Explain how the position of the decimal point changes in a quote as you divide by increasing powers of 10

Which expression is equivalent to (9x - 3 1/ + 1 3/8)

Tracy solved the following problem. which of the statements is true? 9 ÷ 3 + 6 × 2 3 + 6 × 2 9 × 2 18 her answer is correct. her answer is incorrect. she should have multiplied before dividing. her answer is incorrect. she should have multiplied before adding. her answer is incorrect. she should have added before dividing.

The vet charges $45 for an office visit and $10 for each vaccination your dog needs. write an eaquation