Use the basic identities to simplify the expression.(1 - cos ?)(1 + cos ?) - sin2 ?
A. sin2 ?
B. 2
C. 1
D. 0
Answer: D
Mathematics
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Solve the problem.A private shipping company will accept a box for domestic shipment only if the sum of its length and girth (distance around) does not exceed 90 in. Suppose you want to mail a box with square sides so that its dimensions are 
and it's girth is 
What dimensions will give the box its largest volume?
A. 30 in. × 15 in. × 30 in. B. 20 in. × 20 in. × 15 in. C. 15 in. × 15 in. × 75 in. D. 15 in. × 15 in. × 30 in.
Mathematics
Evaluate the algebraic expression for the given value(s) of the variable(s).
; x = 3
A. 
B. - 
C. 
D. - 1
Mathematics
Solve the equation.9x - (4x - 1) = 2
A. 
B. 
C. 
D. 
Mathematics
Find the vertex of the parabola.f(x) = - 
x2 + 9x - 5
A. 
B. (-27, -491)
C. 
D. (27, -5)
Mathematics