Scientific Notation Review
Writing Numbers in Scientific Notation:
1.) 120,000
Moving decimal to left = positive exponent
2.) 0.0023
Moving decimal to the right = negative exponent
Scientific Notation Review
Writing from scientific notation to standard form:
1.) 2.3 x 104
Positive Exponent = move that many spaces to the right
2.) 4.5 x 10­3
Negative Exponent = move that many spaces to the left
1
Multiplying in Scientific Notation
(5 x 104)(2.5 x 103)
Multiply BIG #'s, ADD exponents
Dividing in Scientific Notation
6 x 108
2 x 103
Divide big #'s, SUBTRACT exponents
Graphing Exponential Functions
y = 3x
x y
2
Graphing Exponential Functions
y = 1 x
3
x y
Using the formula A = P(1 + r)t , a boat that costs 12,000 decreases in value by 5% per year. How much will it be worth in 3 years?
A = ?
P = r = t = A = 12000( 1 ­ .05)3
A = 12000(.95)3
A = 12000(.857375)
A = 10,288.50
3
Determine the amount for P, that must be invested in a savings account for college that is compounded annually at 2% in order to have 14,500 in 4 years.
A = P = r = 14,500 = P(1 + .02)4
14,500 = P(1.02)4
14,500 = P(1.0824321)
1.0824321 1.0824321
t = P = 13,395.76
4