Question

statins are used to keep cholesterol in check and are a top - selling drug in the u.s. the equation: $s = 4.7+1.3x$ estimates the amount of sales ($s$) of statin in billions of dollars $x$ years after 1998. a. find the sales of statin in the year 2012 (in billions of dollars, rounded to 1 decimal place)? answer: 22.9 billion dollars. part 2 of 2 b. find the year in which sales of statin were 10.9 billion dollars (rounded to nearest year)? answer:

Explanation:

Step1: Calculate years after 1998

Set $S=10.9$, solve for $x$.
$10.9 = 4.7 + 1.3x$

Step2: Isolate the $x$-term

Subtract 4.7 from both sides.
$10.9 - 4.7 = 1.3x$
$6.2 = 1.3x$

Step3: Solve for $x$

Divide by 1.3.
$x = \frac{6.2}{1.3} \approx 4.77$

Step4: Find the target year

Add $x$ to 1998.
$1998 + 4.77 \approx 2002.77$

Answer:

2003