How to do it step by step and solving it

Use the distributive property to eliminate parentheses.

... 2x - (3/4)·2x - (3/4)·80

... 2x -(3/2)x - 60 . . . . . simplify the terms involving fractions

... x(2 - 3/2) - 60 . . . . . identify the x coefficients you need to add together

... (1/2)x - 60 . . . . . . . . simplified form

You have not shown an equation, so there is nothing here to solve.

22, 28, 34, 40, 46

b)   f(n) = 6n + 16

n = what is the number of the row ( 22 would be row 1) so if we replaced n with 1, we would get 22

c)   the 14th row will have 100 seats

(1)   (2)   (3)   (4)   (5)   (6)   (7)   (8)   (9)   (10) (11) (12) (13) (14)

22 | 28 | 34 | 40 | 46 | 52 | 58 | 64 | 70 | 76 | 82 | 88 | 94 | 100