A culture is tested for bacteria and has 2.1 million bacteria. The culture is tested every 5 minutes and each time it is tested there are 1.5 times more bacteria. How many bacteria in millions will there be in the culture after 20 minutes?

Round to the nearest hundredth.

3.15
7.09
10.63
29.17

Which expressions are equivalent to -6 + 3m

Ineed to know the answer to this algebra question.

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?