Translate the phrase to an algebraic expression. Use n for the variable unless otherwise stated.two decreased by some number
A. n - 2
B. 2 - n
C. 2 ÷ n
D. 2 + n
Answer: B
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Find the integral.
dx
A. -1 B. 9 C. 1 D. 10
Simplify.
A. 
B. 
C. 
D. 
Solve the problem.The function f(t) = -0.13t2 + 0.49t + 31.5 models the U.S. population in millions, ages 65 and older, where t represents years after 1990. The function g(t) = 0.52t2 + 12.45t + 107.3 models the total yearly cost of Medicare in billions of dollars, where t represents years after 1990. What does the function 
represent? Find 
(10).
A. Cost per person in thousands of dollars. $0.08 thousand B. Cost per person in thousands of dollars. $0.17 thousand C. Cost per person in thousands of dollars. $9.86 thousand D. Cost per person in thousands of dollars. $12.13 thousand
Perform the indicated operations and express your answer in the form a + bi. 
A. i
B. -6i
C. ±6
D. 6i