Betty donahue is choosing between two fitness centers. center a charges $375 per year for unlimited use of all facilities. center b charges a $35 sign up fee, a $12 monthly fee, and $5 per aerobics class. if betty goes to aerobics once a week, which club is least expensive for her to use for a year

15% chance.

step-by-step explanation:

3/10 times, the 5 year old will get a tablet. 5/10 times, the 13 yer old will get a tablet. multiply both fractions to get 15/100 times, both would have a tablet.

answer:

at time x=0 we have 1000, at time x=1 we have 2000, at time x=2 we have 4000.  

so that's an initial value of 1000 and a ratio of 2,

y = 1000 (2^x)

hope this !