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Write a rule for the sequence |
2013-02-20 |
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From Angelia:
Write a rule for the sequence. Then, find the unknown term. 1 3/8, 1 ¾, 2 1/8, _______, 2 7/8 Think: The pattern is increasing. Add 1/6 to find the next term. Rule: _______________
Answered by Penny Nom. |
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How can I teach how to change bases? |
2013-02-20 |
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From Tammy:
How can I teach how to change bases? For example 80 base 10 changed to base 3.
Thank you!
Answered by Harley Weston. |
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Solve 8 logx > x |
2013-02-19 |
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From Fulvio:
Hi, could you solve this equation in algebraic form:
8logx>x
Answered by Harley Weston. |
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A trig word problem |
2013-02-18 |
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From Amy:
Susan notices an unusual rock formation at an angle of 30 degrees to the right of her direction of travel as she is white water rafting. as she continues in a relatively straight path for 20 m, the rock formation appears to be at 45 degrees to the right. she cotninues until the rock formation is directly to her right. how far is she fromt he rock formation?
Answered by Penny Nom. |
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Extraneous solutions |
2013-02-18 |
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From Eileen:
(5x+4)^1/2-3x=0
Answered by Penny Nom. |
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Related rates |
2013-02-17 |
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From Ishaak:
A hemispherical bowl is filled with water at a uniform rate. When the height of water is h cm the volume is π(rh^2-1/3 h^3 )cm^3, where r s the radius. Find the rate at which the water level is rising when it is half way to the top, given that r = 6 and the bowl fills in 1 minute.
Answered by Penny Nom. |
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The continuity of f(x,y)=ln(x^2+y^2) |
2013-02-17 |
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From anu:
the question says we have to find the points in the plane where the function is continuous:
f(x,y)=ln(x^2+y^2) . here we aren't given a particular point (x,y) where we have to check a function's
continuity.
what is to be done if we have to check continuity over the whole domain of the function?
please help .
Answered by Harley Weston. |
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Swimming upstream and downstream |
2013-02-15 |
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From Kimberly:
a beaver swims down to its lodge 4 times faster than it swims upstream. how many times faster is its speed in still water than the speed of the stream?
Answered by Penny Nom. |
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Chocolate bars and puzzles |
2013-02-15 |
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From sandy:
Alan bought a box of puzzle and two bar of chocolate for $28.
Jan bought 3 boxes of puzzle and a bar of chocolate similar to
Alan for $69.
a) Find the cost of a box of puzzle
b) Find the cost of a bar of chocolate
Answered by Penny Nom. |
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An electron in a TV tube |
2013-02-15 |
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From anu:
an electron in a TV tube is beamed horizontally at a speed of (50^6) m/sec. towards the face of a tube 40 cm away
about how far will the electron drop before it hits? no information has been provided of initial height from where it is beamed.
Answered by Robert Dawson. |
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A word problem involving toys |
2013-02-14 |
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From sandy:
Each boy gets 5 toys.Each girl gets 3 toys.There are 150 pupils.
The boys had 74 more toys than girls.
How many boys?
How many girls?
Answered by Penny Nom. |
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A curve in 3-space |
2013-02-14 |
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From pardeep:
we have to show that the curve r(t)=(cos t)i+(sin t)j+(1-cos t)k ,0<=t<=2pie;
is an ellipse by showing it to an intersection of a right circular cylinder and a plane.
i got the eqn. of the cylinder but did not get the eqn of plane.
Answered by Harley Weston. |
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Dropping supplies from an airplane |
2013-02-14 |
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From Claire:
An airplane flying at an altitude of 3500 feet is dropping supplies to researchers on an island. The path of the plane is parallel to the ground at the time the supplies are released and the plane is traveling at a speed of 300 mph.
a) write the parametric equations that represent the path of the supplies
c)How long will it take for the supplies to reach the ground?
d) how far will the supplies travel horizontally before they land?
Answered by Penny Nom. |
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Is a line lying in a plane an open or a closed region? |
2013-02-13 |
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From pardeep:
please help with this question on the open and closed intervals ::
Is a line lying in a plane an open or a closed region? my teacher says it is a closed region reasoning out that it contains all it boundary points. please help how is it so?
Answered by Harley Weston. |
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The height of an aerial |
2013-02-12 |
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From ASIT:
A vertical aerial stands on a horizontal ground. A surveyor positioned due east of the aerial measures the elevation of the Top as 48 degree. He moves due south 30metre and measure the elevation as 44 degree. determine the height of the aerial
Answered by Penny Nom. |
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