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QUESTIONS i NEED HELP ON BELOW:

3. The revenue for a type of cell phone is given by the equation ; R(X) = -20x^2 +500x where x is the number of units sold.

a) what is the revunue if 20 units are sold?

b) what is the maximum revenue?

c)how many cell phones will maximize the revunue?

4.Describe the graphical implications of real zeros ( what happens on the graph when the function has real zeros)?

5. If a function were to have a degree of 5 , list the possibilities for combinations of real and imaginary zeros for the function.

List all possible rational roots for each polynomial and then find all roots.

you can use factoring ,substitution factoring, or synthetic division

f(x)=x^4-3x^3-3x^2+11x-6

f(x)=x^3-3x^2-3x+21

f(x)=x^4+3x^2-4

Given the zeros, find the least polynomial of the given degree.

9.A polynomial of degree 5 with zeros :2 multiplicity of 2,-3,0 multiplicity of 2

10. a polynomial of degree 4 with zeros :1,-4,3i

find the quadratic model for the given data on a number of hours watching tv per household per day since 1960 (t=0 for 1960)

year 1960,1972,1980,1985,1991,2000,2010

#of tvs .87, 1.8, 2.5, 2.6, 3.6, 3.5, 3.3

model_____________

predict the number of hours for 1999_______________

predict the numbers of hours for 2020________________