the manager went over the sales of mobile phones at the store and found that the mean sale was 45, with a standard deviation of 4. on a particular day, 52 mobile phones were sold.
what is the z-score of the sale of mobile phones on that day?

What is the vertex form of f(x) = x2 + 6x + 3

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

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?