Function 32 f (32) = 120 + 5 (32 - 30) 36 f (32) = 120 + 5 (36 - 30) 38 f (32) = 120 + 5 (38 - 30) 40 f (32) = 120 + 5 (40 - 30)

This is the concept of algebra, we are required to write the function representing the expression given.

After the the numbers were substituted we got:

1.

f (32) = 120+5 (32-30)

given that 120, 5 and 30 are not changing in all the consecutive substitutions, it implies that they are constant.

Therefore the rest are variable, hence our expression can be written as:

f (x) = 120+5 (x-30)

The above expression is a straight line equation, representing a linear expression between variables.