Help me solve part a and part b

Applying Algebra to the Real World Reference 5.1 Polynomial Functions p353-354. a) The rhinovirus is often the source of the common cold. After x days of invasion by the viral particles, the number of particles in our bodies, p(x), in billions, can be modeled by the polynomial function p(x) : 0.75x4 + 3x3 + 5. a) Complete the chart to estimate the number of viral particles after x days of invasion. (+3 points) x, days of p(x),viral particles in billions invasion (include two decimal places) billion particles billion particles billion particles billion particles b) What conclusions can be drawn about the number of viral particles in our bodies over time? Use the chart and/or the graph to support your conclusion. I am looking for more than just general statements (use specific mathematics in your conclusion). One or two sentences wiil probably not fully answer this question. (+3 points)