Enrich Your Math Word Power

For each mathematical term, choose the correct meaning.


1	composition of f and g
		A)	the function f º g where ( f º g)(x) = f (g(x))
		B)	the function f º g where ( f º g)(x) = g(f(x))
		C)	the function f · g where ( f · g)(x) = f (x) · g(x)
		D)	a diagram showing f and g


2	sum of f and g
		A)	the function f · g where (f · g)(x) = f(x) · g(x)
		B)	the function f + g where (f + g)(x) = f(x) + g(x)
		C)	the function f º g where (f º g)(x) = g(f(x))
		D)	the function obtained by adding the domains of f and g


3	inverse of the function f
		A)	a function with the same ordered pairs as f
		B)	the opposite of the function f
		C)	the function 1/f
		D)	a function in which the ordered pairs of f are reversed


4	one-to-one function
		A)	a constant function
		B)	a function that pairs 1 with 1
		C)	a function in which no two ordered pairs have the same first coordinate and different second coordinates
		D)	a function in which no two ordered pairs have the same second coordinate and different first coordinates


5	vertical-line test
		A)	a visual method for determining whether a graph is a graph of a function
		B)	a visual method for determining whether a function is one-to-one
		C)	using a vertical line to check a graph
		D)	a test on vertical lines


6	horizontal-line test
		A)	a test that horizontal lines must pass
		B)	a visual method for determining whether a function is one-to-one
		C)	a graph that does not cross the x-axis
		D)	a visual method for determining whether a graph is a graph of a function


7	proportionality constant
		A)	a direct variation
		B)	a constant proportion
		C)	a ratio that is constant
		D)	the constant k in y = kx


8	y varies directly as x
		A)	y = kx² where k is a constant
		B)	y = mx + b where m and b are nonzero constants
		C)	y = kx where k is a nonzero constant
		D)	y = k/x where k is a nonzero constant


9	y varies inversely as x
		A)	y = x/k where k is a nonzero constant
		B)	y = -x
		C)	y = kx where k is a nonzero constant
		D)	y = k/x where k is a nonzero constant


10	zero of a function
		A)	a number a such that f (0) = a
		B)	a number a such that f (a) = 0
		C)	the value of f (0)
		D)	the number zero


11	reflection in the x-axis
		A)	the graph of y = f(-x)
		B)	the graph of y = -f(x)
		C)	the graph of y = -f(-x)
		D)	the line of symmetry


12	upward translation
		A)	the graph of y = f(x) + c for c > 0
		B)	the graph of y = f(x + c) for c < 0
		C)	the graph of y = f(x - c) for c > 0
		D)	the graph of y = f(x) + c for c < 0


13	translation to the left
		A)	the graph of y = f(x) - c for c > 0
		B)	the graph of y = f(x) + c for c > 0
		C)	the graph of y = f(x - c) for c > 0
		D)	the graph of y = f(x + c) for c > 0

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