For each planet in the solar system, its year is the time it takes the planet to revolve around the center star. The formula E = 0.2x32 models the number of Earth days in a planet's year, E, where x is the average distance of the planet from the center star, in millions of kilometers. 1. There are approximately 88 Earth days in the year of the planet Mercury. What is the average distance of Mercury from the center star? Round to the nearest million kilometers. 2. Saturn averages 1.4 billion kilometers from the sun. Approximately how many Earth days are the year of the planet Saturn? Round to the nearest whole day. 3. The function x)-273x models the number of plant species, f(x), on an island in terms of the area, x, in square miles. 3. What is the area of an island that has 54 species of plants? 4. How many plant species would you expect to find on an island that has an area of 19 square miles? Round to the nearest whole number.

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c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

step-by-step explanation:

because 1/3 is a fraction. we can tell because there is a divisor symbol between the 1 and the 3. if we were to add 2 fractions together, we would add the numerators, which is the number on top, but not the denominators, which is the number on the bottom

1/3+1/3=2/3

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