Answer:
Step-by-step explanation:
Given that A is a square matrix and A is idempotent

Consider I-A
i) 
It follows that I-A is also idempotent
ii) Consider the matrix 2A-I

So it follows that 2A-I matrix is its own inverse.
Answer:
1. 25
2. 5.7
3. 10.7
4. 204
5. 100.5
Step-by-step explanation:
calculator
Answer:
x= 72
Step-by-step explanation:
simplify 1.2 × 60 will equal 72 so therefore x will be 72
To find the volume of a cone use this formula:
V =
V≈167.55