exam Maths Puzzle Numerical Ability

The area of a rectangle of length x is given by 3x^2+5x. Find the width of the rectangle. Help please I do not understand this.

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exam Other Question

whats the radius of a circle with the area of 192 cm is what is the expected values of the following probability distribution.
y p(y)
5 .15
10 .25
15 .05
20 .20
25 .35