Do you remember how exponents work? Write down the meaning of “three to the power seven”. What is the base? What is the exponent? Can you explain clearly what a power is?
In this section you will find many numerical examples; use your calculator to work through them to develop confidence in the methods.
1 DEFINITION
2
3 = 2 × 2 × 2 and a
4 = a × a × a × a and b × b × b = b
3
also
(a+b)
3 = (a+b) × (a+b) × (a+b) and
1.1 Write the following expressions in expanded form:
4
3 ; (p+2)
5 ; a
1 ; (0,5)
7 ; b
2 × b
3 ;
1.2 Write these expressions as powers:
7 × 7 × 7 × 7
y × y × y × y × y
–2 × –2 × –2
(x+y) × (x+y) × (x+y) × (x+y)
1.3 Answer without calculating: Is (–7)
6 the same as –7
6 ?
Now use your calculator to check whether they are the same.
Compare the following pairs, but first guess the answer before using your calculator to see how good your estimate was.
–5
2 and (–5)
2 –12
5 and (–12)
5 –1
3 and (–1)
3
By now you should have a good idea how brackets influence your calculations – write it down carefully to help you remember to use it when the problems become harder.
The definition is:
a
r = a × a × a × a × . . . (There must be r a’s, and r must be a natural number)
It is good time to start memorising the most useful powers:
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life