blake bought two iced coffees at dutch bros. He originally had $13.50 and now has $9 Write and solve an equation to find out how much each iced coffee cost

Equation: 13.50-2x=9 or 9=13.50-2x

Solve:
13.50-2x=9
-13.50 -13.50
—————————
-2x= -4.50
—— ———
-2. -2

X= $2.25
each coffee costs $2.25

You can check by putting 2.25 into the equation 13.50-2x=9
13.50-2(2.25)=9
13.50-5.50=9
9=9

One unique triangle, because those angles add up to 180, and that's how many degrees there are in one triangle.