99 plus 9 tens?? if so, 189
Answer:6
Step-by-step explanation:
If you subtract 10-4 you get 6
Answer:

Step-by-step explanation:
According to the Product Rule for Exponents, 
a = 7
m = 9
n = 4
So,

So, the answer is
.
Hope this helps!!!
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A)= 2/20 or 1/10
B)=16/20 or 4/5
C)=1/5