7n+12
if n is the number of students, then n=6 so plug 6 in for n
so 7(6)+12
7(6)=30+12=42
so the cost for 6 students would be $42
He would have to take approximately 96 steps. If you multiply 2.3×96 you'll get 220.80.
The answer would be 105, it's square root is approximately 10.2469 <span />
