Express the sum or difference as a product.cos 10x - cos 4x
A. -2 sin 7x sin 3x
B. -2 cos 7x sin 3x
C. 2 cos 7x cos 3x
D. 2 cos 3x
Answer: A
Mathematics
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Find 
by using the Chain Rule. Express your final answer in w = ln (x + y) + ex; x = st, y = est
A. s
B. s
C. s
D. st
Mathematics
Determine whether the equation is a linear equation in two variables.x - 9y = 2
A. yes B. no
Mathematics
Solve the problem.A punch recipe calls for 9 gallons of juice. How many liters is that? Round to the nearest tenth of a liter. 
A. 34 L B. 2.3 L C. 8.6 L D. 9.5 L
Mathematics
Solve the inequality and graph the solution set.-7x + 4 > -8x + 15
A. {x|x < 19} or (-?, 19)
B. {x|x > 19} or (19, ?)
C. {x|x< 11} or (-?, 11)
D. {x|x > 11} or (11, ?)
Mathematics