#14. If he climbs up 14 from 6 then 14-6=8 feet on the ground, and then he climbs down 11 feet so this is 8 feet on the ground plus 3 underground. The answer is: he is 3 feet under ground.
#15. The error is that he changed the number but not the signs, the numbers must change with their signs.
#16. Part a: -350+275+70-50= -55. Part b: Barrys because 45 is greater than -55
#17. Part a: The important thing here is the magnitude, so absolute value of (-30) is 30, the answer is 3 to 4
Part b: add the entering and subtract the leaving: 30-12= 18+14=32-8=24+18=42-30= 12 the answers is 12 customers.
