Help me with this, please

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

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?

Twelve less than a number is at most 20