Simplify.
A. x - 5
B. 
C. x + 5
D. 
Answer: B
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Write the number in standard form.2(cos 270° + i sin 270°)
A. -2i B. -i C. 2i D. -2
Solve the problem.The formula for converting Fahrenheit temperature, F, to Celsius temperature, C, is 
If Celsius temperature ranges from -15° to 45°, inclusive, what is the range for the Fahrenheit temperature?
A. [-19°F, -13°F] B. [5°F, 113°F] C. (5°F, 113°F) D. (-19°F, -13°F)
Fill in the blank with one of the symbols =, <, or > to produce a true statement.12 ? 6
A. = B. > C. <
Solve the problem. Round to an appropriate number of significant digits.In one study the maximum heart rates of conditioned athletes were examined. A group of athletes was exercised to exhaustion. Let x represent an athlete's heart rate five seconds after stopping exercise and y represent an athlete's heart rate ten seconds after stopping exercise. It was found that the maximum heart rate H for these athletes satisfied the following two equations. H = 0.491x + 0.468y + 11.2 H = -0.981x + 1.872y + 26.4If an athlete had maximum heart rate H = 155, determine the value of x graphically.
A. x = 151.9 B. x = 152.2 C. x = 151.1 D. x = 151.6