1. (negative 8 and 3 / 7) + (- 7.5) + (negative 21 and 4 / 7) + (+ 3 and 1 / 2)=

(negative 8 and 3 / 7) + (- 7.5) + (negative 21 and 4 / 7) + (+ 3 and 1 / 2)
=(- 59 / 7) + (- 15 / 2) + (- 151 / 7) + (7 / 2)
=59 / 7 △ 15 / 2-151 / 7 + 7 / 2
=118 / 105-2265 / 105 + 7 / 2
=-2147 out of 105 + 7 out of 2
=-4294 out of 210 + 735 out of 210
=-3559 out of 210
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