3^(2x)/3^y=3^-4
3^x/3^y=3 1/3^y=3/3^x
3^x-3^(-5) x=-5
3^(-10-y)=3^(-4)
-10-y=-4
y=-6
3^x*9^x<=81</p>
(27)^x<=27^(4/3)</p>
x<=4/3</p>
2^(-2x)*2^(-3x)>=2^5
2^(-5x)>=2^5
-5x>=5
x<=-1</p>
(5/8)^(3x-1)<(64/25)^2</p>
(5/8)^(3x-1)<(5/8)^-4</p>
3x-1>-4
3x>-3
x>-1
(0,4)^(-x-4)>=(0,4)^(2x-6)
-x-4<=2x-6</p>
2<=3x</p>
x>=2/3