The equation, y = 76(1.013)x, represents the the population of the united states, after 1900, in millions. the population in 1900 (x = 0)
a. 1.0123 million
b. 76 million
c. 76.988 million
d. 77 million

I assume that the equation is supposedly written as, y = (76)(1.013^x). This means that the population of the United States increases by 1.3% every year. If we substitute 0 to the value of x,
                                    y = 76(1.013^0) = 76(1) = 76
I assume that the unit for  y in the equation is million. Therefore, the answer is letter B. 76 million. 

Ithink the correct answer is d.