c is the correct answer of this question
Step-by-step explanation:
1/20-1/4 ×<1/5-2/5×
<h3>collection of like terms</h3>
1/20+1/5 <-2/5×-1/4×
<h3>= 1/4 <-13/20×</h3>
The power of two is any number squared.
Example~ 3*3, 5*5, 8*8
Answer:

Step-by-step explanation:
Given

Recursive: 
Required
Determine the formula
Substitute 2 for n to determine 


Substitute 


Next is to determine the common difference, d;



The nth term of an arithmetic sequence is calculated as

Substitute
and 


Hence, the nth term of the sequence can be calculated using