Answer:
Step-by-step explanation:
(3m-1)(6-a)-(m+3)(6-a)
=3m(6-a)-1(6-a)-m(6-a)+3(6-a)
=18m-3ma-6+a-6m+ma+18-3a
=12m-2ma+12-2a
=2(6m-ma+6-a)
Answer:
The answer to your question is 4
The sum of twice a number and 6 is 4.
the value of r of the geometric series n=11.3(0.8)n-1

General formula for nth term of any geometric series is 
Here 'r' is the common ratio
a_1 is the first term of the series
Now we compare the given formula with general formula
Compare
with 
The value of r= 0.8
x+7.9=8.5
solving x would be .6
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