Find two numbers if their sum is six and their difference is 36

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

The train station clock runs too fast and gains 5 minutes every 10 days. how many minutes and seconds will it have gained at the end of 9 days?

Explain how you can use the associative property to evaluate (7x50)x4.