Question

The approximate number of cell phones subscribers can be modeled by YC = 0.01(e^0.45x) x is the number of years since January 1980 and Yc is the number of subscribers in millions
When did the number of subscribers reach 60 million?

Answer 1

@phi help pls

Answer 2

60,000,000 = 0.01 exp(0.45 x)
6e7 = 1e-2 exp(0.45 x) (using scientific notation)
6e9 = exp(0.45 x)
ln(6e9) = 0.45 x
x = ln(6e9)/0.45

that gives x = 50.03
call it 50 years, so 1980+50 = 2030

Answer 3

ok gratzi

Answer 4

I have a 95 in math class and I got a 60 on a test grade. Test grades are 50% of your grade . Test average is 92