Solve the problem.A cable TV company charges $21 for the basic service plus $5 for each movie channel. Write an equation for the total cost in dollars, y, of subscribing to cable TV, using x movie channels.
A. y = 21x - 5
B. y = 21x + 5
C. y = 5x + 21
D. y = 5x - 21
Answer: C
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Find the domain of the expression.
?
?
A. All real numbers x such that x ? 2 B. All real numbers x such that x ? 2 C. All real numbers x such that x > 2 D. All nonnegative real numbers x such that x < 2 E. All real numbers x such that x ? 2
Determine the measure of an interior angle of the named regular polygon.Decagon
A. 30° B. 150° C. 144° D. 36°
Find the intervals on which the function is continuous.y = 
A. discontinuous only when ? = -1
B. discontinuous only when ? = 
C. continuous everywhere
D. discontinuous only when ? = 1
Determine whether the polynomial is a perfect square trinomial, a difference of squares, or neither.x2 - 4
A. Perfect square trinomial B. Neither C. Difference of squares