In 1963 the number of cars in the US was about 1.7 million. By 1988 it had increased to about 2.9 million. Write an exponential function in the form of y = abˣ that could be used to model the number of cars y in millions for 1963 to 1988. Write the equation in terms of x, the number of years since 1963. Round the value of b to the nearest thousandth.
a) y = 1.7(1.042)ˣ
b) y = 1.7(1.032)ˣ
c) y = 1.7(1.052)ˣ
d) y = 1.7(1.022)ˣ