Question

Me ajudem aí gente °.°

Answer 1

a)
A= (B+b)h/2
A= (5+3)4/2
A= (8)4/2
A= 32/2
A= 8 cm²

b)
9= (B+1,5)3/2
9x2= 3B+4,5
18= 3B+4,5
3B=18-4,5
3B=13,5
B=13,5/3
B=4,5