Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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The formula for an exponential function is 
, where t is measured in months. Then the monthly percentage growth rate for y is
??
A. 1.08% B. 8% C. 0.08% D. 8.02%
Mathematics
Simplify the expression.j11
A. j B. 1 C. -1 D. -j
Mathematics
Find the measure of the dihedral angle indicated.The figure shown is a right prism whose bases are regular hexagons. Find the measure of the dihedral angle between each lateral face and a base.
A. 135° B. 60° C. 90° D. 120°
Mathematics
Solve.
= 3
A. 20, 50 B. 50 C. 20 D. 20, 50, 0
Mathematics