Book Maths Puzzle Co-ordinate geometry

How to evaluate the expression and round to two decimal places?(1.49)(-0.5)
How to evaluate the expression in simplest fotm if not possible, why?
15/32 divided (-5/4) these are

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Book Other Question

Systems of Equations

x+y=4y
2x-y=30
The sides of a triangle have lengths x, x square root of 7, and 3x. If the perimeter of the triangle is 18, find x.