Answer:
7 x (-9)
Step-by-step explanation:
7 x (-9) = -63
-3 x (-5) = 15
-2 x (-1) = 2
6 x 6 = 36
Can you multiply it all out? Yes. Did you need to? No. That was just to prove that the first choice is correct.
All you have to know to answer this is that:
positive * positive = positive; + * + = +
negative * negative = negative; - * - = +
positive * negative (or negative * positive; remember that the order of the numbers you're multiplying does not matter) = negative; + * - = - or - * + = -
Or if you learn better in words:
If two factors have the same sign, the answer is positive.
If two factors have different signs, like if one is positive and the other is negative, then the answer is negative.
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