for her vacation mrs. andrews bought $300 worth of traveler's checks in $10 and $20 denominations. if she has 22 travelers checks in all, how many of each denomination does she have?

let x represent the number of $10 traveler's checks she has. which expression represents the value of the $20 traveler's checks she has?

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.