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OpenStudy (anonymous):
Given the expression: 1990 x 1991 - 1989 x 1990. What counting number is equivalent to the expression?
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OpenStudy (blockcolder):
Do you know distributive property of multiplication? That solves this problem quite fast.
OpenStudy (anonymous):
yeah
OpenStudy (anonymous):
dont you need parentheses for that though?
OpenStudy (blockcolder):
So you know that your given expression is equivalent to \[1990 \times(1991-1989)\] correct?
OpenStudy (anonymous):
yeah
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OpenStudy (blockcolder):
So 1991-1989=2, so that your original expression is the same as 1990x2=2980.
OpenStudy (anonymous):
Oh ok. Thanks
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