Plz help due tomorrow i need the last part done and the answer are addition division multiplication and subtraction

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

Aflower has 26 chromosomes. to create a new flower, how many chromosomes would a sperm cell have? what is this process called? part 2: within a flower cell that has 26 chromosomes, how many chromosomes would a cell that is created within the stem of a flower as it grows, have? what is this process called?

We just started the introduction into circles and i have no idea how to do this.