It is given in the question that f is a one-to-one function.
And for a one-to - one function,
If

So we will get

Multiply 3 by both sides answer x=27/16 or in decimal 1.6875
In 4 hours they will be 400 miles apart 4 times 55 is 220 and 4 time 45 is 180 since there going in opposer directions add the miles together and it equals 400 so it takes 4 hours
Answer:
The answer is 125.6
Step-by-step explanation:
C= 2x3.14x20
C=6.28x 20
C= 125.6