Old Navy has a sale on $15 shirts: buy 3 and get 40% off. How much would 3
shirts cost on sale?

you can't solve x because it is 2 linear equation and you only have one equation

-22

times both sides by 2, times () by 8, add alile terms, move terms, add alike and caculate divide both sides by 3

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft