Answer:
0.6 
Explanation:
Given the trapezoid formula: 
 1/2(b1+b2/2)xH 
 We are given the numbers for the trapezoid: 
 0.3,0.9,1 
 To solve this here is what we are going to do. 
 1/2(0.9+0.3)x1 
 So add 0.9+0.3=1.2 
 Then Divide 1.2/2=0.6 
 So multiply 0.6 x 1=0.6 
 0.6 is your answer