Subnetting - General Questions

A /24 network must be divided into at least 30 equal subnets. What is the new prefix length?

What is the broadcast address of the subnet containing 95.159.139.107/23?

How many usable host addresses are there in a /23 subnet?

What is the broadcast address of the subnet containing 213.230.85.216/25?

What is the network address of the host 133.211.36.35/16?