I found this online, hope it helps
Just follow these steps:
Multiply normally, ignoring the decimal points.
Then put the decimal point in the answer - it will have as many decimal places as the two original numbers combined.
-12+8x+2x=2x-8
10x-12=2x-8
8x=4
x=1/2
C
It doesn’t represent a function, since in a function- the x values can’t repeat,
In (-13,4) and (-13,9) the x values are the same.
<h3>The true statement about circumference of a circle is: circumference is found by multiplying Pi by the diameter</h3>
<em><u>Solution:</u></em>
<em><u>The circumference of a circle is given as:</u></em>

Where,
"r" is the radius of circle
We know that,

<em><u>Thus the circumference can also written as:</u></em>

Thus, the circumference is found by multiplying Pi by the diameter is correct statement