Help again lol

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Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

Stephen thublin invests $1,000,000 in a 45-day certificate of deposit with 6.55% interest. what is the total interest income from the investment?

Sarah used her calculator to find sin 125 degrees. she wrote down sin sin125 degrees.57. how could sarah recognize that her answer is incorrect?