Sea level is 0
robert dives 40 ft.....-40
he then rises 23 ft.....-40 + 23 = -17
he then dives 19 ft to meet Sam....-17 - 19 = -36
together they rise 31 ft...-36 + 31 = - 5
they are 5 ft below sea level <==
<span> 1.01 > 1.0009 ????????</span>
Answer:
Vertex: (4,9)
X int: (1,0),(7,0) = x=-1, x=-7
y iny: (0,-7)