Test Answers

1
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

2
Zero and Negative Exponents
3
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.
• Ill explain why later.

4
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

5
Examples

• 1. 50
• 2. -30
• 3. (-6) 0
• 4. 3-2
• 5.

• 1. 1
• 2. -1
• 3. 1
• 4. 1/9
• 5. 9/4
• 6. 5

5 100
6
More Examples

• 5ac-5

• ¼
• 3/(7ab5c2d4)
• 6/(ac3)
• 5a/c5

7
Try these
1. A square foot is 32 square yards. Simplify
this expression. Simplify. 2. 26 3. (7)3
4. 60
1
5. 112
121
8
Try these
Evaluate each expression for the given value(s)
of the variables(s).
6.
x4 for x 10
Simplify the following. There should be no
negative exponents. 8. 9.