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a) (8ab^7)(-7a^-5b^2)
 
= (8*(-7))a^(1-5)b^(7+2) = -56a^(-4)b^(9) = -56b^9/a^4

b) (4y)^2 (3y^3)
 
= 3*4^2y^2y^3 = 48y^(2+3) = 48y^5

c) (2x)^5(3x)^2
 
= 2^5 x^5 3^2 x^2 = 32*9 x^(5+2) = 288x^7