Answer for brainlest pls

Step-by-step explanation:

the polygon can be separated in two parts

let's figure out the area of the rectangle

recall that,

given that,

thus substitute:

simplify multiplication:

let's figure out the area of the triangle

remember that,

substitute the value of b and h:

reduce fraction:

now the area of the polygon would be the total area of the rectangle and triangle thus

simplify addition:

hence our answer is D)