exam Maths Puzzle Numerical Ability

Determine the value of "r" so the line that passes through each pair of points has the given slope

(6,3)(r,2) slope= 1/2

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exam Other Question

(2m^2p^3)^2(4m^2p)^-2/(-3mp^4)^-1(2m^3p^4)^3 I'm trying to figure out a way to solve this equation. i'm thinking that i need to add my own random number in and my own operation, but im not sure

write each equation in stand