Find the roots of this quadratic function using square roots. Glve the roots in the form x = {#, #}, with the lower number first. y= 2(x + 3)^2 - 162

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Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

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?

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?