Please help asap due at 12

Which of the fallowing best completes the sequence 12,8,5, a) 1 b) 2 c)4 d)0

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm

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