Jessica is selling books during the summer to earn money for college. she earns a commission on each sale but has to pay for her own expenses. after a month of driving from neighborhood to neighborhood and walking door to door, she figured out that her weekly earnings are approximately a linear function of the number of doors she knocks on. she writes the equation of the function like this: e(x)=7x-25, where x is the number of doors knocks on during the week and e (x) is her earnings for the week in dollars. which of the following are reasonable interpretations of the y-intercept of jessica’s function? check all that apply