How can you find f(3) if f(x) = 2x^2 – 5? How would you solve this? Would you do (2)(3)^2 - 5 or 2^6

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

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?

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?