After Kims half-marathon, her fitbit showed 23,580 steps, while Alex recorded 2.42×10⁴ steps after them same race. What's is the combined amount of their steps in scientific notation

What is the inverse of the function f(x)=4x+8

Me, prove a quadrilateral with vertices g(1,-1), h(5,1), i(4,3) and j(0,1) is a rectangle using the parallelogram method and a rectangle method.

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?