Solve.The line graph shows the target heart rate, in beats per minute, of people of various ages when performing an exercise stress test. Target Heart Rates for Stress Tests 
AgeUse the line graph to estimate the target heart rate for a 50-year-old taking the test.
A. 116 beats per minute
B. 111 beats per minute
C. 99 beats per minute
D. 95 beats per minute
Answer: C
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Identify the numerator and the denominator of the fraction.
A. numerator: 
; denominator: 1
B. numerator: 17; denominator: 6
C. numerator: 23; denominator: 1
D. numerator: 6; denominator: 17
Find the vertex, focus, and directrix of the parabola. Graph the equation.x2 - 8x = 4y - 32
A. vertex: (4, 4)
focus: (4, 5)
directrix: y = 3
B. vertex: (4, 4)
focus: (4, 3)
directrix: y = 5
C. vertex: (4, 4)
focus: (3, 4)
directrix: x = 5
D. vertex: (4, 4)
focus: (5, 4)
directrix: x = 3
Evaluate the expression for the given values.
x = 8, y = 2
A. 
B. 
C. 
D. 
Use the unit circle to find the indicated quantities.
tan 5?; cot 5?
A. 0; undefined B. -1; -1 C. Undefined; 0 D. 0; 0