(1) Subtract: \( \left(3.4 \times 10^{5}\right)-\left(2.1 \times 10^{4}\right) \)
(A) \( 3.19 \times 10^{3} \)
(B) \( 3.19 \times 10^{5} \)
(C) \( 1.3 \times 10^{1} \)
(D) \( 1.3 \times 10^{5} \)

Answer

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Answer

(3) Result: \( 3.19 \times 10^{5} \)

Steps

Step 1 ：(1) Convert both terms to same power of 10: \( 3.4 \times 10^{5} - 0.21 \times 10^{5} \)

Step 2 ：(2) Subtract the terms: \( (3.4 - 0.21) \times 10^{5} \)

Step 3 ：(3) Result: \( 3.19 \times 10^{5} \)