A is 307.2
b is 6.4 min maybe just a little less
Next time, just use a calculator...it's 5. Hope I helped!!! Please 5 star and thank!
Answer:

Step-by-step explanation:
We want use the order of operations and the digits 2, 4, 6, and 8 to create an expression with a value 2.
The expression is:

The order of operations is PEDMAS
Deal with parenthesis first,

Next deal with exponent

No Division and Multiplication so skip to Addition.

Finally subtract to get:

it is the last one before the time