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1) D

quantity*value=total price

total value=15A+10B

2) C

3) B

2x^2+3xy-4y^2

given x=2, y=-4

substitute values of x,y in the equation

2(2^2) + 3*2*(-4) - 4*(-4)^2

2*4 - 24 - 4*16= 8-24-64

= -80

4) D

area of circle= pi* r^2

area of shaded region= area of bigger circle- area of smaller circle

5) D

(3x-2y)^2

general formula (x-y)^2= x^2+y^2 -2xy

9x^2 +4y^2 - 12xy

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