A)0,2^(x)<=1/25 b)(1,5)^(x)<2,25 c) 4^(5-2x)<=0,25 d) 0,4^(2x+1)>0,16

Question

A)0,2^(x)<=1/25<br> b)(1,5)^(x)<2,25<br> c) 4^(5-2x)<=0,25<br> d) 0,4^(2x+1)>0,16

Answer 1

A) 0.2^(x)<=1/25<br>0.2^x<=0.2^(1/2)<br>x>=1/2
b) 1.5^x<2,25<br>1,5^x<1,5^2<br>x<2<br>c)4^(5-2x)<=0.25<br>4^(5-2x)<=4^(-1)<br>5-2x<=-1<br>x>=3
d) 0.4^(2x+1)>0.16
0.4^(2x+1)>0.4^2
2x+1<2<br>x<0.5<br>