I need help with 2 questions on my high school physics homework. Hopefully all you T-geniuses out there can help.

First Problem: Mike is 12 meters from the bus and is running towards the bus at a constant 4.0 m/s. If the bus accelerates away from the bus stop at 0.8 m/s^2, can Mike catch the bus? If so, where?

Second Problem: Emily is on top of a 28 meter tall building. She drops a ball from rest at the instant that Joe throws a ball up from the ground at 18 m/s. Do the balls cross paths? If so, where do they cross?

When answering, please show all work.(equation, substitution, etc.)

Basically these are the only formulas we're allowed to use:

Vf=Vi+at

D=Vit + 1/2at^2

Vf^2=Vi^2+2ad

V=d/t

a=v/t

Where Vf is final velocity. Vi is initial velocity. a is acceleration. t is time. D is distance. V is velocity.

Thanks in advance