Answer: The correct option is
(A) [tex]1.29x=10.[/tex]
Step-by-step explanation: Given that Juan can download new songs for $1.29 each.
We are to write an equation to show how many songs he can download for $10.00.
Let x represents the number of songs that Juan can download for $10.00.
Then, according to the given information, the equation can be written as follows :
[tex]1.29\times x=10\\\\\Rightarrow 1.29x=10.[/tex]
Thus, the required equation is [tex]1.29x=10.[/tex]
Option (A) is CORRECT.