The equation for the total number of paintings she sold to earn $1390.72 is:
[tex]1390.72 = 328(1 + 0.06)x[/tex], option A.
-----------------
[tex]E(x) = 328(1 + 0.06)x[/tex]
[tex]1390.72 = 328(1 + 0.06)x[/tex]
Which is given by option A.
A similar problem is given at https://brainly.com/question/23365994