Please help on 19 this needs to be finished tonight and I’m desperate I need help really bad my mom doesn’t understand this and my dad knows how to do it but can’t explain it and I don’t have any older siblings so I’m on my own when it comes to math please help me please

Please help on 19 this needs to be finished tonight and Im desperate I need help really bad my mom doesnt understand this and my dad knows how to do it but can class=