Write the system in the form 
Then solve the linear system by computing 
with a calculator. Round numbers to the nearest tenth, as necessary.2.6x - 0.7y + 5.3z - 3.4w = 12.9 6.5y + 0.7w = -1.8 4.0z - 2.2w = 1.54.9x + 0.6w = 3.2
A. (2.2, 1.1, -6.4, -12.4)
B. (-2.2, 1.1, -6.4, 23.3)
C. (2.2, 1.1, 7.2, 12.4)
D. (2.2, -1.1, -6.4, 7.6)
Answer: A
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The data in the figure below represents the number of stars earned by 100 performers in a talent competition.
What is the mean number of stars earned by the performers?
A. 2.5 B. 1.9 C. 2 D. 1.95
Solve the problem.Suppose that the number of inhabitants of Country A is given by 
million, and the number of inhabitants of Country B is given by 
million, where x is the number of years since 2010. When the number of inhabitants of Country A equals the number of inhabitants of Country B, how many people inhabit each country?
A. 848,346,000 people B. 849,798,000 people C. 847,620,000 people D. 849,072,000 people
The polynomial is given in one of the three forms: standard, root, or factored. Change it to the specified form. f(x) = -4x2 + 4x + 80; write in root form
A. f(x) = 4(x - 5)(x + 4)
B. f(x) = -4(x - 5)(x + 4)
C. f(x) = - 
(x - 5)(x + 4)
D. f(x) = -4(x + 5)(x - 4)
Name the abscissa of the point below.
A) –4
B) 4
C) 0
D) 2
E) –2