Question

Cepheids can be used to calculate distance by:

adding absolute and apparent magnitude
finding the difference between absolute and apparent magnitude
measuring parallax angles
dividing radial velocity by distance

Cepheids:

brighten and dim periodically
can be used to measure stellar distance
have been discovered in galaxies other than our own
all of the above

Absolute magnitude _____.

is how bright a star appears from Earth
depends on luminosity and distance
is a measure of a star's actual brightness
is usually the same as apparent magnitude


PLEASE HELPPPPP!!!!!

Answer 1

For the first one the answer is "B"

The second one is "D"

The last one is "C"

Hope this helped!