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Arrays |
2014-01-18 |
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From Yesenia:
Ray makes an array that has four rows of four counters. He wants to make two more arrays using the same number of counters. He wants more than one counter in each row. What two arrays can he make?
Answered by Penny Nom. |
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Mark's books |
2014-01-18 |
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From Jason:
Mark has 312 books in his bookcases he has 11 times as many fiction books as nonfiction books how many fiction books does mark have?
26
212
286
301
Answered by Penny Nom. |
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The ratio of two shares |
2014-01-17 |
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From Kenneth:
Hello:
Two people share $100.00 as follows: $25.00 and $75.00.
The two share the $100.00 in a ratio of 1 to 3.
I want to think that the two people share the $100.00 in a ratio of 1 to 4.
Can you explain why 1 to 3 is correct and 1 to 4 is not?
I thank you for your reply.
Answered by Penny Nom. |
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A rectangular shaped property |
2014-01-17 |
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From Donna:
If I I have property that is rectangle shaped. I I know the ends are 100 feet how many feet would the sides be to make 5.4 acres
Answered by Penny Nom. |
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An inequality |
2014-01-17 |
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From Rosie:
4x/x-2<3
four x divided by x-2 is less than or equal to 3
Answered by Penny Nom. |
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$9.50 in coins |
2014-01-15 |
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From dana:
you have $9.50 in coins. it has twice as many nickels as quarters and three times as many dimes as nickels. how many of each coin do you have?
Answered by Penny Nom. |
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Five cubes |
2014-01-15 |
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From Bob:
Rick has five cubes. When he arranges them from smallest to largest, the difference between the heights of any two neighbouring cubes is 2 cm. The largest cube is as high as a tower built from the two smallest cubes. How high is a tower built from all five cubes?
Answered by Penny Nom. |
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Watching a bouncing ball through a window |
2014-01-15 |
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From Bob:
A ball falls from the roof, at a height of 10m. After each impact on the ground it bounces back up to 4/5 of its previous height. How many times will the ball appear in front of a rectangular window whose bottom edge is at a height of 5m, and whose top edge at a height of 6m?
Answered by Penny Nom. |
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Is this operation associative? |
2014-01-14 |
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From patrick:
Associative test: Can you explain the following to me?
Is the following operation associative?: x*y=x+y+1
1) x*(y*z)=x*(y+z+1)=x+(y+z+1)+1=x+y+z+2
2) (x*y)*z=(x+y+1)*z=(x+y+1)+z+1=x+y+z+2
The answer is yes as 1) = 2)
My specific questions are:
1) How x*(y*z)=x*(y+z+1)=x+(y+z+1)+1 ?
2) How (x+y+1)*z=(x+y+1)+z+1?
Thank you!!
Answered by Penny Nom. |
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A 7% solution |
2014-01-14 |
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From imran:
what amount of H2SO4 should be added to make 5mL of 0.7% H2SO4 solution
Answered by Penny Nom. |
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Fractions and exponents |
2014-01-11 |
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From john:
what is the exponent form of 9^4/7^-2 and 6^-3/10^-5
Answered by Penny Nom. |
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The train fares are proportional to the square root of distance traveled |
2014-01-11 |
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From manish:
train fares are proportional to the sq .root of distance traveled. the train fare is Rs. 24.4 for a distance of 140 kms. by how much % does the total fare increase if the same distance is covered by breaking the journey after every 35 kms.
Answered by Penny Nom. |
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On what day of the week was July 4, 1904? |
2014-01-11 |
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From Madi:
Hi guys,
I have a question. July 4, 1903, was a Tuesday. On what day of the
week was July 4, 1904? If you could give me an equation that would
work for any question like this, that would be GREAT!
Your fellow math scholar (in training),
Madi
Answered by Penny Nom. |
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A rectangle inscribed in a circle |
2014-01-10 |
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From Marian:
A 16 cm by 12 cm rectangle is inscribed in a circle. Find the radius of the circle.
Answered by Penny Nom. |
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4x^3-7x^2-2x |
2014-01-10 |
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From Alvi:
4x^3-7x^2-2x
Answered by Penny Nom. |
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