Andrew is buying some new shirts and sweaters. He is able to buy 3 shirts and 2 sweaters for $117 or he is able to buy 2 shirts and 5 sweaters for $210. How much does a shirt cost? How much does a sweater cost?
A shirt costs: S​

b i think

step-by-step explanation:

not really sure

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step-by-step explanation:

a_n = a_1 + (n - 1)d

the first term is 6.

the common difference d = ?

when you find d, replace n with 7 and d with the common difference to find your answer.

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