The area of a telescope lens is 6.439 × 103 mm2. (a) What is the area in square feet (ft2)? Enter your answer in scientific notation. (b) If it takes a technician 43.5 s to polish 1.53 × 102 mm2, how long does it take her to polish the entire lens?

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i