If you mean 2 times 80 then the product is 160
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The solution to the problem -10-2x-45 is 80 from the simplified form (90-10).
2x * 2x (2*2=4) therefore, 2x*2x equals 4x2.
Assuming the 78 is 80% of the class and a 60 is passing: 78*.80 + x*.20 = 60 .2x + 62.4 = 60 .2x = -2.4 x = -12 So you cannot really fail the class. (If you need a 70 to pass the class you need at least a 38.)
2x-4y=-8-2x......-2x-4y=-2x-8(-4y)/-4 | (-2x-8)/-4y=1/2x+2
-2x-2x-2x-2x-2=-32