1. which of the following represents a function? x -2 -1 0 -1 -2 y 2 3 4 5 6
x 1 1 0 2 2 y 1 2 3 4 5
x 1 2 3 4 5 y 2 2 3 3 4
x 1 1 1 1 1 y 2 3 4 5 6
2. what is the domain of the function: {(2, 1); (4, 2); (6, 3); (8, 4)}? {1, 2, 3, 4} {1, 2, 3, 4, 6, 8} {2, 4, 6, 8} {6, 8}
3. what is the range of the function: {(2, 1); (4, 2); (6, 3); (8, 4)}? {1, 2, 3, 4} {1, 2, 3, 4, 6, 8} {2, 4, 6, 8} {6, 8}
4. suppose p varies directly with d, and p = 7 when d = 3. what is the value of d when p = 28? 4/3 12 16 140/3
5. given the function t(z) = 7 β z, find t(β4). β11 11 β3 3 6. what is the equation of the graph?
f(x) = β |x| + 2 f(x) = β |x| β 2 f(x) = β |x + 2| f(x) = β |x β 2| 7. the number of calories burned, c, varies directly with the time spent exercising, t. when dennis walks for 4 hours, he burns 800 calories. which of the following equations shows this direct linear variation? c = t c = 800t c = 4t c = 200t