After 12 years
3500 * 2 = 7000
after 24 years
7000 * 2 = 14000
14000 : 3500 = 4
so the answer is 24 years
Answer:
x = 3
Step-by-step explanation:

56 is not equal to 30
Answer:
y= 25x
Step-by-step explanation:
Answer:
6.8127 × 10^16
Step-by-step explanation:
Hope this helps:)