nabilarizwan0987 nabilarizwan0987 27-10-2022 Mathematics Answered For each calculation choose the correct answer written in standard form. a) (7 × 10⁵ ) × (3× 10²) A 21 × 10¹⁰ B 21 ×10⁷ C 2.1 × 10¹¹ D 2.1 × 10⁸ b) ( 2 × 10⁵) ÷ ( 4 × 10² ) A 2 × 10 ³ B 5 × 10² C 0.5 × 10³ D 2 × 10²