Betty's height to jinlan's height

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

Jackson earns $25 per hour as a tutor at the college library. he set a weekly spending budget of $130 each week and puts the remaining money in his savings account. how many hours must he work this week to have at least an extra $50 to put in his savings account

3/8 of the students in ms. mull’s class ride the bus. if there are 24 students in the class, how many students ride the bus?