5is multiplied by the difference of 7 and a number

5(7 - x).

Step-by-step explanation:

That is 5 multiplied by 7 - x   where x is the number.

The probability is 0.2177.

The z-score associated with this income is

z = (525-490)/45 = 0.78

Using a z-table (http://www.z-table.com) we see that the area to the left of this score, less than the score, is 0.7823.  We want the probability greater than this score, so we subtract from 1:
1 - 0.7823 = 0.2177.