The fastest way is to just use a scientific calculator.
To do it without a calculator, use prime factorization.
I'll only do the second one which is the answer.
27 x 8
= 3^3 x 2^3 = 6^3
Which is a perfect cube.
Hmmmm I’ll have to calculate this
30 minutes
Because it would take her an hour to go 8 miles and she is only going 4 so it is half an hour
1. Note that

2. Then the equation
can be rewritten

3. Solve it:

Answer: x=6
Uhh I think something like y=x+5