exam Maths Puzzle Numerical Ability

Solve this equation.

sqrt x -1 = 3

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exam Other Question

Rose's garden is in the shape of a trapezoid. If the height of the trapezoid is 16m, one base is 20m and one is 224m^. Find the length of the other base.

PLEASE EXPLAIN! anybody know this

3/5-3x<_1

thanks