So ummm... I think when you need to add zeroes is when your dividing and need your answer with no remainders, so you would add a decimal then add zeroes... I hope this is what you were looking for...?
Answer:
28.5 miles per gallon
Step-by-step explanation:
399 miles / 14 gallons
= 28.5 miles/1 gallon
1 gallon per 28.5 miles
Since the two angles have a sum of 90 degrees, we can add the two expressions together and set it equal to 90.
Answer:
Step-by-step explanation:
5/1 - 5/7
35/7 - 5/7
= 30/7 = 4 2/7 lb
Multiply the denominators, 7 by 5,and 1 by 7. When you have the same denominator in each fraction you can subtract. (7x4= 28, 30-28= 2)