Book Maths Puzzle Co-ordinate geometry

affects of the coefficient A in the equation Y=Asquared+Bx+C

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Book Other Question

7 1/10 subtracted from 4 2/5 (x decreased eight times) multiplied by (y increased three times)

Is this written correctly? ( x - 8x ) * ( y + 3y )

If this is correct ----- the second part of the problem