Write each number in scientific notation
6. 0.4 (21 zeros after the decimal place)

0.4x10'20

Step-by-step explanation:

for the scientific notation u need to move the decimal to make a small number.

0.0000000000000000000004 ---> 0.4

move the decimal 20 spaces to the right

(formula:(number times 10(expontent 'the moved spaces'))

0.4x10'20

(the 20 is the expontent)

good for u

step-by-step explanation:

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation: