Find the rational numbers between -1 by 5 and -2 by 5​

Which of the functions graphed below has a removable discontinuity?

Determine the required value of the missing probability to make the distribution a discrete probability distribution. x p(x) 3 0.23 4 ? 5 0.51 6 0.08 p(4) = nothing  (type an integer or a decimal.)

Witch sequence shows a pattern where each term is 1.5 times the previous term