4Dr. Emily Carter returned to the fossil site and found a layered deposit. The top layer contains 45 fossilized fern fronds, the middle has twice as many, and the bottom layer has 30 fewer than the sum of the top two layers. If each frond represents one plant, what is the total number of fossil plants across all layers?

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Title: Dr. Emily Carter Discovers Remarkable Fossilized Fern Layers at Ancient Site In a groundbreaking return to a historic fossil site, renowned paleontologist Dr. Emily Carter uncovered a layered deposit revealing an extraordinary concentration of fossilized ferns—providing new insights into prehistoric ecosystems. Her latest fieldwork revealed a striking vertical sequence of fern frond fossils, each preserved with remarkable detail, offering a window into ancient forest life. ### The Fossil Layers: A Detailed Breakdown Dr. Carter’s analysis revealed three distinct layers, each contributing to a total fossil count that reflects a dramatic increase from top to bottom: