What is the ratio 3:4 of 21?

Which point is a solution to the inequality shown in this graph (-3,-3)(3,-1)

Plzzz maths ! quadratic sequences=an^2+c 1) 11,17,27,41,59 2) 7,16,31,52,79 3) 6,18,38,66,102 4) 0,9,24,45,72 5) 0,12,32,60,96

Which number produces a rationale number when multiplied by 1/5