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What number should be added to both sides of the equation to complete this square? x^2-10x=7

According to the data set, where should the upper quartile line of the box plot be placed?

William invested $5000 in an account that earns 3.8% interest, compounded annually. the formula for compound interest is a(t) = p(1 + i)t. how much did william have in the account after 6 years? (apex)