The linear equation y=ax + b _____ as a straight line, a) draws, b) is drawn, c) has drawn, d) was drawing, The cubic function _____ by the term x3, a) was defined, b) is defining, c) is defined, d) has defined, These iterative methods ______ by mathematicians for many years., a) have been used, b) are using, c) were been using, d) use, The graph of  y=1/x ___ for values of x between −5 and +5 in the text., a) is constructed, b) constructs, c) has been constructed, d) will construct, Unfortunately, no simple formula ___ for solving cubic equations., a) has found, b) is found, c) was finding, d) have been found, The calculations ___ by a computer at the moment., a) are being done, b) are doing, c) have been done, d) been done, The mirror image of  y = x3 ___ already in the previous paragraph., a) has been shown, b) is showing, c) shows, d) was showing, Quadratic equations ___ by using the quadratic formula., a) solve usually, b) are usually solved, c) usually solved, d) have usually been solved, The discontinuity in the function ___ at x=0, a) is observed, b) observes, c) has observed, d) were observed, More advanced techniques ___ in the next unit., a) will be introduced, b) will introduce, c) are introducing, d) have introduced.

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