Eliza cannot decide which of two bicycles to buy. the original price of each is $380. the first is marked down by 50%. the second is marked
down by 30% with an additional 20% off. which bicycle should eliza buy if the bicycles are the same except for the selling price? explain your answer.

Eliza should buy the bike that is 50% off. Its sales cost is $190. The other bike has been marked down twice, but still costs $212.80.

Step-by-step explanation:

Bike 1 = 50% off of $380 = 380 x 0.5 = $190

Bike 2 = 30% off of $380 = 380 x .7 = $266

             20% off of $266 = 266 x .80 = $212.80

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 !