Step-by-step explanation:
a1 = 27
r = -9/27 = -⅓
the formula :
an = a1. r^(n-1)
= 27. (-⅓)^(n-1)
= 3³(-3`¹)^(n-1)
= 3³(-3)^(1-n)
The answer is A to change an exponent from negative to positive, just move it into either the numerator or denominator depending on where it is to begin with.
Since 470/6 = 78.333 it would take you 78.333 days to work 470 hours.
13, because 78 postcards divided by 6 cards per board = 13 poster boards
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