Transcript Day Problems • Simplify each expression. 1. -(2.57)0 2. 5-2 3. 3ab0 5. x-5y-5 4. 5x-4

Day Problems
• Simplify each expression.
1. -(2.57)0
2. 5-2
3. 3ab0
5. x-5y-5
4. 5x-4
8.2 Scientific Notation
• Scientific Notation – a number is written as
the product of two factors in the form
a x 10n, where n is an integer and 1 ≤ a < 10.
• Examples:
3.4 x 106
5.43 x 1013
2.1 x 10-10
Recognizing Scientific Notation
• Is each number written in scientific notation? If
not, explain.
a. 56.29 x 1012
No; 56.29 is greater than 10.
b. 0.84 x 10-3
No; 0.84 is less than 1.
c. 6.11 x 105
Yes
Writing a Number in Scientific Notation
• Write each number in scientific notation.
a. 56,900,000
56,900,000
= 5.69 x 107
b. 0.00985
0.00985
= 9.85 x 10-3
Writing a Number in Standard Notation
• Write each number in standard notation.
a. 1.55 x 106
move the decimal 6 places to the right
1.55 x 106 = 1,550,000
b. 2 x 10-11
move the decimal 11 places to the left.
2 x 10-11 = .00000000002
Multiplying a Number in Scientific Notation
•
Simplify. Write each answer using scientific notation.
a. 7(4 x 105)
= (7 • 4) x 105
= 28 x 105
= 2.8 x 106
b. 0.5(1.2 x 10-3)
= (0.5 • 1.2) x 10-3
= 0.6 x 10-3
= 6 x 10-4
More Practice!!!!
• Textbook – p. 402 – 403 #2 – 22 even, 28
– 33 all.
• Homework – Workbook p. 389 #2 – 36
even.