People, answer me. -9d=63 d= -7, right? a person @runhereicome kept saying that the correct answer is 7 and offended my race i only told him why the answer is -7 not 7, but he said that i'm bad at math who is correct?

Which of the following is the result of expanding

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?

See attachment below and find the equivalent of tan(∠qsr)