 |
|
|
|
|
|
|
|
|
4 > -3m-7 >= 2 |
2010-06-05 |
|
From pamela:
The question is
4>-3m-7>=2
Answered by Penny Nom. |
|
|
|
|
|
|
11 trillion divided by 309,418,000 |
2010-06-05 |
|
From Dion:
I am struggling to calculate what 11 trillion divided by 309,418,000 is.
Answered by Penny Nom. |
|
|
|
|
|
|
(x + a)^2 |
2010-06-04 |
|
From a:
If the 3rd , 4th, 5th terms in the expansion of (x + a)powe "n" are 720, 1080, 810 respectively, then
find the values of x, a and n.
Answered by Penny Nom. |
|
|
|
|
|
|
Four circles in a square |
2010-06-04 |
|
From Daniela:
four circles are drawn in a square such that the circles are tangent to each other as shown. find the area of the shaded region. It the goes on to show a diagram with a square and four circles drawn in it. The length of a side of the square is 24. Please help me!
Answered by Penny Nom. |
|
|
|
|
|
|
The outside surface area of a U shaped tube |
2010-06-03 |
|
From Adolfo:
What is the formula for calculating the outside surface area of a U shaped tube?
Answered by Robert Dawson. |
|
|
|
|
|
|
The capilano suspension bridge |
2010-06-03 |
|
From nida:
the capilano suspension bridge in north vancouver is the world's highest footbridge of its kind. the bridge is 140m long . from the ends of the bridge the angles of depression of a point on the river under the bridge are 41 degrees and 48 degrees. how high is the bridge above the river to the nearest metre
Answered by Penny Nom. |
|
|
|
|
|
|
A quadratic equation with imaginary numbers |
2010-06-03 |
|
From Alissa:
I am solving a quadratic equation and I got this far;
(x-4+i)(x-4-i)=0
but how do I add the imaginary numbers
i know you multiply x by x and then add -4 + -4 but what do you do with the i's?
Answered by Penny Nom. |
|
|
|
|
|
|
Compound interest |
2010-06-01 |
|
From Kenneth:
Hello:
I have a question regarding the following compound interest and future value
calculation.
Year 1 P + rP equals balance after the first year.
Year 2 (P + rP) + r(P + rP) equals balance after the second year.
Year 3 ? equals balance after the third year.
This question is in two parts.
1. What would follow for year three?
2. I know that a pattern will develop. What will it be so that I can determine
the extended pattern for following years ?
Answered by Penny Nom. |
|
|
|
|
|
|
A cylindrical vessel with belled ends |
2010-06-01 |
|
From George:
surface area of a vessel with a cylindrical length of 60 feet, a diameter of 10 feet, and with belled ends of 5-foot radius
Answered by Penny Nom. |
|
|
|
|
|
|
Who is more extravagant? |
2010-06-01 |
|
From likhitha:
kunal and ramit have Rs.40 and Rs.50 respectively. Kunal spends
Rs.18 and ramit spends Rs.21.Who is more extravagant ?
Answered by Penny Nom. |
|
|
|
|
|
|
graph y=(2x^2-3x)e^ax |
2010-05-31 |
|
From James:
graph y=(2x^2-3x)e^ax
Answered by Robert Dawson. |
|
|
|
|
|
|
x/a +y /b =a+b : x/a^2+ y/b^2 =2 |
2010-05-30 |
|
From smithu:
x/a +y /b =a+b : x/a2+ y/b2 =2 solve by using elimination method ,
cross multiplication, substitution method
Answered by Penny Nom. |
|
|
|
|
|
|
Integration of sin^3 (2x) |
2010-05-29 |
|
From ascher:
how do you integrate this equation
∫ sin^3 (2x) dx
Answered by Robert Dawson and Penny Nom. |
|
|
|
|
|
|
Curvature of the Earth |
2010-05-29 |
|
From grant:
if you have 2 plumb structures 10ft. tall, how far apart will they be when they are 1 inch out of parallel at the top
Answered by Tyler Wood. |
|
|
|
|
|
|
A fuel tank with a broken gage |
2010-05-28 |
|
From Kinsley:
Hello, I have a fuel tank with a broken gage. It is a 2000 gallon tank. The dimensions are 64" dia. x 146" long. The fuel gage doesn't work, so the only measurement I can do is put a stick in it to see what is left. Currently it is at 19". PLEASE NOTE: the tank is laying on its side, meaning the long side is on the ground. So, how do I determine how much fuel is in the tank by the inches remaining? Thank you very much.
Answered by Tyler Wood. |
|
|
