Which value must be added to the expression x^2+16 to make it a perfect square trinomial

Sunday: 1 1 2 monday: 1 tuesday: 2 1 2 wednesday: 1 3 4 thursday: 2 friday: 1 1 2 saturday: 2 jenna is a swimmer and trains every day. the schedule shown outlines the number of hours she trains each day. what is the total number of hours that jenna trains during the week?

Ineed me i stuck and i don’t want to get it wrong

Simplify. 3(4+4x) (type your answer in with no spaces)