Heidi, a jewelry salesperson, earns a commission of $55 every time she sells a diamond ring. how many rings does she have to sell to earn $605? choose the equation that correctly calculates the amount. a. $55 + w = $605 b. $605 - $55 = w c. $55 x w = $605 d. $55 - w = $605 - w

C : $55 x w = $605

w = 11 , Heidi needs to sell 11 diamond rings to earn $605 .

Because she gets $55 every time she sells a ring, w the amounts of rings she sells should be multiplied.

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.