A possible answer is

.
Pi is an irrational number and when you multiply a rational number with an irrational number, you end up with an irrational number.
Answer:
168745
Step-by-step explanation:
times them all together.
Answer:
$51.2
Step-by-step explanation:
3 + 4 + 1 = 8
8 x 6.40 + 51.2