It is a square, so you know the sides are equal. You also know that 49 is a squared number. so you do 49 square rooted and you get 7. the perimeter is adding all the side lengths. So you take 7 and multiply it by 4 since a square has 4 sides. and u have your perimeter. 28!<span />
To isolate a variable you have to “do something to both sides”. i dont know your equation. but you either have to add, subtract, multiply or divide
Volume = length * width * depth
width = Volume / (length * depth)
width = 7.35 / (4.2 * .5)
width = 3.5 meters
Double Check
Volume = 4.2 *.5 *3.5 =
<span>
<span>
<span>
7.35
</span>
</span>
</span>
cubic meters correct !!
Evaluate 1.80/Y for y= 0.009
We replace 0.009 for y
So fraction becomes 
Now , to simplify the fraction we try to remove the decimal from denominator
0.009 have three digits after the decimal point, so we multiply by 1000 to remove the decimal point. Multiply top and bottom by 1000 to make equivalent fraction.

= 200
Answer is 200