Given:
A number is

To find:
The scientific notation of the given number.
Solution:
Scientific notation of a number is the product of a number between 1 to 10 and 10 to the power some integer.
We have,

It can be written as



Therefore, the scientific notation of the given number is
.
A²-5a+6
to factorise you find the common numbers that add to make 5 and times to make 6
soo that means it is
(a-2) (a-3)
The answer is B) 1.9 you need to use Pythagoras where a^2+b^2=c^2, so at 9 o'clock it will make a right angle triangle so the square root of 1.5^2+1.2^2 is 1.92093... rounded it is 1.9
Perpendicular: -4
Parallel: 1/4