68.25 mph because 273÷4=68.25 so the answer is 68.25 miles per hour
F - because you must move the decimal place 9 spaces to the left in order to have only a single digit in front of the decimal place. (There can never be more than one otherwise it is no longer scientific notation.
Answer:
-3/4x + 1/4
Step-by-step explanation:
