Use a trigonometric substitution to evaluate the integral.
A. 
ln 
+ C
B. 
tan-1 
+ C
C. 
sin-1 
+ C
D. tan-1 
+ C
Answer: D
Mathematics
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Find the reference angle for the given angle.42°
A. 42° B. 132° C. 48° D. 138°
Mathematics
Graph the function.f(x) = 
A. 
B. 
C. 
D. 
Mathematics
Solve.When making a telephone call using a calling card, a call lasting 5 minutes cost $1.70. A call lasting 14 minutes cost $3.95. Let y be the cost of making a call lasting x minutes using a calling card. Write a linear equation that models the cost of a making a call lasting x minutes.
A. y = 4x - 
B. y = -0.25x + 2.95
C. y = 0.25x - 10.05
D. y = 0.25x + 0.45
Mathematics
Simplify the complex fraction.
A. 
B. 
C. 
D. 
Mathematics