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15. Show that (3x - 1)(x + 5) is
equivalent to 3x2 + 14x - 5
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What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?