What about this picture? it should be easy but i don’t wanna get it wrong

Answer:
31.5
Step-by-step explanation:
To find the area of the triangle:
A=Lenth * Width
A=7*3=21
To find the area of the triangle:
Area=base * height/2
A=7*3/2
7*3=21
21/2=10.5
21+10.5=31.5