Simplify.
A. 
B. x
C. 9x
D. 
Answer: A
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Simplify.(5x - 4y + 2) - 2(-5x + 4y - 2)
A. 10x - 8y + 4 B. -15x + 12y - 6 C. 15x - 12y + 6 D. -10x + 8y - 4
Determine where the function is concave downward.
?
?
A. 
B. ?
C. ?
D. ?
Solve the problem.The half-life of an element is 4.9 × 108 yr. How long does it take a sample of the element to decay to 
of its original mass? Express results in scientific notation, rounded to the nearest hundredth.
A. 1.09 × 108 yr B. 5.36 × 108 yr C. 3.11 × 108 yr D. 6.48 × 108 yr
A group of private investors purchased a condominium complex for $4 million. They made an initial down payment of 12% and obtained financing for the balance. If the loan is to be amortized over 12 years at an interest rate of 13% /year compounded quarterlly, find the required quarterly payment. Please round the answer to the nearest cent.
a. $144,172.53 b. $143,175.06 c. $147,533.39 d. $145,809.68 e. $147,646.05