Answer:
A.
Step-by-step explanation:
It's the first one. The angles are supplementary not complementary.
Answer:
=m2+6mn+9n2
Step-by-step explanation:
=(m+3n)(m+3n)
=(m)(m)+(m)(3n)+(3n)(m)+(3n)(3n)
=m2+3mn+3mn+9n2
Answer: 15
Step-by-step explanation: You do 60/4 to get the answer.