Answer:
B
Step-by-step explanation:
The chances of the first student walking to school is 7/30.
Without replacement, there are 29 students left. Hence the chance of the second student walking to school is 6/29 of the original 7/30 chance.

Answer:
x=0 or x=4
Step-by-step explanation:
5x(x−4)=0
Answer:
please check the attached file for the answer
Step-by-step explanation:
the explanation is in the attached file
Answer:
the answer is 20
Step-by-step explanation:
180+180=360
80+70=150
180-150=20
It will take 4.75 days, or 4 and 3/4's of a day if that's what you're looking for