Use the information given about the angle ?, 0 ? ? ? 2?, to find the exact value of the indicated trigonometric function.cos ? = - , ? < ? < Find cos .

A. - 
B.
C.
D. - 


Answer: A

Mathematics

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Solve the problem.One Internet service provider has the following rate schedule for high-speed Internet service:Monthly service charge$18.001st 50 hours of usefreeNext 50 hours of use$0.25/hourOver 100 hours of use$1.00/hourWhat is the charge for 50 hours of high-speed Internet use in one month?What is the charge for 75 hours of high-speed Internet use in one month?What is the charge for 135 hours of high-speed Internet use in one month?

Fill in the blank(s) with the appropriate word(s).

Mathematics

Find a rectangular equation for the plane curve defined by the parametric equations.x = 5 tan t, y = 2 sec t; 0 ? t ? 2?

A.  +  = 1; for x in -? < x < ?
B. y = 2; for x in -? < x < ?
C. y = x2 - 9; for x in -3 ? x ? 3
D.  -  = 1; for x in -? < x < ?

Mathematics

Use Euler's method to approximate the indicated function value to three decimal places using  = ; y(0) = 2; find y(0.3)

A. 2.015 B. 2.005 C. 2.030 D. 2.024

Mathematics

?Solve the system of linear equations    using an inverse matrix.

A. ?
B. ?
C. ?
D. ?
E. ?

Mathematics