exam Maths Puzzle Numerical Ability

please help to

simplify by adding like terms :

- 4mn^2/m^-1 + 2mn^2m^-1 - 7m^3/mn^-2

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exam Other Question

In a triangle, the measures of two angles are in the ratio 5:2 and their difference is 15 degrees. Find the number of degrees in the largest angle of the triangle. 1.7 ft. short of the endzone, how many more yards to the touchdown?