Y= 40+(20x), where you asking for something like that?
The unknown number would be 11
738 + 164 = 902
902 / 82 = 11
Ans: 11
The answer for number 4 is 13 and number 6 is 121 and the last problem for number 7 is 112
7.750 and 7.7500 are 2 equivalent fractions.