Can anyone help me with H?

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

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?

Solve the formula ax+ by = c for x.