Respuesta :

Answer:

I hope this helps you

Step-by-step explanation:

A = 1/2 h (a+b)

= 1/2 × 8 (15+21)

= 1/2 × 36 × 8

= 36×4

= 144

Answer:

29

Step-by-step explanation:

18+15=23 8+21=29