An expression containing certain physical quantities is (1273.43 – 51.7052 + 745)× 21.After evaluation the correct answer is

1. Break Down the Problem

To solve the expression $(1273.43 - 51.7052 + 745) \times 21$, we will first simplify the expression inside the parentheses and then multiply the result by 21.

2. Relevant Concepts

We need to follow the order of operations, often remembered by the acronym PEMDAS (Parentheses, Exponents, Multiplication, Division, Addition, Subtraction).

3. Analysis and Detail

1. Evaluate the expression inside the parentheses: $1273.43 - 51.7052 + 745$ First, we perform the subtraction: $1273.43 - 51.7052 = 1221.7248$ Next, we add 745: $1221.7248 + 745 = 1966.7248$

2. Now multiply the result by 21: $1966.7248 \times 21$ Performing the multiplication: $1966.7248 \times 21 = 41303.2648$

4. Verify and Summarize

We verified our calculations after each step, and all operations were performed correctly. The final result from the expression is $41303.2648$.

Final Answer

The correct answer is $41303.2648$.