2.12 x 10^4 is it scientific notation ?

I’m stuck on this question cuz i’m stupid sksksksk

Glands that the body deal with stress and respond to emergencies.

Look at the illustration of four letters from the american manual alphabet. decide whether the description of the letter is a good definition. if not, choose a counterexample. the letter i is formed by sticking up the smallest finger and folding all the other fingers into the palm of your hand with the thumb folded over them while keeping your hand still.