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Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

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?

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps