Answer
$y=645.68 \ \text{billion}$
(answers may vary)
Work Step by Step
We plug in 48, since it has been 48 years since 1970. This gives:
$y=13.34(48)+(5.36)$
Now, we use PEMDAS, a method for simplification. This acronym reminds us that we must first address parentheses, and then exponents. Next, we address multiplication and division, going from left to right. Lastly, we simplify addition and subtraction from left to right. This gives:
$y=645.68 \ \text{billion}$
