Roberto and Claudia's high level of responsivity to their baby's persistent crying demonstrates what type of influence on the child's development?
A. genetic
B. environmental
C. maturation
D. social
Answer: B
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Find a general term, (ak), that fits the displayed terms of the given sequence.1, 5, 9, 13, 17
A. 
B. 
C. 
D. 
Complete the identity.
= ?
A. sin2 
B. 
C. cos2 
D. 
Solve the problem.If cos ? = - 
, and 
< ? < ?, then find tan 2?.
A. 
B. 
C. 
D. 
Find the exact value of the expression.cos 
cos 
+ sin 
sin 
A. 
B. 
C. 
D. 1