Author Topic: Useless Subjects at School (Read 2625 times)

Colwyn · « **Reply #10 on:** March 09, 2012, 18:58:36 PM »

Quink? Luxury! We dreamed of having Quink. We had India Ink which came in gallon cans (5cl? What's a 5cl?). It clotted after two minutes of use and if you spilled it on your fingers, which you always did, it took 3 days of scrubbing with wirewool to start to take away the stain.

Scunner · « **Reply #11 on:** March 09, 2012, 19:03:22 PM »

Now I recall a different problem. Being left handed, this caused the hand to follow the pen, and with fountain pens this caused smudging the ink and giving me a blue hand from little finger tip to wrist. Nobody cared.

Diverbaz 1 · « **Reply #12 on:** March 10, 2012, 07:05:57 AM »

Algebra, still don't know what x is equal to!!!

anna-marie01 · « **Reply #13 on:** March 10, 2012, 07:17:32 AM »

Isn't Algebra between Morocco and Libya ?

tinkerman · « **Reply #14 on:** March 10, 2012, 07:19:07 AM »

pie r squared innit?

Stan · « **Reply #15 on:** March 10, 2012, 07:48:50 AM »

pie r round usually.
I can still remember "the formula" for solving quadratic equations, now that has been really usefull !!!

tinkerman · « **Reply #16 on:** March 10, 2012, 08:18:05 AM »

cosigns that was another one! I knew less about them than I did about logarithms

steveb1 · « **Reply #17 on:** March 10, 2012, 09:31:40 AM »

Logarithms just in case you need reminding

WHEN WE ARE GIVEN the base 2, for example, and exponent 3, then we can evaluate 23.

23 = 8.

Inversely, if we are given the base 2 and its power 8 --

2? = 8

-- then what is the exponent that will produce 8?

That exponent is called a logarithm. We call the exponent 3 the logarithm of 8 with base 2. We write

3 = log28.

We write the base 2 as a subscript.

3 is the exponent to which 2 must be raised to produce 8.

A logarithm is an exponent.

Since

104 = 10,000

then

log1010,000 = 4.

"The logarithm of 10,000 with base 10 is 4."

4 is the exponent to which 10 must be raised to produce 10,000.

"104 = 10,000" is called the exponential form.

"log1010,000 = 4" is called the logarithmic form.

Here is the definition:

logbx = n means bn = x.

hope you all got that

Stan · « **Reply #18 on:** March 10, 2012, 09:36:39 AM »

What about chemical elements and valency numbers, I think it was, totally baffled me. And could Steveb1 please write in English.

tinkerman · « **Reply #19 on:** March 10, 2012, 10:13:18 AM »

ah yes its all coming back to me now...WHOOSHHHHHHHHH

Author Topic: Useless Subjects at School (Read 2625 times)

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