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50 POINTS !50 POINTS! WHO WANT IT WHO WANT TO GET BRAINLIEST ANSWER so this was my math project can someone help me with (Step 7,8,9) I don't get it I tried Step 7 plz check if it's correct plz plz plz help me

50 POINTS 50 POINTS WHO WANT IT WHO WANT TO GET BRAINLIEST ANSWER so this was my math project can someone help me with Step 789 I dont get it I tried Step 7 plz class=