// Plug x into the equation
5(0.3)+2y=20
1.5+2y=20
// Subtract 1.5 from each side
2y=18.5
//Divide each side by 2
y=9.25 (C)
3x^2 - 75 =
First factor out the 3
3 (x^2 - 25) =
Now we have a difference of squares
= 3(x + 5)(x -5)
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