If 40% of a radioactive substance remains after 20 years, what is the half-life of the substance?

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

Find the distance from the theater to the library. leave your answer in simplest radical form if necessary. 12 √12 74 √74

Worth 100 points need the answers asap first row -x^2 2x^2 (x/2)^2 x^2 x is less than 2 x is greater than 2 x is less than or equal to 2 x is greater than or equal to 2 second row -5 -5/2 4 5 •2 is less than x& x is less than 4 •2 is less than or equal to x & x is less than or equal to 4 •2 is less than or equal to x& x is less than 4 •2 is less than x& x is less than or equal to 4