Network adress: 93.0.0.0/19
Adress class: A
Default subnet mask: 255.0.0.0
Custom subnet mask: 255.255.224.0
Total number of subnets_______?
Total # of host addresses ________?
Number of useable addresses________?
Number of bits borrowed______?

What is the 15th subnet range?
What is the subnet number for the 9th subnet?

This looks like some type of homework question. Why dont you give it a try first and then ask for some help if you get stuck on a concept.

Here is some information you can read over to learn about subnetting:
CIDR and Subnetting

Also, there are plenty of online subnet-calculators to help you check you work. Here is one that you can use:
IP Subnet Calculator

You cant learn if you dont try to do it for yourself.

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