This is so difficult can someone pls help me

Segment xz is bisected by point y. if xy = 12x, and the measure of xz = 18x – 6, solve for x

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?

What ia the sum if the first 7 terms of the geometric series