Will give !
the cost c, in dollars, of renting a moving truck for a day is given by the function upper c left parenthesis x right parenthesis equals 0.25 x plus 40 comma where x is the number of miles driven.
(d) what is the implied domain of c?
(e) interpret the slope.
(f) interpret the y-intercept.

d:  the domain of C would be [0, ∞]

e:  The slope represents the cost per mile of renting the truck

f:  The y-intercept is the point (0, 40).  That would be the minimum cost of renting the truck

Step-by-step explanation:

d:  The domain is all values x CAN be.  In this problem, x represents the number of miles you are renting the truck for.  You can't have negative distance, so the least amount miles you could rent the truck for is 0 miles.  The most amount of miles you could rent to truck for in a day is an infinite amount of miles.  That's not really possible, but theoretically possible, so it's the upper limit of our domain.

e:  The 0.25 represents the cost per mile, so 0.25x will give you the cost based on how ever miles you drive

f:  The y-intercept is at (0, 40) because $40 is the least cost you could spend on renting the truck because the problem tells us  that there is a flat cost of $40 just for renting the truck.  

you should divide 540 by 18 and you'll get 30 hope this helps you !!