Find the perimeter. Use 3.14 for ? when needed.
A. 20.56 cm
B. 6.28 cm
C. 12.56 cm
D. 16.56 cm
Answer: C
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Simplify the algebraic expression by combining similar terms.3.8x - 7.2y - 6.5x + 14.1y
A. -2.7x + 6.5y B. -2.7x + 7.2y C. -2.8x + 6.9y D. -2.9x + 6.9y E. -2.7x + 6.9y
Solve and check. Identify any extraneous solutions.
= 
A. - 
, -2
B. 
, 2
C. - 
, (-2 is extraneous)
D. 
, (2 is extraneous)
Solve the equation.
= 2
A. {2}
B. 
C. {4}
D. ?
Solve the problem.Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 774. Find a linear function, S(t), which fits this data, and which expresses score as a function of time. Use this function to predict an average score for persons taking a 49-hour review course. Round your answer to the tenths place.
A. 685.9 B. 697.4 C. 707.2 D. 693.2