Dario was scuba diving at an elevation of −20 feet and then descended 20 feet more. Dario and another person scuba diving. The other person is diving at negative thirty feet.

A number line from negative fifty to fifty by tens is shown.

After the descent, what was his elevation in relation to another diver at an elevation of −30 feet. If you help me on this it would be a big help :)

Which inequality has a dashed boundary line when graphed ?

Write the standard form of an equation with (see picture below)

The biologist has a second culture to examine. she knows that the population of the culture doubles every 15 minutes. after 1 hour and 15 minutes, her assistant found that 80,000 bacteria were present. a) what was the size of the initial population? b) predict the size of the culture at t=3 hours. what was the size of the population at 40 minutes? explain and justify your answers. c) create a graph of the population as a function of time. find an equation that can be used to predict the size of the population at any time t. d) examine the rate at which the bacteria culture is growing. how fast is the culture growing after 1 hour? after 1.5 hours? after 2 hours? use a time interval of h = 0.01 hours to estimate these rates. interpret these rates in terms of the context of the problem situation. how do these three rates compare?