It is difficult to be certain what the question is because the browser used by this site for posting questions is almost totally useless for mathematical questions: it rejects or garbles most symbols.
If I understand correctly, your question is to find the value of
7.6*10^-4 m x 1.5*10^7 m.
If so, the answer is 1.14*10^4 square m.
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(-15) + 91 = 76 [ -5 times (-15) ] + 1 = 76 (-1,140) / (-15) = 76
76 multiplied by 15 = 1,140
76/10 or 38/576/10 or 38/576/10 or 38/576/10 or 38/5
1 cg = 10 mg so 76 cg = 76*10 = 760 mg. Simple!
15%