9-05 please try these problems:

1. The brightness of a light source appears to decrease as distance increases. If brightness decreases by 1/d^2, how does the brightness change if the distance is doubled?

2. Consider the expression 1/ x^x. If x is a fraction, predict what increasing the value of x does to the value of the expression. Explain your thinking. Test your prediction.

3. a) Evaluate 76^2. The square of 76 ends in 76.

b) What other two-digit number also ends in itself?

4. A box measures 2 m by 3 m by 4 m. What is the longest length of straight pole you could place in the box? Draw a diagram to help explain.

From: McGraw-Hill Ryerson, 2009

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