the centre of circle having radius 3 Units lies in the third quadrant if the circle touches the x axis at (-4,0) then find the equation of circle​

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

Find the magnitude, correct to two decimal places, made by each of the following with positive direction of the x axis a) y= x the answer is 45° but i don’t know how

If the tip varies directly with the number of guest which equation represents between the tip,t, and the number of guest,g?