Invisible braces cost $500 more than metal braces. Metal braces cost $4,800. How much do invisible braces cost?
2 answers:
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9514 1404 393
Answer:
see attached
Step-by-step explanation:
The filling in of the formula for the n-th term is pretty straightforward. The attachment shows how simple it is.
The 7th term is found by evaluating the expression for n=7.
a₇ = 192
