Answer :
Final answer:
To find the value of Y(x) at x = 8 feet, plug x = 8 into the polynomial Y(x) = 0.03x³ - 0.002x² - 0.0005x + 20, resulting in the value of approximately 35.228. There might be a rounding or typographical error as this does not match the given options exactly.
This correct answer is a)
Explanation:
The value of the function Y(x) at x = 8 feet can be directly evaluated from the given function Y(x) = 0.03x³ - 0.002x² - 0.0005x + 20. By substituting x = 8 into the equation:
Y(8) = 0.03(8)³ - 0.002(8)² - 0.0005(8) + 20
Calculate each term:
0.03(8)³ = 0.03(512) = 15.36
-0.002(8)² = -0.002(64) = -0.128
-0.0005(8) = -0.004
+ 20
Summing those up gives:
Y(8) = 15.36 - 0.128 - 0.004 + 20 = 35.228
However, this value does not match directly with any of the presented multiple-choice answers, indicating a possible error in the question or in the interpretation of the information provided. The value that most closely resembles the correct calculation is option (a) 35, but one must assume a rounding or typographical error to choose this.
This correct answer is a)