Solve the equation. Give an exact solution.log5(x + 7) + log5(x - 7) = 1
A. 
B. 3
C. 5
D. 54
Answer: B
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Solve the problem.A building has an entry with the shape of a parabolic arch 78 ft high and 40 ft wide at the base. Find an equation for the parabola if the vertex is put at the origin of the coordinate system.A = 78 ftB = 40 ft
A. x2 = -5.1y B. y2 = -5.1x C. y2 = -20.5x D. x2 = -20.5y
Solve the problem.The surface of a snow-covered mountainside can be modeled by the function f(x,y) = e-((x - 0.5)2 + (y - 0.7)2),where x and y are coordinates in the horizontal plane (xy-plane). Find a unit vector that indicates the direction an avalanche will move initially if it begins at the point 
. Assume that the avalanche moves along the path of steepest descent.
A. u = 
B. u = 
C. u = 
D. u = 
Determine if the given set of whole numbers is closed under multiplication.{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, . . . } (that is, the whole numbers except for 12)
A. Not closed B. Closed
Graph the function.f(x) = 
A. 
B. 
C. 
D. 