Acar rental costs $50 for the first day. additional days cost $35 per day, unless the car is rented for 7 days or more, in which case there is a 10% discount on the daily rate.

identify the expression which represents the cost of renting a car if the car has been rented for more than a week.
a) 45 + 35x
b) 45 + 31.5x
c) 50 + 35x
d) 50 + 31.5x

  D) 50 + 31.5x

Step-by-step explanation:

The expression for less than 7 days is 50 + 35x.

7 or more days has a 10% discount on the daily rate (35):

35 - 35(0.10)   =   35 - 3.5  =   31.5

So, the new expression is: 50 + 31.5x

answerim :

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step-by-step explanation:

im not sure but my dad knows

this is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

plug in the 3.20 and the 16 to solve for the "k". this is the constant of proportionality. it is the value that will not change.

3.20 = k(16). solving you get $.20 per text.

the equation would then be y = .20x