Can you help me answer these questions using this image? I am lost on where to start. Thank you!

The link between RouterA and RouterB is a point$-$to$-$point connection, which can only used two IP

addresses. The network between RouterA and RouterB is $192\mathrm{.}168\mathrm{.}1\mathrm{.}0/30.$

A network administrator is using a class B network with subnet $172\mathrm{.}16\mathrm{.}0\mathrm{.}0.$ He needs $20$ subnets but will

only be using the $2$nd and $3$rd subnet. Your task is to do the following:

$1.$ Find the custom subnet Mask

$2.$ Find the subnet increment or multiplier

$3.$ Find the subnet ID$$s

$4.$ Find the Range of IP addresses

$5.$ Configure the routers with the appropriate IP addresses

$6.$ Configure the switches with the appropriate IP addresses and default gateway

$7.$ Configure the hosts $($PCs$)$ with the appropriate IP addresses and default gateway

$8.$ Use static routing between to communicate between the networks