Geometry Question Help if you can please

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

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?