The Miss Petra Psychic Hotline charges $5 for the first minute and $2 for each additional minute. Let $\displaystyle{C}\usepackage{cmbright}\Huge\$ represent the total cost of a call and $\displaystyle{M}\usepackage{cmbright}\Huge\$ represent the number of minutes that the call lasted.

i) Give an equation that describes the situation.

ii) Determine the cost of a 15 minute call.