(2.1 *10^7) / (7 *10^4) solve in scientific notation

21,000,000 and 70,000

Step-by-step explanation:

move the decimal to the right (only if positive) based on the power. so for the first one I moved the decimal to the right 7 times

hope this helped:)

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.