book Maths Puzzle Numerical Ability

please help me solve this: (4p-7q)+(5q-8p)

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book Other Question

Calculate the least velocity of projection required to give a missile a horizontal displacement of 500 m if the angle of projection is 24 degrees. If the L in the xy-plane has one-third the slope and five times the y-intercept of the line 5x-3y, then the equation for L is?

Please help me solve this question I never did