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How many CDs and videos did the store sell? |
2010-03-01 |
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From dawn:
A used book store started selling CDs and videos. In the first week,the store sold 40 used CDs and videos,at 4.00
per CD and 6.00 per video.The sales for both CDs and videos totaled 180.00 she wrote a system of equations to represent the situation.Then she graph the system of equations
thanks- Dawn
Answered by Tyler Wood. |
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The binomial distribution |
2010-02-27 |
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From Jessica:
A small mobile phone retailer has found that one of their phones has a 12% probability of being faulty and a replacement having to be provided for the customer. They have just
received a trial order for 10 phones from their biggest customer who will take their business elsewhere if 20% or more items are faulty.
i) what is the probability that they will lose their biggest customer?
Answered by Penny Nom. |
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The hypotenuse |
2010-02-27 |
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From Dannielle:
how do you find the hypotenuse if a=8 and b=6?
Answered by Penny Nom. |
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A 25 foot ladder reaches a window 20 feet high |
2010-02-27 |
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From Tanner:
a 25 foot ladder reaches a window 20 feet high. how far is the ladder from the building? how far must the foot of the ladder be moved to lower the top of the ladder by four feet?
Answered by Tyler Wood. |
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Compound interest |
2010-02-27 |
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From Allison:
Have $1000.00 in saving account compound annual interest rate 6%
please calculate what it is worth 3 years, 5 years and 10 years?
Answered by Tyler Wood. |
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Proportionality |
2010-02-27 |
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From Nazrul:
If a is proportional to b then how can I prove that (a^2-b^2) is proportional to ab. Please show me the process in details.
Answered by ms. Dame and Tyler Wood. |
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Four dots are randomly placed on an 8x8 grid |
2010-02-26 |
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From bobbym:
Four dots are randomly placed on an 8x8 grid, compute the probability
that no row or column contains more than one dot.
Answered by Claude Tardif. |
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Ordering fractions |
2010-02-26 |
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From jessie:
I'm having alot of trouble with orderig fractions from least to greatest! I'm in 5th grade....and my problem is, 5/8,1/2, and 3/4
I need to know HOW to order them.........can anyone give me a simple explanation?
Answered by Penny Nom. |
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Ordering fractions |
2010-02-26 |
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From Brianna:
I'm a seventh grader and we're learning about fractions. How would you list the numbers in order from least to greatest?
The options:
A. 9/14 , 17/28 , 11/21
B. 17/28 , 9/14 , 11/21
C. 9/14 , 11/21 , 17/28
D. 11/21 , 17/28 , 9/14
Answered by Penny Nom. |
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If the earth were covered completely with water |
2010-02-25 |
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From don:
If the earth were covered completely with water (over Everest) how many gallons would it be??
Answered by Penny Nom. |
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Résolution d'une équation |
2010-02-25 |
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From sellin:
Il faut que j'exprime x en fonction de m dans l'équation suivante et je n'y arrive pas:
-3x + 1 = (m-1) / 2 * x + (2m + 3) / 5
Answered by Claude Tardif. |
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The test for some disease is 99% accurate |
2010-02-24 |
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From baaba:
Assume that the test for some disease is 99% accurate. If somebody tests positive for that disease, is there a 99% chance that they have the disease?
Answered by Chris Fisher. |
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A linear relationship |
2010-02-24 |
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From Mel:
This table shows the linear relationship between an aeroplane's height (above sea level) and the outside air temperature.
| h (cm) |
120 |
340 |
480 |
600 |
1040 |
T (degrees C) |
14.28 |
12.96 |
12.12 |
11.4 |
8.76 |
Find the gradient and vertical intercept of the function. Write the formula for T.
Answered by Penny Nom. |
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A mixture problem |
2010-02-24 |
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From Nathan:
How many gallons of 60% solution must be added to 40 gallons of a 10% solution to produce a 20% solution?
Answered by Penny Nom. |
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Is 0.1234567891011.... periodic? |
2010-02-23 |
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From Adriana:
0.1234567891011.......Is this fraction periodic ?
Answered by Penny Nom. |
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