exam Maths Puzzle Numerical Ability

how do you find the measure of an angle

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find the shortest distance between the parallel lines with equations 5x-12y+33=0 and 5x-12y-6=0 I really need help with this.

The radiatr of a jeep that has a capacity of 8 gallons is full with a solution of 10% antifreeze. How much must be drained and replaced by pure antifreeze to obtain a 25% solution?