What is the percent of the area under the density curve where x is less than 4

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

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days