can someone please help me with my science test, for free (8th grade)? there's 15 questions, mostly about weather. it would mean the world !!

Standard deviation of 19,29,21,22,23

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?

Common binomial factor of 6x(3x+7)+5(3x+7)