What is the value of P in the equation 3p + 1 =28

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

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?

Combine like terms to make a simpler expression 3z+z