Use a system of linear equations in two variables to solve the problem.A flat rectangular piece of aluminum has a perimeter of 62 inches. The length is 9 inches longer than the width. Find the width.
A. 11 in.
B. 20 in.
C. 31 in.
D. 29 in.
Answer: A
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Solve.A projection of the annual growth rate (in %) of the number of users of a certain electronic compass is 
, where t is the number of years after 2000. Sketch the graph of this function from 2000 to 2010. p% growth rate
t years after 2000
A. p% growth rate
t years after 2000
B. p% growth rate
t years after 2000
C. p% growth rate
t years after 2000
D. p% growth rate
t years after 2000
True or false?A person who scored at the first quartile in a test scored higher than 375 people if 500 people took the test.
A. True B. False
Rewrite the quadratic equation in the form ax2 + bx + c = 0, then identify a, b, and c. (2x - 8)(x) = 5
A. a = 2, b = -8, c = 5 B. a = 2, b = -8, c = -5 C. a = 2, b = 8, c = 5 D. a = -2, b = -8, c = -5
Classify each angle as acute, right, obtuse, or straight.
A. Straight B. Acute C. Obtuse D. Right