The difference between two numbers is 78. five times the smaller is equal to 6 more than the larger. what are the numbers?

Your friend swims on the school team. in his first four races, his times are 24.7, 23.5, 25.6, and 27.2 seconds. which time listed for his next race would make the range larger?

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Which is f(5) for the function –2x2 + 2x - 3?