All Questions +0 238066 Questions

The speed at which electrons moves through a semiconductor relates to their mobility, U. The
temperature dependence T of U is complicated but for many semiconductors, U shows the following
relationship:
U = kT^3/2
where k represents a collection read more ..

Guest Jan 6, 2014

768

+10

Help! need someone explain something simple???

●●●

davidashworth7 Jan 6, 2014

1415

Sinusoids

Could someone explain sinusoids to me, I'm having trouble finding horizontal shifts and such just from looking at the equation. And I can't for the life of me figure out how to graph them. Thanks!

●●●●●●●●

Guest Jan 6, 2014

689

algebra 2

Evaluate each expression if a = -5, b = 6 and c = 2.8.
6 - |3c + 7|

what is a plot of land to metre?

Guest Jan 6, 2014

776

PLOT

Help me solve this puzzle:
3 men bought a bottle of wine for 30 dollars. They paid 10 dollars each. When they left, the shopkeeper realized that the bottle only costed 25 dollars. So he sent a dude with the remaining 5 dollars. He kept 2 dollars and have read more ..

Guest Jan 6, 2014

764

Math puzzle

Guest Jan 6, 2014

763

log

log of another base

Guest Jan 6, 2014

Jan 5, 2014

773

math

simplify 3(2x+1)-2(x-4)

How would I round this number 567272.32484893

Guest Jan 5, 2014

845

MATH

If sin (30) = 1⁄2 then the cosine of what angle will be 1⁄2?

Guest Jan 5, 2014

824

trig

in triangle ABC, angle A = angle B + 30 degrees and angle C = angle B +60 degrees. Find the measure of each angle.

Guest Jan 5, 2014

799

Geometry

3^x * x^2 - 3^x * x = 0
can someone help me out with this?

Guest Jan 5, 2014

614

Simple math

Im having problems plotting circles.

Guest Jan 5, 2014

715

Plotting A Circle

By using this equation 13.34 x +0.43 g/cm3 x 10km x 3.143 ( 0.5 +( tan-1( x/z)) /180
Show that the measured gravity anomaly of half slab b at x= -2 and x=2km
Are +80.9 and +99.3 mGal respectively
Please help!!!

Guest Jan 5, 2014

753

Geophysics

what is the result of 25x(40-n)=(25x40)-(25x32):n ?

Mb1778 Jan 5, 2014

775

answer me!

Here is a puzzle but it is also very useful, now or later, if you want to factorise a trinomial.
What are 2 numbers that multiply to give 8 and add to give 6? this is an easy puzzle most of you could do it with your eyes closed.
If people cooperate read more ..

Guest Jan 5, 2014

1634

+118735

Puzzles and stuff for the younger students - please join in.

●●●●●●●●●●●●●●●●

Melody Jan 5, 2014

756

Logic puzzle

You run a store. You sell 5 phone cases for $12.99 each a day with 7% tax
tax on each. You also sell 1 phone a day for $299.99 with 9% tax. Lastly 3
chargers for $4.99 each with 5% tax. Your daily expense is $450.67. What
should be increased read more ..

Besides maths, I am also interested in natural things.
The last few days i have been really treated.
There was a bird making an almight ruckus in the gum tree at the front of my surburban house (in Sydney, Australia).
The bird was easy to find. read more ..

Guest Jan 5, 2014

1184

+118735

Amazing birdlife. (but no maths)

Use only the numbers 8163 to make a decimal and fraction closest to one. No repeats

Melody Jan 5, 2014

735

Puzzle

●●●●

Guest Jan 5, 2014

875

Math

0.41 un terminating to a fraction

Take the month you were born in. Multiply it by 4, add 13, multiply by 25, subtract 200, add the day you were born, multiply by 2, subtract 40, multiply by 50, add the last two digits of your birth year, subtract 10500…. viola! Your birth date. Have fun and read more ..

Guest Jan 5, 2014

Jan 4, 2014

973

Take the month you were born in. Multiply it by 4, add 13, multiply by 25, subtract 200, add the day you were born, multiply by 2, subtract 40, multiply by

What is cost of tolls between 08054 and 34211?

Guest Jan 4, 2014

782

Tolls

2*(1+2*y)^(2/3)=(1*y)^(5/3)*.02^(.5)

Guest Jan 4, 2014

738

solve equation

●●●●

Guest Jan 4, 2014

1395

Vector algebra of tetrahedron

The vertex length of a tetrahedral geometry from the centre is 'a'. By constructing vecotrs show that resultant of any three vectors is equal and opposite to the fourth vector.

three cards are drawn from an ordinary deck of 52 cards. Each card is replaced in the deck before the next card is drawn. What is the probability that at least one of the cards will be a spade

mathy Jan 4, 2014

756

probablity