Find all the critical numbers of the function.
g(x) = 7x + sin(7x)
b. 
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Find the magnitude and direction angle (to the nearest tenth) for each vector. Give the measure of the direction angle as an angle in [0,360°].
A. 24; 135°
B. 24
; 45°
C. 48; 315°
D. 24; 315°
Factor the expression completely.21t4 - 91t3 - 70t2
A. 7t2(3t + 2)(t - 5) B. (21t3 + 14t)(t - 5) C. 7t2(3t - 2)(t + 5) D. t2(3t + 2)(7t - 35)
Solve the problem.Find the volume of the rectangular solid with the following dimensions.Length = 9 inches, width = 7 inches, height = 6 inches
A. 63 B. 69 C. 378 D. 42
An experienced welder makes 
as many welds as a beginning welder. If an experienced welder and a beginning welder complete 210 welds, how many were from the experienced welder and how many from the beginning welder?
A. A beginning welder makes 150, an experienced welder makes 60. B. A beginning welder makes 90, an experienced welder makes 120. C. A beginning welder makes 60, an experienced welder makes 150. D. A beginning welder makes 50, an experienced welder makes 160. E. A beginning welder makes 70, an experienced welder makes 140.