Answer:x=13.42
Step-by-step explanation:
from Pythagoras principle we have
x^2=√(18^2-12^2)
x^2=√(18x18-12x12)
x^2=√(324-144)
x^2=√(180)
Take the square root of both sides
x=13.42
1/4=0.25
0.25(3s-14)=4
0.75s-3.5=4
0.75s=7.5
s=10
well, I think it's 60 because it prime factors are 2, 3, 5.