Avideo game designer is evaluating a new release and issues a pre-release version to a set of testers. the testers spend an average of 12 minutes to complete the first level, with a standard deviation of 3.5 minutes. assuming a normal distribution for the data, 84% of players should complete the first level in less than how many minutes?

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.

square root

step-by-step explanation: