Hey guyss ik this question already been asked but the teacher said it wasn't enough explanation and i got a C on the test so PLSSS ANSWER AND EXPLAIN THOROUGHLY I NEED AN *A* TYSMMM ILY. Part A: The sun produces 3.9 ⋅ 10^33 ergs of radiant energy per second. How many ergs of radiant energy does the sun produce in 1.55 ⋅ 10^7 seconds? (5 points)

Part B: Which is the more reasonable measurement of the diameter of a human hair:
1.8 ⋅ 10^−2 mm or 1.8 ⋅ 10^2 mm? Justify your answer. (5 points)