Find the value(s) of the function, subject to the system of inequalities.Find the maximum and minimum ofz = 6x + 21y subject to x ? 0, y ? 0, 4x + 5y ? 30, 4x + 3y ? 20, x ? 5, y ? 8.
A. -126; 0
B. -97.5; -126
C. 30; 0
D. 30; -126
Answer: D
Mathematics
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Solve the problem.The revenue for a small company is given by the quadratic function 
where t is the number of years since 1998 and r(t) is in thousands of dollars. If this trend continues, find the year after 1998 in which the company's revenue will be $2185 thousand. Round to the nearest whole year.
A. 2009 B. 2011 C. 2010 D. 2020
Mathematics
Factor the trinomial.15x2 - 14xy - 8y2
A. (3xy - 4)(5xy + 2) B. (3x + 4y)(5x + 2y) C. (3x - 4y)(5x + 2y) D. (15x - 4y)(x + 2y)
Mathematics
Solve.y2 - x2 = 20x - 8 = y
A. 
B. 
C. 
D. 
Mathematics
Solve.
= -21
A. x = 84 B. x = 25 C. x = -84 D. x = -63
Mathematics