Given that the value of the car is given by the function:
y=15000(1/5)^x
the graph will be represented as follows:
From the graph we see that the domain is all real numbers.
59.4cm
Use Pythagorean theorem to find the diagonal (^ means exponent)
a^2 + b^2 = c^2
42^2 + 42^2= c^2
1764+1764=c^2
3528=c^2
square root both sides
c= 59.39696962
round and you get 59.4 cm