Answer:
I thinks its +90
Step-by-step explanation:
For this case we must rewrite the following expression:

We have that by definition of multiplication of powers of the same base, we place the same base and add the exponents, example:

So:

Thus, the expression is rewritten as
, using exponents.
Answer:

Step-by-step explanation:
5.21× 3.4 = 17.714
thank u