Take a look at this real data collected by a seismograph on May 27, 2020. Each row of the data represents a 15-minute span of time, beginning at 6:00 p. m. 23 lines, mostly straight with small bumps; many large spikes begin in the fourth minute of data on the 14th line and last for about two minutes

Describe the appearance of the data from the seismograph. At approximately what time did the largest earthquake occur?

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.