Suppose we want to choose 5 letters, without replacement, from 18 distinct letters

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

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Which statement is true about the local minimum of the graphed function? over the interval[-4,-2], the local minimum is 0. over the interval [-2,-1] , the local minimum is 25. over the interval [-1,4], the local minimum is 0. over the interval [4,7], the local minimum is -7