Solve the problem.The number of mobile phones sold in a given year is approximated by 
where x represents the number of years since mobile phones became readily available. The corresponding polynomial for phones is 
Find the polynomial that represents how many more mobile phones than phones were sold in a given year.
A. -4x4 + x3 + 5x2 - 9x + 11
B. 4x4 - x3 + 13x2 - 3x + 9
C. -4x4 - x3 - 2x + 10
D. -4x4 + x3 + 12x2 + 3x - 9
Answer: B
You might also like to view...
Solve the problem.The solid lies between planes perpendicular to the x-axis at x = -2 and x = 2. The cross sections perpendicular to the x-axis are circles whose diameters stretch from the curve 
to the curve 
Find the volume of the solid.
A. 49?
B. 49?2
C. 
?2
D. 
?2
The management of AstroWorld ("The Amusement Park of the Future") estimates that the number of visitors (in thousands) entering the amusement park t hours after opening time at 10 A.M. is given by
?
?
per hour. Determine the number of visitors admitted by noon.
?
A. 10,667 B. 11,119 C. 11,244 D. 10,338
Solve the problem.In the formula A = Iekt, A is the amount of radioactive material remaining from an initial amount I at a given time t and k is a negative constant determined by the nature of the material. A certain radioactive isotope decays at a rate of 0.225% annually. Determine the half-life of this isotope, to the nearest year.
A. 3 yr B. 308 yr C. 134 yr D. 222 yr
Solve the system by the substitution method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. 
B. 
C. 
D. 