Answer: 30
Reason: you divide 60=2x which makes x=30
This is for the first one
1. (4x+5y)(2x-3y)+3xy= 4x*2x-4x*3y+5y*2x-5y*3y+3xy=8x^2-12xy+10xy-15y^2+3xy= 8x^2+xy-15y^2
2. (2x^2+3)(4x+5)-8x(x^2-2)=2x^2*4x+2x^2*5+3*4x+3*5-8x*x^2+8x*2=
=8x^3+10x^2+12x+15-8x^3+16x=
=10x^2+28x+15
75, 73, 76, 78, 79, 78, 79, 81, 80, 82, 81, 84 what is the mean
Ugo [173]
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