Use sum-to-product formulas to rewrite the expression as a product.sin 
+ sin 
A. 2 sin 
cos 
B. 2 cos 
cos 
C. 2 cos 
sin 
D. 2 sin 
sin 
Answer: A
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Multiply. Simplify if possible.
? 
A. 
B. 
C. 
D. 
Determine if the two lines are parallel, perpendicular, coinciding, or only intersecting.2x - 4y = 2y = 
x - 
A. coinciding B. intersecting C. perpendicular D. parallel
Solve the following quadratic application by factoring.If an object is thrown upward with an initial velocity of 
, its height after t sec is given by 
. How high is the object after 0.5 sec? At what time will the object hit the ground? (Hint: The height is 0 on the ground.)
A. The object will be 4 ft high after 0.5 sec.; The object will hit the ground after 1 sec. B. The object will be -12 ft high after 0.5 sec.; The object will hit the ground after 9.5 sec. C. The object will be 0 ft high after 0.5 sec.; The object will hit the ground after 11 sec. D. The object will be 16 ft high after 0.5 sec.; The object will hit the ground after 9.5 sec.
Factor.x(y + 10) + 4(y +10)
A. (xy + 10x) + (4y + 40) B. 10y(x + 4) C. (y + 10)(x + 4) D. 4x(y + 10)