Leo has 59 bricks each measuring 0.19 m long. He lines up the bricks to make a row. Estimate the length of Leo’s row of bricks. Write an equation to model your work.

Find the actual length of the row of bricks. Write an equation to model your work.
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The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.