You just change the denominator in too the same denominator
First you divide 380 by 100 to get what 1% is, (3.8) and then you multiply by 18 to give you 18%. The answer is 68.4, so add that to 380 and you'll have the final answer of 448.4.
Well I'm pretty sure the answer is 6 and if u look at the far left there is 4 and at the right there is 10 which you r trying to equal so u subtract those to and I get 6. Hope this helped not good at explaining things so sorry.
3x - 13 = 8
<em><u>Add 13 to both sides.</u></em>
3x = 21
<em><u>Divide both sides by 3.</u></em>
x = 7
Now that we have the value of x we can solve x - 4.
7 - 4 = 3
The value of x is 7, and the answer to the second expression is 3.