Use the quadratic formula to solve for x. 4x2 +9x-1=0

The following frequency table relates the weekly sales of bicycles at a given store over a 42-week period.value01234567frequency367108521(a) in how many weeks were at least 2 bikes sold? (b) in how many weeks were at least 5 bikes sold? (c) in how many weeks were an even number of bikes sold?

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15

Need on this geometry question. explain how you did it.