The population of cuba is 1.3million the country's population is expected to grow at a rate of 4% each year the population of cuba will be in 10 years

The  population in Cuba is expected to grow at a rate of 4% each year . Now is 
1.3million .
This means that after 1 year the population in Cuba would be: 1.3 million+ 4%*1.3million=1.300.000+52.000=1.352.000
After the second year the population would be: 1.352.000  + 4% of 1.352.000=...
After n years the population would be: population in the n-1 th year  + 4% (population in the year n-1)
In 10 years the population in Cuba would be: population in the 9-th year +4% from the population in the 9-th year

I’m not absolutely sure but i think it’s 7x6x5x4x3x2=5040 because as the first character you can take any of the 7 given then you are left with 5 then 6 then 4 etc.

a - base

b - exponent

so,

the base is 8the exponent is 3the exponent tells you to multiply 8 together three timesthe expanded form is 8*8*8