A manufacturer knows that their items have a normally distributed length, with a mean of 18.7 inches, and standard deviation of 0.6 inches. If 17 items are chosen at random, what is the probability that their mean length is less than 18.4 inches

Follow these steps using the algebra tiles to solve the equation −5x + (−2) = −2x + 4. 1. add 5 positive x-tiles to both sides and create zero pairs. 2. add 4 negative unit tiles to both sides and create zero pairs. 3. divide the unit tiles evenly among the x-tiles. x =

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If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).