Which property of equality would be used to solve 3x = 81? addition

If olu is twice as old as funmi if the sum of their ages is 60 how old is olu

What is the value of f(x) = 2.2 for f(-2)?

What sums are equal to 6/12? choose all answers that are correct a.6/12+6/12+6/12+6/12+6/12+6/12 b.2/12+1/12+1/12+2/12 c.5/12+1/12 d.1/12+1/12+1/12+3/12 plz : )