Use the appropriate sum or difference identity to write the given expression as a function of x alone.sin 
A. sin x
B. -cos x
C. -sin x
D. cos x
Answer: B
Mathematics
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Solve the problem.Let u = 2i + 9j, v = 2i + 3j, and w = i - j. Write u = u1 + u2 where u1 is parallel to v and u2 is parallel to w.
A. u1 = 0.4545 v u2 = -0.4167w B. u1 = 2.200 v u2 = -2.400w C. u1 = 3v u2 = 2w D. u1 = 4v u2 = -27w
Mathematics
Write the rate as a unit rate.There are 1792 people in 40 buses.
A. 448 people/bus B. 0.022 person/bus C. 44.8 people/bus D. 1752 people/bus
Mathematics
Factor by grouping.xy + 10x - 4y - 40
A. (y - 10)(x + 4) B. (x + 10)(y - 4) C. (y + 10)(x - 4) D. (x - 10)(y + 4)
Mathematics
Find the perimeter or circumference.A circle whose radius measures 12 ft (Use 3.14 for ? .)
A. 144 ft B. 452.16 ft C. 75.36 ft D. 37.68 ft
Mathematics