Algebra Math problem?
Modeling using exponential functions
1. There were 12 rats in a deli. in 2 months there were 48 rats in the deli. If the rat population continues to increase at this rate how many rats will be in the deli in 6 months?
2. A radioactive substance has a half life of 2 seconds. If you start with 1000 mg how much of the substance will be left after 20 seconds?
Comments
1. 12 rats
2 months = 36 new rats
1 month = 18 month
36 + 18 = 3 months
54 + 18 = 4 months
72 + 18 = 5 months
90 + 18 = 6 months
108 rats
2. 1000 after 2 seconds = 500
after 4 seconds = 250
after 6 seconds = 175
after 8 seconds = 87.5
after 10 seconds = 43.75
after 12 seconds = 21.875
after 14 seconds = 10.9375
after 16 seconds = 5.46875
after 18 seconds = 2.734375
after 20 seconds = 1.3671875
1. 2985984
i think that is the answer tell me if im wrong