- (X+1)^2=81?

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Why can't our cells use any of the other chalcogens besides oxygen as the last electron acceptor in cell respiration? How mineral composition affects weathering of rocks? If the Hubble telescope can see billions of light-years away, why can't it see exo planets just 40 light years away? A sector of a circle has a perimeter of 12 cm and an area of 8cm^2. Find all possible radii.? Math? A height of the a ball t seconds after it is thrown is modeled byt he function h=15t-4.9t^2 3, H is the height of the ball in meters?