Determine which postulate or theorem can be used to prove that ABC= DCB.
A. SAS
B. ASA
C. AAS
D. SSS

Consider 6x2 + 6x + 1. which term immediately tells you that this expression is not a perfect square trinomial? justify your answer

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels