One of the eight students in a certain class is a transfer student. To find the transfer student, Alex wants to randomly select three students and then question them if they are in fact the transfer student. Let T be the number of transfer students among his three choices. Compute E(T) and Var(T).

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

What multiplys to be 1 but adds up to be 4

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 > ?