exam Maths Puzzle Numerical Ability

12b squared+23b-5=-15

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Would someone show me step by step how to figure out this word problem? Thank you
The length of a rectangle is 1cm more than 5 times its width. If the area of the rectangle is 79 cm^2, find the dimensions of the rectangle to the nearest thousandth. Two angles are supplementary, and one is 5� more than six times the other. Find the larger angle.