Awater desalination plant can produce 2*10^6 gallons of water in one day. how many gallons can it produce in 79 days? write your answer in scientific notation.

What is x and y (use substitution? ) 5x+3y=38 and y=3x+8?

The median of a data set is the measure of center that is found by adding the data values and dividing the total by the number of data values that is the value that occurs with the greatest frequency that is the value midway between the maximum and minimum values in the original data set that is the middle value when the original data values are arranged in order of increasing (or decreasing) magnitude

Could somebody me with this radical simplification?