Find the estimated size of the population

1. In a mark-recapture study to estimate the size of a rabbit population, researchers catch and mark 290 individuals. Two days later, they again capture the same number of rabbits and find that 40% of the individuals are marked. Assuming that there have been no births, deaths, or migrations, what is the estimated size of the population?
2. A researcher samples a 100 m2 patch of forest with five quadrats of 1×1 m each. In quadrats A, B, C, D, and E, respectively, 13, 20, 17, 23, and 30, individuals of species X are found. What is the best estimate for the total number of species X in the patch of forest?

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