Could someone help me with a Calc1 Related Rates problem, please?

Question

jigglypuff314 · Answer

does this file work? :P

jigglypuff314 · Answer

The picture was a condensed from my notes, but I don't know how to do it.
the actual problem was along the lines of:
Bobby Teenager is walking away from a lamp post... the rate at which his shadow is changing is 1/3 the rate he is walking... the lamp post is 20ft high...
a) Explain how Bobby Teenager is 5ft tall.
b) Find the rate at which (theta) is changing when Bobby Teenager is 12ft away from the lamp post. and he is walking at a speed of 5 ft/min.

anonymous · Answer

Maybe you should just try asking your teacher

jigglypuff314 · Answer

I would if I could :P it's why I'm asking it on here :)

anonymous · Answer

Well just keep asking someone will help you :)