Answer:
<em>x</em> = 45 points
Round 3 : 45 points
Step-by-step explanation:
<u>Starting Information:</u>
100 points = 3 rounds
Round 1 : 30 points
Round 2 : 25 points
Round 3 : <em>x</em>
<u>Subtraction:</u>
To find <em>x </em>we need to subtract 30 and 25 from 100
100 - 25 - 30 = <em>x</em> points
<em>Combine -30 and -25 into -55</em>
100 - 55 = <em>x</em>
100 - 55 = 45
In round 3 he scored 45 points
<u>Addition:</u>
To find <em>x</em> we need to add 30 + 25 + <em>x </em>and get a sum of 100
25 + 30 + <em>x </em> = 100
<em>Combine 25 and 30</em>
55 + <em>x</em> = 100
<em>Subtract 55 from each side</em>
<em>x </em>= 45
Here are the 2 expressions I used:
25 + 30 + <em>x</em> = 100
100 - 25 - 30 = <em>x</em>
Note:
My work is not number assigned but hopefully you can understand it :)