I think the mean of variable a is 4
SA=(a+b+c) h+bh
=(5+12+13)*4+5*12
=20*4+60
=80+60
=140 cm squared
Simplifying makes a algebric expression easily understandable and solvable.
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6/10?
Step-by-step explanation:
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Question is not clear please post question clearly lots of question marks.
