Which two of the following equations could be solved by using quadratic formula ?

Brook states that the distance on the line is 4 units. caleb states that the whole line does not have a distance because it continues on forever. vivian states that the line is 6 units long. which distance did brook measure? which distance did vivian measure?

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

Having a hard time understanding this question (see attachment).