Write an expression for the total cost of admission and r rides if an amusement park charges $5 for admission and $2 for each ride

Which of the following would be a reasonable estimate for the weight of a pencil? a. 1 × 10^-20 lb b. 1 × 10^20 lb c. 1 × 10^2 lb d. 1 × 10^-2 lb