Final answer:
The simplified expressions are A: 14,740 as a product of 20 and 737, B: +x indicating a positive value of x, C: 15 as the product of 15 and 1, and D: -i which indicates the negative of the imaginary unit.
Step-by-step explanation:
The simplified expressions for each of the provided examples are as follows:
- A. (20 x 737): This expression can be simplified by multiplying 20 by 737. Without a calculator, you can break it down to 20 x 700 + 20 x 30 + 20 x 7 to get the answer, which is 14,740.
- B. (+x): This expression is already simplified, representing a positive value of x.
- C. (15 x 1): The product of 15 and 1 is 15. This is based on the multiplication principle that any number multiplied by 1 equals the number itself.
- D. (-i): In this case, i usually represents the imaginary unit in mathematics. The expression is already in its simplest form and just indicates the negative of the imaginary unit.
Remember, when simplifying expressions, one of the key steps is to perform any multiplications or divisions, following the rules of arithmetic and considering the properties of numbers (positive, negative, imaginary, etc.) as they apply.