Can someone help me with number 3?

Which equation represents a proportional relationship that has a constant of proportionality equal to 1/5

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?

Find the value of x. give reasons to justify your solutions! c ∈ ae