Sketch the graph of the equation. Identify the vertex and the intercepts.y = x2 + 2x - 3
A. Vertex: (1, - 4);
x-intercepts: (-1, 0) and (3, 0);
y-intercept: (0, -3)
B. Vertex: (- 1, - 4);
x-intercepts: (3, 0) and (1, 0);
y-intercept: (0, -3)
C. Vertex: (- 1, - 4);
x-intercepts: (-3, 0) and (1, 0);
y-intercept: (0, -3)
D. Vertex: (1, - 4);
x-intercepts: (-1, 0) and (3, 0);
y-intercept: (0, 3)
Answer: C
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Determine whether the system is consistent or inconsistent and whether the equations are dependent or independent.-3x + 3y = 156x + 5y = 91
A. Inconsistent; independent B. Consistent; independent C. Consistent; dependent D. Inconsistent; dependent
Determine if the equation specifies a function with independent variable x. If so, find the domain. If not, find a value of x to which there corresponds more than one value of y.x - y2 = 9
A. A function with domain ? B. Not a function; for example, when x = 10, y = ±1
Solve the problem.Find the area A and circumference C of a circle of diameter 20 mi. Use 3.14 for ?. Round the result to the nearest tenth.
A. A = 314 mi2; C = 62.8 mi B. A = 1256 mi2; C = 31.4 mi C. A = 125.6 mi2; C = 31.4 mi D. A = 62.8 mi2; C = 62.8 mi
Solve.Computer sales in the United States have increased since 1992. The polynomial 
can be used to approximate the number of computer sales during the years 1990-2000 where x is the number of years after 1990 and the value of the polynomial is the computer sales (in millions). Approximate the number of computers sold in 1998. Round the answer to the nearest tenth of a million.
A. 10.2 million computers B. 13.5 million computers C. 12.0 million computers D. 15.1 million computers