Solve the system mentally, without the use of a calculator or pencil-and-paper calculation. Try to visualize the graphs of both lines.x + 0y = 90x + y = 4
A. x = 9; y = 4
B. x = 4; y = 9
C. x = 9; y = 2
D. x = 2; y = 
Answer: A
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The standard deviation for this set of numbers: 5ft, 5ft, 5ft, 5ft; is
A. 5ft B. 0 C. 4 D. none
Translate the sentence into an equation and solve it.Twenty-seven less than eight times a number is equal to five. Find the number.
A. 27 + 8n = 5, n = -4 B. 8n + 27 = -5, n = -4 C. 8n - 27 = 5, n = 4 D. 27 - 8n = 5, n = 3
Solve by graphing.In one U.S. town the annual consumption y of beef (in kg per person) can be estimated by the linear equation 
where x is the number of years since 1975. Graph the equation and use the graph to estimate the beef consumption in the year 1995. 
A. 30 kg per person B. 13 kg per person C. 16 kg per person D. 10 kg per person
Find the exact value of the trigonometric expression without the use of a calculator.tan 
A. 
- 2
B. 2 - 
C. -2 - 
D. 2 + 