Science & Mathematics - 21 January 2007

sidewalk is buildt directly from A to C. How long is the new sidewalk?

300 ft.
390 ft.
Pythagorean Theorem
130 ft.
Calculus

2. a2 + b2 = c2 is the formula called?

2007-01-21 12:45:05 · 5 answers · asked by shariff B 1 in Mathematics

2007-01-21 12:44:41 · 5 answers · asked by Anonymous in Medicine

How do you differentiate: (sec2x)/(tan2x+1)

I realize it involves the quotient rule, but no matter which way I try to solve it, I never reach [2(sec2x)(tan2x-1)]/(1+ tan2x)^2

Thanks!

2007-01-21 12:44:38 · 2 answers · asked by Katie__K 1 in Mathematics

Please help me with this riemann sums! I asked
twice yesterday but still couldn't understand it.
Could someone just show me how to get the
answer step by step? It's been 2 days I can't stand
it no more...!!! I hate riemann sum so much!!!

Q: consider the definite integral (2x+1)dx with b=3
and a=1 (I did it in fundamental theorem and got
10...please show me how to get 10 by reimann
sum please I beg you)

2007-01-21 12:43:59 · 13 answers · asked by Anonymous in Mathematics

2007-01-21 12:43:46 · 2 answers · asked by Anonymous in Mathematics

I've been praticing a little necromancy with a good friend of mine. We used something called a pendulum where you dangle the stone over the letters, and the spirits will reply. We've met a spirit named Mikey and for some reason have been able to contact him frequently. After talking with him for a while, the pendulum began swinging crazyily at me. My friend was the one holding it at the time, so she asked Mikey why. He didn't respond. We thought it was a bit weird but later forgot about it. Later, I was headed home and asked Mikey how I could contact him later. I got nothing. Then my friend took the pendulum and looked at it, and then it pointed striaght towards the letters. When she put it over them, it spelled out the word, "Love."

2007-01-21 12:43:26 · 18 answers · asked by Swiper 1 in Paranormal Phenomena

2007-01-21 12:43:05 · 7 answers · asked by Chris T 1 in Biology

2007-01-21 12:43:03 · 8 answers · asked by thanh n 1 in Mathematics

in the modern power station `s intermediate pressure turbine and low pressure turbine , we are using a techinque called double flow . it divides the incoming steam into flows in opposite direction ,why we only use that in the intermediate and low pressure turbine , not in t eh high pressur e turbine ?

2007-01-21 12:42:04 · 3 answers · asked by Anonymous in Engineering

2007-01-21 12:41:23 · 5 answers · asked by Phillip V 1 in Mathematics

This is my equation-NaHCO3+HCl ----> NaCl +H2O+CO2
Sodium hydrogen carbonte -3.00 grams
Sodium chloride - 1.15 grams
1)how do u calculate the number of moles for these masses and find the % yield
2)what is the balanced equation of calcium carbonate and hydrochloric acid
please help me to do this .....really appreciate any help
THANK YOU !!!

2007-01-21 12:41:00 · 1 answers · asked by guddi_bhalodia 2 in Chemistry

8 feet
9 feet
11 feet
5 feet
10 feet

2. If the area of a rectangle is 40 square feet, one side is 8 feet, what is the other side?

2007-01-21 12:40:54 · 8 answers · asked by shariff B 1 in Mathematics

The legs of an isosceles right triangle have length 12. Find the lengths of the hypotenuse and the altitude to the hypotenuse.

2007-01-21 12:40:34 · 2 answers · asked by Kate! 3 in Mathematics

2007-01-21 12:39:50 · 8 answers · asked by Anonymous in Astronomy & Space

2007-01-21 12:37:27 · 4 answers · asked by redneckproud92 1 in Biology

2007-01-21 12:37:26 · 2 answers · asked by Anonymous in Astronomy & Space

2 1/12+ 7 5/6+2 1/5+4 10/11=
i cant seem to find the common denominator for this one!

2007-01-21 12:36:25 · 4 answers · asked by Anonymous in Mathematics

2007-01-21 12:35:15 · 3 answers · asked by redneckproud92 1 in Biology

whoever answers this is a freaking genious and all deserve best answer

2007-01-21 12:35:03 · 3 answers · asked by Anonymous in Mathematics

I got 66+67+68 but 66 and 68 are even numbers. Do you know the way to figure this out?

Thansk

2007-01-21 12:33:10 · 10 answers · asked by Anonymous in Mathematics

2007-01-21 12:32:48 · 2 answers · asked by Anonymous in Medicine

Does an outcrop contaning Jurrasic dinosaur fossils overlying Pennsylvanian coal deposits represent uninterrupted deposition? Explain.

2007-01-21 12:31:42 · 1 answers · asked by tommy k 1 in Earth Sciences & Geology

6%
7%
5%
6.54%
3%

2. What percent of 90.95 is the sales tax Sam paid?

2007-01-21 12:31:00 · 17 answers · asked by shariff B 1 in Mathematics

2007-01-21 12:30:30 · 12 answers · asked by Liezl jan D 1 in Medicine

Need help with this one

2007-01-21 12:30:10 · 2 answers · asked by Anonymous in Mathematics

At least, it is for me :(

Triangle ABC is isosceles with segment AC congruent to BC. A (2,5), B (-2,1), and C(4,y). Find y.


How do I do this? :( Can someone please explain?

2007-01-21 12:29:57 · 15 answers · asked by 2 days after my B day :) 2 in Mathematics

In a parallel RC circuit, does the current in the capacitive branch lead or lag the supply voltage?

2007-01-21 12:29:38 · 3 answers · asked by phvxoui 2 in Engineering

2007-01-21 12:29:06 · 11 answers · asked by Kari *** 1 in Engineering

Think of any fundamental operation(addition, subtraction, multiplication, division, exponentiation) on
A. Irrational number, which results in:
- a rational number
- an irrational number
B. A complex number( a+bi, where a and b are real and b is not equal to zero), which results in:
- a real number
-a complex number (a+bi, where a and b are real)

I need some examples with numbers, I am stuck on this. Please help.

2007-01-21 12:28:57 · 5 answers · asked by ruthnsnare 2 in Mathematics

how do archelogists learn about the past?

2007-01-21 12:28:33 · 17 answers · asked by Anonymous in Geography