Answer:25
Step-by-step explanation:12+13=15
Answer: 7,-7
Step-by-step explanation: 7 squared is 7 times 7 which equals 49
-7 times -7 is also 49 bc the negatives cancel each other out
Answer: 5x-10y=90
Step-by-step explanation:
3(y+9)
plz plz mark brainliest if it helps