How do I solve this inequality!

Ineed i do not understand i'm only 8

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 is the value of x in the equation 2(x-4) = 4(2x + 1)?