Factor completely.81s2 - 100t4
A. (9s - 10t2)2
B. (9s + 10t2)2
C. Prime
D. (9s + 10t2)(9s - 10t2)
Answer: D
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Solve the problem.A trust account manager has $400,000 to be invested in three different accounts. The accounts pay 5%, 6%, and 10%, and the goal is to earn $32,000. Assuming that x dollars are invested at 5%, y dollars are invested at 6%, and z dollars are invested at 8%, what limits must there be on z so that all investment values are non-negative?
A. 150,000 ? z ? 200,000 B. 200,000 ? z ? 240,000 C. 210,000 ? z ? 250,000 D. 150,000 ? z ? 180,000
Solve the problem.In Marike's cash register there are only $5 bills, $10 bills, and $20 bills. There are 176 bills in her cash register and their total value is $2095. There are 35 more $10 bills than $20 bills. How many $20 bills are in her cash register?
A. 52 B. 56 C. 48 D. 87
Find the domain of the rational function.f(x) = 
A. {x|x ? 0} B. {x|x ? 2} C. {x|x ? -2} D. all real numbers
Simplify.- 
(8x - 16)
A. -4x - 8 B. 4x - 8 C. 4x D. -4x + 8