Homework Help: math

Posted by stacy on Friday, February 2, 2007 at 12:45pm.

1.A principal of $5000 was invested in a savings account for 4 years. If the interest earned for the period was $400, what was the interest rate?

2.每3(10x 每 3) + 10(3x 每 3) = x 每 7

3.Solve and graph the solution set.

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