What valid host range is the IP address $172\mathrm{.}26\mathrm{.}119\mathrm{.}35/25$ a part of$?$

What is the first valid host on the subnetwork that the node $192\mathrm{.}168\mathrm{.}67\mathrm{.}204/29$ belongs to$?$

You are designing a subnet mask for the $192\mathrm{.}168\mathrm{.}225\mathrm{.}0$ network. You want $29$ subnets with up to $4$ hosts on each subnet. What subnet mask should you use?

What is the broadcast address of the network $172\mathrm{.}23\mathrm{.}78\mathrm{.}0/25?$