The answer is D: rectangle
For 19 it is number 2 that does not have x = 20.
for 20 its the last one that the variable does not equal 12.
the answer for 21 is 6.
and the answer for 22 is 72.
Step-by-step explanation:
d = z - 9
d = 10 - 9 ----> substitute
d = 1
Simply divide 3 by 0.7,

Or ≈ 4.28571 which is ≈ 4 years.