What is point a (-9, -18) rotated 90° counterclockwise?

(18, - 9 )

Step-by-step explanation:

Under a counterclockwise rotation about the origin of 90°

a point (x, y ) → (- y, x ), thus

A(- 9, - 18 ) → (18, - 9 )

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step-by-step explanation:

y=sec x is the correct answer

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