Put 16 where n is, then do the arithmetic.
... a(16) = -6 + 3(16 -1)
... a(16) = -6 + 45
... a(16) = 39
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The pattern is subtracting each number by 5
The volume of a rectangular prism can be given by the form

you know Volume, base, and height but you dont know width
so divide b and h to both sides

and you cna solve for width
now for 6.
dividing by a number is the same as multiplying by its reciprocal