What is thr pi numbers

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

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.

Aramp rises 4 feet over a distance of 10 feet. what is the length of the ramp?