Please help and explain :)

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Which best describes the construction of a triangle if given the segment lengths of 2 cm, 3 cm, and 5 cm? a) unique triangle b) cannot be determined c) triangle not possible d) more than one triangle

Marco states that 7.696696669…… is a rational number because it is a repeating decimal. is he correct? justify your answer.