Final answer:
The number 10000 can be written in scientific notation as 1.0 x 10^4.
Step-by-step explanation:
The number 10000 can be written in scientific notation as 1.0 × 10⁴ (Option A). In scientific notation, we express a number as a product of two numbers: the digit term (1.0 in this case) and the exponential term (10⁴ in this case). The exponential term represents the power of 10 to which the digit term is multiplied. In this case, the digit term is 1.0 and the exponential term is 10 raised to the power of 4, which is equivalent to 10000.