Well first you HAVE to use properties so that means PEMDAS.
P stands for <span>parenthesis, E stands for exponents, M for multiplication, D for division, A for addition, S for subtraction
So as you can see you have 2 properties in the expression E and A properties. E will be done first becuz the letter E comes before A in PEMDAS (13+6) equals 19 then you add 4.
The tangent function gives the ratio of vertical to horizontal distance in this case. .. vertical distance = (horizontal distance)*tan(angle of depression) .. = (40 m)*tan(50°) .. vertical distance ≈ 47.7 m
