8 The number 0.00000072 in scientific notation is: A 7.2 × 10⁻⁷ B 72 × 10⁻⁸ C 7.2 × 10⁷ D 0.72 × 10⁻⁶
10 Convert 6.02 × 10²³ to standard notation. A 602000000000000000000000 B 60200000000000000000000 C 0.000000000000000000000602 D 6020000000000000000000
20 Which law states that logₐ(x/y) = logₐ(x) - logₐ(y)? A Product rule B Quotient rule C Power rule D Change of base rule