# math

posted by
**stacy**
.

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.¨C3(10x ¨C 3) + 10(3x ¨C 3) = x ¨C 7

3.Solve and graph the solution set.