Graziano predicted that he would sell 420 tablecloths. he actually sold 520 tablecloths. what are the values of a and b in the table below? round the answer to the nearest tenth. percent error item approximate value exact value error absolute error ratio percent error tablecloths 420 520 a b

Me find the measure to side c and the process to solve the problem you appreciate it : )

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.

Ibeg you to me 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?