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Answer:
7) 120
8) 84
9) 240
Step-by-step explanation:
7) A= bh
A= (40)(30)= 120
8) A= (d1 x d2)/2
A= (14 x 12)/2
A= 84
9) A= 1/2(a+b)(h)
A= 1/2(24 + 16) (12)
A= 240