Find the largest open intervals where the function is concave upward.f(x) = x4 - 8x2
A. (-?, -2
/3)
B. None
C. (2
/3, ?)
D. (-?, -2
/3), (2
/3, ?)
Answer: D
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Solve the indicated equation analytically.The weekly sales in thousands of items of a product has a seasonal sales record approximated by 
where t is the time in weeks with t = 1 referring to the first week in the year. During which week(s) will the sales equal 99,650 items?
A. week 4, week 20, and week 52 B. week 21 and week 30 C. week 30 and week 47 D. week 4 and week 47
Solve.Find the length of the roof(R) shown. Round to the nearest hundredth of a foot.
Fill in the blank(s) with the appropriate word(s).
Write each equation in standard form and identify a, b, and c. 7x2 = 9x - 21
A. a = 7, b = -9, c = -21 B. a = 7, b = -9, c = 21 C. a = 7, b = 9, c = 21 D. a = 7, b = 9, c = -21
Provide an appropriate response.Which of the following is not associated with a mortgage loan?
A. equity B. unsecured debt C. real property D. collateral