- Why the focal length of magnified glass kept small?

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Find the sum of the first 25 terms of the arithmetic sequence. a-1=100
a-25=220? Write the equation y = (x − 4)(x + 2) in standard form.? What is the derivative of the sqrt of 2x? The book says the answer is the sqrt of 2/2•sqrt x. But I keep getting 1/sqrt(2x).? Calculate the pH of a solution that is 0.100 M in hydrofluoric acid and 0.100 M in sodium fluoride. Ka of hydrofluoric acid is 6.3 x 10-4? Can someone help me, I find this problem confusing?