Irina rakes leaves for $9.75 per hour. She works 10 times per month, and each job lasts 2.25 hours. Which equation would provide the best estimate of how many dollars Irina earns each month? 9 × 10 × 2 = 180 9 × 10 × 3 = 270 10 × 10 × 2 = 200 10 × 10 × 3 = 300

For this case the real step will be given by:
 (9.75) * (2.25) * (10) = $ 219,375
 Therefore, the best approximation is given by:
 (10) * (2) * (10) = $ 200
 The difference is:
 219,375 - 200 = $ 19,375
 Answer:
 the best estimate of how many dollars Irina earns each month is:
 10 × 10 × 2 = 200