Use the information given about the angle ?, 0 ? ? ? 2?, to find the exact value of the indicated trigonometric function.cos(2?) = 
, 0 < ? < 
Find cos ?.
A. 
B. 
C. 
D. 
Answer: A
Mathematics
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Use the sum-of-the-years'-digits method of depreciation. Round to the nearest dollar.Find the book value at the end of the second year for an air filtration system which cost $6,300, has a life of 5 years, and an estimated scrap value of $630.
A. $3,402 B. $2,520 C. $4,032 D. $2,898
Mathematics
Multiply or divide. Write the answer in lowest terms. 
? 
A. 
B. 
C. 
D. 
Mathematics
Use the quadratic formula to solve the equation. Give both exact and approximate answers.4m2 + 10m + 1 = 0
A. 
; -0.052, -1.198
B. 
; -1.354, -3.646
C. 
; -0.104, -2.396
D. 
; 0.096, -2.596
Mathematics
Combine like terms.- 
x - 
y2 + 
x + 
y2
A. 
x - 
y2 + 
y
B. - 
x - 
y2
C. 
x - 
y2
D. 
x2 - 
y4
Mathematics