If Q=(a, b,c), how manysubsets can be obtained from the set Q

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x

The table shows the number of hours orlando spent at football practice last week. select the appropriate numbers below to complete the model to find the number of hours orlando spent practicing on tuesday and friday.

Based on the diagrams, what is the value of x?