1. REVIEW QUESTIONS Evaluate 6 + y when y = 15
You deposit $150 at 4% for 1.5yrs. What’s the interest?
Find perimeter of a rectangle with side 3.9 and 9.4.
Driving at rate of 108km/hr how long will it take to go 270km?

3. Objective: Students must demonstrate a knowledge of powers, basically the parts and what a power does. They also have to show they can write a correct power problem. They must be able to apply that to area and volume problems.
1.2 Exponents and powers

4. Properties of powers Power: repeated multiplication of same number
Ex: 43 is 4 x 4 x 4
Exponential form is 43
Power has 2 parts:
Base: number being multiplied 23
Exponent: number of times multiplying

5. Express in words (T/sT)89
10n x3
101 42 xn

6. Express as exponential form (T/st)
Three to the fourth power
Seven squared
4 x 4 x 4 x 4 x 4
3 to the wth power
X cubed
2 x 2 x 2
A x a

7. Evaluate the power
Evaluate when x = 5, x3
Evaluate 64

8. Student Examples Evaluate y3 – 6 when y = 7 Evaluate x2 when x = 1.2

9. Grouping Symbols Grouping symbols: ( ) or { }
Do the inner symbol first.
Ex: {8 +(2 – 8)}
Evaluate (a + b)2 when a = 1 and b = 2
Evaluate (a2)+(b2)

10. Evaluate
Evaluate
2x3 when x = 4
Evaluate (2x)3 when x = 4

11. Powers in formulas Some formulas involve exponents!
Area
Volume
Area measured in square units: s2
In2, m2, ft2
Volume measured in cubed units: s3
In3, m3, ft3

12. Powers in formulas
Find area
Find volume 2 12

13. Student Examples
Find area
Find volume
5ft
5cm

14. Word problem
Jeff is going to cover the floor with 1 ft squares. If the floor is a by 10.5 room, how many squares will he need?

15. Word Problem
I have a cube safe. What is the volume of the safe if the interior’s sides are 2ft.?

16. Wrap up Questions/Comments
Hw: text pg , #’s: 1-3, even, 44,48,56,67