Who is fibonacci? what is his sequence and what is the rule for his sequence?

What is the approximate total length of iron edging needed to create the square frame and the two diagonals?

What is the number 321,000,000 in scientific notation? also what is the number? ?

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