If this is algebra, then you want to isolate the t. you need to subtract 1800 on both sides so then the expression would be 16t2= -1800. now you want to divide 16. t2= -112.5 then divide by 2 t= -56.25
2x=360/4
2x=90
divide by 2 on each side
x=45
<span><span>Perpendicular means "at right angles"</span></span>
