Question

The function y = -0.72x^4 + 3.2x^3 + 25.9 describes the billions of flu virus particles in a person's body x days after being infected. What is the estimated number of virus particles, in billions, after 4 days?

A) 52.71 billion
B) 51.09 billion
C) 55.32 billion
D) 48.63 billion

Answer 1

The estimated number of virus particles, in billions, after 4 days is 52.71 billion.

Step-by-step explanation:

To find the estimated number of virus particles, we can substitute x = 4 into the function:

y = -0.72*(4 4) + 3.2*(4 3) + 25.9

Calculating this equation, we get:

y ≈ 52.71 billion

Therefore, the estimated number of virus particles, in billions, after 4 days is 52.71 billion.