In a group of nineteen people, each person shakes hands once with each other person in the group. How many handshakes will occur?

(1,4) is on graph of f(x)

f(1) = 4

so 1/4 f(x)

1/4 f(1)

1/4. ×4

1

so point for function 1/4. f(x) is (1,1)

i’m here for points.

i think the length is 12 and the width is 17