Answer: she needs to babysit 4 more times.
Step-by-step explanation:
Answer: n*(3n+2)*(3n-1)
Step-by-step explanation:
A = L x W
L = W + 3
so equation
A = W (W + 3)
70 = W (W + 3)
or
W (W + 3) = 70
answer
D. last one
W (W + 3) = 70
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.