Using a calculator, evaluate the trigonometric functions. Round to four significant digits.cos 689°

A. -0.5150
B. 0.9998
C. 0.4848
D. 0.8572

Answer: D

Mathematics

You might also like to view...

Assuming that the equations define x and y implicitly as differentiable functions   find the slope of the curve   at the given value of t.2tx + 4t2 = 4, 2y - t2 - t = 0, t = 1

A. - 
B. - 6
C.
D.

View
Mathematics

Simplify.

A. 7k7q8 
B. 7q4
C. 7k3q4 
D. 7k3q4 

View
Mathematics

Solve the system of equations.2x + y = -62x - z = 6y + z = -12

A.
B.
C.
D.

View
Mathematics

Solve the problem.Total profit P is defined as total revenue R minus total cost C, and is given by the function  Find the total profit P(x) if  and 

A. P(x) = 0.3x2 + 210x - 8000 B. P(x) = 0.7x2 + 210x + 8000 C. P(x) = -0.7x2 - 210x - 8000 D. P(x) = -0.7x2 + 210x - 8000

View
Mathematics