Each day, Steven walked 1/12 mile more than the previous day. The first day he walked 1/12, the second day he walked 2/12 mile, the third day he walked 3/12 mile. On which day did the sum of his walks total at least 1 complete mile?

12th day

Step-by-step explanation:

First day:  1/12 mile:  note the '1' in '1/12.'

Second day:  2/12 mile

Third day:  3/12 mile

One complete mile would therefore be 12/12 mile, achieved on the 12th day.

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.