Can someone help me explain this & whats the answer ?

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?

Explain how you can use the associative property to evaluate (7x50)x4.

Write the pair of fractions as a pair of fractions with a common denominator