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