Is 1.2122122211 rational or irrational ?

Ihave this math question 2/3 ÷2 1/10=

Δabc is reflected across line l to form δ alblcl, and a¯¯¯al¯¯¯¯ intersects line l at point d. which equation is not necessarily true?

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if