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PLEASE HEP URGENT

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

Kevin's bank offered him a 4.5% interest rate for his mortgage. if he purchases 3 points, what will be his new rate?

Complete the conditional statement. if a + 2 < b + 3, then a < b b < a a – b < 1 a < b + 1