02/12/16

original price
After a 70 % ?reduction, you purchase a new DVD player on sale for ?$168. What was the original price of the DVD player??
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02/11/16

grade 12 university chemistry question
A 1.81g sample of ZnS was reacted with 25.0 mL of a nitric acid solution that had a concentration of 0.836 mol/L. One of the products of this reaction is Sulphur. It was collected at the end of the... more
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02/11/16

CD'S have the dimensions shown in the figure ( 7.5 mm internal radius, 60 mm external radius ). Each CD is 1.1 mm thick.
Find the volume, in cubic millimeters, of a stack of 24 CD's. Use 3.14 for pie. Round your answer to to the nearest tentg.
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02/11/16

If (0, 2) maps onto (-3, -5), then (8, 5) maps onto _____? (ans choices in description)
please help.  1) (5, -2) 2) (5, 2) 3) (5, 0) 4) (-5m, 0)
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02/08/16

Equation for carboxylic acids and their derivatives
Write an equation for the reaction of ethanoic acid with sodium carbonate. How does this reaction compare with that of hydrochloric acid with sodium carbonate?   They look into: What does this... more
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02/07/16

Science Question
You need to add ___ J of heat to raise the temperature of 100 grams water by 14 defrees celsius.  
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02/06/16

What 2 types of bonds does carbon most commonly form with other elements?
I am trying to learn what types of bonds carbon typically forms with other elements?
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02/04/16

terms and sequences
List the first 6 terms of the sequence below.   (−1)^(n−1)/2n
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02/02/16

Three apples and two peaches cost $3.00. Four apples and one peach cost $2.75. Find the cost of each
I know it is a system of equations problem. I need help with those equations
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02/02/16

The point P is on the unit circle. The standard angle associated with P is 60°. What...
The point P is on the unit circle. The standard angle associated with P is 60°. What is the x-coordinate of P?
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02/02/16

could someone help me with this math sentence?
Four times the difference of a number and four is four. Find the number. the number is...
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02/02/16

A small statue of mass
A small statue has a mass of 723.4g and displaces 68.6mL of water when added to a container of water.   a.) What is the density of the solid used to make the statue?   b.) You need to determine... more
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02/02/16

Chemistry question
A patient must take 1000mg of a prescription medication three times a day.a.)How many 500mg tablets are required to fill a month prescription?b.) If the cost of a tablet is 17 cents, how much will... more
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01/31/16

an element and an atom are different but related because a particular element is made up of many different types of atoms
I need help on ths question
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01/31/16

If a teacher gives 7 stickers to each student in the class, she will have 24 stickers left. She is 32 stickers short of giving each student 9 stickers.
How many students are in the class and how many stickers does she have?
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01/31/16

How much water should be added to 3 gallons of pure alcohol in order to obtain a solution that is 15% alcohol?
How many gallons?
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01/30/16

The angle b/w a 250lb force F & vector AB=2i+3j is 52 degrees. Find the work done by F in moving an object from A to B.
I am confused 
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01/29/16

graph and explain: walk between house a and house b that are 20 meters apart at a rate of 2 meters per second. graph the distance from house a over time
 if it linear and what does the graph look like
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01/28/16

paula goes to work 3 days a week. On any day, the probability that she takes red bus=1/4. What is probability she goes to work on a red bus on exactly two days
probability for this problem HELPP
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01/28/16

The difference between two numbers is 12. If 20 is added to twice the larger number, the result is 4 more than 3 times the smaller
number. Find the two numbers.
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01/27/16

Calculate the vapor pressure of a solution? CHEMISTRY - Please check my answers??!!
Calculate the vapor pressure of water above a solution made by adding 15.0 g of lactose (C12H22O11) to 100.0 g of water at 338 K. (vapor pressure of pure water at 338 K is 187.5 torr) P (vapor... more
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01/27/16

CHEM HELP PLEASE? Solution problem involving mass percent? What is the mass % of ammonium chloride in the solution?
At 20°C, a 3.54 M aqueous solution of ammonium chloride has a density of 1.0512 g/mL. The formula weight of NH4Cl is 53.50 g/mol.options:6.953.360.2974.1018.00I know mass % = mass of solute/mass of... more
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01/26/16

Please help... I need explanation and answers thank you!
Question #1A 1335 mL sample of oxygen (O2) was collected by displacement of water at 24 degrees celsius under a total barometric pressure of 425 torr. What mass of dry oxygen was collected? The... more
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01/24/16

Applied calculus
Write the function below in the form Upper P equals Upper P Subscript 0 Baseline a Superscript t. Is this exponential growth or exponential decay?   P=2e^-2.3t   Round the base of the... more
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01/20/16

How do you solve this?
A grocer knows that if he sells his canned hams for $8 each, he can sell 950 per month, and if he sells the same hams for $10, he will sell 900 per month. Assuming the relationship between price... more
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