; ) PLEASE HELP!!
Which expression is equivalent to 18 1/5 - ( -22 2/5 ) - ( -40 1/5 )
A. 18 1/5 - 22 2/5 - 40 1/5

B. 18 1/5 + ( -22 2/5 ) + ( -40 1/5 )

C. -18 1/5 - 22 2/5 + 40 1/5

D. 18 1/5 + 22 2/5 + 40 1/5

D. 18 1/5 + 22 2/5 + 40 1/5

Step-by-step explanation:

Double negative makes a positive, so the -(-x), where x is a positive number, is +x. That makes the answer D

Dividing outputs by inputs

Step-by-step explanation:

If the output is greater than input, the net productivity is more than one ( more productive).

If the output is lesser than the input, it would mean less productive and hence ratio would be less than one.