Porcentagem, Notação Científica e Divisão - Concursos, Vestibulinhos e ETEC - Professora Angela

Become a member of this channel and get benefits:    / @professoraangelamatematica   Hello everyone!! In this class we have a question involving scientific notation and division. This is another video for people who are preparing for #ETEC and other #Vestibulinhos, as well as #competitions. ETE - 2019/2 - Question 22 It is not known how many plant and animal species there are in the world, but estimates are that scientists have identified only a small fraction (between 1% and 10%) of the species with which we share our planet. However, global biological diversity has been affected by human activities over time and, today, biodiversity loss is a problem. In 1988, English ecologist Norman Myers identified the most threatened areas in the world, which he called hotspots. In 1999, although they represented only 1.4% of the planet's surface area, the 25 identified hotspots were home to 44% of all plant species and 35% of terrestrial vertebrate species. To be considered a hotspot, an area must have at least 1,500 endemic plant species (those found only in that region) and have 30% or less of its original vegetation preserved. Assume that the surface area of ​​planet Earth is 500 million km2. Therefore, it can be estimated that the average size of each hotspot identified in 1999 would be, in km2, (A) 28 × 10^6 (B) 28 × 10^4 (C) 28 × 10^3 (D) 28 × 10^1 (E) 28 × 10^0 BNCC SKILL: EF08MA01 - Perform calculations with powers of integer exponents and apply this knowledge to the representation of numbers in scientific notation. EF08MA04 - Solve and develop problems involving percentage calculations, including the use of technologies. I hope you enjoyed the video and learned from the example. If you did, click like so that more people can view it and learn from it. Thank you and a big hug Professor Angela Mathematics Link to this video:    • Porcentagem, Notação Científica e Divisão ...   Also watch the following videos here on the channel: BASIC MATHEMATICS:    • Matemática Básica   HIGH SCHOOL https://www.youtube.com/playlist?list... This video does not have advertising. Angela Pereira Correia - Professor Angela Mathematics