What is the domain of this exponential function? y=7^x

Explain why the factor 1.5 is broke. into two numbers in the model.

Pepe and leo deposits money into their savings account at the end of the month the table shows the account balances. if there pattern of savings continue and neither earns interest nor withdraw any of the money , how will the balance compare after a very long time ?

If the tip varies directly with the number of guest which equation represents between the tip,t, and the number of guest,g?