Hello everybody, I am taking a basic undergrad General Chemistry I course and am just having a little trouble brushing myself up on dimensional analysis (or factor label). This is the problem. The area of a telescope lens is 7903 mm2. (a) What is the area in square feet? (b) If it takes a technician 45 sec to polish 135 mm2, how long does it take her to polish the entire lens? I am just not so sure how to get from millimeters squared to square feet. If anyone can help me out I'd really appreciate it. Thank you.