Use the product-to-sum formulas to rewrite the expression as the sum or difference of two functions.sin 44° cos 18°
A. 
sin26° - 
sin 62°
B. 
cos 26° - 
cos 62°
C. 
cos 62° + 
cos 26°
D. 
sin 62° + 
sin 26°
Answer: D
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Find the equation of the parabola satisfying the given conditions. The vertex is at the origin.Focus (-7, 0)
A. y = - 
x2
B. x2 = -28y
C. y2 = -28x
D. y = -28x2
Find the center (h, k) and the radius r of the circle.2x2 + 2y2 - 8x + 16y + 22 = 0
A. (h, k) = (-2, 4); r = 9 B. (h, k) = (2, -4); r = 3 C. (h, k) = (-2, 4); r = 3 D. (h, k) = (2, -4); r = 9
Write the solution set to the inequality in interval notation.x ? 18
A. (18, ?) B. (-?, 18] C. [18, ?) D. (-?, 18)
A plane with a tail wind makes its 987-mile flight in 3 hours. The return flight against the wind takes a half hour longer. What is the wind speed? ?
A. 21.5 mph B. 282 mph C. 26 mph D. 23.5 mph E. 305.5 mph