Andy C. answered • 07/09/18

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The previous 9 assignment comprise 70% of the grade.

Let M be the average of these 9 assignments, where 0 < M < 100

0.7M + 0.3X >=70

7M + 3X >= 700

3x >= 700 - 7M

x >= (700 - 7M)/3

So if your average is M=70, then X >= (700 - 7*70)/3 = (700 - 490)/3 = 210/30 = 70

If the average is M=80, then X >= (700 - 7*80)/3 = ( 700 - 560)/3 = 140/3 = 46 and 2/3

If the average is M=60, then x >= (700 - 7*60)/3 = (700 - 420)/3 = 280/3 = 93 and 1/3