When electric current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Why?

Suppose a store sells an average of 80 cases of soda per day. assume that each case contains 24 cans of soda and that the store is open 10 hours per day. find the average number of soda that the store sells per hour.

X+y=-4 x-y=2 use elimination with adding and subtraction

If the average of x,y and z is 15 what is their sum