Write the number in scientific notation.In 1997, the total value of imports and exports for Canada was $318,160,000,000.
A. $3.1816 × 1012
B. $318.16 × 109
C. $3.1816 × 1010
D. $3.1816 × 1011
Answer: D
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Simplify the algebraic expression by combining like terms.-2(9r + 10) + 2(7r + 2)
A. 7r + 8 B. -4r + 10 C. -38r D. -4r - 16
The inverse of the coefficient matrix is given for the system of equations. Use the inverse matrix to solve the system.
; A-1 = - 
A. 
B. 
C. 
D. 
Solve the problem.The function f(t) = -0.15t2 + 0.53t + 30.4 models the U.S. population in millions, ages 65 and older, where t represents years after 1990. The function g(t) = 0.56t2 + 12.6t + 105.6 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. $0.07 thousand B. Cost per person in thousands of dollars. $0.18 thousand C. Cost per person in thousands of dollars. $8.97 thousand D. Cost per person in thousands of dollars. $13.89 thousand
Use matrices to solve the system of equations (if possible). Use Gaussian elimination with back-substitution or Gauss-Jordan elimination.
A. x = -3, y = -4 B. x = 4, y = 3 C. x = -4, y = -3 D. x = -3, y = 4 E. no solution