Answer: if 13+7+2=20+2 the property of equality is A Subtraction Property of Equality.
Step-by-step explanation:
Cubic polynomial

Binomial

By vertical method of multiplication we get,

Answer: I think its 81 but i'm not that sure.
Step-by-step explanation:
Answer: a = 18
explanation:
2(a + 10) = 56 -> distribute the 2
2a + 20 = 56 -> subtract 20 from both sides
2a = 56 - 20
2a = 36 -> divide both sides by 2
a = 18