SOLUTION: sigh...help me please. Multiply (10)(6)(-9)

Question 117898: sigh...help me please.
Multiply (10)(6)(-9)
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
1.
Multiplication of a number by a number yields a ; for example,
2.
Multiplication of a number by a number yields a ; for example,
3.
Multiplication of a number by a number yields a ; for example,
4.
Multiplication of a number by a number yields a ; for example,
Or, we can use only sign to write these rules:
1.(+)*(+)=(+)
2. (+)*(-)=(-)
3. (-)*(+)=(-)
4. (-)*(-)=(+)

Multiply
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