exam Maths Puzzle Numerical Ability

Please help me with this problem (show your work)

( 7 x 10^3) x (8 x 10 ^-9)

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exam Other Question

write the GCF of each polynomial

12x^3+6x^2-3x

18x^2+16x-12x^3

6y^2-12y^3+36y^4 I can not find the correct answer to this one I got -5/1 for my answer. I need to find the slope of any line perpendicular to the line through points(0,5) (-3,-4)help me if you can.