exam Maths Puzzle Numerical Ability

i need help solving this equation

|-15+9| (absolute value)
im guessing the correct answer would be 6 but wanted to make sure

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exam Other Question

write an equation for the conic section
1.ellipse with vertices at (5,0)and (-5,0), and co-verticles at (0,2)and (0,-2)
2.ellipse with center at (-3,1), verticles at (-1,1) and ( the perimeter of a rectangle is twice the sum of its length and its width. the perimeter is 34 meters and its length is 2 meters more then twice its width. What is its length?