Which of the following is important to do when planning an experiment? (1 point) Make sure that your friends will be there when you do the experiment.

Make sure that the experiment is safe to conduct.

Make sure that nobody else can copy the experiment.

Make sure that you don't know what the experiment is testing.

B

Step-by-step explanation:

Because none of the other answers make sense

Make sure that the experiment is safe to conduct.

Step-by-step explanation:

If it is noy safe do not conduct it because you could get hurt.

Hope this helps!

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.