I think you have to email them or something lol
Cos A will be 60°.
Because When, cos is 1/2 then theta or angle is degree 60°
He had $12.50 left because you do
1.25 + 5= 6.25 and because he spent half earlier you would multiply by two to get 12.5
x,x+2,x+4 the answer here is how i got it =x+x+2+x+4=180
=3x=174
=x=58
x=58
x+2=58+2=60
x+4=58+4=62