exam Maths Puzzle Numerical Ability

how would i do the problem 3x^2+4x=7

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exam Other Question

a cotographer is revising a map that will convert all map distances to millimeter.how will he express the distancebetween two places if they are 43 dm apart? If one month there is an increase of 50% and the next there is a decrease of 25% how much was the increase or decrease.