how do I know if im diving with ratio's or multiplying? please put a equation problem about dividing and multiplying ratios

Factor x2 – 8x + 15. which pair of numbers has a product of ac and a sum of what is the factored form of the

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).

Asunflower was 20 1/2 inches tall. over the next 6 months, it grew to a height of 37 inches tall. what was the average yearly growth rate of the height of the plzzz write a proportion i will give you 100 points