Which piecewise relation defines a function? x² x <-
O y = 0-25x34
|-x² xZ4
x² XS-2
Oy= 4, -2 |x? +1, x22
(-3x, X<-2
Oy= 3. OSX<4
2x, x24
y =
(-3x, XS-4
3. -5 2x x>1
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Afair die is cast four times. calculate the probability of obtaining exactly two 6's round to the nearest tenth of a percent

I've been working on this for a few days and i just don't understand, it's due in a few hours. you. the direction of a vector is defined as the angle of the vector in relation to a horizontal line. as a standard, this angle is measured counterclockwise from the positive x-axis. the direction or angle of v in the diagram is α. part a: how can you use trigonometric ratios to calculate the direction α of a general vector v = < x, y> similar to the diagram? part b suppose that vector v lies in quadrant ii, quadrant iii, or quadrant iv. how can you use trigonometric ratios to calculate the direction (i. e., angle) of the vector in each of these quadrants with respect to the positive x-axis? the angle between the vector and the positive x-axis will be greater than 90 degrees in each case. part c now try a numerical problem. what is the direction of the vector w = < -1, 6 > ?

At store a, erasers are sold individually. the cost y of x erasers is represented by the equation y=0.75x. the costs of erasers at store b are shown in the graph.