+0

# Help!

0
95
2
+14

$$\sqrt{0.64}-\sqrt[3]{-0.008}+\sqrt[4]{\frac{4}{20.25}}+\sqrt[5]{16\div\frac{1}{2}}$$

This is what I have so far:

sqrt(0.64)=0.8

cbrt(-0.008)=-0.2

frrt(4/20.25)=sqrt(2)

firt(32)=2

0.8-(-0.2)+sqrt(2)+2=

3+sqrt(2)

But apparently that is the wrong answer

What have I done wrong

Jun 16, 2020

#1
+1

Check the. Fret 4/20.25.      Is that not 2/3 ?

Jun 16, 2020
#2
+21953
0

When you are finding the fourth root of ( 4 / 20.25 ) --

the fourth root is the square root of the square root , so:

fourth root of ( 4 / 20.25 )  =  sqrt( sqrt( 4/20.25) ) =  sqrt( 4/9 )  =  2/3

because the sqrt( 4/20.25 )  =  2/4.5  or  4/9

No problems with the rest of the problem ...

Jun 16, 2020