Find the domain of the function.
A. {x|x ? 0}
B. {0}
C. all real numbers
D. {x|x ? 0}
Answer: C
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Find the intersection.x + y + z = -6, x + y = -8
A. x = -t, y = -8 + t, z = 2 B. x = -t, y = -8 + t, z = -2 C. x = t, y = -8 - t, z = 2 D. x = -1, y = 1 - 8t, z = 2t
Solve the problem.Jill is 
away from Joe. Both begin to walk toward each other at the same time. Jill walks at 
per hour. If they meet in 2 hours, how fast is Joe walking?
A. 4.5 km per hour B. 3.5 km per hour C. 2 km per hour D. 2.5 km per hour
Solve the problem.An artifact is discovered at a certain site. If it has 56% of the carbon-14 it originally contained, what is the approximate age of the artifact? (carbon-14 decays at the rate of 0.012% annually.)
A. 3667 yr B. 4667 yr C. 2098 yr D. 4832 yr
Find the axis of symmetry of the parabola defined by the given quadratic function.y + 9 = (x + 3)2
A. x = 3 B. y = -9 C. x = - 3 D. y = 9