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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Graph the function as a solid curve and its inverse as a dashed curve.f(x) = 
x + 5
A. 
B. 
C. 
D. 
Mathematics
Solve the proportion. Write the solution in decimal form when applicable.
= 
A. 26 B. 68 C. 21.7 D. 21
Mathematics
?Solve the differential equation to find velocity v as a function of time ?t if 
when 
. The differential equation models the motion of two people on a toboggan after consideration of the forces of gravity, friction, and air resistance.
?
?
A. ?
B. ?
C. ?
D. ?
E. ?
Mathematics
Solve.Last year the hatch-back model of a new car cost $17,779. This year's model costs $18,813. How much more does this year's model cost?
A. $36,592 B. $934 C. $35,592 D. $1034
Mathematics