A P6 Challenging question !

John had 993 tables n chairs at first. After he sold 2/5 of the tables n 5/8 of the chairs, he had 459 tables n chairs left. How many tables did he sell?

New Tax

Calculate A person earning 25550 :) Aldwin Income 25550 How much Aldwin Pays

Secondary 3 A Maths Logarim

Secondary 3 A Maths

Chapter 2.  Logarim

1)Changing indices to log

a^x= b

x  = log_ab

Example

10³=1000

3=log₁₀1000

3^x=2

x=log₃ 2

Do IT

Q1)3^x=4

Q2)2^y=2

2)Changing log to indices

log_ab = y

b       =  a^y

example

log₃ x = 2

x        = 3²

x        = 9

Q1) log₄y = 3

Q2) log₂x =2

3) Changing Of Base

	Log b
Logab =	-------
	Log a

	Log 5
Log45 =	-------
	Log 4

Q1) find log₆7

Q2) find log₈9

 <Logarithm/> tags

4) Power law of log

alog b = log b^a

2log 3 = log 3²

Take note

(Log b)²  = (log b)(logb)

                not equal to log b² 

5) Addition law of log

Log (ab) = Log a + logb

Log (12) = Log 3 + log4

Log (3x) = log 3 + logx

6) Subtraction law of log

log (a/b) = log a – log b

log (x/8)  = log x-  log 8

Qn1) Log(4x)

Qn2) log (7/x)

Secondary 3 A Maths Logarim

Secondary 3 A Maths

Chapter 2.  Logarim

1)Changing indices to log

a^x= b

x  = log_ab

Example

10³=1000

3=log₁₀1000

3^x=2

x=log₃ 2

Qns)

Q1)3^x=4

Q2)2^y=2

2)Changing log to indices

log_ab = y

b       =  a^y

example

log₃ x = 2

x        = 3²

x        = 9

Q1) log₄y = 3

Q2) log₂x =2

3) Changing Of Base

	Log b
Logab =	-------
	Log a

	Log 5
Log45 =	-------
	Log 4

Q1) find log₆7

Q2) find log₈9

 <Logarithm/> tags

4) Power law of log

alog b = log b^a

2log 3 = log 3²

Take note

(Log b)²  = (log b)(logb)

                not equal to log b² 

5) Addition law of log

Log (ab) = Log a + logb

Log (12) = Log 3 + log4

Log (3x) = log 3 + logx

6) Subtraction law of log

log (a/b) = log a – log b

log (x/8)  = log x-  log 8

Qn1) Log(4x)

Qn2) log (7/x)

A Maths points to take note on Surds

Facebook message with a high performance student

 

This is how a great student interact on face book with  a tutor :)

Difference between sulfur,sulphide,sulphite and sulfate

 

 

8:39pm

Hey

8:41pm

ya?

???

8:42pm

Started matrix ?

U took geo or history ?

8:43pm

no leh my teacher super slow sia just finish all the laws of indices today

8:43pm

Haha

8:43pm

combined humans=SS + History

let me test u a chem qn :D

8:44pm

whats the name of ion SO3

8:45pm

Sulphide ions

8:45pm

no la the name

dont check the internet arh

8:58pm

Dunno

No meh ?

8:59pm

ion of SO3 is sulfite

If SO3 is a compound its sulfur trioxide

8:59pm

I dunno how to spell ..... S2- then sulphide

Shit

Haha

9:00pm

I knew u would get wrong

:D

9:00pm

My spelling not so good

Lousy in English

Think must wack jarrette English soon

Haha

9:01pm

So weird sia must have sulfur,sulphide,sulphite and sulfate

agreed :)

9:02pm

Ya I also mixed up some times

 

<chemistry topics>

Quadratic expansion

(a + b) 2 = a 2 + b2 + 2ab 
(a - b) 2 = a 2 + b2 -2ab
(a+b)(a-b) = a2 - b2

Example 
(3a-4)(3a+4) 
=32a2 -42
=9a2 - 16