Exercise 30 Page 249

To evaluate the given expression for r=12, first, we should substitute 12 for r in the given expression.

When dividing real numbers, the quotient will be positive if the signs are the same and it will be negative if the signs are different.

cc Same Sign & Different Signs (+)÷(+)=(+) & (+)÷(-)=(-) (-)÷(-)=(+) & (-)÷(+)=(-) In our case one number is positive and one number is negative, so the quotient will be negative.

-12÷ 12

CalcQuot

Calculate quotient

- 1

We can verify this using a calculator.

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