Which pair of numbers is relatively prime?
a) 7 and 21
b) 4 and 15
c) 6 and 9
d) 9 and 27

54

step-by-step explanation:

6x9

i would need to see the dot plot : )

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