An estimate always makes sense.
-- I have $10 in my pocket, this pump says $2.21 a gallon, and my car has been getting about 29 mpg. How many miles can I buy ?
-- I'm responsible for the reading two weeks from next Saturday. I'm about 1/3 of the way through learning 190 lines. How many lines must I average learning each day from now til then ?
-- I'm 32 miles from home and rush hour is srarting to build. My wife wants to know when I'll be there. What shall I tell her ?
Answer: (6,7)
Step-by-step explanation:

Why?
We have the isosceles right triangle. The length of legs are 6. Use the Pythagorean theorem:

In general, the formula for calculating the hypotenuse in an isosceles right triangle is 
a - a leg, h - a hypotenuse
Answer:
21.30
Step-by-step explanation:
85.20/4