Which of the following functions are linear? Two function tables. Function A. when X is three, why is nine. When X is six, why is 36. When X is nine, why is 81. When X is 12, why is 144. When X is 15, why is 225. Function B. When X is 5, why is 8. When X is 10, why is 16. When X is 15, why is 24. When X is 20, why is 32. When X is 25, why is 40. A. 5 cm
B. 15 cm
C. 21 cm
D. 32 cm