Select all the fractions that are equal to -9/16

a.-3/4
b.9/-16
c.9/16
d.3/4
e.-9/16
f.3/-4

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