Add or subtract, as indicated. Assume that all variables represent positive real numbers.3
+ 4 - 9
A. 4 + 12
B. 4 + 6
C. -2
D. 4 - 6
Answer: D
Mathematics
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Sketch the surface z = f(x,y).f(x, y) = 
A. 
B. 
C. 
D. 
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Find all real numbers that satisfy the equation.sin x = -1
A. 
B. 
C. 
D. 
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Solve the problem.From a distance of 43 feet from the base of a building, the angle of elevation to the top of the building is 61°. Estimate the height of the building to the nearest foot.
A. 78 ft B. 38 ft C. 24 ft D. 21 ft
Mathematics
Use the distributive property to rewrite the expression. Simplify if possible.- 
(-9x + 18y)
A. 2x + 4y B. -2x + 4y C. 2x - 4y D. -2x
Mathematics