Which of the following coordinates describe a 180 degree rotation of the point (-a, b) about the origin

Use set builder notation to represent the following set: { -3, -2, -1, 0}

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches.approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *

Ineed to know the ordered pairs for this equation i need the answer quick because it’s a timed test