What is the constant of proportionality for the relationship shown in this table? x 3 6 9 12
y 1 2 3 4

16

13

3

9

step-by-step explanation:

i believe its "c" because all of the other options include a but it could be d because there is a way of financing with cash at certain places but its uncommon.

6(h+1)/2=a

a=area

step-by-step explanation:

its the same thing as a square or rectangle but after multiplying two sides you need to divide it by two.