hello please help me to solve the following problems in Particle Technology subject. I have already answer on some numbers but I want to make sure that I got the correct one - solution and answer because I really doubt in my solution and final answer, I feel like I am wrong and not correct way/procedure. I have a little source of formula and etc and sometimes it seems like its too far from the real answer. so please help me to answer these all. Please? Please provide the correct solution and answer -show the formula if possible only so that I can learned how to solve those given problems. This is very important so I hope you can help me to this activity, please? Please help me please.. Thank you

1. In an analysis of a certain crushed material, the total surface area of a certain fraction of 5 kg sample that passed through a 7-mesh sieve but was caught on a 9-mesh sieve is 7.88 m2. If the density of the material is 1050 kg/m3 and the shape factor is 1.75, find the fraction. a) 42% b) 38% c) 52% d) 34% 2. A newly dried powdered material has an average analysis of 1.29 mm in size. If 300 kg of this material is produced, what is the total surface area assuming that the shape factor is 1.25 and density of the material is 1450 kg/m3? a) 1100 m2 b) 1000 m2 c) 1200 m2 d) 1150 m2