$462
3/5 of 35 gallons = 21 gallons
21 gallons x $22 = $462
Answer:
Sadie's error is " she made error in step 2
where
"
Because she made error in splitting the powers to simplify the square root
<h3>Therefore the correct answer for Sadie's expression is
where 
</h3>
Step-by-step explanation:
Given that " Sadie simplified the expression StartRoot 54 a Superscript 7 b cubed EndRoot, where a greater-than-or-equal-to 0, "
It can be written as
where 
The given expression is
where 
To find Sadie's error and explain the correct answer :
Sadie's steps are
where 


<h3>

where

</h3><h3><u>Now corrected steps are</u></h3>
where 
(by using the identity 
(by using the identity
)

Therefore
where 
<h3>The correct answer is
where 
</h3>
Sadie's error is " she made error in step 2
" where 
Because she made error in splitting the powers to simplify the square root
<h3>Therefore the correct answer for Sadie's expression is
where 
</h3>
Answer: 
<u>Step-by-step explanation:</u>
Pythagorean Theorem is: a² + b² = c² , <em>where "c" is the hypotenuse</em>
<em />

Note: 4² + (8√2)² = hypotenuse² → hypotenuse = 12

Note: 12² + opposite² = 20² → opposite = 16

Note: adjacent² + 5² = 6² → adjacent = √11

Note: adjacent² + 7² = (13√2)² → adjacent = 17