PLEASE HELP WILL GIVE 15 POINTS AND GOOD RATINGS

Determine whether each relation is a function. Explain.

{(1, 12), (4, 18), (7, 22), (10, 28)}

a.
yes; Each element of the domain is paired with exactly one element of the range.

b.
yes; Each element of the range is paired with exactly one element of the range.

c.
no; Some values of the domain are paired with more than one value of the range.

d.
no; Some values of the range are paired with more than one value of the domain.

When constructing a perpendicular line through a point off a line, how can you verify that the lines constructed are perpendicular? check the angles used in the construction with a straightedge to ensure consistency. check the distance along the lines at several places with a compass to ensure they are the same length. check the intersecting lines with the corner of a piece of paper to ensure the lines create 90° angles. check the distance between the lines at several places with a compass to ensure they are equidistant. question 2(multiple choice worth 1 points) (01.03 lc) which of the following steps is included in the construction of a perpendicular line through a point on a line? connect arcs that are above and below the given line with a straightedge. connect arcs that are above the original line with a straightedge. create arcs on either side of a point that is off the given line. create a copied angle by using the first two lines as the original angle.