Answer:
60
Step-by-step explanation:
distance=80*45/60
=80*0.75
=60km
Answer:
$750
Step-by-step explanation:
(-35-42-63)/7= (-140)/7=-20
Answer: 
Step-by-step explanation:
Given
Function is 
Zeroes of the function are

Using completing the square method

868 is about 870, and 28 is about 30, so your expression would be 870 divided by 30 which would be 29 and the actual answer is 31, so your estimate would be close to your actual answer.