The 3rd term of an arithmetic sequence is - 1 and the 7th term is - 13.find the explicit formula for this sequence. what is a22?

Nnnnneeedd 1.find the residual if you know the actual number is 5.2 and the predicted value is 4.8

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.

Me n o w. i need t h i s. 10 points