Which is the best estimate of open paren negative 3 fifths close paren times open paren 17 and 5 sixths close paren ?

Estimate −3/5 as −0.6 and 17 5/6 as about 18. Then (−0.6)(18) = −10.8, which is closer to −9 than to −18. So the best estimate is negative 9.

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