I would like help and would like to know how you did it!

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

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