The reason for statement 4 is CPCTC.
$21 I believe (it's 1 am where I am so I'm not 100% sure but I think it's correct)
No. See, you can take 60 out of 156 twice and you are left with 36. This means the drive would take about 2 hours and 36 minuets. 7+2=9 30+36=66 so then you add an our the time and you get that she would arrive a few minuets afterwards. (I'm sorry if I didn't explain this very well)
You have 5 apples, together they cost 45 dollars, how much does each apple cost.
5x/5
45/5
x=9
In division, exponents with the same base are subtracted.
example:
