Question

$what \: will \: be \: the \: sign \: of \: the \: product \: if \: we \: multiply \: 90negative \: integers \: and \: 9 \: positive \: integers$
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Answer 1

(-)^90 (+)^9

(+) × ( + ) if we multiply even Integer with negative value then the value will be positive and if we multiply odd integer with negative value then the value be negative.

Here,

90 is even integer and we multiply even integer with negative value so it is positive and if we multiply odd OR even integer with positive value then it will always positive.

==> '+'

here is your answer