Answer:
1. 130.1 mm
2. I don't know how to do it the other way
Step-by-step explanation:
P= 0.004y^2 - 0.03y + 122
= 0.004 (49)^2 - 0.03 (49) + 122
= 9.604 - 1.47 + 122
= 130.134
= 130.1 mm
