Antonio measures items in his pocket he knows there are 50 millimeters in 5 centimeters his key chain is 3.5 centimeters long his libairy card is 80 millimetes long

8 Centimetre

Step-by-step explanation: you can do 80÷?=10  or you can do 80÷10=?

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

i think the answer is c sorry if it's wrong