Find x if the perimeter is 23.

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

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?

Which of the following contains a variable?