Choose all that apply: a, b,c, d,and e
Can someone help me real quick plz and thanks

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

To solve the system of equations below, pedro isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 5y=10x {x^2+y^2=36

Having a hard time understanding this question (see attachment).