Answer:
the simplest form of the given expression is 
Step-by-step explanation:
Given;

The above expression can be simplified as follows;

Therefore, the simplest form of the given expression is 
There is not alot information to answer the question.
Fg = 15
2/5(25) = 10
25-10 = 15
Answer:
a) 325.72
Step-by-step explanation:
A=4pir^2
A=4x3,14x7.2x7.2
a=651.44
1/2a=1/2x651.44
=325.72
Answer:
The number of ways to form different groups of four subjects is 4845.
Step-by-step explanation:
In mathematics, the procedure to select k items from n distinct items, without replacement, is known as combinations.
The formula to compute the combinations of k items from n is given by the formula:

In this case, 4 subjects are randomly selected from a group of 20 subjects.
Compute the number of ways to form different groups of four subjects as follows:



Thus, the number of ways to form different groups of four subjects is 4845.