Select all the expressions that are equivalent to 3^12 • 7^9.

Stefano accidentally dropped his sunglasses off the edge of a canyon as he was looking down. the height, h(t), in meters (as it relates to sea level), of the sunglasses after t seconds, is shown in the table. during its descent, the pair of sunglasses passed by a climber in the canyon 6 seconds after stefano dropped them. to the nearest meter, what is difference in elevation between stefano and the climber? 166 meters 176 meters 230 meters 240 meters its b.176 i took the test 166 is wrong and 176 is correct

We just started the introduction into circles and i have no idea how to do this.

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?