Let x be an n-vector and define y as the nonnegative vector (i. e., the vector with nonnegative entries) closest to x. give an expression for the elements of y. show that the vector z = y − x is also nonnegative and that z t y = 0.

dude   i don't even know. i've been trying for hours.

step-by-step explanation:

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,