Please help me in math​

Monica build a remote control toy airplane for science project to test the plane she launched it from the top of a building the plane travel a horizontal distance of 50 feet before landing on the ground a quadratic function which models the height of the plane in feet relative to the ground at a horizontal distance of x feet from the building is shown

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Which expression is rational? 6. , square root two, square root 14, square root 49