Can anyone solve the his it’s pretty easy but I really don’t feel like doing anything today lol

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

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?

How are algebraic expressions evaluated using substitution?