Network Subnetting: How to set up a custom subnet for the picture shown

I was hoping for some help on checking my anwerrs for this question. I'm especially confused about h.) - k.) . Please dont copy and paste from the similar question asked before either as some of the answers are not correct/missing. Thanks!

1. Suppose we have Network address 135.126.0.0 and based on the information given in figure below, network administrator has been asked to design a network addressing scheme that will supply the minimum number of hosts per subnet, and allow enough extra subnets and hosts for 30% growth in all areas. (25 points) IP Address 135.126.0.0 SO FO/O S0/0/1 FO/O F0/1 Tech Ed Lab 20 Hosts F0/1 Science Lab 10 Host sh Department 15 Hosts a. What is address class of given network address? (1 point) b. What is default subnet mask? (1 point) C. What is custom Subnet mask? (1 point) d. Total Number of subnets needed (after 30% growth) (1 point) e. Total number of host address needed for the largest subnet (after 30% growth) (1 point) f. Number of bits borrowed from host part for Subnetting? (1 point) g. IP address range for Tech Ed (1 point) h. What are the assignable addresses for the Tech Ed subnet a) if classful addressing is used and b) if classless addressing is used? (1 point i. IP address range for English (1 point) j. IP address range for Science (1 point) k. IP address range for Router A to Router B Serial connection (1 point)