Find all of the real zeros of the function. Give exact values whenever possible. Identify each zero as rational or irrational.f(x) = x4 - 8x3 + 4x2 + 88x - 165
A. -5 (rational), -3 (rational), 2 + 
(irrational), and 2 - 
(irrational)
B. 5 (rational), 3 (rational), 
(irrational), and -
(irrational)
C. -5 (rational), -3 (rational), 
(irrational), and -
(irrational)
D. 5 (rational), 3 (rational), 2 + 
(irrational), and 2 - 
(irrational)
Answer: B
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Find the mean for the given sample data. Unless otherwise specified, round your answer to one more decimal place than that used for the observations.Last year, nine employees of an electronics company retired. Their ages at retirement are listed below. Find the mean retirement age.52?67?6352?67?5868?54?54
A. 58.8 B. 58.0 C. 58.2 D. 59.4
Find the cubic or quartic function that models the data in the table.
(Quartic)
A. y = -0.01x4 + 0.29x3 - 0.16x2 - 0.23x + 2.26 B. y = -0.01x4 + 0.29x3 - 0.06x2 - 0.23x + 3.23 C. y = -0.01x4 + 0.09x3 - 0.08x2 - 0.23x + 3.23 D. y = 0.01x4 - 0.09x3 - 0.08x2 - 0.23x + 3.23
Solve the problem.Suppose that a sales person observes that if an item is priced at $4 per item then 7 items are sold. If 5 items are sold for $6 per item then find an equation to model the number y of items sold for x dollars per item.
A. y = x + 3 B. y = x + 11 C. y = -x + 11 D. y = -x + 3
Solve.If an object is propelled upward from a height of 384 feet at an initial velocity of 32 feet per second, then its height h after t seconds is given by the equation 
Factor to find an equivalent equation for h.
A. h = -16(t + 4)(t + 6) B. h = -16(t - 4)(t + 6) C. h = -16(t + 4)(t - 6) D. h = -16(t - 4)(t - 6)