Find the angle between the given vectors to the nearest tenth of a degree.a = 
, b = 
A. 68.1°
B. 156.2°
C. 78.1°
D. 166.2°
Answer: B
Mathematics
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Use implicit differentiation to find dy/dx and d2y/dx2.x2 + y2 = 9
A. 
= - 
; 
= - 
B. 
= - 
; 
= - 
C. 
= - 
; 
= - 
D. 
= 
; 
= 
Mathematics
Write the rate as a unit rate.A toy rocket climbs 140 yards in 35 seconds.
A. 4 seconds per yard B. 20 yards per 5 seconds C. 140 yards per 35 seconds D. 4 yards per second
Mathematics
The sequence is defined recursively. Write the first four terms.a1 = -8; an = n - an - 1
A. a1 = -8, a2 = -6, a3 = 9, a4 = -5 B. a1 = -9, a2 = -6, a3 = -8, a4 = -5 C. a1 = -8, a2 = -16, a3 = 8, a4 = -24 D. a1 = -8, a2 = 10, a3 = -7, a4 = 11
Mathematics
Find all square roots of the number.441
A. 23, -23 B. 42, -42 C. 21, -21 D. 22, -22
Mathematics