Is the graph a linear function, nonlinear function, or relation?

Twelve less than a number is at most 20

The price of a visit to the dentist is calculated according to the formula 50+100n50+100n where nn is the number of cavities the dentist finds. on your last visit to the dentist, 22 cavities were found. what was the cost of your visit?

Which of the following vectors are orthogonal to (2,1)? check all that apply