6 math books would be 126
5 English books would be 150
126+150=276
3+p=8
-p -p
3=8-p
-8 -8
-5=-p
swap signs
5=p
No the side lengths of 9,12, and 18 doesn’t form a right triangle. Posted a picture showing all the side length that is a right triangle.
Answer:39
Step-by-step explanation:
90-51=39