20mi
H^2 = 12^2 + 16^2
H^2 = 144 + 256
H^2 = 400
H = square root of 400 = 20
21.78, take and multiply 2.79 by 5 ( there are 5 week days), and add the 7.83 once because it is the price for the two coffees. So weekly he spends roughly 21.78 on coffees
Not an inequality but d-m=5v. (d-m)/5=v. Basically just isolate the variable
-7+15. this is what i think it is.
