Answer:
10
Step-by-step explanation:
15-5=10, simple.
from what I understand this should be the answer:
<u>x</u>. <u>y</u>
<u>12</u><u>. </u><u> </u><u> </u><u> </u><u> </u><u> </u><u>7</u><u>. </u><u> </u><u>Because</u><u> </u><u>y</u><u>=</u><u>x-5</u><u> </u><u>and</u><u> </u><u>7</u><u>=</u><u>12-5</u>
<u>30</u><u>. </u><u> </u><u> </u><u> </u><u>25</u><u> </u><u>Because</u><u> </u><u>25</u><u>=</u><u>30-5</u>
<u>15</u><u>. </u><u> </u><u> </u><u> </u><u> </u><u> </u><u>10</u><u> </u><u>Because</u><u> </u><u>10</u><u>=</u><u>15-5</u>
1) 180 degrees; straight angle
2) (5x-18)+(4x+45)=108
3) x=17
4) 90 degrees; right angle
5) (3x+6)+(5x+4)=90
6)x=10
Hey I think that it's a cube of sodium or ice
Hope it helps! :)