I need help with 8 and 9

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

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?

3x + 4y = 5 x- 3y = -7 solve by substitution