When Bill bought a marigold plan it was 1/4 inches tall after the first week is was 1 1/12 after the second one it was 1 11/12 inches after week three it was 2 3/4 inches what was the night of the plant at week 4? What if Bill's plant grew at the same rate but was 1 1/2 inches when he bought it? How tall would the plant be after 3 weeks?