Final answer:
5² means 5 multiplied by itself, resulting in 25, and none of the options A, B, C, or D provided equals 25, therefore none of them are equivalent to 5².
Step-by-step explanation:
The expression 5² implies that the number 5 is being multiplied by itself once, as per the rule of exponents which states that an exponent is mathematical shorthand for repeated multiplication of the base by itself. Therefore, 5² is equivalent to 5 x 5, which equals 25. The correct equivalent expression that matches the value of 5² is not listed among the options A, B, C, or D provided, as none of those expressions equal 25. Thus, we can conclude that 5² is not equivalent to 5·(1/2), 10, 2/5, or 2·(1/5).