Test Answers 1.B 2.D 3.A 4.C 5.49 6.C 7.D 8.B 9.40 feet 10.10 boys 11.e $570 u $395 12.(0, 2) 13.(-4, 0) 14.y = 2x + 3 15.D 16. 17. 18. 19.C 20.D.

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Test Answers 1.B 2.D 3.A 4.C C 7.D 8.B 9.40 feet boys 11.e $570 u $ (0, 2) 13.(-4, 0) 14.y = 2x D C 20.D

Zero and Negative Exponents

Raising a Number to the Zero Power Anything raised to the zero power is 1, except 0 to the zero power. 0 to the zero power is undefined. I’ll explain why later.

Negative Exponents A negative exponent is telling you to find the reciprocal of that number, then raise it to the power indicated. For example, 5 -2 is telling you to flip 5 2 ( ), then square the 5( ). In the case of variables, you can just move it from top (numerator) to bottom (denominator) or vice versa. For example, would change to

Examples (-6) /9 5.9/

More Examples 5ac -5 ¼ 3/(7ab 5 c 2 d 4 ) 6/(ac 3 ) 5a/c 5

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Try these… Evaluate each expression for the given value(s) of the variables(s). 6. x –4 for x =10 7. for a = 6 and b = 3 Simplify the following. There should be no negative exponents