Use the graph to complete the identity.cos 3x cos 5x + sin 3x sin 5x = ?
A. y = sin 2x
B. y = cos 2x
C. y = cos 8x
D. y = sin 8x
Answer: B
Mathematics
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Find the average value of the function over the region.f(r, ?, z) = r over the region bounded by the cylinder r = 6 between the planes z = -8 and z = 8
A. 9 B. 4 C. 6 D. 2304?
Mathematics
Determine whether the ordered pair is a solution of the system.(4, 6) 
A. Yes B. No
Mathematics
Determine if the given set of whole numbers is closed under multiplication.{1, 3, 5, 7, . . . }
A. Closed B. Not closed
Mathematics
Provide an appropriate response.Give two reasons why a business would prefer to calculate stock turnover at retail rather than at cost.
What will be an ideal response?
Mathematics