Answer:
Step-by-step explanation:
let the length of rectangle=l units
width=9
p=2(l+9)
area=9l
9l=2(l+9)
9l=2l+18
7l=18
l=18/7 units
Answer:
<em>The other two related equations are:
and
</em>
Step-by-step explanation:
The formula that relates the quantities temperature in Celsius (C) and temperature in kelvins (K) is given by: 
First we can add 273.15 to both sides of the equation. So, we will get.....

Now, we can also subtract K from both sides of the original equation. So, we will get..........

So, the other two related equations are:
and 
Yes it is 30° because they are vertical angles
Answer:
9/21
Step-by-step explanation:
9/21 as a fraction is equal to 3/7
9/21 has a common factor of 3, allowing it to simplify down to 3/7