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Orbital velocity 2006-02-15
Lizzie pose la question :

Assume the world is a spherical planet with a diameter of 1600 KM. with a uniform density or 5200 KM.

It the moon is in a circular orbit of 630 KM. above the surface of the world,what is it's orbital velocity in metres per second?Round to the nearest WHOLE number.


Stephen La Rocque lui répond.
8 - 5r / 6 = 3 2006-02-15
Scott pose la question :
I was trying to help my daughter with the following problem:

8 - 5r / 6 = 3

Can you give me a quick refresher.


Stephen La Rocque lui répond.
A normal distribution problem 2006-02-15
Mary pose la question :
In a certain normal distribution, find the mean when the standard deviation is 5 and 5.48% of the area lies to the left of 78.
Penny Nom lui répond.
Percent gain 2006-02-14
Bill pose la question :
If a stock is bought at $3.50 and sold at $5.80, what percent was the gain?
Penny Nom lui répond.
How many flat surfaces does a cylinder have? 2006-02-14
Kimia pose la question :
How many flat surfaces does a cylinder have?
Stephen La Rocque lui répond.
Zhi Wei was born on christmas day in 1983. 2006-02-14
Clement pose la question :
Zhi Wei was born on christmas day in 1983. His father shares the same birthday, but he was born in 1951. In which year will Zhi Wei's age be exactly 1/3 of his father's age?
Stephen La Rocque lui répond.
Victor's profit 2006-02-13
Millie pose la question :
victor is trying to make money buying and selling cars. he saved up and buys a car for $2500 and then sells it for $4327.he then buys another car using 2/3 of his profit and sells it for twice what he paid for it. how much money did victor make during these transactions?
Steve La Rocque lui répond.
Golfing with 8 or 12 2006-02-13
Carolyn pose la question :
I have a couple of questions that my dad asked me and I do not think it can be done in the manner he wants it to come out to.

He is going on a golf trip in June. There are going to be either 8 or 12 players playing 4 rounds of golf.

The questions that he says will not work and I do not know how to figure it out either is

4 Rounds of golf is for sure. 18 hole Rounds each

4 Players to a group

Either 8 or 12 players can every player play with every player in a group at least once during those 4 rounds.

If this can be done can you give me the combinations for both 8 and 12 , so I can help out my dad. Along with how you you figure this out.

Penny Nom lui répond.
A concrete slab 2006-02-13
Cheryl pose la question :
A concrete area that will be used for picnic benches will measure 20 ft on each side. The concrete slab will be 8 inches deep. How many cubic feet of concrete will be needed to construct the patio?
Penny Nom lui répond.
Related rates and an oil spill 2006-02-12
Brandon pose la question :

An Oil Tanker Spills 100,000 cubic meters of oil, which forms a slick that spreads on the water surface in a shape best modeled by a circular disc is increasing at a rate of 3m/min (it doesn't state what is increasing at 3m/min, so I'm assuming Radius until I can ask my teacher.) At t=T, the area of the "circular" slick reaches 100pi Sq. meters.

A) how fast is the area of the slick increasing at t=T
B)How fast is the thickness of the slick decreasing at t=T
C)Find the rate of change of the area of the slick with respect to the thickness at t=T.


Penny Nom lui répond.
the size of a lot is 300 sqm, what is the square feet conversion? 2006-02-11
JC pose la question :
the size of a lot is 300 sqm, what is the square feet conversion?
Penny Nom lui répond.
X^2 + 4X + 6 is a factor of X^4 + rX^2 + s 2006-02-11
Katie pose la question :
If X2 + 4X + 6 is a factor of X4 + rX2 + s, then find the value of r+s?
Steve La Rocque and Penny Nom lui répond.
A lampshade shape 2006-02-11
Rose pose la question :
Is there a solid shaped like a lampshade? Or do you just call it the bottom portion of a cone?
Penny Nom lui répond.
Is there a solid shape with 5 faces, 8 edges, and 4 vertices? 2006-02-11
Annie pose la question :
Is there a solid shape with 5 faces, 8 edges, and 4 vertices?
Penny Nom lui répond.
Working with percentages 2006-02-10
Mark pose la question :

Hi, i have problem...i am trying to average a group of numbers....when i try to average the average...its gives a different results:

A b c d = A/(b-c)
1169 1173 1 100%
534 540 0 99%
358 359 0 100%
172 174 0 99%
. . . .
. . . .
. . . .
2375 3422 24 70%
1976 3677 42 54%
1431 3660 53 40%
187 3433 57 6%
761 3142 39 25%
2080 2109 7 99%
38280 49121 266 78.35%

When I try to average column D - it yields to 86.73% and not 78.35?

Please help me


Penny Nom lui répond.
 
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