exam Maths Puzzle Numerical Ability

-4 sq root3 - sq root36 + 3 sq root 48 =?

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the speed of the airplane in still air is 186mph. the plane travals 538 mi againt the wind and 1415 mi with the wind in a total time of 12 hr. what is the speed of the wind The width of a rectangle is 3 inches less than one-half of its length. If the perimeter of the rectangle is 42 inches, find the area of the rectangle.