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Units digit |
2008-01-11 |
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From Robin:
hello - my question is:
what is the units digit of (13) to 4; (17) to 2 and (29) to 3
[(13)4(17)2(29)3]
(possible answers: 9 or 7 or 5 or 3 or 1)
Answered by Penny Nom. |
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A circle of diameter 12 cm |
2008-01-11 |
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From Marcy:
The diameter of the circle is 12cm. I need to convert the diameter to m2.
Answered by Penny Nom. |
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Linear systems |
2008-01-10 |
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From Sandra:
I have two questions. Please solve both. Thank you.
1.) In your chemistry class, you have a bottle of 5% boric acid solution and a bottle of 2% boric acid solution. You need 60 milliliters of a 3% boric acid for an experiment. How much of each solution do you need to mix them together?
2.) You plant a 14-inch hemlock tree in your backyard that grows at a rate of 4 inches per year and an 8 inch blue spruce that grows at a rate of 6 inches per year. In how many years after you plant the trees will the trees be the same height? How tall will each tree be?
Thank you. I did not understand neither problem, so I could not show any work. Please help.
Answered by Stephen La Rocque and Harley Weston. |
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cosX= -1.25 |
2008-01-10 |
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From Stephanie:
Why isn't there really a solution for the equation: cosX= -1.25 ?
Answered by Stephen La Rocque. |
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Average Yearly Percentage Change |
2008-01-10 |
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From Ray:
It's about average test scores over a three year span. If the scores were:
2005- 52.6%
2006- 42.5%
2007- 45.5%
What is the average amount they changed each year in three years?
Answered by Stephen La Rocque and Harley Weston. |
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Hoisting an anchor |
2008-01-10 |
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From ron:
four men on a boat are using a capstan for hoisting an anchor weighing 2000lbs. The diameter of the barrel of the capstan at the section in use is 8in., and the pull on the chain carrying the anchor and passing around the capstan barrel is assumed to act at a distance of 1in. from the surface of the barrel. If the distance from the axis of the barrel to each point at which effort is applied to a capstan bar is 40in., what force must be applied by each man hoisting the anchor?
Answered by Stephen La Rocque. |
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Arithmétique modulaire |
2008-01-10 |
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From hausknecht:
ma grand mère a entre 60 et 80 ans.il y a un an son âge était un multiple de 3.dans deux ans son âge sera un multiple de 2,de 3 et de 9.cette année , c'est un multiple de 5.quel est l'âge de ma grand mère?
Answered by Claude Tardif. |
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Forces on an inclined plane |
2008-01-10 |
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From Ron:
A body that weighs 540lbs is caused to slide up an inclined plane with a uniform velocity by a force that acts parallel to the plane. For each foot of horizontal distance, there is a vertical rise of 2in. If the coefficient of sliding friction is 0.16, what force is required to move the body?
Answered by Stephen La Rocque. |
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Base salary plus commission |
2008-01-10 |
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From mike:
i need some help with this word problem.
in november 2001, hall kinion advertised an account executive position in savannah
georgia for a salesperson with experience selling internet services. the job
advertised a 3500 dollar base salary and 24000 dollar to 48000 dollar in
commissions in the first year. Assuming a 20 percent commission rate, how many
dollars in sales would u have to generate to earn 64000 dollars annually.
Answered by Penny Nom. |
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Seven circles in a circle |
2008-01-10 |
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From fae:
what is the area of the remaining portion of a large circle with radius 12cm and the seven smaller and equal circles just fit inside?
Answered by Penny Nom. |
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Sqrt(x^2 + y^2) |
2008-01-10 |
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From Darcie:
Can you simplify this problem?: square root of (x squared plus y squared).
Note: x squared plus y squared is under the radical.
Answered by Penny Nom. |
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A plywood sheet in a doorway |
2008-01-10 |
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From albetel:
adoor is 7 feet tall and 36 inches wide. what is the widest sheet of plywood that can fit through the door?
Answered by Penny Nom. |
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2(x - 5) + 45 = 4 - (3 - 2x) |
2008-01-09 |
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From Kieran:
Solve
2(x-5)+45=4-(3-2x)
Answered by Penny Nom. |
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How do I write the following in exponential form? |
2008-01-09 |
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From Mandy:
How do I write the following in exponential form?
( square root of a^-2 b)^5
Answered by Penny Nom. |
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0.18 of an acre |
2008-01-09 |
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From susan:
what is the square footage of .18 of an acre of land?
Answered by Penny Nom. |
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