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 figures 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 she 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.

#2, her earnings will increase by $20 for each door knocked.

Step-by-step explanation:

Since the only variable used to determine earnings is the number of doors knocked, you can eliminate options 1 and 3 as they are based on the number of books sold, which is not a part of the equation.

That leaves the only options being the increase of $20 or $50 for each door knocked. As the x value us multiplied by 20, the correct answer is #2, her earnings will increase by $20 for each door knocked.

You can also check this by plugging in values:

Assume 10 doors are knocked:

E(10) = 20(10)-50 = 200-50 = 150

Assume 11 doors (1 more door) is knocked:

E(11) = 20(11)-50 = 220-50 = 170

The increase from 1 door is $20.

10.416 m/s

step-by-step explantion:

distance=100m

time= 9.6s

average speed=100/9.6

=10.416 m/s