exam Maths Puzzle Numerical Ability

Please factor. Thanks!

18x^2-30x

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How many gallons of a 0% solution must be mixed with 60 gallons of 5% solution to obtain a 3% solution? hi! i need to know the area of a regular 5 sided polygon, each side being 10cm.

the forumula for area is 1/2 the perimeter multipiled by the apothem the perimeter is 50, but i c