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Evaluating the value of n

4.) 45-5n

45-5(3)

45-15= 30

5.) (n+6.8)•10

(3+6.8)•10

9.8•10 = 98

6.) (25-n)÷11

(25-3)÷11

22÷11= 2

7.) n²+6

(3)²+6

9+6= 15

8.) n(5+8)

3(5+8)

15+24= 39