A would be 12. If your sister is 6 years older than your brother your brother is 4
if your brother is 1/3 your age 4 times 3 you are 12
The Burj Khalifa, a building in Dubai, United Arab Emirates, is about 828 meters tall. Brody is making a scale model of this building, using the scale 500 meters : 1 meter.
I drew saves $5 per week and Jan saves $6 per week, and they combine it together towards buying a video game they both wanted. They will end up saving $11 every week towards buying the game.
5+6=11.
Option A is correct.
If we evaluate the function at
, i.e. at the beginning, we have

with each minute, you multiply the current number of cell by 2, so they double every minute.
Option B is incorrect, because if the number of cells increases by 2 every minute, the function would be

Option C is incorrect, because after one minute (i.e. when x=1) we have

cells, so 75 is not the number of cells after one minute
Option D is incorrect in both the initial value and the behaviour of the function