Math History

3240

Most of them, actually. Hero of Alexandria developed a steam-powered rotary engine, built a vacuum pump and wrote volumes on engineering, physics and hydraulics. Archimedes developed the principle of displacement, and wrote of a giant mirror that might be used to set wooden ships on fire by focusing sunlight onto the ship.

Because by 'adding' a negative number to another negative number, you are making the first number even smaller - or more negative

A negative number means to take away. Think about in terms of money. If I owe you five dollars, then I have negative five dollars (-5). If I borrow ten more, then I owe you additional (+) ten dollars (-10). You would then add them together to figure out how much is owed. Five dollars plus ten dollars is fifteen dollars (-5 + -10 = -15).

Or you can think about it this way: two negative numbers added are always negative for the same reasons as when you add positive numbers, their sum is always positive. You get further away from zero, just in opposite directions.</P>

p+n=x

No, it's not a binomial. (x + 5) is an example of a binomial. A binomial has more than one term. Just look at the word binomial and you will know why. Bi means two.2xy is a monomial. Mono means one.

64

It is a series of cubes

13, 23, 33, 43, 53 etc

The Seikan Tunnel is located beneath the Tsugaru Strait, a channel, in Japan. The precise coordinates are 41.3157 degrees N, 140.3351 degrees E.

Pi is a Greek letter and is used as a number in the form of a symbol. It can be used to find the area and circumference of a circle. If you mean how the number was found, you just measure the circumference of any circular object and divide that by its diameter (using very precise measurements).

No rectangle can have 6 sides. Rectangles by definition have 4 sides.

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A 6-sided rectangular solid, on the other hand, has... let's see, could it be six?

I think it refers to kilometers, there are 10 kilometers (6.2) miles to be run in a 10k race. or it refers to 10,000 (k=1,000)

A cube has 6 square faces.

#1="a" #2="b" #3="c" (a+b+c)/3=V if a=Z and b=Y, Z/3+Y/3+c/3=V Therefore: c/3=V/(Z/3+Y/3) c=3*V/(Z/3+Y/3)

I've encountered that on my GRE review. The given are: A. ZY - V

B. Z/V - 3 - Y

C. Z/3 - V - Y

D. 3V- Z - Y

E. V- Z - Y

if the 3rd missing letter is X, then maybe (I just guessed, so I'm not sure):

z/3+y/3+x/3=V

x/3=V -z/3 -y/3

3(x/3)=(V -z/3-y/3)3 cancel all corresponding 3's and times 3 to V

x= 3V-z-y

the answer is D.

Tony Gadis

Thirty of them.

.685 = 0 + (6/10) + (8/100) + (5/1000)

Trois (in French) or drie (in German).

0.0067

A rectangle is not a square

Cylindrical shape or Cylinder shape

Subtraction. They all want to be size zero.

A cuboid is a geometric solid figure that has six rectangular faces at right angles to each other. It has 12 edges and 8 vertices.

12... Just look at one.