How do I do this and what is the answer

What is r i 4.5+10r=-6.5 with work pls

Jeremy wants to determine the number of solutions for the equation below without actually solving the equation. which method should jeremy use?

Consider a= {x|x is alive} f={x|x is in france} m={x|x is a national monument} w{x|x is a woman}. which statements are true regarding elements of the given sets? check all that apply.