Answer:
The answer would be C. or D.
Step-by-step explanation:

<h3>Given:</h3>
▪ 
First, rewrite the numerator in such a way that the coefficient 2.1 becomes 21:

Divide the coefficient:

Divide the base by subtracting the exponents of the base 10.

Hence, the quotient of the given expression has a coefficient of 3 and the exponent of the base 10 is -4.



Answer:
2.
Step-by-step explanation:
I have the same thing as u. it's 2.
Answer:
Mika's estimated the sum to be 216. The actual sum is 216.27
Step-by-step explanation:
Mika:
189.27 = 189
15.8 = 16
11.2 = 11
189 + 16 + 11 = 216
Actual:
189.27 + 15.8 + 11.2 = 216.27
The answer would be b. 3/5 because if heads takes up 2 out of 5, the three left have to be tails.