Answer:
2 personal training sessions
Step-by-step explanation:
If a personal training sessions is $20, that is 1/2 of the $40 at the Silver Gym. That means if you multiply the $20 by 2, you get the value of the membership which is $40.
18 hours
D
51 * 2^x
51 * 2^0 = 51 * 1 = 51
51 * 2^1 = 51 * 2 = 102
51 * 2^2 = 51 * 5 = 204
...
