Answer:
the correct answer is B. 5 miles per hour
Step-by-step explanation:
if she walks 5 miles in a hour she can walk 2.5 miles in 30 minutes
(a+c)+7
this is called the Associative Property
(x+y)+z=x+(y+z)
If the expression is 'seven less than n', we are subtracting 'seven' from 'n'.