PLEASE HELP! WILL GIVE BRAINLIEST

Which system of linear inequalities is graphed? can somebody pleasssse

1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?