Guillermo is a professional deep water free diver.

His altitude (in meters relative to sea level),x seconds after diving, is modeled by

g(x)= 1/20x(x-100)

How many seconds after diving will Guillermo reach his lowest altitude?

100 seconds

Step-by-step explanation:

Guillermo's altitude (height) is given as:

His lowest altitude will be when he is at the sea floor, at g(x) = 0.

Hence, the time (x), when g(x) = 0 is:

Multiplying by 20:

Divide both sides by x:

x = 100 secs

He will be at his lowest altitude in 100 seconds.

the circle graph is not a function.

step-by-step explanation:

the graph of the circle is not a function.

because for a graph to be a function, each value of x must give one value of y

in the circle, the values of x for -2< x< 2 each give 2 values of y.

hence this is not a function.