Question

add then simplify.by collecting like radical terms if possible assuming that all expressions under radicals represent non negative numbers:
√5a + 2√45a^3
Suppose that the volumes of four stars in the Milky Way are 2.7 × 1018 km3, 6.9 × 1012 km3, 2.2 × 1012 km3, and 4.9 × 1021 km3. What is the order of the stars from least to greatest volume?

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