Please help me with this problem, thanks

Which of these is and example of a literal equation? a) 6+30=6^2 b)3x-4y c)12=9+3x d)ax-by=k

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

What are the digits that repeat in the smallest sequence of repeating digits in the decimal equivalent of 24/11?