Answer:

Step-by-step explanation:
The scientific notation:

We have:

21.8 >10
21.8 = 2.18 × 10
Thereofre:

Use


Step-by-step explanation:
5x 3 1/2 = 3 x 5 1/2 is false
the sign would probably be a negative. imagine this - - - - - - and then + + +, cancel out the negatives and plus then you are left with more negatives than positive so the sign will take the negative sign.
Answer:
208.8 inches is the answer