What is the image of the point (-7,9) after a rotation of 270° counterclockwise about the origin?

Can some one explain this i got sent this. is this a threat i’m scared

Carley bought a jacket that was discounted 10% off the original price. the expression below represents the discounted price in dollars, based on x, the original price of the jacket.

If f(x) = 4x - 3 and g(x) = x + 4, find (f - g) (x)