, and the depth will be 8.00 m. Because of the cost of the building materials, the bottom and two slopes sides are to measure 14.0 m altogether. What is ...
November 4, 2012

math
how many ounces of liquid can be contained in a glass jar that is 5" tall and 3" in diameter (1 gallon =231 cubic inches)
November 4, 2012

CHEM!
A gas mixture contains 0.60 mol of N2, 0.10 mol of H2, 0.20 mol of CH4. Calculate the pressure of the gas mixture and the partial pressure of each constituent gas if the mixture is in a 6.0 L vessel at 27C. What is the: Total pressure Pressure of H2 Pressure of N2 Pressure of ...
October 29, 2012

Physics
The particles in the figure below (m1=1.6 kg and m2=3.5 kg) undergo an elastic collision in one dimension. Their velocities before the collision are v1i=12 m/s and v2i=-7.5 m/s. Find the velocities of the two particles after the collision. (Indicate the direction with the sign...
October 27, 2012

Physics
A railroad car (m=3000 kg) is coasting along a level track with an initial speed of 22 m/s. A load of coal is then dropped into the car as sketched in the figure below. (a) What are the velocities of the car and the coal before the collision along the x direction? Vcar=____m/s...
October 27, 2012

Finance
x = 33.96
October 24, 2012

MATH - ALGEBRA
Classify as Monomial, Binomial or Trinomial 8X2-3/5 X+35 Please help.
October 22, 2012

math
it is not less than 40. it is not greater than 70. it is not an odd number. it does not have an even number in the tens place. it does not have a 4 in the ones place. it does not have a 6 in the ones place. what is the mystery number?
October 18, 2012

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