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