What is runoff voting

okay.

Step-by-step explanation:

Runoff voting can refer to:

Two-round system, a voting system used to elect a single winner, whereby only two candidates from the first round continue to the second round, where one candidate will win.

Instant-runoff voting, an electoral system whereby voters rank the candidates in order of preference.

Contingent vote, a two-round system of instant-runoff voting.

Exhaustive ballot, a reiterative voting system, whereby rounds of voting continue (with or without elimination) until one candidate achieves a majority, also called repeated balloting.

answer: rolling a number cube and flipping a coin.

step-by-step explanation:

(5x-1)^2= (5x)^2-2(5x)×1+(1)^2=25x^2-10x+1