Solve the problem.The following graph indicates the hourly temperature in Riversbend, IL from 11 P.M. on March 6, 2008 to 7 A.M. on March 7, 2008. The function t(x) = -1.29x2 + 8.80x + 42.69 can be used to estimate the hourly temperature in Riversbend, where x is the number of hours after midnight. Use the graph to determine the hour(s) that the temperature was a maximum.
A. 7 A.M.
B. 11 P.M.
C. 3 A.M., 4 A.M.
D. 2 A.M.
Answer: C
Mathematics
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Solve the problem.A bridge is built in the shape of a parabolic arch. The bridge arch has a span of 174 feet and a maximum height of 30 feet. Find the height of the arch at 15 feet from its center.
A. 29.1 ft B. 21.8 ft C. 0.2 ft D. 3.6 ft
Mathematics
Factor completely using the grouping method to factor trinomials. If unfactorable, indicate that the polynomial is prime.7x2 + 23x + 20
A. prime B. (7x + 4)(x - 5) C. (7x - 5)(x + 4) D. (7x + 5)(x - 4)
Mathematics
Write a numerical expression for the phrase and simplify it.Three-eighths of the sum of -7 and -9.
A. 
[(-7) + (-9)]; -6
B. 
[(-7) + (-9)]; -12
C. (3 + 8)(-7) + (-9); -86
D. 
+ [(-7) + (-9)]; 1
Mathematics
Subtract.-2.9 - 8.3
A. -11.2 B. -5.4 C. 11.2 D. 5.4
Mathematics