On a trip from the united states to canada, isabella took d u. s. dollars. at the border she exchanged them all, receiving 10 canadian dollars for every 7 u. s. dollars. after spending 60 canadian dollars, she had d canadian dollars left. what is the sum of the digits of d?

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.