Write the expression as a pure imaginary number.- 
A. -2
B. 2
C. 2
i
D. -2
i
Answer: D
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Solve the problem.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 = 0.491 x + 0.468 y + 11.2 H = -0.981 x + 1.872y + 26.4If an athlete had a maximum heart rate of H = 166, determine the value of x graphically to the tenths place.
A. x = 163.2 B. x = 163.5 C. x = 162.9 D. x = 162.4
Simplify.(-2x2)(x5) - (x3)(-8x4)
A. 6x7 B. -10x7 C. 10x7 D. -2x10 - (-8x12)
Supply the missing numbers. Round any decimal to the nearest thousandth and percent to the nearest tenth of a percent if necessary.fractiondecimalpercent?90%
A. 
; 0.9
B. 
; 0.9
C. 
; 9
D. 
; 9
Find the 20th term and sum of the first 20 terms of the geometric progression - 3, 3, - 3, 3,...
a80 = __________ S80 = __________