Calculate the perimeter of this shape.
12 cm
18 cm

Can someone me with this problem i don't understand i need

Ineed to know the answer to this algebra question.

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?