What is 48,978 written in scientific notation? a.4.8978 x 10b.4.8978 x 10c.4.8978 x 10d.48.978 x 10

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

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take good notes.

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use mnemonics and other tricks.

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