1. Lesson 28.notebook October 29, 2012
Assignment:
1­­>Set 29 (odds) ­ Due Wednesday (10/31)
2­­>Test signed??
1

2. Lesson 28.notebook October 29, 2012
Lesson 28 Warm­Up:
1) Solve by inspection: 70 = 2r + 10
2) Find 1/2bh, when b = 3 and h = 6.
3) Find b2 ­ (4ac), when a = 1, b = 4 and c = 4.
3
4) Simplify: 1000
5) Find the perimeter and area of this triangle: 12 in.
5 in.
2

3. Lesson 28.notebook October 29, 2012
Lesson 28
*scientific notation – method of writing a number as a
decimal number times a power of 10
*coefficient – the decimal number in scientific
notation that must be written with one non­zero digit
3

4. Lesson 28.notebook October 29, 2012
Examples ­ Lesson 28
Write each number in standard form.
A) 2.0 x 10 5
B) 7.5 x 10 8
C) 1.609 x 10 3
D) 3.05 x 104
4

5. Lesson 28.notebook October 29, 2012
Write each number in scientific notation.
E) 365,000
F) 295,000,000
G) 70,500
H) 25 million
5