Please answer or i loose grades

28

Step-by-step explanation:

To complete the task in 30 days, they need at least 4 people working 7 hours.

( 4 x 7 = 28 hrs/day, 28 hrs/day to complete in 30 days, 28 x 30 = 840 hrs total to complete in 30 days. )

The company decides to have 5 people working 6 hours a day.

( 5 x 6 = 30 hrs/day, ? days to complete, must be 840 hours (30 day time span) to finish.   = 28. )

the probability is 0

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^