Late xandy be i. i.d n(0,1), and let's be a random sign (1 or−1, with equal probabilities) independent of (x, y).
(a) determine whether or not (x, y,x+y) is multivariate normal.
(b) determine whether or not (x, y,sx+sy) is multivariate normal.
(c) determine whether or not (sx, sy) is multivariate normal.

Scarlet bought three pairs of sunglasses and two shirts for $81 and paula bought one pair of sunglasses and five shirts for $105 what is the cost of one pair of sunglasses and one shirt?

Triangle xyz, with vertices x(-2, 0), y(-2, -1), and z(-5, -2), undergoes a transformation to form triangle x? y? z? , with vertices x? (4, -2), y? (4, -3), and z? (1, -4). the type of transformation that triangle xyz undergoes is a . triangle x? y? z? then undergoes a transformation to form triangle x? y? z? , with vertices x? (4, 2), y? (4, 3), and z? (1, 4). the type of transformation that triangle x? y? z? undergoes is a .

When a valve is open 281 gallons of water go through it in one hour the number of gallons that would go through in 94 hours is