\( 4.8 .3 \times 10 ^ { 5 } - 3.5 \times 10 ^ { 5 } \)

Let’s simplify the expression step by step! Start by rewriting the numbers in scientific notation to make the subtraction easier: \( 4.8 \times 10^{5} - 3.5 \times 10^{5} = (4.8 - 3.5) \times 10^{5} \) Now, perform the subtraction in the parentheses: \( 4.8 - 3.5 = 1.3 \) Now, bring it back to scientific notation: \( 1.3 \times 10^{5} \) So, the final answer is: \( 1.3 \times 10^{5} \)